1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011,2012,2013 Marc Alexander Lehmann <[email protected]>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 /* this big block deduces configuration from config.h */
41 #ifndef EV_STANDALONE
42 # ifdef EV_CONFIG_H
43 # include EV_CONFIG_H
44 # else
45 # include "config.h"
46 # endif
47
48 # if HAVE_FLOOR
49 # ifndef EV_USE_FLOOR
50 # define EV_USE_FLOOR 1
51 # endif
52 # endif
53
54 # if HAVE_CLOCK_SYSCALL
55 # ifndef EV_USE_CLOCK_SYSCALL
56 # define EV_USE_CLOCK_SYSCALL 1
57 # ifndef EV_USE_REALTIME
58 # define EV_USE_REALTIME 0
59 # endif
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 1
62 # endif
63 # endif
64 # elif !defined EV_USE_CLOCK_SYSCALL
65 # define EV_USE_CLOCK_SYSCALL 0
66 # endif
67
68 # if HAVE_CLOCK_GETTIME
69 # ifndef EV_USE_MONOTONIC
70 # define EV_USE_MONOTONIC 1
71 # endif
72 # ifndef EV_USE_REALTIME
73 # define EV_USE_REALTIME 0
74 # endif
75 # else
76 # ifndef EV_USE_MONOTONIC
77 # define EV_USE_MONOTONIC 0
78 # endif
79 # ifndef EV_USE_REALTIME
80 # define EV_USE_REALTIME 0
81 # endif
82 # endif
83
84 # if HAVE_NANOSLEEP
85 # ifndef EV_USE_NANOSLEEP
86 # define EV_USE_NANOSLEEP EV_FEATURE_OS
87 # endif
88 # else
89 # undef EV_USE_NANOSLEEP
90 # define EV_USE_NANOSLEEP 0
91 # endif
92
93 # if HAVE_SELECT && HAVE_SYS_SELECT_H
94 # ifndef EV_USE_SELECT
95 # define EV_USE_SELECT EV_FEATURE_BACKENDS
96 # endif
97 # else
98 # undef EV_USE_SELECT
99 # define EV_USE_SELECT 0
100 # endif
101
102 # if HAVE_POLL && HAVE_POLL_H
103 # ifndef EV_USE_POLL
104 # define EV_USE_POLL EV_FEATURE_BACKENDS
105 # endif
106 # else
107 # undef EV_USE_POLL
108 # define EV_USE_POLL 0
109 # endif
110
111 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112 # ifndef EV_USE_EPOLL
113 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
114 # endif
115 # else
116 # undef EV_USE_EPOLL
117 # define EV_USE_EPOLL 0
118 # endif
119
120 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121 # ifndef EV_USE_KQUEUE
122 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
123 # endif
124 # else
125 # undef EV_USE_KQUEUE
126 # define EV_USE_KQUEUE 0
127 # endif
128
129 # if HAVE_PORT_H && HAVE_PORT_CREATE
130 # ifndef EV_USE_PORT
131 # define EV_USE_PORT EV_FEATURE_BACKENDS
132 # endif
133 # else
134 # undef EV_USE_PORT
135 # define EV_USE_PORT 0
136 # endif
137
138 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139 # ifndef EV_USE_INOTIFY
140 # define EV_USE_INOTIFY EV_FEATURE_OS
141 # endif
142 # else
143 # undef EV_USE_INOTIFY
144 # define EV_USE_INOTIFY 0
145 # endif
146
147 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148 # ifndef EV_USE_SIGNALFD
149 # define EV_USE_SIGNALFD EV_FEATURE_OS
150 # endif
151 # else
152 # undef EV_USE_SIGNALFD
153 # define EV_USE_SIGNALFD 0
154 # endif
155
156 # if HAVE_EVENTFD
157 # ifndef EV_USE_EVENTFD
158 # define EV_USE_EVENTFD EV_FEATURE_OS
159 # endif
160 # else
161 # undef EV_USE_EVENTFD
162 # define EV_USE_EVENTFD 0
163 # endif
164
165 #endif
166
167 #include <stdlib.h>
168 #include <string.h>
169 #include <fcntl.h>
170 #include <stddef.h>
171
172 #include <stdio.h>
173
174 #include <assert.h>
175 #include <errno.h>
176 #include <sys/types.h>
177 #include <time.h>
178 #include <limits.h>
179
180 #include <signal.h>
181
182 #ifdef EV_H
183 # include EV_H
184 #else
185 # include "ev.h"
186 #endif
187
188 #if EV_NO_THREADS
189 # undef EV_NO_SMP
190 # define EV_NO_SMP 1
191 # undef ECB_NO_THREADS
192 # define ECB_NO_THREADS 1
193 #endif
194 #if EV_NO_SMP
195 # undef EV_NO_SMP
196 # define ECB_NO_SMP 1
197 #endif
198
199 #ifndef _WIN32
200 # include <sys/time.h>
201 # include <sys/wait.h>
202 # include <unistd.h>
203 #else
204 # include <io.h>
205 # define WIN32_LEAN_AND_MEAN
206 # include <winsock2.h>
207 # include <windows.h>
208 # ifndef EV_SELECT_IS_WINSOCKET
209 # define EV_SELECT_IS_WINSOCKET 1
210 # endif
211 # undef EV_AVOID_STDIO
212 #endif
213
214 /* OS X, in its infinite idiocy, actually HARDCODES
215 * a limit of 1024 into their select. Where people have brains,
216 * OS X engineers apparently have a vacuum. Or maybe they were
217 * ordered to have a vacuum, or they do anything for money.
218 * This might help. Or not.
219 */
220 #define _DARWIN_UNLIMITED_SELECT 1
221
222 /* this block tries to deduce configuration from header-defined symbols and defaults */
223
224 /* try to deduce the maximum number of signals on this platform */
225 #if defined EV_NSIG
226 /* use what's provided */
227 #elif defined NSIG
228 # define EV_NSIG (NSIG)
229 #elif defined _NSIG
230 # define EV_NSIG (_NSIG)
231 #elif defined SIGMAX
232 # define EV_NSIG (SIGMAX+1)
233 #elif defined SIG_MAX
234 # define EV_NSIG (SIG_MAX+1)
235 #elif defined _SIG_MAX
236 # define EV_NSIG (_SIG_MAX+1)
237 #elif defined MAXSIG
238 # define EV_NSIG (MAXSIG+1)
239 #elif defined MAX_SIG
240 # define EV_NSIG (MAX_SIG+1)
241 #elif defined SIGARRAYSIZE
242 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
243 #elif defined _sys_nsig
244 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
245 #else
246 # define EV_NSIG (8 * sizeof (sigset_t) + 1)
247 #endif
248
249 #ifndef EV_USE_FLOOR
250 # define EV_USE_FLOOR 0
251 #endif
252
253 #ifndef EV_USE_CLOCK_SYSCALL
254 # if __linux && __GLIBC__ == 2 && __GLIBC_MINOR__ < 17
255 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
256 # else
257 # define EV_USE_CLOCK_SYSCALL 0
258 # endif
259 #endif
260
261 #if !(_POSIX_TIMERS > 0)
262 # ifndef EV_USE_MONOTONIC
263 # define EV_USE_MONOTONIC 0
264 # endif
265 # ifndef EV_USE_REALTIME
266 # define EV_USE_REALTIME 0
267 # endif
268 #endif
269
270 #ifndef EV_USE_MONOTONIC
271 # if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
272 # define EV_USE_MONOTONIC EV_FEATURE_OS
273 # else
274 # define EV_USE_MONOTONIC 0
275 # endif
276 #endif
277
278 #ifndef EV_USE_REALTIME
279 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
280 #endif
281
282 #ifndef EV_USE_NANOSLEEP
283 # if _POSIX_C_SOURCE >= 199309L
284 # define EV_USE_NANOSLEEP EV_FEATURE_OS
285 # else
286 # define EV_USE_NANOSLEEP 0
287 # endif
288 #endif
289
290 #ifndef EV_USE_SELECT
291 # define EV_USE_SELECT EV_FEATURE_BACKENDS
292 #endif
293
294 #ifndef EV_USE_POLL
295 # ifdef _WIN32
296 # define EV_USE_POLL 0
297 # else
298 # define EV_USE_POLL EV_FEATURE_BACKENDS
299 # endif
300 #endif
301
302 #ifndef EV_USE_EPOLL
303 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
304 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
305 # else
306 # define EV_USE_EPOLL 0
307 # endif
308 #endif
309
310 #ifndef EV_USE_KQUEUE
311 # define EV_USE_KQUEUE 0
312 #endif
313
314 #ifndef EV_USE_PORT
315 # define EV_USE_PORT 0
316 #endif
317
318 #ifndef EV_USE_INOTIFY
319 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
320 # define EV_USE_INOTIFY EV_FEATURE_OS
321 # else
322 # define EV_USE_INOTIFY 0
323 # endif
324 #endif
325
326 #ifndef EV_PID_HASHSIZE
327 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
328 #endif
329
330 #ifndef EV_INOTIFY_HASHSIZE
331 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
332 #endif
333
334 #ifndef EV_USE_EVENTFD
335 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
336 # define EV_USE_EVENTFD EV_FEATURE_OS
337 # else
338 # define EV_USE_EVENTFD 0
339 # endif
340 #endif
341
342 #ifndef EV_USE_SIGNALFD
343 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
344 # define EV_USE_SIGNALFD EV_FEATURE_OS
345 # else
346 # define EV_USE_SIGNALFD 0
347 # endif
348 #endif
349
350 #if 0 /* debugging */
351 # define EV_VERIFY 3
352 # define EV_USE_4HEAP 1
353 # define EV_HEAP_CACHE_AT 1
354 #endif
355
356 #ifndef EV_VERIFY
357 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
358 #endif
359
360 #ifndef EV_USE_4HEAP
361 # define EV_USE_4HEAP EV_FEATURE_DATA
362 #endif
363
364 #ifndef EV_HEAP_CACHE_AT
365 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
366 #endif
367
368 #ifdef ANDROID
369 /* supposedly, android doesn't typedef fd_mask */
370 # undef EV_USE_SELECT
371 # define EV_USE_SELECT 0
372 /* supposedly, we need to include syscall.h, not sys/syscall.h, so just disable */
373 # undef EV_USE_CLOCK_SYSCALL
374 # define EV_USE_CLOCK_SYSCALL 0
375 #endif
376
377 /* aix's poll.h seems to cause lots of trouble */
378 #ifdef _AIX
379 /* AIX has a completely broken poll.h header */
380 # undef EV_USE_POLL
381 # define EV_USE_POLL 0
382 #endif
383
384 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
385 /* which makes programs even slower. might work on other unices, too. */
386 #if EV_USE_CLOCK_SYSCALL
387 # include <sys/syscall.h>
388 # ifdef SYS_clock_gettime
389 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
390 # undef EV_USE_MONOTONIC
391 # define EV_USE_MONOTONIC 1
392 # else
393 # undef EV_USE_CLOCK_SYSCALL
394 # define EV_USE_CLOCK_SYSCALL 0
395 # endif
396 #endif
397
398 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
399
400 #ifndef CLOCK_MONOTONIC
401 # undef EV_USE_MONOTONIC
402 # define EV_USE_MONOTONIC 0
403 #endif
404
405 #ifndef CLOCK_REALTIME
406 # undef EV_USE_REALTIME
407 # define EV_USE_REALTIME 0
408 #endif
409
410 #if !EV_STAT_ENABLE
411 # undef EV_USE_INOTIFY
412 # define EV_USE_INOTIFY 0
413 #endif
414
415 #if !EV_USE_NANOSLEEP
416 /* hp-ux has it in sys/time.h, which we unconditionally include above */
417 # if !defined _WIN32 && !defined __hpux
418 # include <sys/select.h>
419 # endif
420 #endif
421
422 #if EV_USE_INOTIFY
423 # include <sys/statfs.h>
424 # include <sys/inotify.h>
425 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
426 # ifndef IN_DONT_FOLLOW
427 # undef EV_USE_INOTIFY
428 # define EV_USE_INOTIFY 0
429 # endif
430 #endif
431
432 #if EV_USE_EVENTFD
433 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
434 # include <stdint.h>
435 # ifndef EFD_NONBLOCK
436 # define EFD_NONBLOCK O_NONBLOCK
437 # endif
438 # ifndef EFD_CLOEXEC
439 # ifdef O_CLOEXEC
440 # define EFD_CLOEXEC O_CLOEXEC
441 # else
442 # define EFD_CLOEXEC 02000000
443 # endif
444 # endif
445 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
446 #endif
447
448 #if EV_USE_SIGNALFD
449 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
450 # include <stdint.h>
451 # ifndef SFD_NONBLOCK
452 # define SFD_NONBLOCK O_NONBLOCK
453 # endif
454 # ifndef SFD_CLOEXEC
455 # ifdef O_CLOEXEC
456 # define SFD_CLOEXEC O_CLOEXEC
457 # else
458 # define SFD_CLOEXEC 02000000
459 # endif
460 # endif
461 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
462
463 struct signalfd_siginfo
464 {
465 uint32_t ssi_signo;
466 char pad[128 - sizeof (uint32_t)];
467 };
468 #endif
469
470 /**/
471
472 #if EV_VERIFY >= 3
473 # define EV_FREQUENT_CHECK ev_verify (EV_A)
474 #else
475 # define EV_FREQUENT_CHECK do { } while (0)
476 #endif
477
478 /*
479 * This is used to work around floating point rounding problems.
480 * This value is good at least till the year 4000.
481 */
482 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
483 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
484
485 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
486 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
487
488 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
489 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
490
491 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
492 /* ECB.H BEGIN */
493 /*
494 * libecb - http://software.schmorp.de/pkg/libecb
495 *
496 * Copyright (©) 2009-2015 Marc Alexander Lehmann <[email protected]>
497 * Copyright (©) 2011 Emanuele Giaquinta
498 * All rights reserved.
499 *
500 * Redistribution and use in source and binary forms, with or without modifica-
501 * tion, are permitted provided that the following conditions are met:
502 *
503 * 1. Redistributions of source code must retain the above copyright notice,
504 * this list of conditions and the following disclaimer.
505 *
506 * 2. Redistributions in binary form must reproduce the above copyright
507 * notice, this list of conditions and the following disclaimer in the
508 * documentation and/or other materials provided with the distribution.
509 *
510 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
511 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
512 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
513 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
514 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
515 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
516 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
517 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
518 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
519 * OF THE POSSIBILITY OF SUCH DAMAGE.
520 *
521 * Alternatively, the contents of this file may be used under the terms of
522 * the GNU General Public License ("GPL") version 2 or any later version,
523 * in which case the provisions of the GPL are applicable instead of
524 * the above. If you wish to allow the use of your version of this file
525 * only under the terms of the GPL and not to allow others to use your
526 * version of this file under the BSD license, indicate your decision
527 * by deleting the provisions above and replace them with the notice
528 * and other provisions required by the GPL. If you do not delete the
529 * provisions above, a recipient may use your version of this file under
530 * either the BSD or the GPL.
531 */
532
533 #ifndef ECB_H
534 #define ECB_H
535
536 /* 16 bits major, 16 bits minor */
537 #define ECB_VERSION 0x00010005
538
539 #ifdef _WIN32
540 typedef signed char int8_t;
541 typedef unsigned char uint8_t;
542 typedef signed short int16_t;
543 typedef unsigned short uint16_t;
544 typedef signed int int32_t;
545 typedef unsigned int uint32_t;
546 #if __GNUC__
547 typedef signed long long int64_t;
548 typedef unsigned long long uint64_t;
549 #else /* _MSC_VER || __BORLANDC__ */
550 typedef signed __int64 int64_t;
551 typedef unsigned __int64 uint64_t;
552 #endif
553 #ifdef _WIN64
554 #define ECB_PTRSIZE 8
555 typedef uint64_t uintptr_t;
556 typedef int64_t intptr_t;
557 #else
558 #define ECB_PTRSIZE 4
559 typedef uint32_t uintptr_t;
560 typedef int32_t intptr_t;
561 #endif
562 #else
563 #include <inttypes.h>
564 #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
565 #define ECB_PTRSIZE 8
566 #else
567 #define ECB_PTRSIZE 4
568 #endif
569 #endif
570
571 #define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
572 #define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
573
574 /* work around x32 idiocy by defining proper macros */
575 #if ECB_GCC_AMD64 || ECB_MSVC_AMD64
576 #if _ILP32
577 #define ECB_AMD64_X32 1
578 #else
579 #define ECB_AMD64 1
580 #endif
581 #endif
582
583 /* many compilers define _GNUC_ to some versions but then only implement
584 * what their idiot authors think are the "more important" extensions,
585 * causing enormous grief in return for some better fake benchmark numbers.
586 * or so.
587 * we try to detect these and simply assume they are not gcc - if they have
588 * an issue with that they should have done it right in the first place.
589 */
590 #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
591 #define ECB_GCC_VERSION(major,minor) 0
592 #else
593 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
594 #endif
595
596 #define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
597
598 #if __clang__ && defined __has_builtin
599 #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
600 #else
601 #define ECB_CLANG_BUILTIN(x) 0
602 #endif
603
604 #if __clang__ && defined __has_extension
605 #define ECB_CLANG_EXTENSION(x) __has_extension (x)
606 #else
607 #define ECB_CLANG_EXTENSION(x) 0
608 #endif
609
610 #define ECB_CPP (__cplusplus+0)
611 #define ECB_CPP11 (__cplusplus >= 201103L)
612
613 #if ECB_CPP
614 #define ECB_C 0
615 #define ECB_STDC_VERSION 0
616 #else
617 #define ECB_C 1
618 #define ECB_STDC_VERSION __STDC_VERSION__
619 #endif
620
621 #define ECB_C99 (ECB_STDC_VERSION >= 199901L)
622 #define ECB_C11 (ECB_STDC_VERSION >= 201112L)
623
624 #if ECB_CPP
625 #define ECB_EXTERN_C extern "C"
626 #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
627 #define ECB_EXTERN_C_END }
628 #else
629 #define ECB_EXTERN_C extern
630 #define ECB_EXTERN_C_BEG
631 #define ECB_EXTERN_C_END
632 #endif
633
634 /*****************************************************************************/
635
636 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
637 /* ECB_NO_SMP - ecb might be used in multiple threads, but only on a single cpu */
638
639 #if ECB_NO_THREADS
640 #define ECB_NO_SMP 1
641 #endif
642
643 #if ECB_NO_SMP
644 #define ECB_MEMORY_FENCE do { } while (0)
645 #endif
646
647 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
648 #if __xlC__ && ECB_CPP
649 #include <builtins.h>
650 #endif
651
652 #if 1400 <= _MSC_VER
653 #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
654 #endif
655
656 #ifndef ECB_MEMORY_FENCE
657 #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
658 #if __i386 || __i386__
659 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
660 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
661 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
662 #elif ECB_GCC_AMD64
663 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mfence" : : : "memory")
664 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("" : : : "memory")
665 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
666 #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
667 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory")
668 #elif defined __ARM_ARCH_2__ \
669 || defined __ARM_ARCH_3__ || defined __ARM_ARCH_3M__ \
670 || defined __ARM_ARCH_4__ || defined __ARM_ARCH_4T__ \
671 || defined __ARM_ARCH_5__ || defined __ARM_ARCH_5E__ \
672 || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
673 || defined __ARM_ARCH_5TEJ__
674 /* should not need any, unless running old code on newer cpu - arm doesn't support that */
675 #elif defined __ARM_ARCH_6__ || defined __ARM_ARCH_6J__ \
676 || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
677 || defined __ARM_ARCH_6T2__
678 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
679 #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \
680 || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
681 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory")
682 #elif __aarch64__
683 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb ish" : : : "memory")
684 #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
685 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
686 #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory")
687 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore")
688 #elif defined __s390__ || defined __s390x__
689 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory")
690 #elif defined __mips__
691 /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
692 /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
693 #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
694 #elif defined __alpha__
695 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory")
696 #elif defined __hppa__
697 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
698 #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
699 #elif defined __ia64__
700 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory")
701 #elif defined __m68k__
702 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
703 #elif defined __m88k__
704 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
705 #elif defined __sh__
706 #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory")
707 #endif
708 #endif
709 #endif
710
711 #ifndef ECB_MEMORY_FENCE
712 #if ECB_GCC_VERSION(4,7)
713 /* see comment below (stdatomic.h) about the C11 memory model. */
714 #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST)
715 #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
716 #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
717
718 #elif ECB_CLANG_EXTENSION(c_atomic)
719 /* see comment below (stdatomic.h) about the C11 memory model. */
720 #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
721 #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
722 #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
723
724 #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
725 #define ECB_MEMORY_FENCE __sync_synchronize ()
726 #elif _MSC_VER >= 1500 /* VC++ 2008 */
727 /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
728 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
729 #define ECB_MEMORY_FENCE _ReadWriteBarrier (); MemoryBarrier()
730 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
731 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
732 #elif _MSC_VER >= 1400 /* VC++ 2005 */
733 #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
734 #define ECB_MEMORY_FENCE _ReadWriteBarrier ()
735 #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
736 #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
737 #elif defined _WIN32
738 #include <WinNT.h>
739 #define ECB_MEMORY_FENCE MemoryBarrier () /* actually just xchg on x86... scary */
740 #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
741 #include <mbarrier.h>
742 #define ECB_MEMORY_FENCE __machine_rw_barrier ()
743 #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier ()
744 #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier ()
745 #elif __xlC__
746 #define ECB_MEMORY_FENCE __sync ()
747 #endif
748 #endif
749
750 #ifndef ECB_MEMORY_FENCE
751 #if ECB_C11 && !defined __STDC_NO_ATOMICS__
752 /* we assume that these memory fences work on all variables/all memory accesses, */
753 /* not just C11 atomics and atomic accesses */
754 #include <stdatomic.h>
755 /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
756 /* any fence other than seq_cst, which isn't very efficient for us. */
757 /* Why that is, we don't know - either the C11 memory model is quite useless */
758 /* for most usages, or gcc and clang have a bug */
759 /* I *currently* lean towards the latter, and inefficiently implement */
760 /* all three of ecb's fences as a seq_cst fence */
761 /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
762 /* for all __atomic_thread_fence's except seq_cst */
763 #define ECB_MEMORY_FENCE atomic_thread_fence (memory_order_seq_cst)
764 #endif
765 #endif
766
767 #ifndef ECB_MEMORY_FENCE
768 #if !ECB_AVOID_PTHREADS
769 /*
770 * if you get undefined symbol references to pthread_mutex_lock,
771 * or failure to find pthread.h, then you should implement
772 * the ECB_MEMORY_FENCE operations for your cpu/compiler
773 * OR provide pthread.h and link against the posix thread library
774 * of your system.
775 */
776 #include <pthread.h>
777 #define ECB_NEEDS_PTHREADS 1
778 #define ECB_MEMORY_FENCE_NEEDS_PTHREADS 1
779
780 static pthread_mutex_t ecb_mf_lock = PTHREAD_MUTEX_INITIALIZER;
781 #define ECB_MEMORY_FENCE do { pthread_mutex_lock (&ecb_mf_lock); pthread_mutex_unlock (&ecb_mf_lock); } while (0)
782 #endif
783 #endif
784
785 #if !defined ECB_MEMORY_FENCE_ACQUIRE && defined ECB_MEMORY_FENCE
786 #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
787 #endif
788
789 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
790 #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
791 #endif
792
793 /*****************************************************************************/
794
795 #if ECB_CPP
796 #define ecb_inline static inline
797 #elif ECB_GCC_VERSION(2,5)
798 #define ecb_inline static __inline__
799 #elif ECB_C99
800 #define ecb_inline static inline
801 #else
802 #define ecb_inline static
803 #endif
804
805 #if ECB_GCC_VERSION(3,3)
806 #define ecb_restrict __restrict__
807 #elif ECB_C99
808 #define ecb_restrict restrict
809 #else
810 #define ecb_restrict
811 #endif
812
813 typedef int ecb_bool;
814
815 #define ECB_CONCAT_(a, b) a ## b
816 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
817 #define ECB_STRINGIFY_(a) # a
818 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
819 #define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
820
821 #define ecb_function_ ecb_inline
822
823 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
824 #define ecb_attribute(attrlist) __attribute__ (attrlist)
825 #else
826 #define ecb_attribute(attrlist)
827 #endif
828
829 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
830 #define ecb_is_constant(expr) __builtin_constant_p (expr)
831 #else
832 /* possible C11 impl for integral types
833 typedef struct ecb_is_constant_struct ecb_is_constant_struct;
834 #define ecb_is_constant(expr) _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
835
836 #define ecb_is_constant(expr) 0
837 #endif
838
839 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
840 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
841 #else
842 #define ecb_expect(expr,value) (expr)
843 #endif
844
845 #if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
846 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
847 #else
848 #define ecb_prefetch(addr,rw,locality)
849 #endif
850
851 /* no emulation for ecb_decltype */
852 #if ECB_CPP11
853 // older implementations might have problems with decltype(x)::type, work around it
854 template<class T> struct ecb_decltype_t { typedef T type; };
855 #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
856 #elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
857 #define ecb_decltype(x) __typeof__ (x)
858 #endif
859
860 #if _MSC_VER >= 1300
861 #define ecb_deprecated __declspec (deprecated)
862 #else
863 #define ecb_deprecated ecb_attribute ((__deprecated__))
864 #endif
865
866 #if _MSC_VER >= 1500
867 #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
868 #elif ECB_GCC_VERSION(4,5)
869 #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
870 #else
871 #define ecb_deprecated_message(msg) ecb_deprecated
872 #endif
873
874 #if _MSC_VER >= 1400
875 #define ecb_noinline __declspec (noinline)
876 #else
877 #define ecb_noinline ecb_attribute ((__noinline__))
878 #endif
879
880 #define ecb_unused ecb_attribute ((__unused__))
881 #define ecb_const ecb_attribute ((__const__))
882 #define ecb_pure ecb_attribute ((__pure__))
883
884 #if ECB_C11 || __IBMC_NORETURN
885 /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
886 #define ecb_noreturn _Noreturn
887 #elif ECB_CPP11
888 #define ecb_noreturn [[noreturn]]
889 #elif _MSC_VER >= 1200
890 /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
891 #define ecb_noreturn __declspec (noreturn)
892 #else
893 #define ecb_noreturn ecb_attribute ((__noreturn__))
894 #endif
895
896 #if ECB_GCC_VERSION(4,3)
897 #define ecb_artificial ecb_attribute ((__artificial__))
898 #define ecb_hot ecb_attribute ((__hot__))
899 #define ecb_cold ecb_attribute ((__cold__))
900 #else
901 #define ecb_artificial
902 #define ecb_hot
903 #define ecb_cold
904 #endif
905
906 /* put around conditional expressions if you are very sure that the */
907 /* expression is mostly true or mostly false. note that these return */
908 /* booleans, not the expression. */
909 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
910 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
911 /* for compatibility to the rest of the world */
912 #define ecb_likely(expr) ecb_expect_true (expr)
913 #define ecb_unlikely(expr) ecb_expect_false (expr)
914
915 /* count trailing zero bits and count # of one bits */
916 #if ECB_GCC_VERSION(3,4) \
917 || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
918 && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
919 && ECB_CLANG_BUILTIN(__builtin_popcount))
920 /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
921 #define ecb_ld32(x) (__builtin_clz (x) ^ 31)
922 #define ecb_ld64(x) (__builtin_clzll (x) ^ 63)
923 #define ecb_ctz32(x) __builtin_ctz (x)
924 #define ecb_ctz64(x) __builtin_ctzll (x)
925 #define ecb_popcount32(x) __builtin_popcount (x)
926 /* no popcountll */
927 #else
928 ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
929 ecb_function_ ecb_const int
ecb_ctz32(uint32_t x)930 ecb_ctz32 (uint32_t x)
931 {
932 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
933 unsigned long r;
934 _BitScanForward (&r, x);
935 return (int)r;
936 #else
937 int r = 0;
938
939 x &= ~x + 1; /* this isolates the lowest bit */
940
941 #if ECB_branchless_on_i386
942 r += !!(x & 0xaaaaaaaa) << 0;
943 r += !!(x & 0xcccccccc) << 1;
944 r += !!(x & 0xf0f0f0f0) << 2;
945 r += !!(x & 0xff00ff00) << 3;
946 r += !!(x & 0xffff0000) << 4;
947 #else
948 if (x & 0xaaaaaaaa) r += 1;
949 if (x & 0xcccccccc) r += 2;
950 if (x & 0xf0f0f0f0) r += 4;
951 if (x & 0xff00ff00) r += 8;
952 if (x & 0xffff0000) r += 16;
953 #endif
954
955 return r;
956 #endif
957 }
958
959 ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
960 ecb_function_ ecb_const int
ecb_ctz64(uint64_t x)961 ecb_ctz64 (uint64_t x)
962 {
963 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
964 unsigned long r;
965 _BitScanForward64 (&r, x);
966 return (int)r;
967 #else
968 int shift = x & 0xffffffff ? 0 : 32;
969 return ecb_ctz32 (x >> shift) + shift;
970 #endif
971 }
972
973 ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
974 ecb_function_ ecb_const int
ecb_popcount32(uint32_t x)975 ecb_popcount32 (uint32_t x)
976 {
977 x -= (x >> 1) & 0x55555555;
978 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
979 x = ((x >> 4) + x) & 0x0f0f0f0f;
980 x *= 0x01010101;
981
982 return x >> 24;
983 }
984
985 ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
ecb_ld32(uint32_t x)986 ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
987 {
988 #if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
989 unsigned long r;
990 _BitScanReverse (&r, x);
991 return (int)r;
992 #else
993 int r = 0;
994
995 if (x >> 16) { x >>= 16; r += 16; }
996 if (x >> 8) { x >>= 8; r += 8; }
997 if (x >> 4) { x >>= 4; r += 4; }
998 if (x >> 2) { x >>= 2; r += 2; }
999 if (x >> 1) { r += 1; }
1000
1001 return r;
1002 #endif
1003 }
1004
1005 ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
ecb_ld64(uint64_t x)1006 ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
1007 {
1008 #if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
1009 unsigned long r;
1010 _BitScanReverse64 (&r, x);
1011 return (int)r;
1012 #else
1013 int r = 0;
1014
1015 if (x >> 32) { x >>= 32; r += 32; }
1016
1017 return r + ecb_ld32 (x);
1018 #endif
1019 }
1020 #endif
1021
1022 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
ecb_is_pot32(uint32_t x)1023 ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
1024 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
ecb_is_pot64(uint64_t x)1025 ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
1026
1027 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x);
ecb_bitrev8(uint8_t x)1028 ecb_function_ ecb_const uint8_t ecb_bitrev8 (uint8_t x)
1029 {
1030 return ( (x * 0x0802U & 0x22110U)
1031 | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
1032 }
1033
1034 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
ecb_bitrev16(uint16_t x)1035 ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
1036 {
1037 x = ((x >> 1) & 0x5555) | ((x & 0x5555) << 1);
1038 x = ((x >> 2) & 0x3333) | ((x & 0x3333) << 2);
1039 x = ((x >> 4) & 0x0f0f) | ((x & 0x0f0f) << 4);
1040 x = ( x >> 8 ) | ( x << 8);
1041
1042 return x;
1043 }
1044
1045 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
ecb_bitrev32(uint32_t x)1046 ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
1047 {
1048 x = ((x >> 1) & 0x55555555) | ((x & 0x55555555) << 1);
1049 x = ((x >> 2) & 0x33333333) | ((x & 0x33333333) << 2);
1050 x = ((x >> 4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) << 4);
1051 x = ((x >> 8) & 0x00ff00ff) | ((x & 0x00ff00ff) << 8);
1052 x = ( x >> 16 ) | ( x << 16);
1053
1054 return x;
1055 }
1056
1057 /* popcount64 is only available on 64 bit cpus as gcc builtin */
1058 /* so for this version we are lazy */
1059 ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
1060 ecb_function_ ecb_const int
ecb_popcount64(uint64_t x)1061 ecb_popcount64 (uint64_t x)
1062 {
1063 return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
1064 }
1065
1066 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count);
1067 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count);
1068 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
1069 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
1070 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
1071 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
1072 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
1073 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
1074
ecb_rotl8(uint8_t x,unsigned int count)1075 ecb_inline ecb_const uint8_t ecb_rotl8 (uint8_t x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
ecb_rotr8(uint8_t x,unsigned int count)1076 ecb_inline ecb_const uint8_t ecb_rotr8 (uint8_t x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
ecb_rotl16(uint16_t x,unsigned int count)1077 ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
ecb_rotr16(uint16_t x,unsigned int count)1078 ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
ecb_rotl32(uint32_t x,unsigned int count)1079 ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
ecb_rotr32(uint32_t x,unsigned int count)1080 ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
ecb_rotl64(uint64_t x,unsigned int count)1081 ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
ecb_rotr64(uint64_t x,unsigned int count)1082 ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
1083
1084 #if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
1085 #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
1086 #define ecb_bswap16(x) __builtin_bswap16 (x)
1087 #else
1088 #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
1089 #endif
1090 #define ecb_bswap32(x) __builtin_bswap32 (x)
1091 #define ecb_bswap64(x) __builtin_bswap64 (x)
1092 #elif _MSC_VER
1093 #include <stdlib.h>
1094 #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
1095 #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong ((uint32_t)(x)))
1096 #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
1097 #else
1098 ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
1099 ecb_function_ ecb_const uint16_t
ecb_bswap16(uint16_t x)1100 ecb_bswap16 (uint16_t x)
1101 {
1102 return ecb_rotl16 (x, 8);
1103 }
1104
1105 ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
1106 ecb_function_ ecb_const uint32_t
ecb_bswap32(uint32_t x)1107 ecb_bswap32 (uint32_t x)
1108 {
1109 return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
1110 }
1111
1112 ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
1113 ecb_function_ ecb_const uint64_t
ecb_bswap64(uint64_t x)1114 ecb_bswap64 (uint64_t x)
1115 {
1116 return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
1117 }
1118 #endif
1119
1120 #if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
1121 #define ecb_unreachable() __builtin_unreachable ()
1122 #else
1123 /* this seems to work fine, but gcc always emits a warning for it :/ */
1124 ecb_inline ecb_noreturn void ecb_unreachable (void);
ecb_unreachable(void)1125 ecb_inline ecb_noreturn void ecb_unreachable (void) { }
1126 #endif
1127
1128 /* try to tell the compiler that some condition is definitely true */
1129 #define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
1130
1131 ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
1132 ecb_inline ecb_const uint32_t
ecb_byteorder_helper(void)1133 ecb_byteorder_helper (void)
1134 {
1135 /* the union code still generates code under pressure in gcc, */
1136 /* but less than using pointers, and always seems to */
1137 /* successfully return a constant. */
1138 /* the reason why we have this horrible preprocessor mess */
1139 /* is to avoid it in all cases, at least on common architectures */
1140 /* or when using a recent enough gcc version (>= 4.6) */
1141 #if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
1142 || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
1143 #define ECB_LITTLE_ENDIAN 1
1144 return 0x44332211;
1145 #elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
1146 || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
1147 #define ECB_BIG_ENDIAN 1
1148 return 0x11223344;
1149 #else
1150 union
1151 {
1152 uint8_t c[4];
1153 uint32_t u;
1154 } u = { 0x11, 0x22, 0x33, 0x44 };
1155 return u.u;
1156 #endif
1157 }
1158
1159 ecb_inline ecb_const ecb_bool ecb_big_endian (void);
ecb_big_endian(void)1160 ecb_inline ecb_const ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11223344; }
1161 ecb_inline ecb_const ecb_bool ecb_little_endian (void);
ecb_little_endian(void)1162 ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
1163
1164 #if ECB_GCC_VERSION(3,0) || ECB_C99
1165 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
1166 #else
1167 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
1168 #endif
1169
1170 #if ECB_CPP
1171 template<typename T>
ecb_div_rd(T val,T div)1172 static inline T ecb_div_rd (T val, T div)
1173 {
1174 return val < 0 ? - ((-val + div - 1) / div) : (val ) / div;
1175 }
1176 template<typename T>
ecb_div_ru(T val,T div)1177 static inline T ecb_div_ru (T val, T div)
1178 {
1179 return val < 0 ? - ((-val ) / div) : (val + div - 1) / div;
1180 }
1181 #else
1182 #define ecb_div_rd(val,div) ((val) < 0 ? - ((-(val) + (div) - 1) / (div)) : ((val) ) / (div))
1183 #define ecb_div_ru(val,div) ((val) < 0 ? - ((-(val) ) / (div)) : ((val) + (div) - 1) / (div))
1184 #endif
1185
1186 #if ecb_cplusplus_does_not_suck
1187 /* does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) */
1188 template<typename T, int N>
ecb_array_length(const T (& arr)[N])1189 static inline int ecb_array_length (const T (&arr)[N])
1190 {
1191 return N;
1192 }
1193 #else
1194 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
1195 #endif
1196
1197 ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
1198 ecb_function_ ecb_const uint32_t
ecb_binary16_to_binary32(uint32_t x)1199 ecb_binary16_to_binary32 (uint32_t x)
1200 {
1201 unsigned int s = (x & 0x8000) << (31 - 15);
1202 int e = (x >> 10) & 0x001f;
1203 unsigned int m = x & 0x03ff;
1204
1205 if (ecb_expect_false (e == 31))
1206 /* infinity or NaN */
1207 e = 255 - (127 - 15);
1208 else if (ecb_expect_false (!e))
1209 {
1210 if (ecb_expect_true (!m))
1211 /* zero, handled by code below by forcing e to 0 */
1212 e = 0 - (127 - 15);
1213 else
1214 {
1215 /* subnormal, renormalise */
1216 unsigned int s = 10 - ecb_ld32 (m);
1217
1218 m = (m << s) & 0x3ff; /* mask implicit bit */
1219 e -= s - 1;
1220 }
1221 }
1222
1223 /* e and m now are normalised, or zero, (or inf or nan) */
1224 e += 127 - 15;
1225
1226 return s | (e << 23) | (m << (23 - 10));
1227 }
1228
1229 ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
1230 ecb_function_ ecb_const uint16_t
ecb_binary32_to_binary16(uint32_t x)1231 ecb_binary32_to_binary16 (uint32_t x)
1232 {
1233 unsigned int s = (x >> 16) & 0x00008000; /* sign bit, the easy part */
1234 unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
1235 unsigned int m = x & 0x007fffff;
1236
1237 x &= 0x7fffffff;
1238
1239 /* if it's within range of binary16 normals, use fast path */
1240 if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
1241 {
1242 /* mantissa round-to-even */
1243 m += 0x00000fff + ((m >> (23 - 10)) & 1);
1244
1245 /* handle overflow */
1246 if (ecb_expect_false (m >= 0x00800000))
1247 {
1248 m >>= 1;
1249 e += 1;
1250 }
1251
1252 return s | (e << 10) | (m >> (23 - 10));
1253 }
1254
1255 /* handle large numbers and infinity */
1256 if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
1257 return s | 0x7c00;
1258
1259 /* handle zero, subnormals and small numbers */
1260 if (ecb_expect_true (x < 0x38800000))
1261 {
1262 /* zero */
1263 if (ecb_expect_true (!x))
1264 return s;
1265
1266 /* handle subnormals */
1267
1268 /* too small, will be zero */
1269 if (e < (14 - 24)) /* might not be sharp, but is good enough */
1270 return s;
1271
1272 m |= 0x00800000; /* make implicit bit explicit */
1273
1274 /* very tricky - we need to round to the nearest e (+10) bit value */
1275 {
1276 unsigned int bits = 14 - e;
1277 unsigned int half = (1 << (bits - 1)) - 1;
1278 unsigned int even = (m >> bits) & 1;
1279
1280 /* if this overflows, we will end up with a normalised number */
1281 m = (m + half + even) >> bits;
1282 }
1283
1284 return s | m;
1285 }
1286
1287 /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
1288 m >>= 13;
1289
1290 return s | 0x7c00 | m | !m;
1291 }
1292
1293 /*******************************************************************************/
1294 /* floating point stuff, can be disabled by defining ECB_NO_LIBM */
1295
1296 /* basically, everything uses "ieee pure-endian" floating point numbers */
1297 /* the only noteworthy exception is ancient armle, which uses order 43218765 */
1298 #if 0 \
1299 || __i386 || __i386__ \
1300 || ECB_GCC_AMD64 \
1301 || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
1302 || defined __s390__ || defined __s390x__ \
1303 || defined __mips__ \
1304 || defined __alpha__ \
1305 || defined __hppa__ \
1306 || defined __ia64__ \
1307 || defined __m68k__ \
1308 || defined __m88k__ \
1309 || defined __sh__ \
1310 || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
1311 || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
1312 || defined __aarch64__
1313 #define ECB_STDFP 1
1314 #include <string.h> /* for memcpy */
1315 #else
1316 #define ECB_STDFP 0
1317 #endif
1318
1319 #ifndef ECB_NO_LIBM
1320
1321 #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
1322
1323 /* only the oldest of old doesn't have this one. solaris. */
1324 #ifdef INFINITY
1325 #define ECB_INFINITY INFINITY
1326 #else
1327 #define ECB_INFINITY HUGE_VAL
1328 #endif
1329
1330 #ifdef NAN
1331 #define ECB_NAN NAN
1332 #else
1333 #define ECB_NAN ECB_INFINITY
1334 #endif
1335
1336 #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
1337 #define ecb_ldexpf(x,e) ldexpf ((x), (e))
1338 #define ecb_frexpf(x,e) frexpf ((x), (e))
1339 #else
1340 #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
1341 #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
1342 #endif
1343
1344 /* convert a float to ieee single/binary32 */
1345 ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
1346 ecb_function_ ecb_const uint32_t
ecb_float_to_binary32(float x)1347 ecb_float_to_binary32 (float x)
1348 {
1349 uint32_t r;
1350
1351 #if ECB_STDFP
1352 memcpy (&r, &x, 4);
1353 #else
1354 /* slow emulation, works for anything but -0 */
1355 uint32_t m;
1356 int e;
1357
1358 if (x == 0e0f ) return 0x00000000U;
1359 if (x > +3.40282346638528860e+38f) return 0x7f800000U;
1360 if (x < -3.40282346638528860e+38f) return 0xff800000U;
1361 if (x != x ) return 0x7fbfffffU;
1362
1363 m = ecb_frexpf (x, &e) * 0x1000000U;
1364
1365 r = m & 0x80000000U;
1366
1367 if (r)
1368 m = -m;
1369
1370 if (e <= -126)
1371 {
1372 m &= 0xffffffU;
1373 m >>= (-125 - e);
1374 e = -126;
1375 }
1376
1377 r |= (e + 126) << 23;
1378 r |= m & 0x7fffffU;
1379 #endif
1380
1381 return r;
1382 }
1383
1384 /* converts an ieee single/binary32 to a float */
1385 ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
1386 ecb_function_ ecb_const float
ecb_binary32_to_float(uint32_t x)1387 ecb_binary32_to_float (uint32_t x)
1388 {
1389 float r;
1390
1391 #if ECB_STDFP
1392 memcpy (&r, &x, 4);
1393 #else
1394 /* emulation, only works for normals and subnormals and +0 */
1395 int neg = x >> 31;
1396 int e = (x >> 23) & 0xffU;
1397
1398 x &= 0x7fffffU;
1399
1400 if (e)
1401 x |= 0x800000U;
1402 else
1403 e = 1;
1404
1405 /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
1406 r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
1407
1408 r = neg ? -r : r;
1409 #endif
1410
1411 return r;
1412 }
1413
1414 /* convert a double to ieee double/binary64 */
1415 ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
1416 ecb_function_ ecb_const uint64_t
ecb_double_to_binary64(double x)1417 ecb_double_to_binary64 (double x)
1418 {
1419 uint64_t r;
1420
1421 #if ECB_STDFP
1422 memcpy (&r, &x, 8);
1423 #else
1424 /* slow emulation, works for anything but -0 */
1425 uint64_t m;
1426 int e;
1427
1428 if (x == 0e0 ) return 0x0000000000000000U;
1429 if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
1430 if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
1431 if (x != x ) return 0X7ff7ffffffffffffU;
1432
1433 m = frexp (x, &e) * 0x20000000000000U;
1434
1435 r = m & 0x8000000000000000;;
1436
1437 if (r)
1438 m = -m;
1439
1440 if (e <= -1022)
1441 {
1442 m &= 0x1fffffffffffffU;
1443 m >>= (-1021 - e);
1444 e = -1022;
1445 }
1446
1447 r |= ((uint64_t)(e + 1022)) << 52;
1448 r |= m & 0xfffffffffffffU;
1449 #endif
1450
1451 return r;
1452 }
1453
1454 /* converts an ieee double/binary64 to a double */
1455 ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
1456 ecb_function_ ecb_const double
ecb_binary64_to_double(uint64_t x)1457 ecb_binary64_to_double (uint64_t x)
1458 {
1459 double r;
1460
1461 #if ECB_STDFP
1462 memcpy (&r, &x, 8);
1463 #else
1464 /* emulation, only works for normals and subnormals and +0 */
1465 int neg = x >> 63;
1466 int e = (x >> 52) & 0x7ffU;
1467
1468 x &= 0xfffffffffffffU;
1469
1470 if (e)
1471 x |= 0x10000000000000U;
1472 else
1473 e = 1;
1474
1475 /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
1476 r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
1477
1478 r = neg ? -r : r;
1479 #endif
1480
1481 return r;
1482 }
1483
1484 /* convert a float to ieee half/binary16 */
1485 ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
1486 ecb_function_ ecb_const uint16_t
ecb_float_to_binary16(float x)1487 ecb_float_to_binary16 (float x)
1488 {
1489 return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
1490 }
1491
1492 /* convert an ieee half/binary16 to float */
1493 ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
1494 ecb_function_ ecb_const float
ecb_binary16_to_float(uint16_t x)1495 ecb_binary16_to_float (uint16_t x)
1496 {
1497 return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
1498 }
1499
1500 #endif
1501
1502 #endif
1503
1504 /* ECB.H END */
1505
1506 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
1507 /* if your architecture doesn't need memory fences, e.g. because it is
1508 * single-cpu/core, or if you use libev in a project that doesn't use libev
1509 * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
1510 * libev, in which cases the memory fences become nops.
1511 * alternatively, you can remove this #error and link against libpthread,
1512 * which will then provide the memory fences.
1513 */
1514 # error "memory fences not defined for your architecture, please report"
1515 #endif
1516
1517 #ifndef ECB_MEMORY_FENCE
1518 # define ECB_MEMORY_FENCE do { } while (0)
1519 # define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
1520 # define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
1521 #endif
1522
1523 #define expect_false(cond) ecb_expect_false (cond)
1524 #define expect_true(cond) ecb_expect_true (cond)
1525 #define noinline ecb_noinline
1526
1527 #define inline_size ecb_inline
1528
1529 #if EV_FEATURE_CODE
1530 # define inline_speed ecb_inline
1531 #else
1532 # define inline_speed static noinline
1533 #endif
1534
1535 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
1536
1537 #if EV_MINPRI == EV_MAXPRI
1538 # define ABSPRI(w) (((W)w), 0)
1539 #else
1540 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
1541 #endif
1542
1543 #define EMPTY /* required for microsofts broken pseudo-c compiler */
1544 #define EMPTY2(a,b) /* used to suppress some warnings */
1545
1546 typedef ev_watcher *W;
1547 typedef ev_watcher_list *WL;
1548 typedef ev_watcher_time *WT;
1549
1550 #define ev_active(w) ((W)(w))->active
1551 #define ev_at(w) ((WT)(w))->at
1552
1553 #if EV_USE_REALTIME
1554 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
1555 /* giving it a reasonably high chance of working on typical architectures */
1556 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
1557 #endif
1558
1559 #if EV_USE_MONOTONIC
1560 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
1561 #endif
1562
1563 #ifndef EV_FD_TO_WIN32_HANDLE
1564 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
1565 #endif
1566 #ifndef EV_WIN32_HANDLE_TO_FD
1567 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
1568 #endif
1569 #ifndef EV_WIN32_CLOSE_FD
1570 # define EV_WIN32_CLOSE_FD(fd) close (fd)
1571 #endif
1572
1573 #ifdef _WIN32
1574 # include "ev_win32.c"
1575 #endif
1576
1577 /*****************************************************************************/
1578
1579 /* define a suitable floor function (only used by periodics atm) */
1580
1581 #if EV_USE_FLOOR
1582 # include <math.h>
1583 # define ev_floor(v) floor (v)
1584 #else
1585
1586 #include <float.h>
1587
1588 /* a floor() replacement function, should be independent of ev_tstamp type */
1589 static ev_tstamp noinline
ev_floor(ev_tstamp v)1590 ev_floor (ev_tstamp v)
1591 {
1592 /* the choice of shift factor is not terribly important */
1593 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
1594 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
1595 #else
1596 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
1597 #endif
1598
1599 /* argument too large for an unsigned long? */
1600 if (expect_false (v >= shift))
1601 {
1602 ev_tstamp f;
1603
1604 if (v == v - 1.)
1605 return v; /* very large number */
1606
1607 f = shift * ev_floor (v * (1. / shift));
1608 return f + ev_floor (v - f);
1609 }
1610
1611 /* special treatment for negative args? */
1612 if (expect_false (v < 0.))
1613 {
1614 ev_tstamp f = -ev_floor (-v);
1615
1616 return f - (f == v ? 0 : 1);
1617 }
1618
1619 /* fits into an unsigned long */
1620 return (unsigned long)v;
1621 }
1622
1623 #endif
1624
1625 /*****************************************************************************/
1626
1627 #ifdef __linux
1628 # include <sys/utsname.h>
1629 #endif
1630
1631 static unsigned int noinline ecb_cold
ev_linux_version(void)1632 ev_linux_version (void)
1633 {
1634 #ifdef __linux
1635 unsigned int v = 0;
1636 struct utsname buf;
1637 int i;
1638 char *p = buf.release;
1639
1640 if (uname (&buf))
1641 return 0;
1642
1643 for (i = 3+1; --i; )
1644 {
1645 unsigned int c = 0;
1646
1647 for (;;)
1648 {
1649 if (*p >= '0' && *p <= '9')
1650 c = c * 10 + *p++ - '0';
1651 else
1652 {
1653 p += *p == '.';
1654 break;
1655 }
1656 }
1657
1658 v = (v << 8) | c;
1659 }
1660
1661 return v;
1662 #else
1663 return 0;
1664 #endif
1665 }
1666
1667 /*****************************************************************************/
1668
1669 #if EV_AVOID_STDIO
1670 static void noinline ecb_cold
ev_printerr(const char * msg)1671 ev_printerr (const char *msg)
1672 {
1673 write (STDERR_FILENO, msg, strlen (msg));
1674 }
1675 #endif
1676
1677 static void (*syserr_cb)(const char *msg) EV_THROW;
1678
1679 void ecb_cold
ev_set_syserr_cb(void (* cb)(const char * msg)EV_THROW)1680 ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
1681 {
1682 syserr_cb = cb;
1683 }
1684
1685 static void noinline ecb_cold
ev_syserr(const char * msg)1686 ev_syserr (const char *msg)
1687 {
1688 if (!msg)
1689 msg = "(libev) system error";
1690
1691 if (syserr_cb)
1692 syserr_cb (msg);
1693 else
1694 {
1695 #if EV_AVOID_STDIO
1696 ev_printerr (msg);
1697 ev_printerr (": ");
1698 ev_printerr (strerror (errno));
1699 ev_printerr ("\n");
1700 #else
1701 perror (msg);
1702 #endif
1703 abort ();
1704 }
1705 }
1706
1707 static void *
ev_realloc_emul(void * ptr,long size)1708 ev_realloc_emul (void *ptr, long size) EV_THROW
1709 {
1710 /* some systems, notably openbsd and darwin, fail to properly
1711 * implement realloc (x, 0) (as required by both ansi c-89 and
1712 * the single unix specification, so work around them here.
1713 * recently, also (at least) fedora and debian started breaking it,
1714 * despite documenting it otherwise.
1715 */
1716
1717 if (size)
1718 return realloc (ptr, size);
1719
1720 free (ptr);
1721 return 0;
1722 }
1723
1724 static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
1725
1726 void ecb_cold
ev_set_allocator(void * (* cb)(void * ptr,long size)EV_THROW)1727 ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
1728 {
1729 alloc = cb;
1730 }
1731
1732 inline_speed void *
ev_realloc(void * ptr,long size)1733 ev_realloc (void *ptr, long size)
1734 {
1735 ptr = alloc (ptr, size);
1736
1737 if (!ptr && size)
1738 {
1739 #if EV_AVOID_STDIO
1740 ev_printerr ("(libev) memory allocation failed, aborting.\n");
1741 #else
1742 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
1743 #endif
1744 abort ();
1745 }
1746
1747 return ptr;
1748 }
1749
1750 #define ev_malloc(size) ev_realloc (0, (size))
1751 #define ev_free(ptr) ev_realloc ((ptr), 0)
1752
1753 /*****************************************************************************/
1754
1755 /* set in reify when reification needed */
1756 #define EV_ANFD_REIFY 1
1757
1758 /* file descriptor info structure */
1759 typedef struct
1760 {
1761 WL head;
1762 unsigned char events; /* the events watched for */
1763 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
1764 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
1765 unsigned char unused;
1766 #if EV_USE_EPOLL
1767 unsigned int egen; /* generation counter to counter epoll bugs */
1768 #endif
1769 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1770 SOCKET handle;
1771 #endif
1772 #if EV_USE_IOCP
1773 OVERLAPPED or, ow;
1774 #endif
1775 } ANFD;
1776
1777 /* stores the pending event set for a given watcher */
1778 typedef struct
1779 {
1780 W w;
1781 int events; /* the pending event set for the given watcher */
1782 } ANPENDING;
1783
1784 #if EV_USE_INOTIFY
1785 /* hash table entry per inotify-id */
1786 typedef struct
1787 {
1788 WL head;
1789 } ANFS;
1790 #endif
1791
1792 /* Heap Entry */
1793 #if EV_HEAP_CACHE_AT
1794 /* a heap element */
1795 typedef struct {
1796 ev_tstamp at;
1797 WT w;
1798 } ANHE;
1799
1800 #define ANHE_w(he) (he).w /* access watcher, read-write */
1801 #define ANHE_at(he) (he).at /* access cached at, read-only */
1802 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
1803 #else
1804 /* a heap element */
1805 typedef WT ANHE;
1806
1807 #define ANHE_w(he) (he)
1808 #define ANHE_at(he) (he)->at
1809 #define ANHE_at_cache(he)
1810 #endif
1811
1812 #if EV_MULTIPLICITY
1813
1814 struct ev_loop
1815 {
1816 ev_tstamp ev_rt_now;
1817 #define ev_rt_now ((loop)->ev_rt_now)
1818 #define VAR(name,decl) decl;
1819 #include "ev_vars.h"
1820 #undef VAR
1821 };
1822 #include "ev_wrap.h"
1823
1824 static struct ev_loop default_loop_struct;
1825 EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
1826
1827 #else
1828
1829 EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
1830 #define VAR(name,decl) static decl;
1831 #include "ev_vars.h"
1832 #undef VAR
1833
1834 static int ev_default_loop_ptr;
1835
1836 #endif
1837
1838 #if EV_FEATURE_API
1839 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
1840 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
1841 # define EV_INVOKE_PENDING invoke_cb (EV_A)
1842 #else
1843 # define EV_RELEASE_CB (void)0
1844 # define EV_ACQUIRE_CB (void)0
1845 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
1846 #endif
1847
1848 #define EVBREAK_RECURSE 0x80
1849
1850 /*****************************************************************************/
1851
1852 #ifndef EV_HAVE_EV_TIME
1853 ev_tstamp
ev_time(void)1854 ev_time (void) EV_THROW
1855 {
1856 #if EV_USE_REALTIME
1857 if (expect_true (have_realtime))
1858 {
1859 struct timespec ts;
1860 clock_gettime (CLOCK_REALTIME, &ts);
1861 return ts.tv_sec + ts.tv_nsec * 1e-9;
1862 }
1863 #endif
1864
1865 struct timeval tv;
1866 gettimeofday (&tv, 0);
1867 return tv.tv_sec + tv.tv_usec * 1e-6;
1868 }
1869 #endif
1870
1871 inline_size ev_tstamp
get_clock(void)1872 get_clock (void)
1873 {
1874 #if EV_USE_MONOTONIC
1875 if (expect_true (have_monotonic))
1876 {
1877 struct timespec ts;
1878 clock_gettime (CLOCK_MONOTONIC, &ts);
1879 return ts.tv_sec + ts.tv_nsec * 1e-9;
1880 }
1881 #endif
1882
1883 return ev_time ();
1884 }
1885
1886 #if EV_MULTIPLICITY
1887 ev_tstamp
ev_now(EV_P)1888 ev_now (EV_P) EV_THROW
1889 {
1890 return ev_rt_now;
1891 }
1892 #endif
1893
1894 void
ev_sleep(ev_tstamp delay)1895 ev_sleep (ev_tstamp delay) EV_THROW
1896 {
1897 if (delay > 0.)
1898 {
1899 #if EV_USE_NANOSLEEP
1900 struct timespec ts;
1901
1902 EV_TS_SET (ts, delay);
1903 nanosleep (&ts, 0);
1904 #elif defined _WIN32
1905 Sleep ((unsigned long)(delay * 1e3));
1906 #else
1907 struct timeval tv;
1908
1909 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
1910 /* something not guaranteed by newer posix versions, but guaranteed */
1911 /* by older ones */
1912 EV_TV_SET (tv, delay);
1913 select (0, 0, 0, 0, &tv);
1914 #endif
1915 }
1916 }
1917
1918 /*****************************************************************************/
1919
1920 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
1921
1922 /* find a suitable new size for the given array, */
1923 /* hopefully by rounding to a nice-to-malloc size */
1924 inline_size int
array_nextsize(int elem,int cur,int cnt)1925 array_nextsize (int elem, int cur, int cnt)
1926 {
1927 int ncur = cur + 1;
1928
1929 do
1930 ncur <<= 1;
1931 while (cnt > ncur);
1932
1933 /* if size is large, round to MALLOC_ROUND - 4 * longs to accommodate malloc overhead */
1934 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
1935 {
1936 ncur *= elem;
1937 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
1938 ncur = ncur - sizeof (void *) * 4;
1939 ncur /= elem;
1940 }
1941
1942 return ncur;
1943 }
1944
1945 static void * noinline ecb_cold
array_realloc(int elem,void * base,int * cur,int cnt)1946 array_realloc (int elem, void *base, int *cur, int cnt)
1947 {
1948 *cur = array_nextsize (elem, *cur, cnt);
1949 return ev_realloc (base, elem * *cur);
1950 }
1951
1952 #define array_init_zero(base,count) \
1953 memset ((void *)(base), 0, sizeof (*(base)) * (count))
1954
1955 #define array_needsize(type,base,cur,cnt,init) \
1956 if (expect_false ((cnt) > (cur))) \
1957 { \
1958 int ecb_unused ocur_ = (cur); \
1959 (base) = (type *)array_realloc \
1960 (sizeof (type), (base), &(cur), (cnt)); \
1961 init ((base) + (ocur_), (cur) - ocur_); \
1962 }
1963
1964 #if 0
1965 #define array_slim(type,stem) \
1966 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
1967 { \
1968 stem ## max = array_roundsize (stem ## cnt >> 1); \
1969 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
1970 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
1971 }
1972 #endif
1973
1974 #define array_free(stem, idx) \
1975 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
1976
1977 /*****************************************************************************/
1978
1979 /* dummy callback for pending events */
1980 static void noinline
pendingcb(EV_P_ ev_prepare * w,int revents)1981 pendingcb (EV_P_ ev_prepare *w, int revents)
1982 {
1983 }
1984
1985 void noinline
ev_feed_event(EV_P_ void * w,int revents)1986 ev_feed_event (EV_P_ void *w, int revents) EV_THROW
1987 {
1988 W w_ = (W)w;
1989 int pri = ABSPRI (w_);
1990
1991 if (expect_false (w_->pending))
1992 pendings [pri][w_->pending - 1].events |= revents;
1993 else
1994 {
1995 w_->pending = ++pendingcnt [pri];
1996 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1997 pendings [pri][w_->pending - 1].w = w_;
1998 pendings [pri][w_->pending - 1].events = revents;
1999 }
2000
2001 pendingpri = NUMPRI - 1;
2002 }
2003
2004 inline_speed void
feed_reverse(EV_P_ W w)2005 feed_reverse (EV_P_ W w)
2006 {
2007 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
2008 rfeeds [rfeedcnt++] = w;
2009 }
2010
2011 inline_size void
feed_reverse_done(EV_P_ int revents)2012 feed_reverse_done (EV_P_ int revents)
2013 {
2014 do
2015 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
2016 while (rfeedcnt);
2017 }
2018
2019 inline_speed void
queue_events(EV_P_ W * events,int eventcnt,int type)2020 queue_events (EV_P_ W *events, int eventcnt, int type)
2021 {
2022 int i;
2023
2024 for (i = 0; i < eventcnt; ++i)
2025 ev_feed_event (EV_A_ events [i], type);
2026 }
2027
2028 /*****************************************************************************/
2029
2030 inline_speed void
fd_event_nocheck(EV_P_ int fd,int revents)2031 fd_event_nocheck (EV_P_ int fd, int revents)
2032 {
2033 ANFD *anfd = anfds + fd;
2034 ev_io *w;
2035
2036 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
2037 {
2038 int ev = w->events & revents;
2039
2040 if (ev)
2041 ev_feed_event (EV_A_ (W)w, ev);
2042 }
2043 }
2044
2045 /* do not submit kernel events for fds that have reify set */
2046 /* because that means they changed while we were polling for new events */
2047 inline_speed void
fd_event(EV_P_ int fd,int revents)2048 fd_event (EV_P_ int fd, int revents)
2049 {
2050 ANFD *anfd = anfds + fd;
2051
2052 if (expect_true (!anfd->reify))
2053 fd_event_nocheck (EV_A_ fd, revents);
2054 }
2055
2056 void
ev_feed_fd_event(EV_P_ int fd,int revents)2057 ev_feed_fd_event (EV_P_ int fd, int revents) EV_THROW
2058 {
2059 if (fd >= 0 && fd < anfdmax)
2060 fd_event_nocheck (EV_A_ fd, revents);
2061 }
2062
2063 /* make sure the external fd watch events are in-sync */
2064 /* with the kernel/libev internal state */
2065 inline_size void
fd_reify(EV_P)2066 fd_reify (EV_P)
2067 {
2068 int i;
2069
2070 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
2071 for (i = 0; i < fdchangecnt; ++i)
2072 {
2073 int fd = fdchanges [i];
2074 ANFD *anfd = anfds + fd;
2075
2076 if (anfd->reify & EV__IOFDSET && anfd->head)
2077 {
2078 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
2079
2080 if (handle != anfd->handle)
2081 {
2082 unsigned long arg;
2083
2084 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
2085
2086 /* handle changed, but fd didn't - we need to do it in two steps */
2087 backend_modify (EV_A_ fd, anfd->events, 0);
2088 anfd->events = 0;
2089 anfd->handle = handle;
2090 }
2091 }
2092 }
2093 #endif
2094
2095 for (i = 0; i < fdchangecnt; ++i)
2096 {
2097 int fd = fdchanges [i];
2098 ANFD *anfd = anfds + fd;
2099 ev_io *w;
2100
2101 unsigned char o_events = anfd->events;
2102 unsigned char o_reify = anfd->reify;
2103
2104 anfd->reify = 0;
2105
2106 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
2107 {
2108 anfd->events = 0;
2109
2110 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
2111 anfd->events |= (unsigned char)w->events;
2112
2113 if (o_events != anfd->events)
2114 o_reify = EV__IOFDSET; /* actually |= */
2115 }
2116
2117 if (o_reify & EV__IOFDSET)
2118 backend_modify (EV_A_ fd, o_events, anfd->events);
2119 }
2120
2121 fdchangecnt = 0;
2122 }
2123
2124 /* something about the given fd changed */
2125 inline_size void
fd_change(EV_P_ int fd,int flags)2126 fd_change (EV_P_ int fd, int flags)
2127 {
2128 unsigned char reify = anfds [fd].reify;
2129 anfds [fd].reify |= flags;
2130
2131 if (expect_true (!reify))
2132 {
2133 ++fdchangecnt;
2134 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
2135 fdchanges [fdchangecnt - 1] = fd;
2136 }
2137 }
2138
2139 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
2140 inline_speed void ecb_cold
fd_kill(EV_P_ int fd)2141 fd_kill (EV_P_ int fd)
2142 {
2143 ev_io *w;
2144
2145 while ((w = (ev_io *)anfds [fd].head))
2146 {
2147 ev_io_stop (EV_A_ w);
2148 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
2149 }
2150 }
2151
2152 /* check whether the given fd is actually valid, for error recovery */
2153 inline_size int ecb_cold
fd_valid(int fd)2154 fd_valid (int fd)
2155 {
2156 #ifdef _WIN32
2157 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
2158 #else
2159 return fcntl (fd, F_GETFD) != -1;
2160 #endif
2161 }
2162
2163 /* called on EBADF to verify fds */
2164 static void noinline ecb_cold
fd_ebadf(EV_P)2165 fd_ebadf (EV_P)
2166 {
2167 int fd;
2168
2169 for (fd = 0; fd < anfdmax; ++fd)
2170 if (anfds [fd].events)
2171 if (!fd_valid (fd) && errno == EBADF)
2172 fd_kill (EV_A_ fd);
2173 }
2174
2175 /* called on ENOMEM in select/poll to kill some fds and retry */
2176 static void noinline ecb_cold
fd_enomem(EV_P)2177 fd_enomem (EV_P)
2178 {
2179 int fd;
2180
2181 for (fd = anfdmax; fd--; )
2182 if (anfds [fd].events)
2183 {
2184 fd_kill (EV_A_ fd);
2185 break;
2186 }
2187 }
2188
2189 /* usually called after fork if backend needs to re-arm all fds from scratch */
2190 static void noinline
fd_rearm_all(EV_P)2191 fd_rearm_all (EV_P)
2192 {
2193 int fd;
2194
2195 for (fd = 0; fd < anfdmax; ++fd)
2196 if (anfds [fd].events)
2197 {
2198 anfds [fd].events = 0;
2199 anfds [fd].emask = 0;
2200 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
2201 }
2202 }
2203
2204 /* used to prepare libev internal fd's */
2205 /* this is not fork-safe */
2206 inline_speed void
fd_intern(int fd)2207 fd_intern (int fd)
2208 {
2209 #ifdef _WIN32
2210 unsigned long arg = 1;
2211 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
2212 #else
2213 fcntl (fd, F_SETFD, FD_CLOEXEC);
2214 fcntl (fd, F_SETFL, O_NONBLOCK);
2215 #endif
2216 }
2217
2218 /*****************************************************************************/
2219
2220 /*
2221 * the heap functions want a real array index. array index 0 is guaranteed to not
2222 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
2223 * the branching factor of the d-tree.
2224 */
2225
2226 /*
2227 * at the moment we allow libev the luxury of two heaps,
2228 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
2229 * which is more cache-efficient.
2230 * the difference is about 5% with 50000+ watchers.
2231 */
2232 #if EV_USE_4HEAP
2233
2234 #define DHEAP 4
2235 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
2236 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
2237 #define UPHEAP_DONE(p,k) ((p) == (k))
2238
2239 /* away from the root */
2240 inline_speed void
downheap(ANHE * heap,int N,int k)2241 downheap (ANHE *heap, int N, int k)
2242 {
2243 ANHE he = heap [k];
2244 ANHE *E = heap + N + HEAP0;
2245
2246 for (;;)
2247 {
2248 ev_tstamp minat;
2249 ANHE *minpos;
2250 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
2251
2252 /* find minimum child */
2253 if (expect_true (pos + DHEAP - 1 < E))
2254 {
2255 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
2256 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
2257 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
2258 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
2259 }
2260 else if (pos < E)
2261 {
2262 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
2263 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
2264 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
2265 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
2266 }
2267 else
2268 break;
2269
2270 if (ANHE_at (he) <= minat)
2271 break;
2272
2273 heap [k] = *minpos;
2274 ev_active (ANHE_w (*minpos)) = k;
2275
2276 k = minpos - heap;
2277 }
2278
2279 heap [k] = he;
2280 ev_active (ANHE_w (he)) = k;
2281 }
2282
2283 #else /* 4HEAP */
2284
2285 #define HEAP0 1
2286 #define HPARENT(k) ((k) >> 1)
2287 #define UPHEAP_DONE(p,k) (!(p))
2288
2289 /* away from the root */
2290 inline_speed void
downheap(ANHE * heap,int N,int k)2291 downheap (ANHE *heap, int N, int k)
2292 {
2293 ANHE he = heap [k];
2294
2295 for (;;)
2296 {
2297 int c = k << 1;
2298
2299 if (c >= N + HEAP0)
2300 break;
2301
2302 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
2303 ? 1 : 0;
2304
2305 if (ANHE_at (he) <= ANHE_at (heap [c]))
2306 break;
2307
2308 heap [k] = heap [c];
2309 ev_active (ANHE_w (heap [k])) = k;
2310
2311 k = c;
2312 }
2313
2314 heap [k] = he;
2315 ev_active (ANHE_w (he)) = k;
2316 }
2317 #endif
2318
2319 /* towards the root */
2320 inline_speed void
upheap(ANHE * heap,int k)2321 upheap (ANHE *heap, int k)
2322 {
2323 ANHE he = heap [k];
2324
2325 for (;;)
2326 {
2327 int p = HPARENT (k);
2328
2329 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
2330 break;
2331
2332 heap [k] = heap [p];
2333 ev_active (ANHE_w (heap [k])) = k;
2334 k = p;
2335 }
2336
2337 heap [k] = he;
2338 ev_active (ANHE_w (he)) = k;
2339 }
2340
2341 /* move an element suitably so it is in a correct place */
2342 inline_size void
adjustheap(ANHE * heap,int N,int k)2343 adjustheap (ANHE *heap, int N, int k)
2344 {
2345 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
2346 upheap (heap, k);
2347 else
2348 downheap (heap, N, k);
2349 }
2350
2351 /* rebuild the heap: this function is used only once and executed rarely */
2352 inline_size void
reheap(ANHE * heap,int N)2353 reheap (ANHE *heap, int N)
2354 {
2355 int i;
2356
2357 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
2358 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
2359 for (i = 0; i < N; ++i)
2360 upheap (heap, i + HEAP0);
2361 }
2362
2363 /*****************************************************************************/
2364
2365 /* associate signal watchers to a signal signal */
2366 typedef struct
2367 {
2368 EV_ATOMIC_T pending;
2369 #if EV_MULTIPLICITY
2370 EV_P;
2371 #endif
2372 WL head;
2373 } ANSIG;
2374
2375 static ANSIG signals [EV_NSIG - 1];
2376
2377 /*****************************************************************************/
2378
2379 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2380
2381 static void noinline ecb_cold
evpipe_init(EV_P)2382 evpipe_init (EV_P)
2383 {
2384 if (!ev_is_active (&pipe_w))
2385 {
2386 int fds [2];
2387
2388 # if EV_USE_EVENTFD
2389 fds [0] = -1;
2390 fds [1] = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
2391 if (fds [1] < 0 && errno == EINVAL)
2392 fds [1] = eventfd (0, 0);
2393
2394 if (fds [1] < 0)
2395 # endif
2396 {
2397 while (pipe (fds))
2398 ev_syserr ("(libev) error creating signal/async pipe");
2399
2400 fd_intern (fds [0]);
2401 }
2402
2403 evpipe [0] = fds [0];
2404
2405 if (evpipe [1] < 0)
2406 evpipe [1] = fds [1]; /* first call, set write fd */
2407 else
2408 {
2409 /* on subsequent calls, do not change evpipe [1] */
2410 /* so that evpipe_write can always rely on its value. */
2411 /* this branch does not do anything sensible on windows, */
2412 /* so must not be executed on windows */
2413
2414 dup2 (fds [1], evpipe [1]);
2415 close (fds [1]);
2416 }
2417
2418 fd_intern (evpipe [1]);
2419
2420 ev_io_set (&pipe_w, evpipe [0] < 0 ? evpipe [1] : evpipe [0], EV_READ);
2421 ev_io_start (EV_A_ &pipe_w);
2422 ev_unref (EV_A); /* watcher should not keep loop alive */
2423 }
2424 }
2425
2426 inline_speed void
evpipe_write(EV_P_ EV_ATOMIC_T * flag)2427 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
2428 {
2429 ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
2430
2431 if (expect_true (*flag))
2432 return;
2433
2434 *flag = 1;
2435 ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
2436
2437 pipe_write_skipped = 1;
2438
2439 ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
2440
2441 if (pipe_write_wanted)
2442 {
2443 int old_errno;
2444
2445 pipe_write_skipped = 0;
2446 ECB_MEMORY_FENCE_RELEASE;
2447
2448 old_errno = errno; /* save errno because write will clobber it */
2449
2450 #if EV_USE_EVENTFD
2451 if (evpipe [0] < 0)
2452 {
2453 uint64_t counter = 1;
2454 write (evpipe [1], &counter, sizeof (uint64_t));
2455 }
2456 else
2457 #endif
2458 {
2459 #ifdef _WIN32
2460 WSABUF buf;
2461 DWORD sent;
2462 buf.buf = &buf;
2463 buf.len = 1;
2464 WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
2465 #else
2466 write (evpipe [1], &(evpipe [1]), 1);
2467 #endif
2468 }
2469
2470 errno = old_errno;
2471 }
2472 }
2473
2474 /* called whenever the libev signal pipe */
2475 /* got some events (signal, async) */
2476 static void
pipecb(EV_P_ ev_io * iow,int revents)2477 pipecb (EV_P_ ev_io *iow, int revents)
2478 {
2479 int i;
2480
2481 if (revents & EV_READ)
2482 {
2483 #if EV_USE_EVENTFD
2484 if (evpipe [0] < 0)
2485 {
2486 uint64_t counter;
2487 read (evpipe [1], &counter, sizeof (uint64_t));
2488 }
2489 else
2490 #endif
2491 {
2492 char dummy[4];
2493 #ifdef _WIN32
2494 WSABUF buf;
2495 DWORD recvd;
2496 DWORD flags = 0;
2497 buf.buf = dummy;
2498 buf.len = sizeof (dummy);
2499 WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
2500 #else
2501 read (evpipe [0], &dummy, sizeof (dummy));
2502 #endif
2503 }
2504 }
2505
2506 pipe_write_skipped = 0;
2507
2508 ECB_MEMORY_FENCE; /* push out skipped, acquire flags */
2509
2510 #if EV_SIGNAL_ENABLE
2511 if (sig_pending)
2512 {
2513 sig_pending = 0;
2514
2515 ECB_MEMORY_FENCE;
2516
2517 for (i = EV_NSIG - 1; i--; )
2518 if (expect_false (signals [i].pending))
2519 ev_feed_signal_event (EV_A_ i + 1);
2520 }
2521 #endif
2522
2523 #if EV_ASYNC_ENABLE
2524 if (async_pending)
2525 {
2526 async_pending = 0;
2527
2528 ECB_MEMORY_FENCE;
2529
2530 for (i = asynccnt; i--; )
2531 if (asyncs [i]->sent)
2532 {
2533 asyncs [i]->sent = 0;
2534 ECB_MEMORY_FENCE_RELEASE;
2535 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
2536 }
2537 }
2538 #endif
2539 }
2540
2541 /*****************************************************************************/
2542
2543 void
ev_feed_signal(int signum)2544 ev_feed_signal (int signum) EV_THROW
2545 {
2546 #if EV_MULTIPLICITY
2547 EV_P;
2548 ECB_MEMORY_FENCE_ACQUIRE;
2549 EV_A = signals [signum - 1].loop;
2550
2551 if (!EV_A)
2552 return;
2553 #endif
2554
2555 signals [signum - 1].pending = 1;
2556 evpipe_write (EV_A_ &sig_pending);
2557 }
2558
2559 static void
ev_sighandler(int signum)2560 ev_sighandler (int signum)
2561 {
2562 #ifdef _WIN32
2563 signal (signum, ev_sighandler);
2564 #endif
2565
2566 ev_feed_signal (signum);
2567 }
2568
2569 void noinline
ev_feed_signal_event(EV_P_ int signum)2570 ev_feed_signal_event (EV_P_ int signum) EV_THROW
2571 {
2572 WL w;
2573
2574 if (expect_false (signum <= 0 || signum >= EV_NSIG))
2575 return;
2576
2577 --signum;
2578
2579 #if EV_MULTIPLICITY
2580 /* it is permissible to try to feed a signal to the wrong loop */
2581 /* or, likely more useful, feeding a signal nobody is waiting for */
2582
2583 if (expect_false (signals [signum].loop != EV_A))
2584 return;
2585 #endif
2586
2587 signals [signum].pending = 0;
2588 ECB_MEMORY_FENCE_RELEASE;
2589
2590 for (w = signals [signum].head; w; w = w->next)
2591 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
2592 }
2593
2594 #if EV_USE_SIGNALFD
2595 static void
sigfdcb(EV_P_ ev_io * iow,int revents)2596 sigfdcb (EV_P_ ev_io *iow, int revents)
2597 {
2598 struct signalfd_siginfo si[2], *sip; /* these structs are big */
2599
2600 for (;;)
2601 {
2602 ssize_t res = read (sigfd, si, sizeof (si));
2603
2604 /* not ISO-C, as res might be -1, but works with SuS */
2605 for (sip = si; (char *)sip < (char *)si + res; ++sip)
2606 ev_feed_signal_event (EV_A_ sip->ssi_signo);
2607
2608 if (res < (ssize_t)sizeof (si))
2609 break;
2610 }
2611 }
2612 #endif
2613
2614 #endif
2615
2616 /*****************************************************************************/
2617
2618 #if EV_CHILD_ENABLE
2619 static WL childs [EV_PID_HASHSIZE];
2620
2621 static ev_signal childev;
2622
2623 #ifndef WIFCONTINUED
2624 # define WIFCONTINUED(status) 0
2625 #endif
2626
2627 /* handle a single child status event */
2628 inline_speed void
child_reap(EV_P_ int chain,int pid,int status)2629 child_reap (EV_P_ int chain, int pid, int status)
2630 {
2631 ev_child *w;
2632 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
2633
2634 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2635 {
2636 if ((w->pid == pid || !w->pid)
2637 && (!traced || (w->flags & 1)))
2638 {
2639 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
2640 w->rpid = pid;
2641 w->rstatus = status;
2642 ev_feed_event (EV_A_ (W)w, EV_CHILD);
2643 }
2644 }
2645 }
2646
2647 #ifndef WCONTINUED
2648 # define WCONTINUED 0
2649 #endif
2650
2651 /* called on sigchld etc., calls waitpid */
2652 static void
childcb(EV_P_ ev_signal * sw,int revents)2653 childcb (EV_P_ ev_signal *sw, int revents)
2654 {
2655 int pid, status;
2656
2657 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
2658 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
2659 if (!WCONTINUED
2660 || errno != EINVAL
2661 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
2662 return;
2663
2664 /* make sure we are called again until all children have been reaped */
2665 /* we need to do it this way so that the callback gets called before we continue */
2666 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
2667
2668 child_reap (EV_A_ pid, pid, status);
2669 if ((EV_PID_HASHSIZE) > 1)
2670 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
2671 }
2672
2673 #endif
2674
2675 /*****************************************************************************/
2676
2677 #if EV_USE_IOCP
2678 # include "ev_iocp.c"
2679 #endif
2680 #if EV_USE_PORT
2681 # include "ev_port.c"
2682 #endif
2683 #if EV_USE_KQUEUE
2684 # include "ev_kqueue.c"
2685 #endif
2686 #if EV_USE_EPOLL
2687 # include "ev_epoll.c"
2688 #endif
2689 #if EV_USE_POLL
2690 # include "ev_poll.c"
2691 #endif
2692 #if EV_USE_SELECT
2693 # include "ev_select.c"
2694 #endif
2695
2696 int ecb_cold
ev_version_major(void)2697 ev_version_major (void) EV_THROW
2698 {
2699 return EV_VERSION_MAJOR;
2700 }
2701
2702 int ecb_cold
ev_version_minor(void)2703 ev_version_minor (void) EV_THROW
2704 {
2705 return EV_VERSION_MINOR;
2706 }
2707
2708 /* return true if we are running with elevated privileges and should ignore env variables */
2709 int inline_size ecb_cold
enable_secure(void)2710 enable_secure (void)
2711 {
2712 #ifdef _WIN32
2713 return 0;
2714 #else
2715 return getuid () != geteuid ()
2716 || getgid () != getegid ();
2717 #endif
2718 }
2719
2720 unsigned int ecb_cold
ev_supported_backends(void)2721 ev_supported_backends (void) EV_THROW
2722 {
2723 unsigned int flags = 0;
2724
2725 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
2726 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
2727 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
2728 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
2729 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
2730
2731 return flags;
2732 }
2733
2734 unsigned int ecb_cold
ev_recommended_backends(void)2735 ev_recommended_backends (void) EV_THROW
2736 {
2737 unsigned int flags = ev_supported_backends ();
2738
2739 #ifndef __NetBSD__
2740 /* kqueue is borked on everything but netbsd apparently */
2741 /* it usually doesn't work correctly on anything but sockets and pipes */
2742 flags &= ~EVBACKEND_KQUEUE;
2743 #endif
2744 #ifdef __APPLE__
2745 /* only select works correctly on that "unix-certified" platform */
2746 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
2747 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
2748 #endif
2749 #ifdef __FreeBSD__
2750 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
2751 #endif
2752
2753 return flags;
2754 }
2755
2756 unsigned int ecb_cold
ev_embeddable_backends(void)2757 ev_embeddable_backends (void) EV_THROW
2758 {
2759 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
2760
2761 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
2762 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
2763 flags &= ~EVBACKEND_EPOLL;
2764
2765 return flags;
2766 }
2767
2768 unsigned int
ev_backend(EV_P)2769 ev_backend (EV_P) EV_THROW
2770 {
2771 return backend;
2772 }
2773
2774 #if EV_FEATURE_API
2775 unsigned int
ev_iteration(EV_P)2776 ev_iteration (EV_P) EV_THROW
2777 {
2778 return loop_count;
2779 }
2780
2781 unsigned int
ev_depth(EV_P)2782 ev_depth (EV_P) EV_THROW
2783 {
2784 return loop_depth;
2785 }
2786
2787 void
ev_set_io_collect_interval(EV_P_ ev_tstamp interval)2788 ev_set_io_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2789 {
2790 io_blocktime = interval;
2791 }
2792
2793 void
ev_set_timeout_collect_interval(EV_P_ ev_tstamp interval)2794 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) EV_THROW
2795 {
2796 timeout_blocktime = interval;
2797 }
2798
2799 void
ev_set_userdata(EV_P_ void * data)2800 ev_set_userdata (EV_P_ void *data) EV_THROW
2801 {
2802 userdata = data;
2803 }
2804
2805 void *
ev_userdata(EV_P)2806 ev_userdata (EV_P) EV_THROW
2807 {
2808 return userdata;
2809 }
2810
2811 void
ev_set_invoke_pending_cb(EV_P_ ev_loop_callback invoke_pending_cb)2812 ev_set_invoke_pending_cb (EV_P_ ev_loop_callback invoke_pending_cb) EV_THROW
2813 {
2814 invoke_cb = invoke_pending_cb;
2815 }
2816
2817 void
ev_set_loop_release_cb(EV_P_ void (* release)(EV_P)EV_THROW,void (* acquire)(EV_P)EV_THROW)2818 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P) EV_THROW, void (*acquire)(EV_P) EV_THROW) EV_THROW
2819 {
2820 release_cb = release;
2821 acquire_cb = acquire;
2822 }
2823 #endif
2824
2825 /* initialise a loop structure, must be zero-initialised */
2826 static void noinline ecb_cold
loop_init(EV_P_ unsigned int flags)2827 loop_init (EV_P_ unsigned int flags) EV_THROW
2828 {
2829 if (!backend)
2830 {
2831 origflags = flags;
2832
2833 #if EV_USE_REALTIME
2834 if (!have_realtime)
2835 {
2836 struct timespec ts;
2837
2838 if (!clock_gettime (CLOCK_REALTIME, &ts))
2839 have_realtime = 1;
2840 }
2841 #endif
2842
2843 #if EV_USE_MONOTONIC
2844 if (!have_monotonic)
2845 {
2846 struct timespec ts;
2847
2848 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
2849 have_monotonic = 1;
2850 }
2851 #endif
2852
2853 /* pid check not overridable via env */
2854 #ifndef _WIN32
2855 if (flags & EVFLAG_FORKCHECK)
2856 curpid = getpid ();
2857 #endif
2858
2859 if (!(flags & EVFLAG_NOENV)
2860 && !enable_secure ()
2861 && getenv ("LIBEV_FLAGS"))
2862 flags = atoi (getenv ("LIBEV_FLAGS"));
2863
2864 ev_rt_now = ev_time ();
2865 mn_now = get_clock ();
2866 now_floor = mn_now;
2867 rtmn_diff = ev_rt_now - mn_now;
2868 #if EV_FEATURE_API
2869 invoke_cb = ev_invoke_pending;
2870 #endif
2871
2872 io_blocktime = 0.;
2873 timeout_blocktime = 0.;
2874 backend = 0;
2875 backend_fd = -1;
2876 sig_pending = 0;
2877 #if EV_ASYNC_ENABLE
2878 async_pending = 0;
2879 #endif
2880 pipe_write_skipped = 0;
2881 pipe_write_wanted = 0;
2882 evpipe [0] = -1;
2883 evpipe [1] = -1;
2884 #if EV_USE_INOTIFY
2885 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
2886 #endif
2887 #if EV_USE_SIGNALFD
2888 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
2889 #endif
2890
2891 if (!(flags & EVBACKEND_MASK))
2892 flags |= ev_recommended_backends ();
2893
2894 #if EV_USE_IOCP
2895 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
2896 #endif
2897 #if EV_USE_PORT
2898 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
2899 #endif
2900 #if EV_USE_KQUEUE
2901 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
2902 #endif
2903 #if EV_USE_EPOLL
2904 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
2905 #endif
2906 #if EV_USE_POLL
2907 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
2908 #endif
2909 #if EV_USE_SELECT
2910 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
2911 #endif
2912
2913 ev_prepare_init (&pending_w, pendingcb);
2914
2915 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2916 ev_init (&pipe_w, pipecb);
2917 ev_set_priority (&pipe_w, EV_MAXPRI);
2918 #endif
2919 }
2920 }
2921
2922 /* free up a loop structure */
2923 void ecb_cold
ev_loop_destroy(EV_P)2924 ev_loop_destroy (EV_P)
2925 {
2926 int i;
2927
2928 #if EV_MULTIPLICITY
2929 /* mimic free (0) */
2930 if (!EV_A)
2931 return;
2932 #endif
2933
2934 #if EV_CLEANUP_ENABLE
2935 /* queue cleanup watchers (and execute them) */
2936 if (expect_false (cleanupcnt))
2937 {
2938 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
2939 EV_INVOKE_PENDING;
2940 }
2941 #endif
2942
2943 #if EV_CHILD_ENABLE
2944 if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
2945 {
2946 ev_ref (EV_A); /* child watcher */
2947 ev_signal_stop (EV_A_ &childev);
2948 }
2949 #endif
2950
2951 if (ev_is_active (&pipe_w))
2952 {
2953 /*ev_ref (EV_A);*/
2954 /*ev_io_stop (EV_A_ &pipe_w);*/
2955
2956 if (evpipe [0] >= 0) EV_WIN32_CLOSE_FD (evpipe [0]);
2957 if (evpipe [1] >= 0) EV_WIN32_CLOSE_FD (evpipe [1]);
2958 }
2959
2960 #if EV_USE_SIGNALFD
2961 if (ev_is_active (&sigfd_w))
2962 close (sigfd);
2963 #endif
2964
2965 #if EV_USE_INOTIFY
2966 if (fs_fd >= 0)
2967 close (fs_fd);
2968 #endif
2969
2970 if (backend_fd >= 0)
2971 close (backend_fd);
2972
2973 #if EV_USE_IOCP
2974 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
2975 #endif
2976 #if EV_USE_PORT
2977 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
2978 #endif
2979 #if EV_USE_KQUEUE
2980 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
2981 #endif
2982 #if EV_USE_EPOLL
2983 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
2984 #endif
2985 #if EV_USE_POLL
2986 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
2987 #endif
2988 #if EV_USE_SELECT
2989 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
2990 #endif
2991
2992 for (i = NUMPRI; i--; )
2993 {
2994 array_free (pending, [i]);
2995 #if EV_IDLE_ENABLE
2996 array_free (idle, [i]);
2997 #endif
2998 }
2999
3000 ev_free (anfds); anfds = 0; anfdmax = 0;
3001
3002 /* have to use the microsoft-never-gets-it-right macro */
3003 array_free (rfeed, EMPTY);
3004 array_free (fdchange, EMPTY);
3005 array_free (timer, EMPTY);
3006 #if EV_PERIODIC_ENABLE
3007 array_free (periodic, EMPTY);
3008 #endif
3009 #if EV_FORK_ENABLE
3010 array_free (fork, EMPTY);
3011 #endif
3012 #if EV_CLEANUP_ENABLE
3013 array_free (cleanup, EMPTY);
3014 #endif
3015 array_free (prepare, EMPTY);
3016 array_free (check, EMPTY);
3017 #if EV_ASYNC_ENABLE
3018 array_free (async, EMPTY);
3019 #endif
3020
3021 backend = 0;
3022
3023 #if EV_MULTIPLICITY
3024 if (ev_is_default_loop (EV_A))
3025 #endif
3026 ev_default_loop_ptr = 0;
3027 #if EV_MULTIPLICITY
3028 else
3029 ev_free (EV_A);
3030 #endif
3031 }
3032
3033 #if EV_USE_INOTIFY
3034 inline_size void infy_fork (EV_P);
3035 #endif
3036
3037 inline_size void
loop_fork(EV_P)3038 loop_fork (EV_P)
3039 {
3040 #if EV_USE_PORT
3041 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
3042 #endif
3043 #if EV_USE_KQUEUE
3044 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
3045 #endif
3046 #if EV_USE_EPOLL
3047 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
3048 #endif
3049 #if EV_USE_INOTIFY
3050 infy_fork (EV_A);
3051 #endif
3052
3053 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
3054 if (ev_is_active (&pipe_w) && postfork != 2)
3055 {
3056 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
3057
3058 ev_ref (EV_A);
3059 ev_io_stop (EV_A_ &pipe_w);
3060
3061 if (evpipe [0] >= 0)
3062 EV_WIN32_CLOSE_FD (evpipe [0]);
3063
3064 evpipe_init (EV_A);
3065 /* iterate over everything, in case we missed something before */
3066 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3067 }
3068 #endif
3069
3070 postfork = 0;
3071 }
3072
3073 #if EV_MULTIPLICITY
3074
3075 struct ev_loop * ecb_cold
ev_loop_new(unsigned int flags)3076 ev_loop_new (unsigned int flags) EV_THROW
3077 {
3078 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
3079
3080 memset (EV_A, 0, sizeof (struct ev_loop));
3081 loop_init (EV_A_ flags);
3082
3083 if (ev_backend (EV_A))
3084 return EV_A;
3085
3086 ev_free (EV_A);
3087 return 0;
3088 }
3089
3090 #endif /* multiplicity */
3091
3092 #if EV_VERIFY
3093 static void noinline ecb_cold
verify_watcher(EV_P_ W w)3094 verify_watcher (EV_P_ W w)
3095 {
3096 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
3097
3098 if (w->pending)
3099 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
3100 }
3101
3102 static void noinline ecb_cold
verify_heap(EV_P_ ANHE * heap,int N)3103 verify_heap (EV_P_ ANHE *heap, int N)
3104 {
3105 int i;
3106
3107 for (i = HEAP0; i < N + HEAP0; ++i)
3108 {
3109 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
3110 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
3111 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
3112
3113 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
3114 }
3115 }
3116
3117 static void noinline ecb_cold
array_verify(EV_P_ W * ws,int cnt)3118 array_verify (EV_P_ W *ws, int cnt)
3119 {
3120 while (cnt--)
3121 {
3122 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
3123 verify_watcher (EV_A_ ws [cnt]);
3124 }
3125 }
3126 #endif
3127
3128 #if EV_FEATURE_API
3129 void ecb_cold
ev_verify(EV_P)3130 ev_verify (EV_P) EV_THROW
3131 {
3132 #if EV_VERIFY
3133 int i;
3134 WL w, w2;
3135
3136 assert (activecnt >= -1);
3137
3138 assert (fdchangemax >= fdchangecnt);
3139 for (i = 0; i < fdchangecnt; ++i)
3140 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
3141
3142 assert (anfdmax >= 0);
3143 for (i = 0; i < anfdmax; ++i)
3144 {
3145 int j = 0;
3146
3147 for (w = w2 = anfds [i].head; w; w = w->next)
3148 {
3149 verify_watcher (EV_A_ (W)w);
3150
3151 if (j++ & 1)
3152 {
3153 assert (("libev: io watcher list contains a loop", w != w2));
3154 w2 = w2->next;
3155 }
3156
3157 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
3158 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
3159 }
3160 }
3161
3162 assert (timermax >= timercnt);
3163 verify_heap (EV_A_ timers, timercnt);
3164
3165 #if EV_PERIODIC_ENABLE
3166 assert (periodicmax >= periodiccnt);
3167 verify_heap (EV_A_ periodics, periodiccnt);
3168 #endif
3169
3170 for (i = NUMPRI; i--; )
3171 {
3172 assert (pendingmax [i] >= pendingcnt [i]);
3173 #if EV_IDLE_ENABLE
3174 assert (idleall >= 0);
3175 assert (idlemax [i] >= idlecnt [i]);
3176 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
3177 #endif
3178 }
3179
3180 #if EV_FORK_ENABLE
3181 assert (forkmax >= forkcnt);
3182 array_verify (EV_A_ (W *)forks, forkcnt);
3183 #endif
3184
3185 #if EV_CLEANUP_ENABLE
3186 assert (cleanupmax >= cleanupcnt);
3187 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
3188 #endif
3189
3190 #if EV_ASYNC_ENABLE
3191 assert (asyncmax >= asynccnt);
3192 array_verify (EV_A_ (W *)asyncs, asynccnt);
3193 #endif
3194
3195 #if EV_PREPARE_ENABLE
3196 assert (preparemax >= preparecnt);
3197 array_verify (EV_A_ (W *)prepares, preparecnt);
3198 #endif
3199
3200 #if EV_CHECK_ENABLE
3201 assert (checkmax >= checkcnt);
3202 array_verify (EV_A_ (W *)checks, checkcnt);
3203 #endif
3204
3205 # if 0
3206 #if EV_CHILD_ENABLE
3207 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
3208 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
3209 #endif
3210 # endif
3211 #endif
3212 }
3213 #endif
3214
3215 #if EV_MULTIPLICITY
3216 struct ev_loop * ecb_cold
3217 #else
3218 int
3219 #endif
ev_default_loop(unsigned int flags)3220 ev_default_loop (unsigned int flags) EV_THROW
3221 {
3222 if (!ev_default_loop_ptr)
3223 {
3224 #if EV_MULTIPLICITY
3225 EV_P = ev_default_loop_ptr = &default_loop_struct;
3226 #else
3227 ev_default_loop_ptr = 1;
3228 #endif
3229
3230 loop_init (EV_A_ flags);
3231
3232 if (ev_backend (EV_A))
3233 {
3234 #if EV_CHILD_ENABLE
3235 ev_signal_init (&childev, childcb, SIGCHLD);
3236 ev_set_priority (&childev, EV_MAXPRI);
3237 ev_signal_start (EV_A_ &childev);
3238 ev_unref (EV_A); /* child watcher should not keep loop alive */
3239 #endif
3240 }
3241 else
3242 ev_default_loop_ptr = 0;
3243 }
3244
3245 return ev_default_loop_ptr;
3246 }
3247
3248 void
ev_loop_fork(EV_P)3249 ev_loop_fork (EV_P) EV_THROW
3250 {
3251 postfork = 1;
3252 }
3253
3254 /*****************************************************************************/
3255
3256 void
ev_invoke(EV_P_ void * w,int revents)3257 ev_invoke (EV_P_ void *w, int revents)
3258 {
3259 EV_CB_INVOKE ((W)w, revents);
3260 }
3261
3262 unsigned int
ev_pending_count(EV_P)3263 ev_pending_count (EV_P) EV_THROW
3264 {
3265 int pri;
3266 unsigned int count = 0;
3267
3268 for (pri = NUMPRI; pri--; )
3269 count += pendingcnt [pri];
3270
3271 return count;
3272 }
3273
3274 void noinline
ev_invoke_pending(EV_P)3275 ev_invoke_pending (EV_P)
3276 {
3277 pendingpri = NUMPRI;
3278
3279 while (pendingpri) /* pendingpri possibly gets modified in the inner loop */
3280 {
3281 --pendingpri;
3282
3283 while (pendingcnt [pendingpri])
3284 {
3285 ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
3286
3287 p->w->pending = 0;
3288 EV_CB_INVOKE (p->w, p->events);
3289 EV_FREQUENT_CHECK;
3290 }
3291 }
3292 }
3293
3294 #if EV_IDLE_ENABLE
3295 /* make idle watchers pending. this handles the "call-idle */
3296 /* only when higher priorities are idle" logic */
3297 inline_size void
idle_reify(EV_P)3298 idle_reify (EV_P)
3299 {
3300 if (expect_false (idleall))
3301 {
3302 int pri;
3303
3304 for (pri = NUMPRI; pri--; )
3305 {
3306 if (pendingcnt [pri])
3307 break;
3308
3309 if (idlecnt [pri])
3310 {
3311 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
3312 break;
3313 }
3314 }
3315 }
3316 }
3317 #endif
3318
3319 /* make timers pending */
3320 inline_size void
timers_reify(EV_P)3321 timers_reify (EV_P)
3322 {
3323 EV_FREQUENT_CHECK;
3324
3325 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
3326 {
3327 do
3328 {
3329 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
3330
3331 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
3332
3333 /* first reschedule or stop timer */
3334 if (w->repeat)
3335 {
3336 ev_at (w) += w->repeat;
3337 if (ev_at (w) < mn_now)
3338 ev_at (w) = mn_now;
3339
3340 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
3341
3342 ANHE_at_cache (timers [HEAP0]);
3343 downheap (timers, timercnt, HEAP0);
3344 }
3345 else
3346 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
3347
3348 EV_FREQUENT_CHECK;
3349 feed_reverse (EV_A_ (W)w);
3350 }
3351 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
3352
3353 feed_reverse_done (EV_A_ EV_TIMER);
3354 }
3355 }
3356
3357 #if EV_PERIODIC_ENABLE
3358
3359 static void noinline
periodic_recalc(EV_P_ ev_periodic * w)3360 periodic_recalc (EV_P_ ev_periodic *w)
3361 {
3362 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
3363 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
3364
3365 /* the above almost always errs on the low side */
3366 while (at <= ev_rt_now)
3367 {
3368 ev_tstamp nat = at + w->interval;
3369
3370 /* when resolution fails us, we use ev_rt_now */
3371 if (expect_false (nat == at))
3372 {
3373 at = ev_rt_now;
3374 break;
3375 }
3376
3377 at = nat;
3378 }
3379
3380 ev_at (w) = at;
3381 }
3382
3383 /* make periodics pending */
3384 inline_size void
periodics_reify(EV_P)3385 periodics_reify (EV_P)
3386 {
3387 EV_FREQUENT_CHECK;
3388
3389 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
3390 {
3391 do
3392 {
3393 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
3394
3395 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
3396
3397 /* first reschedule or stop timer */
3398 if (w->reschedule_cb)
3399 {
3400 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3401
3402 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
3403
3404 ANHE_at_cache (periodics [HEAP0]);
3405 downheap (periodics, periodiccnt, HEAP0);
3406 }
3407 else if (w->interval)
3408 {
3409 periodic_recalc (EV_A_ w);
3410 ANHE_at_cache (periodics [HEAP0]);
3411 downheap (periodics, periodiccnt, HEAP0);
3412 }
3413 else
3414 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
3415
3416 EV_FREQUENT_CHECK;
3417 feed_reverse (EV_A_ (W)w);
3418 }
3419 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
3420
3421 feed_reverse_done (EV_A_ EV_PERIODIC);
3422 }
3423 }
3424
3425 /* simply recalculate all periodics */
3426 /* TODO: maybe ensure that at least one event happens when jumping forward? */
3427 static void noinline ecb_cold
periodics_reschedule(EV_P)3428 periodics_reschedule (EV_P)
3429 {
3430 int i;
3431
3432 /* adjust periodics after time jump */
3433 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
3434 {
3435 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
3436
3437 if (w->reschedule_cb)
3438 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3439 else if (w->interval)
3440 periodic_recalc (EV_A_ w);
3441
3442 ANHE_at_cache (periodics [i]);
3443 }
3444
3445 reheap (periodics, periodiccnt);
3446 }
3447 #endif
3448
3449 /* adjust all timers by a given offset */
3450 static void noinline ecb_cold
timers_reschedule(EV_P_ ev_tstamp adjust)3451 timers_reschedule (EV_P_ ev_tstamp adjust)
3452 {
3453 int i;
3454
3455 for (i = 0; i < timercnt; ++i)
3456 {
3457 ANHE *he = timers + i + HEAP0;
3458 ANHE_w (*he)->at += adjust;
3459 ANHE_at_cache (*he);
3460 }
3461 }
3462
3463 /* fetch new monotonic and realtime times from the kernel */
3464 /* also detect if there was a timejump, and act accordingly */
3465 inline_speed void
time_update(EV_P_ ev_tstamp max_block)3466 time_update (EV_P_ ev_tstamp max_block)
3467 {
3468 #if EV_USE_MONOTONIC
3469 if (expect_true (have_monotonic))
3470 {
3471 int i;
3472 ev_tstamp odiff = rtmn_diff;
3473
3474 mn_now = get_clock ();
3475
3476 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
3477 /* interpolate in the meantime */
3478 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
3479 {
3480 ev_rt_now = rtmn_diff + mn_now;
3481 return;
3482 }
3483
3484 now_floor = mn_now;
3485 ev_rt_now = ev_time ();
3486
3487 /* loop a few times, before making important decisions.
3488 * on the choice of "4": one iteration isn't enough,
3489 * in case we get preempted during the calls to
3490 * ev_time and get_clock. a second call is almost guaranteed
3491 * to succeed in that case, though. and looping a few more times
3492 * doesn't hurt either as we only do this on time-jumps or
3493 * in the unlikely event of having been preempted here.
3494 */
3495 for (i = 4; --i; )
3496 {
3497 ev_tstamp diff;
3498 rtmn_diff = ev_rt_now - mn_now;
3499
3500 diff = odiff - rtmn_diff;
3501
3502 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
3503 return; /* all is well */
3504
3505 ev_rt_now = ev_time ();
3506 mn_now = get_clock ();
3507 now_floor = mn_now;
3508 }
3509
3510 /* no timer adjustment, as the monotonic clock doesn't jump */
3511 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
3512 # if EV_PERIODIC_ENABLE
3513 periodics_reschedule (EV_A);
3514 # endif
3515 }
3516 else
3517 #endif
3518 {
3519 ev_rt_now = ev_time ();
3520
3521 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
3522 {
3523 /* adjust timers. this is easy, as the offset is the same for all of them */
3524 timers_reschedule (EV_A_ ev_rt_now - mn_now);
3525 #if EV_PERIODIC_ENABLE
3526 periodics_reschedule (EV_A);
3527 #endif
3528 }
3529
3530 mn_now = ev_rt_now;
3531 }
3532 }
3533
3534 int
ev_run(EV_P_ int flags)3535 ev_run (EV_P_ int flags)
3536 {
3537 #if EV_FEATURE_API
3538 ++loop_depth;
3539 #endif
3540
3541 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
3542
3543 loop_done = EVBREAK_CANCEL;
3544
3545 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
3546
3547 do
3548 {
3549 #if EV_VERIFY >= 2
3550 ev_verify (EV_A);
3551 #endif
3552
3553 #ifndef _WIN32
3554 if (expect_false (curpid)) /* penalise the forking check even more */
3555 if (expect_false (getpid () != curpid))
3556 {
3557 curpid = getpid ();
3558 postfork = 1;
3559 }
3560 #endif
3561
3562 #if EV_FORK_ENABLE
3563 /* we might have forked, so queue fork handlers */
3564 if (expect_false (postfork))
3565 if (forkcnt)
3566 {
3567 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
3568 EV_INVOKE_PENDING;
3569 }
3570 #endif
3571
3572 #if EV_PREPARE_ENABLE
3573 /* queue prepare watchers (and execute them) */
3574 if (expect_false (preparecnt))
3575 {
3576 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
3577 EV_INVOKE_PENDING;
3578 }
3579 #endif
3580
3581 if (expect_false (loop_done))
3582 break;
3583
3584 /* we might have forked, so reify kernel state if necessary */
3585 if (expect_false (postfork))
3586 loop_fork (EV_A);
3587
3588 /* update fd-related kernel structures */
3589 fd_reify (EV_A);
3590
3591 /* calculate blocking time */
3592 {
3593 ev_tstamp waittime = 0.;
3594 ev_tstamp sleeptime = 0.;
3595
3596 /* remember old timestamp for io_blocktime calculation */
3597 ev_tstamp prev_mn_now = mn_now;
3598
3599 /* update time to cancel out callback processing overhead */
3600 time_update (EV_A_ 1e100);
3601
3602 /* from now on, we want a pipe-wake-up */
3603 pipe_write_wanted = 1;
3604
3605 ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
3606
3607 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
3608 {
3609 waittime = MAX_BLOCKTIME;
3610
3611 if (timercnt)
3612 {
3613 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
3614 if (waittime > to) waittime = to;
3615 }
3616
3617 #if EV_PERIODIC_ENABLE
3618 if (periodiccnt)
3619 {
3620 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
3621 if (waittime > to) waittime = to;
3622 }
3623 #endif
3624
3625 /* don't let timeouts decrease the waittime below timeout_blocktime */
3626 if (expect_false (waittime < timeout_blocktime))
3627 waittime = timeout_blocktime;
3628
3629 /* at this point, we NEED to wait, so we have to ensure */
3630 /* to pass a minimum nonzero value to the backend */
3631 if (expect_false (waittime < backend_mintime))
3632 waittime = backend_mintime;
3633
3634 /* extra check because io_blocktime is commonly 0 */
3635 if (expect_false (io_blocktime))
3636 {
3637 sleeptime = io_blocktime - (mn_now - prev_mn_now);
3638
3639 if (sleeptime > waittime - backend_mintime)
3640 sleeptime = waittime - backend_mintime;
3641
3642 if (expect_true (sleeptime > 0.))
3643 {
3644 ev_sleep (sleeptime);
3645 waittime -= sleeptime;
3646 }
3647 }
3648 }
3649
3650 #if EV_FEATURE_API
3651 ++loop_count;
3652 #endif
3653 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
3654 backend_poll (EV_A_ waittime);
3655 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
3656
3657 pipe_write_wanted = 0; /* just an optimisation, no fence needed */
3658
3659 ECB_MEMORY_FENCE_ACQUIRE;
3660 if (pipe_write_skipped)
3661 {
3662 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
3663 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
3664 }
3665
3666
3667 /* update ev_rt_now, do magic */
3668 time_update (EV_A_ waittime + sleeptime);
3669 }
3670
3671 /* queue pending timers and reschedule them */
3672 timers_reify (EV_A); /* relative timers called last */
3673 #if EV_PERIODIC_ENABLE
3674 periodics_reify (EV_A); /* absolute timers called first */
3675 #endif
3676
3677 #if EV_IDLE_ENABLE
3678 /* queue idle watchers unless other events are pending */
3679 idle_reify (EV_A);
3680 #endif
3681
3682 #if EV_CHECK_ENABLE
3683 /* queue check watchers, to be executed first */
3684 if (expect_false (checkcnt))
3685 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
3686 #endif
3687
3688 EV_INVOKE_PENDING;
3689 }
3690 while (expect_true (
3691 activecnt
3692 && !loop_done
3693 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
3694 ));
3695
3696 if (loop_done == EVBREAK_ONE)
3697 loop_done = EVBREAK_CANCEL;
3698
3699 #if EV_FEATURE_API
3700 --loop_depth;
3701 #endif
3702
3703 return activecnt;
3704 }
3705
3706 void
ev_break(EV_P_ int how)3707 ev_break (EV_P_ int how) EV_THROW
3708 {
3709 loop_done = how;
3710 }
3711
3712 void
ev_ref(EV_P)3713 ev_ref (EV_P) EV_THROW
3714 {
3715 ++activecnt;
3716 }
3717
3718 void
ev_unref(EV_P)3719 ev_unref (EV_P) EV_THROW
3720 {
3721 --activecnt;
3722 }
3723
3724 void
ev_now_update(EV_P)3725 ev_now_update (EV_P) EV_THROW
3726 {
3727 time_update (EV_A_ 1e100);
3728 }
3729
3730 void
ev_suspend(EV_P)3731 ev_suspend (EV_P) EV_THROW
3732 {
3733 ev_now_update (EV_A);
3734 }
3735
3736 void
ev_resume(EV_P)3737 ev_resume (EV_P) EV_THROW
3738 {
3739 ev_tstamp mn_prev = mn_now;
3740
3741 ev_now_update (EV_A);
3742 timers_reschedule (EV_A_ mn_now - mn_prev);
3743 #if EV_PERIODIC_ENABLE
3744 /* TODO: really do this? */
3745 periodics_reschedule (EV_A);
3746 #endif
3747 }
3748
3749 /*****************************************************************************/
3750 /* singly-linked list management, used when the expected list length is short */
3751
3752 inline_size void
wlist_add(WL * head,WL elem)3753 wlist_add (WL *head, WL elem)
3754 {
3755 elem->next = *head;
3756 *head = elem;
3757 }
3758
3759 inline_size void
wlist_del(WL * head,WL elem)3760 wlist_del (WL *head, WL elem)
3761 {
3762 while (*head)
3763 {
3764 if (expect_true (*head == elem))
3765 {
3766 *head = elem->next;
3767 break;
3768 }
3769
3770 head = &(*head)->next;
3771 }
3772 }
3773
3774 /* internal, faster, version of ev_clear_pending */
3775 inline_speed void
clear_pending(EV_P_ W w)3776 clear_pending (EV_P_ W w)
3777 {
3778 if (w->pending)
3779 {
3780 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
3781 w->pending = 0;
3782 }
3783 }
3784
3785 int
ev_clear_pending(EV_P_ void * w)3786 ev_clear_pending (EV_P_ void *w) EV_THROW
3787 {
3788 W w_ = (W)w;
3789 int pending = w_->pending;
3790
3791 if (expect_true (pending))
3792 {
3793 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
3794 p->w = (W)&pending_w;
3795 w_->pending = 0;
3796 return p->events;
3797 }
3798 else
3799 return 0;
3800 }
3801
3802 inline_size void
pri_adjust(EV_P_ W w)3803 pri_adjust (EV_P_ W w)
3804 {
3805 int pri = ev_priority (w);
3806 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
3807 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
3808 ev_set_priority (w, pri);
3809 }
3810
3811 inline_speed void
ev_start(EV_P_ W w,int active)3812 ev_start (EV_P_ W w, int active)
3813 {
3814 pri_adjust (EV_A_ w);
3815 w->active = active;
3816 ev_ref (EV_A);
3817 }
3818
3819 inline_size void
ev_stop(EV_P_ W w)3820 ev_stop (EV_P_ W w)
3821 {
3822 ev_unref (EV_A);
3823 w->active = 0;
3824 }
3825
3826 /*****************************************************************************/
3827
3828 void noinline
ev_io_start(EV_P_ ev_io * w)3829 ev_io_start (EV_P_ ev_io *w) EV_THROW
3830 {
3831 int fd = w->fd;
3832
3833 if (expect_false (ev_is_active (w)))
3834 return;
3835
3836 assert (("libev: ev_io_start called with negative fd", fd >= 0));
3837 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
3838
3839 EV_FREQUENT_CHECK;
3840
3841 ev_start (EV_A_ (W)w, 1);
3842 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
3843 wlist_add (&anfds[fd].head, (WL)w);
3844
3845 /* common bug, apparently */
3846 assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
3847
3848 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
3849 w->events &= ~EV__IOFDSET;
3850
3851 EV_FREQUENT_CHECK;
3852 }
3853
3854 void noinline
ev_io_stop(EV_P_ ev_io * w)3855 ev_io_stop (EV_P_ ev_io *w) EV_THROW
3856 {
3857 clear_pending (EV_A_ (W)w);
3858 if (expect_false (!ev_is_active (w)))
3859 return;
3860
3861 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
3862
3863 EV_FREQUENT_CHECK;
3864
3865 wlist_del (&anfds[w->fd].head, (WL)w);
3866 ev_stop (EV_A_ (W)w);
3867
3868 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
3869
3870 EV_FREQUENT_CHECK;
3871 }
3872
3873 void noinline
ev_timer_start(EV_P_ ev_timer * w)3874 ev_timer_start (EV_P_ ev_timer *w) EV_THROW
3875 {
3876 if (expect_false (ev_is_active (w)))
3877 return;
3878
3879 ev_at (w) += mn_now;
3880
3881 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
3882
3883 EV_FREQUENT_CHECK;
3884
3885 ++timercnt;
3886 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
3887 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
3888 ANHE_w (timers [ev_active (w)]) = (WT)w;
3889 ANHE_at_cache (timers [ev_active (w)]);
3890 upheap (timers, ev_active (w));
3891
3892 EV_FREQUENT_CHECK;
3893
3894 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
3895 }
3896
3897 void noinline
ev_timer_stop(EV_P_ ev_timer * w)3898 ev_timer_stop (EV_P_ ev_timer *w) EV_THROW
3899 {
3900 clear_pending (EV_A_ (W)w);
3901 if (expect_false (!ev_is_active (w)))
3902 return;
3903
3904 EV_FREQUENT_CHECK;
3905
3906 {
3907 int active = ev_active (w);
3908
3909 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
3910
3911 --timercnt;
3912
3913 if (expect_true (active < timercnt + HEAP0))
3914 {
3915 timers [active] = timers [timercnt + HEAP0];
3916 adjustheap (timers, timercnt, active);
3917 }
3918 }
3919
3920 ev_at (w) -= mn_now;
3921
3922 ev_stop (EV_A_ (W)w);
3923
3924 EV_FREQUENT_CHECK;
3925 }
3926
3927 void noinline
ev_timer_again(EV_P_ ev_timer * w)3928 ev_timer_again (EV_P_ ev_timer *w) EV_THROW
3929 {
3930 EV_FREQUENT_CHECK;
3931
3932 clear_pending (EV_A_ (W)w);
3933
3934 if (ev_is_active (w))
3935 {
3936 if (w->repeat)
3937 {
3938 ev_at (w) = mn_now + w->repeat;
3939 ANHE_at_cache (timers [ev_active (w)]);
3940 adjustheap (timers, timercnt, ev_active (w));
3941 }
3942 else
3943 ev_timer_stop (EV_A_ w);
3944 }
3945 else if (w->repeat)
3946 {
3947 ev_at (w) = w->repeat;
3948 ev_timer_start (EV_A_ w);
3949 }
3950
3951 EV_FREQUENT_CHECK;
3952 }
3953
3954 ev_tstamp
ev_timer_remaining(EV_P_ ev_timer * w)3955 ev_timer_remaining (EV_P_ ev_timer *w) EV_THROW
3956 {
3957 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
3958 }
3959
3960 #if EV_PERIODIC_ENABLE
3961 void noinline
ev_periodic_start(EV_P_ ev_periodic * w)3962 ev_periodic_start (EV_P_ ev_periodic *w) EV_THROW
3963 {
3964 if (expect_false (ev_is_active (w)))
3965 return;
3966
3967 if (w->reschedule_cb)
3968 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
3969 else if (w->interval)
3970 {
3971 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
3972 periodic_recalc (EV_A_ w);
3973 }
3974 else
3975 ev_at (w) = w->offset;
3976
3977 EV_FREQUENT_CHECK;
3978
3979 ++periodiccnt;
3980 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
3981 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
3982 ANHE_w (periodics [ev_active (w)]) = (WT)w;
3983 ANHE_at_cache (periodics [ev_active (w)]);
3984 upheap (periodics, ev_active (w));
3985
3986 EV_FREQUENT_CHECK;
3987
3988 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
3989 }
3990
3991 void noinline
ev_periodic_stop(EV_P_ ev_periodic * w)3992 ev_periodic_stop (EV_P_ ev_periodic *w) EV_THROW
3993 {
3994 clear_pending (EV_A_ (W)w);
3995 if (expect_false (!ev_is_active (w)))
3996 return;
3997
3998 EV_FREQUENT_CHECK;
3999
4000 {
4001 int active = ev_active (w);
4002
4003 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
4004
4005 --periodiccnt;
4006
4007 if (expect_true (active < periodiccnt + HEAP0))
4008 {
4009 periodics [active] = periodics [periodiccnt + HEAP0];
4010 adjustheap (periodics, periodiccnt, active);
4011 }
4012 }
4013
4014 ev_stop (EV_A_ (W)w);
4015
4016 EV_FREQUENT_CHECK;
4017 }
4018
4019 void noinline
ev_periodic_again(EV_P_ ev_periodic * w)4020 ev_periodic_again (EV_P_ ev_periodic *w) EV_THROW
4021 {
4022 /* TODO: use adjustheap and recalculation */
4023 ev_periodic_stop (EV_A_ w);
4024 ev_periodic_start (EV_A_ w);
4025 }
4026 #endif
4027
4028 #ifndef SA_RESTART
4029 # define SA_RESTART 0
4030 #endif
4031
4032 #if EV_SIGNAL_ENABLE
4033
4034 void noinline
ev_signal_start(EV_P_ ev_signal * w)4035 ev_signal_start (EV_P_ ev_signal *w) EV_THROW
4036 {
4037 if (expect_false (ev_is_active (w)))
4038 return;
4039
4040 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
4041
4042 #if EV_MULTIPLICITY
4043 assert (("libev: a signal must not be attached to two different loops",
4044 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
4045
4046 signals [w->signum - 1].loop = EV_A;
4047 ECB_MEMORY_FENCE_RELEASE;
4048 #endif
4049
4050 EV_FREQUENT_CHECK;
4051
4052 #if EV_USE_SIGNALFD
4053 if (sigfd == -2)
4054 {
4055 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
4056 if (sigfd < 0 && errno == EINVAL)
4057 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
4058
4059 if (sigfd >= 0)
4060 {
4061 fd_intern (sigfd); /* doing it twice will not hurt */
4062
4063 sigemptyset (&sigfd_set);
4064
4065 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
4066 ev_set_priority (&sigfd_w, EV_MAXPRI);
4067 ev_io_start (EV_A_ &sigfd_w);
4068 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
4069 }
4070 }
4071
4072 if (sigfd >= 0)
4073 {
4074 /* TODO: check .head */
4075 sigaddset (&sigfd_set, w->signum);
4076 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
4077
4078 signalfd (sigfd, &sigfd_set, 0);
4079 }
4080 #endif
4081
4082 ev_start (EV_A_ (W)w, 1);
4083 wlist_add (&signals [w->signum - 1].head, (WL)w);
4084
4085 if (!((WL)w)->next)
4086 # if EV_USE_SIGNALFD
4087 if (sigfd < 0) /*TODO*/
4088 # endif
4089 {
4090 # ifdef _WIN32
4091 evpipe_init (EV_A);
4092
4093 signal (w->signum, ev_sighandler);
4094 # else
4095 struct sigaction sa;
4096
4097 evpipe_init (EV_A);
4098
4099 sa.sa_handler = ev_sighandler;
4100 sigfillset (&sa.sa_mask);
4101 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
4102 sigaction (w->signum, &sa, 0);
4103
4104 if (origflags & EVFLAG_NOSIGMASK)
4105 {
4106 sigemptyset (&sa.sa_mask);
4107 sigaddset (&sa.sa_mask, w->signum);
4108 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
4109 }
4110 #endif
4111 }
4112
4113 EV_FREQUENT_CHECK;
4114 }
4115
4116 void noinline
ev_signal_stop(EV_P_ ev_signal * w)4117 ev_signal_stop (EV_P_ ev_signal *w) EV_THROW
4118 {
4119 clear_pending (EV_A_ (W)w);
4120 if (expect_false (!ev_is_active (w)))
4121 return;
4122
4123 EV_FREQUENT_CHECK;
4124
4125 wlist_del (&signals [w->signum - 1].head, (WL)w);
4126 ev_stop (EV_A_ (W)w);
4127
4128 if (!signals [w->signum - 1].head)
4129 {
4130 #if EV_MULTIPLICITY
4131 signals [w->signum - 1].loop = 0; /* unattach from signal */
4132 #endif
4133 #if EV_USE_SIGNALFD
4134 if (sigfd >= 0)
4135 {
4136 sigset_t ss;
4137
4138 sigemptyset (&ss);
4139 sigaddset (&ss, w->signum);
4140 sigdelset (&sigfd_set, w->signum);
4141
4142 signalfd (sigfd, &sigfd_set, 0);
4143 sigprocmask (SIG_UNBLOCK, &ss, 0);
4144 }
4145 else
4146 #endif
4147 signal (w->signum, SIG_DFL);
4148 }
4149
4150 EV_FREQUENT_CHECK;
4151 }
4152
4153 #endif
4154
4155 #if EV_CHILD_ENABLE
4156
4157 void
ev_child_start(EV_P_ ev_child * w)4158 ev_child_start (EV_P_ ev_child *w) EV_THROW
4159 {
4160 #if EV_MULTIPLICITY
4161 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
4162 #endif
4163 if (expect_false (ev_is_active (w)))
4164 return;
4165
4166 EV_FREQUENT_CHECK;
4167
4168 ev_start (EV_A_ (W)w, 1);
4169 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
4170
4171 EV_FREQUENT_CHECK;
4172 }
4173
4174 void
ev_child_stop(EV_P_ ev_child * w)4175 ev_child_stop (EV_P_ ev_child *w) EV_THROW
4176 {
4177 clear_pending (EV_A_ (W)w);
4178 if (expect_false (!ev_is_active (w)))
4179 return;
4180
4181 EV_FREQUENT_CHECK;
4182
4183 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
4184 ev_stop (EV_A_ (W)w);
4185
4186 EV_FREQUENT_CHECK;
4187 }
4188
4189 #endif
4190
4191 #if EV_STAT_ENABLE
4192
4193 # ifdef _WIN32
4194 # undef lstat
4195 # define lstat(a,b) _stati64 (a,b)
4196 # endif
4197
4198 #define DEF_STAT_INTERVAL 5.0074891
4199 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
4200 #define MIN_STAT_INTERVAL 0.1074891
4201
4202 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
4203
4204 #if EV_USE_INOTIFY
4205
4206 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
4207 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
4208
4209 static void noinline
infy_add(EV_P_ ev_stat * w)4210 infy_add (EV_P_ ev_stat *w)
4211 {
4212 w->wd = inotify_add_watch (fs_fd, w->path,
4213 IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY
4214 | IN_CREATE | IN_DELETE | IN_MOVED_FROM | IN_MOVED_TO
4215 | IN_DONT_FOLLOW | IN_MASK_ADD);
4216
4217 if (w->wd >= 0)
4218 {
4219 struct statfs sfs;
4220
4221 /* now local changes will be tracked by inotify, but remote changes won't */
4222 /* unless the filesystem is known to be local, we therefore still poll */
4223 /* also do poll on <2.6.25, but with normal frequency */
4224
4225 if (!fs_2625)
4226 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
4227 else if (!statfs (w->path, &sfs)
4228 && (sfs.f_type == 0x1373 /* devfs */
4229 || sfs.f_type == 0x4006 /* fat */
4230 || sfs.f_type == 0x4d44 /* msdos */
4231 || sfs.f_type == 0xEF53 /* ext2/3 */
4232 || sfs.f_type == 0x72b6 /* jffs2 */
4233 || sfs.f_type == 0x858458f6 /* ramfs */
4234 || sfs.f_type == 0x5346544e /* ntfs */
4235 || sfs.f_type == 0x3153464a /* jfs */
4236 || sfs.f_type == 0x9123683e /* btrfs */
4237 || sfs.f_type == 0x52654973 /* reiser3 */
4238 || sfs.f_type == 0x01021994 /* tmpfs */
4239 || sfs.f_type == 0x58465342 /* xfs */))
4240 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
4241 else
4242 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
4243 }
4244 else
4245 {
4246 /* can't use inotify, continue to stat */
4247 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
4248
4249 /* if path is not there, monitor some parent directory for speedup hints */
4250 /* note that exceeding the hardcoded path limit is not a correctness issue, */
4251 /* but an efficiency issue only */
4252 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
4253 {
4254 char path [4096];
4255 strcpy (path, w->path);
4256
4257 do
4258 {
4259 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
4260 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
4261
4262 char *pend = strrchr (path, '/');
4263
4264 if (!pend || pend == path)
4265 break;
4266
4267 *pend = 0;
4268 w->wd = inotify_add_watch (fs_fd, path, mask);
4269 }
4270 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
4271 }
4272 }
4273
4274 if (w->wd >= 0)
4275 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
4276
4277 /* now re-arm timer, if required */
4278 if (ev_is_active (&w->timer)) ev_ref (EV_A);
4279 ev_timer_again (EV_A_ &w->timer);
4280 if (ev_is_active (&w->timer)) ev_unref (EV_A);
4281 }
4282
4283 static void noinline
infy_del(EV_P_ ev_stat * w)4284 infy_del (EV_P_ ev_stat *w)
4285 {
4286 int slot;
4287 int wd = w->wd;
4288
4289 if (wd < 0)
4290 return;
4291
4292 w->wd = -2;
4293 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
4294 wlist_del (&fs_hash [slot].head, (WL)w);
4295
4296 /* remove this watcher, if others are watching it, they will rearm */
4297 inotify_rm_watch (fs_fd, wd);
4298 }
4299
4300 static void noinline
infy_wd(EV_P_ int slot,int wd,struct inotify_event * ev)4301 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
4302 {
4303 if (slot < 0)
4304 /* overflow, need to check for all hash slots */
4305 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
4306 infy_wd (EV_A_ slot, wd, ev);
4307 else
4308 {
4309 WL w_;
4310
4311 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
4312 {
4313 ev_stat *w = (ev_stat *)w_;
4314 w_ = w_->next; /* lets us remove this watcher and all before it */
4315
4316 if (w->wd == wd || wd == -1)
4317 {
4318 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
4319 {
4320 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
4321 w->wd = -1;
4322 infy_add (EV_A_ w); /* re-add, no matter what */
4323 }
4324
4325 stat_timer_cb (EV_A_ &w->timer, 0);
4326 }
4327 }
4328 }
4329 }
4330
4331 static void
infy_cb(EV_P_ ev_io * w,int revents)4332 infy_cb (EV_P_ ev_io *w, int revents)
4333 {
4334 char buf [EV_INOTIFY_BUFSIZE];
4335 int ofs;
4336 int len = read (fs_fd, buf, sizeof (buf));
4337
4338 for (ofs = 0; ofs < len; )
4339 {
4340 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
4341 infy_wd (EV_A_ ev->wd, ev->wd, ev);
4342 ofs += sizeof (struct inotify_event) + ev->len;
4343 }
4344 }
4345
4346 inline_size void ecb_cold
ev_check_2625(EV_P)4347 ev_check_2625 (EV_P)
4348 {
4349 /* kernels < 2.6.25 are borked
4350 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
4351 */
4352 if (ev_linux_version () < 0x020619)
4353 return;
4354
4355 fs_2625 = 1;
4356 }
4357
4358 inline_size int
infy_newfd(void)4359 infy_newfd (void)
4360 {
4361 #if defined IN_CLOEXEC && defined IN_NONBLOCK
4362 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
4363 if (fd >= 0)
4364 return fd;
4365 #endif
4366 return inotify_init ();
4367 }
4368
4369 inline_size void
infy_init(EV_P)4370 infy_init (EV_P)
4371 {
4372 if (fs_fd != -2)
4373 return;
4374
4375 fs_fd = -1;
4376
4377 ev_check_2625 (EV_A);
4378
4379 fs_fd = infy_newfd ();
4380
4381 if (fs_fd >= 0)
4382 {
4383 fd_intern (fs_fd);
4384 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
4385 ev_set_priority (&fs_w, EV_MAXPRI);
4386 ev_io_start (EV_A_ &fs_w);
4387 ev_unref (EV_A);
4388 }
4389 }
4390
4391 inline_size void
infy_fork(EV_P)4392 infy_fork (EV_P)
4393 {
4394 int slot;
4395
4396 if (fs_fd < 0)
4397 return;
4398
4399 ev_ref (EV_A);
4400 ev_io_stop (EV_A_ &fs_w);
4401 close (fs_fd);
4402 fs_fd = infy_newfd ();
4403
4404 if (fs_fd >= 0)
4405 {
4406 fd_intern (fs_fd);
4407 ev_io_set (&fs_w, fs_fd, EV_READ);
4408 ev_io_start (EV_A_ &fs_w);
4409 ev_unref (EV_A);
4410 }
4411
4412 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
4413 {
4414 WL w_ = fs_hash [slot].head;
4415 fs_hash [slot].head = 0;
4416
4417 while (w_)
4418 {
4419 ev_stat *w = (ev_stat *)w_;
4420 w_ = w_->next; /* lets us add this watcher */
4421
4422 w->wd = -1;
4423
4424 if (fs_fd >= 0)
4425 infy_add (EV_A_ w); /* re-add, no matter what */
4426 else
4427 {
4428 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
4429 if (ev_is_active (&w->timer)) ev_ref (EV_A);
4430 ev_timer_again (EV_A_ &w->timer);
4431 if (ev_is_active (&w->timer)) ev_unref (EV_A);
4432 }
4433 }
4434 }
4435 }
4436
4437 #endif
4438
4439 #ifdef _WIN32
4440 # define EV_LSTAT(p,b) _stati64 (p, b)
4441 #else
4442 # define EV_LSTAT(p,b) lstat (p, b)
4443 #endif
4444
4445 void
ev_stat_stat(EV_P_ ev_stat * w)4446 ev_stat_stat (EV_P_ ev_stat *w) EV_THROW
4447 {
4448 if (lstat (w->path, &w->attr) < 0)
4449 w->attr.st_nlink = 0;
4450 else if (!w->attr.st_nlink)
4451 w->attr.st_nlink = 1;
4452 }
4453
4454 static void noinline
stat_timer_cb(EV_P_ ev_timer * w_,int revents)4455 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
4456 {
4457 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
4458
4459 ev_statdata prev = w->attr;
4460 ev_stat_stat (EV_A_ w);
4461
4462 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
4463 if (
4464 prev.st_dev != w->attr.st_dev
4465 || prev.st_ino != w->attr.st_ino
4466 || prev.st_mode != w->attr.st_mode
4467 || prev.st_nlink != w->attr.st_nlink
4468 || prev.st_uid != w->attr.st_uid
4469 || prev.st_gid != w->attr.st_gid
4470 || prev.st_rdev != w->attr.st_rdev
4471 || prev.st_size != w->attr.st_size
4472 || prev.st_atime != w->attr.st_atime
4473 || prev.st_mtime != w->attr.st_mtime
4474 || prev.st_ctime != w->attr.st_ctime
4475 ) {
4476 /* we only update w->prev on actual differences */
4477 /* in case we test more often than invoke the callback, */
4478 /* to ensure that prev is always different to attr */
4479 w->prev = prev;
4480
4481 #if EV_USE_INOTIFY
4482 if (fs_fd >= 0)
4483 {
4484 infy_del (EV_A_ w);
4485 infy_add (EV_A_ w);
4486 ev_stat_stat (EV_A_ w); /* avoid race... */
4487 }
4488 #endif
4489
4490 ev_feed_event (EV_A_ w, EV_STAT);
4491 }
4492 }
4493
4494 void
ev_stat_start(EV_P_ ev_stat * w)4495 ev_stat_start (EV_P_ ev_stat *w) EV_THROW
4496 {
4497 if (expect_false (ev_is_active (w)))
4498 return;
4499
4500 ev_stat_stat (EV_A_ w);
4501
4502 if (w->interval < MIN_STAT_INTERVAL && w->interval)
4503 w->interval = MIN_STAT_INTERVAL;
4504
4505 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
4506 ev_set_priority (&w->timer, ev_priority (w));
4507
4508 #if EV_USE_INOTIFY
4509 infy_init (EV_A);
4510
4511 if (fs_fd >= 0)
4512 infy_add (EV_A_ w);
4513 else
4514 #endif
4515 {
4516 ev_timer_again (EV_A_ &w->timer);
4517 ev_unref (EV_A);
4518 }
4519
4520 ev_start (EV_A_ (W)w, 1);
4521
4522 EV_FREQUENT_CHECK;
4523 }
4524
4525 void
ev_stat_stop(EV_P_ ev_stat * w)4526 ev_stat_stop (EV_P_ ev_stat *w) EV_THROW
4527 {
4528 clear_pending (EV_A_ (W)w);
4529 if (expect_false (!ev_is_active (w)))
4530 return;
4531
4532 EV_FREQUENT_CHECK;
4533
4534 #if EV_USE_INOTIFY
4535 infy_del (EV_A_ w);
4536 #endif
4537
4538 if (ev_is_active (&w->timer))
4539 {
4540 ev_ref (EV_A);
4541 ev_timer_stop (EV_A_ &w->timer);
4542 }
4543
4544 ev_stop (EV_A_ (W)w);
4545
4546 EV_FREQUENT_CHECK;
4547 }
4548 #endif
4549
4550 #if EV_IDLE_ENABLE
4551 void
ev_idle_start(EV_P_ ev_idle * w)4552 ev_idle_start (EV_P_ ev_idle *w) EV_THROW
4553 {
4554 if (expect_false (ev_is_active (w)))
4555 return;
4556
4557 pri_adjust (EV_A_ (W)w);
4558
4559 EV_FREQUENT_CHECK;
4560
4561 {
4562 int active = ++idlecnt [ABSPRI (w)];
4563
4564 ++idleall;
4565 ev_start (EV_A_ (W)w, active);
4566
4567 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
4568 idles [ABSPRI (w)][active - 1] = w;
4569 }
4570
4571 EV_FREQUENT_CHECK;
4572 }
4573
4574 void
ev_idle_stop(EV_P_ ev_idle * w)4575 ev_idle_stop (EV_P_ ev_idle *w) EV_THROW
4576 {
4577 clear_pending (EV_A_ (W)w);
4578 if (expect_false (!ev_is_active (w)))
4579 return;
4580
4581 EV_FREQUENT_CHECK;
4582
4583 {
4584 int active = ev_active (w);
4585
4586 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
4587 ev_active (idles [ABSPRI (w)][active - 1]) = active;
4588
4589 ev_stop (EV_A_ (W)w);
4590 --idleall;
4591 }
4592
4593 EV_FREQUENT_CHECK;
4594 }
4595 #endif
4596
4597 #if EV_PREPARE_ENABLE
4598 void
ev_prepare_start(EV_P_ ev_prepare * w)4599 ev_prepare_start (EV_P_ ev_prepare *w) EV_THROW
4600 {
4601 if (expect_false (ev_is_active (w)))
4602 return;
4603
4604 EV_FREQUENT_CHECK;
4605
4606 ev_start (EV_A_ (W)w, ++preparecnt);
4607 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
4608 prepares [preparecnt - 1] = w;
4609
4610 EV_FREQUENT_CHECK;
4611 }
4612
4613 void
ev_prepare_stop(EV_P_ ev_prepare * w)4614 ev_prepare_stop (EV_P_ ev_prepare *w) EV_THROW
4615 {
4616 clear_pending (EV_A_ (W)w);
4617 if (expect_false (!ev_is_active (w)))
4618 return;
4619
4620 EV_FREQUENT_CHECK;
4621
4622 {
4623 int active = ev_active (w);
4624
4625 prepares [active - 1] = prepares [--preparecnt];
4626 ev_active (prepares [active - 1]) = active;
4627 }
4628
4629 ev_stop (EV_A_ (W)w);
4630
4631 EV_FREQUENT_CHECK;
4632 }
4633 #endif
4634
4635 #if EV_CHECK_ENABLE
4636 void
ev_check_start(EV_P_ ev_check * w)4637 ev_check_start (EV_P_ ev_check *w) EV_THROW
4638 {
4639 if (expect_false (ev_is_active (w)))
4640 return;
4641
4642 EV_FREQUENT_CHECK;
4643
4644 ev_start (EV_A_ (W)w, ++checkcnt);
4645 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
4646 checks [checkcnt - 1] = w;
4647
4648 EV_FREQUENT_CHECK;
4649 }
4650
4651 void
ev_check_stop(EV_P_ ev_check * w)4652 ev_check_stop (EV_P_ ev_check *w) EV_THROW
4653 {
4654 clear_pending (EV_A_ (W)w);
4655 if (expect_false (!ev_is_active (w)))
4656 return;
4657
4658 EV_FREQUENT_CHECK;
4659
4660 {
4661 int active = ev_active (w);
4662
4663 checks [active - 1] = checks [--checkcnt];
4664 ev_active (checks [active - 1]) = active;
4665 }
4666
4667 ev_stop (EV_A_ (W)w);
4668
4669 EV_FREQUENT_CHECK;
4670 }
4671 #endif
4672
4673 #if EV_EMBED_ENABLE
4674 void noinline
ev_embed_sweep(EV_P_ ev_embed * w)4675 ev_embed_sweep (EV_P_ ev_embed *w) EV_THROW
4676 {
4677 ev_run (w->other, EVRUN_NOWAIT);
4678 }
4679
4680 static void
embed_io_cb(EV_P_ ev_io * io,int revents)4681 embed_io_cb (EV_P_ ev_io *io, int revents)
4682 {
4683 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
4684
4685 if (ev_cb (w))
4686 ev_feed_event (EV_A_ (W)w, EV_EMBED);
4687 else
4688 ev_run (w->other, EVRUN_NOWAIT);
4689 }
4690
4691 static void
embed_prepare_cb(EV_P_ ev_prepare * prepare,int revents)4692 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
4693 {
4694 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
4695
4696 {
4697 EV_P = w->other;
4698
4699 while (fdchangecnt)
4700 {
4701 fd_reify (EV_A);
4702 ev_run (EV_A_ EVRUN_NOWAIT);
4703 }
4704 }
4705 }
4706
4707 static void
embed_fork_cb(EV_P_ ev_fork * fork_w,int revents)4708 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
4709 {
4710 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
4711
4712 ev_embed_stop (EV_A_ w);
4713
4714 {
4715 EV_P = w->other;
4716
4717 ev_loop_fork (EV_A);
4718 ev_run (EV_A_ EVRUN_NOWAIT);
4719 }
4720
4721 ev_embed_start (EV_A_ w);
4722 }
4723
4724 #if 0
4725 static void
4726 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
4727 {
4728 ev_idle_stop (EV_A_ idle);
4729 }
4730 #endif
4731
4732 void
ev_embed_start(EV_P_ ev_embed * w)4733 ev_embed_start (EV_P_ ev_embed *w) EV_THROW
4734 {
4735 if (expect_false (ev_is_active (w)))
4736 return;
4737
4738 {
4739 EV_P = w->other;
4740 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
4741 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
4742 }
4743
4744 EV_FREQUENT_CHECK;
4745
4746 ev_set_priority (&w->io, ev_priority (w));
4747 ev_io_start (EV_A_ &w->io);
4748
4749 ev_prepare_init (&w->prepare, embed_prepare_cb);
4750 ev_set_priority (&w->prepare, EV_MINPRI);
4751 ev_prepare_start (EV_A_ &w->prepare);
4752
4753 ev_fork_init (&w->fork, embed_fork_cb);
4754 ev_fork_start (EV_A_ &w->fork);
4755
4756 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
4757
4758 ev_start (EV_A_ (W)w, 1);
4759
4760 EV_FREQUENT_CHECK;
4761 }
4762
4763 void
ev_embed_stop(EV_P_ ev_embed * w)4764 ev_embed_stop (EV_P_ ev_embed *w) EV_THROW
4765 {
4766 clear_pending (EV_A_ (W)w);
4767 if (expect_false (!ev_is_active (w)))
4768 return;
4769
4770 EV_FREQUENT_CHECK;
4771
4772 ev_io_stop (EV_A_ &w->io);
4773 ev_prepare_stop (EV_A_ &w->prepare);
4774 ev_fork_stop (EV_A_ &w->fork);
4775
4776 ev_stop (EV_A_ (W)w);
4777
4778 EV_FREQUENT_CHECK;
4779 }
4780 #endif
4781
4782 #if EV_FORK_ENABLE
4783 void
ev_fork_start(EV_P_ ev_fork * w)4784 ev_fork_start (EV_P_ ev_fork *w) EV_THROW
4785 {
4786 if (expect_false (ev_is_active (w)))
4787 return;
4788
4789 EV_FREQUENT_CHECK;
4790
4791 ev_start (EV_A_ (W)w, ++forkcnt);
4792 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
4793 forks [forkcnt - 1] = w;
4794
4795 EV_FREQUENT_CHECK;
4796 }
4797
4798 void
ev_fork_stop(EV_P_ ev_fork * w)4799 ev_fork_stop (EV_P_ ev_fork *w) EV_THROW
4800 {
4801 clear_pending (EV_A_ (W)w);
4802 if (expect_false (!ev_is_active (w)))
4803 return;
4804
4805 EV_FREQUENT_CHECK;
4806
4807 {
4808 int active = ev_active (w);
4809
4810 forks [active - 1] = forks [--forkcnt];
4811 ev_active (forks [active - 1]) = active;
4812 }
4813
4814 ev_stop (EV_A_ (W)w);
4815
4816 EV_FREQUENT_CHECK;
4817 }
4818 #endif
4819
4820 #if EV_CLEANUP_ENABLE
4821 void
ev_cleanup_start(EV_P_ ev_cleanup * w)4822 ev_cleanup_start (EV_P_ ev_cleanup *w) EV_THROW
4823 {
4824 if (expect_false (ev_is_active (w)))
4825 return;
4826
4827 EV_FREQUENT_CHECK;
4828
4829 ev_start (EV_A_ (W)w, ++cleanupcnt);
4830 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
4831 cleanups [cleanupcnt - 1] = w;
4832
4833 /* cleanup watchers should never keep a refcount on the loop */
4834 ev_unref (EV_A);
4835 EV_FREQUENT_CHECK;
4836 }
4837
4838 void
ev_cleanup_stop(EV_P_ ev_cleanup * w)4839 ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_THROW
4840 {
4841 clear_pending (EV_A_ (W)w);
4842 if (expect_false (!ev_is_active (w)))
4843 return;
4844
4845 EV_FREQUENT_CHECK;
4846 ev_ref (EV_A);
4847
4848 {
4849 int active = ev_active (w);
4850
4851 cleanups [active - 1] = cleanups [--cleanupcnt];
4852 ev_active (cleanups [active - 1]) = active;
4853 }
4854
4855 ev_stop (EV_A_ (W)w);
4856
4857 EV_FREQUENT_CHECK;
4858 }
4859 #endif
4860
4861 #if EV_ASYNC_ENABLE
4862 void
ev_async_start(EV_P_ ev_async * w)4863 ev_async_start (EV_P_ ev_async *w) EV_THROW
4864 {
4865 if (expect_false (ev_is_active (w)))
4866 return;
4867
4868 w->sent = 0;
4869
4870 evpipe_init (EV_A);
4871
4872 EV_FREQUENT_CHECK;
4873
4874 ev_start (EV_A_ (W)w, ++asynccnt);
4875 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
4876 asyncs [asynccnt - 1] = w;
4877
4878 EV_FREQUENT_CHECK;
4879 }
4880
4881 void
ev_async_stop(EV_P_ ev_async * w)4882 ev_async_stop (EV_P_ ev_async *w) EV_THROW
4883 {
4884 clear_pending (EV_A_ (W)w);
4885 if (expect_false (!ev_is_active (w)))
4886 return;
4887
4888 EV_FREQUENT_CHECK;
4889
4890 {
4891 int active = ev_active (w);
4892
4893 asyncs [active - 1] = asyncs [--asynccnt];
4894 ev_active (asyncs [active - 1]) = active;
4895 }
4896
4897 ev_stop (EV_A_ (W)w);
4898
4899 EV_FREQUENT_CHECK;
4900 }
4901
4902 void
ev_async_send(EV_P_ ev_async * w)4903 ev_async_send (EV_P_ ev_async *w) EV_THROW
4904 {
4905 w->sent = 1;
4906 evpipe_write (EV_A_ &async_pending);
4907 }
4908 #endif
4909
4910 /*****************************************************************************/
4911
4912 struct ev_once
4913 {
4914 ev_io io;
4915 ev_timer to;
4916 void (*cb)(int revents, void *arg);
4917 void *arg;
4918 };
4919
4920 static void
once_cb(EV_P_ struct ev_once * once,int revents)4921 once_cb (EV_P_ struct ev_once *once, int revents)
4922 {
4923 void (*cb)(int revents, void *arg) = once->cb;
4924 void *arg = once->arg;
4925
4926 ev_io_stop (EV_A_ &once->io);
4927 ev_timer_stop (EV_A_ &once->to);
4928 ev_free (once);
4929
4930 cb (revents, arg);
4931 }
4932
4933 static void
once_cb_io(EV_P_ ev_io * w,int revents)4934 once_cb_io (EV_P_ ev_io *w, int revents)
4935 {
4936 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
4937
4938 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
4939 }
4940
4941 static void
once_cb_to(EV_P_ ev_timer * w,int revents)4942 once_cb_to (EV_P_ ev_timer *w, int revents)
4943 {
4944 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
4945
4946 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
4947 }
4948
4949 void
ev_once(EV_P_ int fd,int events,ev_tstamp timeout,void (* cb)(int revents,void * arg),void * arg)4950 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) EV_THROW
4951 {
4952 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
4953
4954 if (expect_false (!once))
4955 {
4956 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
4957 return;
4958 }
4959
4960 once->cb = cb;
4961 once->arg = arg;
4962
4963 ev_init (&once->io, once_cb_io);
4964 if (fd >= 0)
4965 {
4966 ev_io_set (&once->io, fd, events);
4967 ev_io_start (EV_A_ &once->io);
4968 }
4969
4970 ev_init (&once->to, once_cb_to);
4971 if (timeout >= 0.)
4972 {
4973 ev_timer_set (&once->to, timeout, 0.);
4974 ev_timer_start (EV_A_ &once->to);
4975 }
4976 }
4977
4978 /*****************************************************************************/
4979
4980 #if EV_WALK_ENABLE
4981 void ecb_cold
ev_walk(EV_P_ int types,void (* cb)(EV_P_ int type,void * w))4982 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w)) EV_THROW
4983 {
4984 int i, j;
4985 ev_watcher_list *wl, *wn;
4986
4987 if (types & (EV_IO | EV_EMBED))
4988 for (i = 0; i < anfdmax; ++i)
4989 for (wl = anfds [i].head; wl; )
4990 {
4991 wn = wl->next;
4992
4993 #if EV_EMBED_ENABLE
4994 if (ev_cb ((ev_io *)wl) == embed_io_cb)
4995 {
4996 if (types & EV_EMBED)
4997 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
4998 }
4999 else
5000 #endif
5001 #if EV_USE_INOTIFY
5002 if (ev_cb ((ev_io *)wl) == infy_cb)
5003 ;
5004 else
5005 #endif
5006 if ((ev_io *)wl != &pipe_w)
5007 if (types & EV_IO)
5008 cb (EV_A_ EV_IO, wl);
5009
5010 wl = wn;
5011 }
5012
5013 if (types & (EV_TIMER | EV_STAT))
5014 for (i = timercnt + HEAP0; i-- > HEAP0; )
5015 #if EV_STAT_ENABLE
5016 /*TODO: timer is not always active*/
5017 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
5018 {
5019 if (types & EV_STAT)
5020 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
5021 }
5022 else
5023 #endif
5024 if (types & EV_TIMER)
5025 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
5026
5027 #if EV_PERIODIC_ENABLE
5028 if (types & EV_PERIODIC)
5029 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
5030 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
5031 #endif
5032
5033 #if EV_IDLE_ENABLE
5034 if (types & EV_IDLE)
5035 for (j = NUMPRI; j--; )
5036 for (i = idlecnt [j]; i--; )
5037 cb (EV_A_ EV_IDLE, idles [j][i]);
5038 #endif
5039
5040 #if EV_FORK_ENABLE
5041 if (types & EV_FORK)
5042 for (i = forkcnt; i--; )
5043 if (ev_cb (forks [i]) != embed_fork_cb)
5044 cb (EV_A_ EV_FORK, forks [i]);
5045 #endif
5046
5047 #if EV_ASYNC_ENABLE
5048 if (types & EV_ASYNC)
5049 for (i = asynccnt; i--; )
5050 cb (EV_A_ EV_ASYNC, asyncs [i]);
5051 #endif
5052
5053 #if EV_PREPARE_ENABLE
5054 if (types & EV_PREPARE)
5055 for (i = preparecnt; i--; )
5056 # if EV_EMBED_ENABLE
5057 if (ev_cb (prepares [i]) != embed_prepare_cb)
5058 # endif
5059 cb (EV_A_ EV_PREPARE, prepares [i]);
5060 #endif
5061
5062 #if EV_CHECK_ENABLE
5063 if (types & EV_CHECK)
5064 for (i = checkcnt; i--; )
5065 cb (EV_A_ EV_CHECK, checks [i]);
5066 #endif
5067
5068 #if EV_SIGNAL_ENABLE
5069 if (types & EV_SIGNAL)
5070 for (i = 0; i < EV_NSIG - 1; ++i)
5071 for (wl = signals [i].head; wl; )
5072 {
5073 wn = wl->next;
5074 cb (EV_A_ EV_SIGNAL, wl);
5075 wl = wn;
5076 }
5077 #endif
5078
5079 #if EV_CHILD_ENABLE
5080 if (types & EV_CHILD)
5081 for (i = (EV_PID_HASHSIZE); i--; )
5082 for (wl = childs [i]; wl; )
5083 {
5084 wn = wl->next;
5085 cb (EV_A_ EV_CHILD, wl);
5086 wl = wn;
5087 }
5088 #endif
5089 /* EV_STAT 0x00001000 /* stat data changed */
5090 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
5091 }
5092 #endif
5093
5094 #if EV_MULTIPLICITY
5095 #include "ev_wrap.h"
5096 #endif
5097
5098