1 /* 2 * z_Linux_util.cpp -- platform specific routines. 3 */ 4 5 //===----------------------------------------------------------------------===// 6 // 7 // The LLVM Compiler Infrastructure 8 // 9 // This file is dual licensed under the MIT and the University of Illinois Open 10 // Source Licenses. See LICENSE.txt for details. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "kmp.h" 15 #include "kmp_affinity.h" 16 #include "kmp_i18n.h" 17 #include "kmp_io.h" 18 #include "kmp_itt.h" 19 #include "kmp_lock.h" 20 #include "kmp_stats.h" 21 #include "kmp_str.h" 22 #include "kmp_wait_release.h" 23 #include "kmp_wrapper_getpid.h" 24 25 #if !KMP_OS_DRAGONFLY && !KMP_OS_FREEBSD && !KMP_OS_NETBSD && !KMP_OS_OPENBSD 26 #include <alloca.h> 27 #endif 28 #include <math.h> // HUGE_VAL. 29 #include <sys/resource.h> 30 #include <sys/syscall.h> 31 #include <sys/time.h> 32 #include <sys/times.h> 33 #include <unistd.h> 34 35 #if KMP_OS_LINUX && !KMP_OS_CNK 36 #include <sys/sysinfo.h> 37 #if KMP_USE_FUTEX 38 // We should really include <futex.h>, but that causes compatibility problems on 39 // different Linux* OS distributions that either require that you include (or 40 // break when you try to include) <pci/types.h>. Since all we need is the two 41 // macros below (which are part of the kernel ABI, so can't change) we just 42 // define the constants here and don't include <futex.h> 43 #ifndef FUTEX_WAIT 44 #define FUTEX_WAIT 0 45 #endif 46 #ifndef FUTEX_WAKE 47 #define FUTEX_WAKE 1 48 #endif 49 #endif 50 #elif KMP_OS_DARWIN 51 #include <mach/mach.h> 52 #include <sys/sysctl.h> 53 #elif KMP_OS_DRAGONFLY || KMP_OS_FREEBSD 54 #include <pthread_np.h> 55 #elif KMP_OS_NETBSD 56 #include <sys/types.h> 57 #include <sys/sysctl.h> 58 #endif 59 60 #include <ctype.h> 61 #include <dirent.h> 62 #include <fcntl.h> 63 64 #include "tsan_annotations.h" 65 66 struct kmp_sys_timer { 67 struct timespec start; 68 }; 69 70 // Convert timespec to nanoseconds. 71 #define TS2NS(timespec) (((timespec).tv_sec * 1e9) + (timespec).tv_nsec) 72 73 static struct kmp_sys_timer __kmp_sys_timer_data; 74 75 #if KMP_HANDLE_SIGNALS 76 typedef void (*sig_func_t)(int); 77 STATIC_EFI2_WORKAROUND struct sigaction __kmp_sighldrs[NSIG]; 78 static sigset_t __kmp_sigset; 79 #endif 80 81 static int __kmp_init_runtime = FALSE; 82 83 static int __kmp_fork_count = 0; 84 85 static pthread_condattr_t __kmp_suspend_cond_attr; 86 static pthread_mutexattr_t __kmp_suspend_mutex_attr; 87 88 static kmp_cond_align_t __kmp_wait_cv; 89 static kmp_mutex_align_t __kmp_wait_mx; 90 91 kmp_uint64 __kmp_ticks_per_msec = 1000000; 92 93 #ifdef DEBUG_SUSPEND 94 static void __kmp_print_cond(char *buffer, kmp_cond_align_t *cond) { 95 KMP_SNPRINTF(buffer, 128, "(cond (lock (%ld, %d)), (descr (%p)))", 96 cond->c_cond.__c_lock.__status, cond->c_cond.__c_lock.__spinlock, 97 cond->c_cond.__c_waiting); 98 } 99 #endif 100 101 #if (KMP_OS_LINUX && KMP_AFFINITY_SUPPORTED) 102 103 /* Affinity support */ 104 105 void __kmp_affinity_bind_thread(int which) { 106 KMP_ASSERT2(KMP_AFFINITY_CAPABLE(), 107 "Illegal set affinity operation when not capable"); 108 109 kmp_affin_mask_t *mask; 110 KMP_CPU_ALLOC_ON_STACK(mask); 111 KMP_CPU_ZERO(mask); 112 KMP_CPU_SET(which, mask); 113 __kmp_set_system_affinity(mask, TRUE); 114 KMP_CPU_FREE_FROM_STACK(mask); 115 } 116 117 /* Determine if we can access affinity functionality on this version of 118 * Linux* OS by checking __NR_sched_{get,set}affinity system calls, and set 119 * __kmp_affin_mask_size to the appropriate value (0 means not capable). */ 120 void __kmp_affinity_determine_capable(const char *env_var) { 121 // Check and see if the OS supports thread affinity. 122 123 #define KMP_CPU_SET_SIZE_LIMIT (1024 * 1024) 124 125 int gCode; 126 int sCode; 127 unsigned char *buf; 128 buf = (unsigned char *)KMP_INTERNAL_MALLOC(KMP_CPU_SET_SIZE_LIMIT); 129 130 // If Linux* OS: 131 // If the syscall fails or returns a suggestion for the size, 132 // then we don't have to search for an appropriate size. 133 gCode = syscall(__NR_sched_getaffinity, 0, KMP_CPU_SET_SIZE_LIMIT, buf); 134 KA_TRACE(30, ("__kmp_affinity_determine_capable: " 135 "initial getaffinity call returned %d errno = %d\n", 136 gCode, errno)); 137 138 // if ((gCode < 0) && (errno == ENOSYS)) 139 if (gCode < 0) { 140 // System call not supported 141 if (__kmp_affinity_verbose || 142 (__kmp_affinity_warnings && (__kmp_affinity_type != affinity_none) && 143 (__kmp_affinity_type != affinity_default) && 144 (__kmp_affinity_type != affinity_disabled))) { 145 int error = errno; 146 kmp_msg_t err_code = KMP_ERR(error); 147 __kmp_msg(kmp_ms_warning, KMP_MSG(GetAffSysCallNotSupported, env_var), 148 err_code, __kmp_msg_null); 149 if (__kmp_generate_warnings == kmp_warnings_off) { 150 __kmp_str_free(&err_code.str); 151 } 152 } 153 KMP_AFFINITY_DISABLE(); 154 KMP_INTERNAL_FREE(buf); 155 return; 156 } 157 if (gCode > 0) { // Linux* OS only 158 // The optimal situation: the OS returns the size of the buffer it expects. 159 // 160 // A verification of correct behavior is that Isetaffinity on a NULL 161 // buffer with the same size fails with errno set to EFAULT. 162 sCode = syscall(__NR_sched_setaffinity, 0, gCode, NULL); 163 KA_TRACE(30, ("__kmp_affinity_determine_capable: " 164 "setaffinity for mask size %d returned %d errno = %d\n", 165 gCode, sCode, errno)); 166 if (sCode < 0) { 167 if (errno == ENOSYS) { 168 if (__kmp_affinity_verbose || 169 (__kmp_affinity_warnings && 170 (__kmp_affinity_type != affinity_none) && 171 (__kmp_affinity_type != affinity_default) && 172 (__kmp_affinity_type != affinity_disabled))) { 173 int error = errno; 174 kmp_msg_t err_code = KMP_ERR(error); 175 __kmp_msg(kmp_ms_warning, KMP_MSG(SetAffSysCallNotSupported, env_var), 176 err_code, __kmp_msg_null); 177 if (__kmp_generate_warnings == kmp_warnings_off) { 178 __kmp_str_free(&err_code.str); 179 } 180 } 181 KMP_AFFINITY_DISABLE(); 182 KMP_INTERNAL_FREE(buf); 183 } 184 if (errno == EFAULT) { 185 KMP_AFFINITY_ENABLE(gCode); 186 KA_TRACE(10, ("__kmp_affinity_determine_capable: " 187 "affinity supported (mask size %d)\n", 188 (int)__kmp_affin_mask_size)); 189 KMP_INTERNAL_FREE(buf); 190 return; 191 } 192 } 193 } 194 195 // Call the getaffinity system call repeatedly with increasing set sizes 196 // until we succeed, or reach an upper bound on the search. 197 KA_TRACE(30, ("__kmp_affinity_determine_capable: " 198 "searching for proper set size\n")); 199 int size; 200 for (size = 1; size <= KMP_CPU_SET_SIZE_LIMIT; size *= 2) { 201 gCode = syscall(__NR_sched_getaffinity, 0, size, buf); 202 KA_TRACE(30, ("__kmp_affinity_determine_capable: " 203 "getaffinity for mask size %d returned %d errno = %d\n", 204 size, gCode, errno)); 205 206 if (gCode < 0) { 207 if (errno == ENOSYS) { 208 // We shouldn't get here 209 KA_TRACE(30, ("__kmp_affinity_determine_capable: " 210 "inconsistent OS call behavior: errno == ENOSYS for mask " 211 "size %d\n", 212 size)); 213 if (__kmp_affinity_verbose || 214 (__kmp_affinity_warnings && 215 (__kmp_affinity_type != affinity_none) && 216 (__kmp_affinity_type != affinity_default) && 217 (__kmp_affinity_type != affinity_disabled))) { 218 int error = errno; 219 kmp_msg_t err_code = KMP_ERR(error); 220 __kmp_msg(kmp_ms_warning, KMP_MSG(GetAffSysCallNotSupported, env_var), 221 err_code, __kmp_msg_null); 222 if (__kmp_generate_warnings == kmp_warnings_off) { 223 __kmp_str_free(&err_code.str); 224 } 225 } 226 KMP_AFFINITY_DISABLE(); 227 KMP_INTERNAL_FREE(buf); 228 return; 229 } 230 continue; 231 } 232 233 sCode = syscall(__NR_sched_setaffinity, 0, gCode, NULL); 234 KA_TRACE(30, ("__kmp_affinity_determine_capable: " 235 "setaffinity for mask size %d returned %d errno = %d\n", 236 gCode, sCode, errno)); 237 if (sCode < 0) { 238 if (errno == ENOSYS) { // Linux* OS only 239 // We shouldn't get here 240 KA_TRACE(30, ("__kmp_affinity_determine_capable: " 241 "inconsistent OS call behavior: errno == ENOSYS for mask " 242 "size %d\n", 243 size)); 244 if (__kmp_affinity_verbose || 245 (__kmp_affinity_warnings && 246 (__kmp_affinity_type != affinity_none) && 247 (__kmp_affinity_type != affinity_default) && 248 (__kmp_affinity_type != affinity_disabled))) { 249 int error = errno; 250 kmp_msg_t err_code = KMP_ERR(error); 251 __kmp_msg(kmp_ms_warning, KMP_MSG(SetAffSysCallNotSupported, env_var), 252 err_code, __kmp_msg_null); 253 if (__kmp_generate_warnings == kmp_warnings_off) { 254 __kmp_str_free(&err_code.str); 255 } 256 } 257 KMP_AFFINITY_DISABLE(); 258 KMP_INTERNAL_FREE(buf); 259 return; 260 } 261 if (errno == EFAULT) { 262 KMP_AFFINITY_ENABLE(gCode); 263 KA_TRACE(10, ("__kmp_affinity_determine_capable: " 264 "affinity supported (mask size %d)\n", 265 (int)__kmp_affin_mask_size)); 266 KMP_INTERNAL_FREE(buf); 267 return; 268 } 269 } 270 } 271 // save uncaught error code 272 // int error = errno; 273 KMP_INTERNAL_FREE(buf); 274 // restore uncaught error code, will be printed at the next KMP_WARNING below 275 // errno = error; 276 277 // Affinity is not supported 278 KMP_AFFINITY_DISABLE(); 279 KA_TRACE(10, ("__kmp_affinity_determine_capable: " 280 "cannot determine mask size - affinity not supported\n")); 281 if (__kmp_affinity_verbose || 282 (__kmp_affinity_warnings && (__kmp_affinity_type != affinity_none) && 283 (__kmp_affinity_type != affinity_default) && 284 (__kmp_affinity_type != affinity_disabled))) { 285 KMP_WARNING(AffCantGetMaskSize, env_var); 286 } 287 } 288 289 #endif // KMP_OS_LINUX && KMP_AFFINITY_SUPPORTED 290 291 #if KMP_USE_FUTEX 292 293 int __kmp_futex_determine_capable() { 294 int loc = 0; 295 int rc = syscall(__NR_futex, &loc, FUTEX_WAKE, 1, NULL, NULL, 0); 296 int retval = (rc == 0) || (errno != ENOSYS); 297 298 KA_TRACE(10, 299 ("__kmp_futex_determine_capable: rc = %d errno = %d\n", rc, errno)); 300 KA_TRACE(10, ("__kmp_futex_determine_capable: futex syscall%s supported\n", 301 retval ? "" : " not")); 302 303 return retval; 304 } 305 306 #endif // KMP_USE_FUTEX 307 308 #if (KMP_ARCH_X86 || KMP_ARCH_X86_64) && (!KMP_ASM_INTRINS) 309 /* Only 32-bit "add-exchange" instruction on IA-32 architecture causes us to 310 use compare_and_store for these routines */ 311 312 kmp_int8 __kmp_test_then_or8(volatile kmp_int8 *p, kmp_int8 d) { 313 kmp_int8 old_value, new_value; 314 315 old_value = TCR_1(*p); 316 new_value = old_value | d; 317 318 while (!KMP_COMPARE_AND_STORE_REL8(p, old_value, new_value)) { 319 KMP_CPU_PAUSE(); 320 old_value = TCR_1(*p); 321 new_value = old_value | d; 322 } 323 return old_value; 324 } 325 326 kmp_int8 __kmp_test_then_and8(volatile kmp_int8 *p, kmp_int8 d) { 327 kmp_int8 old_value, new_value; 328 329 old_value = TCR_1(*p); 330 new_value = old_value & d; 331 332 while (!KMP_COMPARE_AND_STORE_REL8(p, old_value, new_value)) { 333 KMP_CPU_PAUSE(); 334 old_value = TCR_1(*p); 335 new_value = old_value & d; 336 } 337 return old_value; 338 } 339 340 kmp_uint32 __kmp_test_then_or32(volatile kmp_uint32 *p, kmp_uint32 d) { 341 kmp_uint32 old_value, new_value; 342 343 old_value = TCR_4(*p); 344 new_value = old_value | d; 345 346 while (!KMP_COMPARE_AND_STORE_REL32(p, old_value, new_value)) { 347 KMP_CPU_PAUSE(); 348 old_value = TCR_4(*p); 349 new_value = old_value | d; 350 } 351 return old_value; 352 } 353 354 kmp_uint32 __kmp_test_then_and32(volatile kmp_uint32 *p, kmp_uint32 d) { 355 kmp_uint32 old_value, new_value; 356 357 old_value = TCR_4(*p); 358 new_value = old_value & d; 359 360 while (!KMP_COMPARE_AND_STORE_REL32(p, old_value, new_value)) { 361 KMP_CPU_PAUSE(); 362 old_value = TCR_4(*p); 363 new_value = old_value & d; 364 } 365 return old_value; 366 } 367 368 #if KMP_ARCH_X86 369 kmp_int8 __kmp_test_then_add8(volatile kmp_int8 *p, kmp_int8 d) { 370 kmp_int8 old_value, new_value; 371 372 old_value = TCR_1(*p); 373 new_value = old_value + d; 374 375 while (!KMP_COMPARE_AND_STORE_REL8(p, old_value, new_value)) { 376 KMP_CPU_PAUSE(); 377 old_value = TCR_1(*p); 378 new_value = old_value + d; 379 } 380 return old_value; 381 } 382 383 kmp_int64 __kmp_test_then_add64(volatile kmp_int64 *p, kmp_int64 d) { 384 kmp_int64 old_value, new_value; 385 386 old_value = TCR_8(*p); 387 new_value = old_value + d; 388 389 while (!KMP_COMPARE_AND_STORE_REL64(p, old_value, new_value)) { 390 KMP_CPU_PAUSE(); 391 old_value = TCR_8(*p); 392 new_value = old_value + d; 393 } 394 return old_value; 395 } 396 #endif /* KMP_ARCH_X86 */ 397 398 kmp_uint64 __kmp_test_then_or64(volatile kmp_uint64 *p, kmp_uint64 d) { 399 kmp_uint64 old_value, new_value; 400 401 old_value = TCR_8(*p); 402 new_value = old_value | d; 403 while (!KMP_COMPARE_AND_STORE_REL64(p, old_value, new_value)) { 404 KMP_CPU_PAUSE(); 405 old_value = TCR_8(*p); 406 new_value = old_value | d; 407 } 408 return old_value; 409 } 410 411 kmp_uint64 __kmp_test_then_and64(volatile kmp_uint64 *p, kmp_uint64 d) { 412 kmp_uint64 old_value, new_value; 413 414 old_value = TCR_8(*p); 415 new_value = old_value & d; 416 while (!KMP_COMPARE_AND_STORE_REL64(p, old_value, new_value)) { 417 KMP_CPU_PAUSE(); 418 old_value = TCR_8(*p); 419 new_value = old_value & d; 420 } 421 return old_value; 422 } 423 424 #endif /* (KMP_ARCH_X86 || KMP_ARCH_X86_64) && (! KMP_ASM_INTRINS) */ 425 426 void __kmp_terminate_thread(int gtid) { 427 int status; 428 kmp_info_t *th = __kmp_threads[gtid]; 429 430 if (!th) 431 return; 432 433 #ifdef KMP_CANCEL_THREADS 434 KA_TRACE(10, ("__kmp_terminate_thread: kill (%d)\n", gtid)); 435 status = pthread_cancel(th->th.th_info.ds.ds_thread); 436 if (status != 0 && status != ESRCH) { 437 __kmp_fatal(KMP_MSG(CantTerminateWorkerThread), KMP_ERR(status), 438 __kmp_msg_null); 439 } 440 #endif 441 __kmp_yield(TRUE); 442 } // 443 444 /* Set thread stack info according to values returned by pthread_getattr_np(). 445 If values are unreasonable, assume call failed and use incremental stack 446 refinement method instead. Returns TRUE if the stack parameters could be 447 determined exactly, FALSE if incremental refinement is necessary. */ 448 static kmp_int32 __kmp_set_stack_info(int gtid, kmp_info_t *th) { 449 int stack_data; 450 #if KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD || \ 451 KMP_OS_HURD 452 pthread_attr_t attr; 453 int status; 454 size_t size = 0; 455 void *addr = 0; 456 457 /* Always do incremental stack refinement for ubermaster threads since the 458 initial thread stack range can be reduced by sibling thread creation so 459 pthread_attr_getstack may cause thread gtid aliasing */ 460 if (!KMP_UBER_GTID(gtid)) { 461 462 /* Fetch the real thread attributes */ 463 status = pthread_attr_init(&attr); 464 KMP_CHECK_SYSFAIL("pthread_attr_init", status); 465 #if KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD 466 status = pthread_attr_get_np(pthread_self(), &attr); 467 KMP_CHECK_SYSFAIL("pthread_attr_get_np", status); 468 #else 469 status = pthread_getattr_np(pthread_self(), &attr); 470 KMP_CHECK_SYSFAIL("pthread_getattr_np", status); 471 #endif 472 status = pthread_attr_getstack(&attr, &addr, &size); 473 KMP_CHECK_SYSFAIL("pthread_attr_getstack", status); 474 KA_TRACE(60, 475 ("__kmp_set_stack_info: T#%d pthread_attr_getstack returned size:" 476 " %lu, low addr: %p\n", 477 gtid, size, addr)); 478 status = pthread_attr_destroy(&attr); 479 KMP_CHECK_SYSFAIL("pthread_attr_destroy", status); 480 } 481 482 if (size != 0 && addr != 0) { // was stack parameter determination successful? 483 /* Store the correct base and size */ 484 TCW_PTR(th->th.th_info.ds.ds_stackbase, (((char *)addr) + size)); 485 TCW_PTR(th->th.th_info.ds.ds_stacksize, size); 486 TCW_4(th->th.th_info.ds.ds_stackgrow, FALSE); 487 return TRUE; 488 } 489 #endif /* KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD || 490 KMP_OS_HURD */ 491 /* Use incremental refinement starting from initial conservative estimate */ 492 TCW_PTR(th->th.th_info.ds.ds_stacksize, 0); 493 TCW_PTR(th->th.th_info.ds.ds_stackbase, &stack_data); 494 TCW_4(th->th.th_info.ds.ds_stackgrow, TRUE); 495 return FALSE; 496 } 497 498 static void *__kmp_launch_worker(void *thr) { 499 int status, old_type, old_state; 500 #ifdef KMP_BLOCK_SIGNALS 501 sigset_t new_set, old_set; 502 #endif /* KMP_BLOCK_SIGNALS */ 503 void *exit_val; 504 #if KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD || \ 505 KMP_OS_OPENBSD || KMP_OS_HURD 506 void *volatile padding = 0; 507 #endif 508 int gtid; 509 510 gtid = ((kmp_info_t *)thr)->th.th_info.ds.ds_gtid; 511 __kmp_gtid_set_specific(gtid); 512 #ifdef KMP_TDATA_GTID 513 __kmp_gtid = gtid; 514 #endif 515 #if KMP_STATS_ENABLED 516 // set thread local index to point to thread-specific stats 517 __kmp_stats_thread_ptr = ((kmp_info_t *)thr)->th.th_stats; 518 __kmp_stats_thread_ptr->startLife(); 519 KMP_SET_THREAD_STATE(IDLE); 520 KMP_INIT_PARTITIONED_TIMERS(OMP_idle); 521 #endif 522 523 #if USE_ITT_BUILD 524 __kmp_itt_thread_name(gtid); 525 #endif /* USE_ITT_BUILD */ 526 527 #if KMP_AFFINITY_SUPPORTED 528 __kmp_affinity_set_init_mask(gtid, FALSE); 529 #endif 530 531 #ifdef KMP_CANCEL_THREADS 532 status = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old_type); 533 KMP_CHECK_SYSFAIL("pthread_setcanceltype", status); 534 // josh todo: isn't PTHREAD_CANCEL_ENABLE default for newly-created threads? 535 status = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_state); 536 KMP_CHECK_SYSFAIL("pthread_setcancelstate", status); 537 #endif 538 539 #if KMP_ARCH_X86 || KMP_ARCH_X86_64 540 // Set FP control regs to be a copy of the parallel initialization thread's. 541 __kmp_clear_x87_fpu_status_word(); 542 __kmp_load_x87_fpu_control_word(&__kmp_init_x87_fpu_control_word); 543 __kmp_load_mxcsr(&__kmp_init_mxcsr); 544 #endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */ 545 546 #ifdef KMP_BLOCK_SIGNALS 547 status = sigfillset(&new_set); 548 KMP_CHECK_SYSFAIL_ERRNO("sigfillset", status); 549 status = pthread_sigmask(SIG_BLOCK, &new_set, &old_set); 550 KMP_CHECK_SYSFAIL("pthread_sigmask", status); 551 #endif /* KMP_BLOCK_SIGNALS */ 552 553 #if KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD || \ 554 KMP_OS_OPENBSD 555 if (__kmp_stkoffset > 0 && gtid > 0) { 556 padding = KMP_ALLOCA(gtid * __kmp_stkoffset); 557 } 558 #endif 559 560 KMP_MB(); 561 __kmp_set_stack_info(gtid, (kmp_info_t *)thr); 562 563 __kmp_check_stack_overlap((kmp_info_t *)thr); 564 565 exit_val = __kmp_launch_thread((kmp_info_t *)thr); 566 567 #ifdef KMP_BLOCK_SIGNALS 568 status = pthread_sigmask(SIG_SETMASK, &old_set, NULL); 569 KMP_CHECK_SYSFAIL("pthread_sigmask", status); 570 #endif /* KMP_BLOCK_SIGNALS */ 571 572 return exit_val; 573 } 574 575 #if KMP_USE_MONITOR 576 /* The monitor thread controls all of the threads in the complex */ 577 578 static void *__kmp_launch_monitor(void *thr) { 579 int status, old_type, old_state; 580 #ifdef KMP_BLOCK_SIGNALS 581 sigset_t new_set; 582 #endif /* KMP_BLOCK_SIGNALS */ 583 struct timespec interval; 584 int yield_count; 585 int yield_cycles = 0; 586 587 KMP_MB(); /* Flush all pending memory write invalidates. */ 588 589 KA_TRACE(10, ("__kmp_launch_monitor: #1 launched\n")); 590 591 /* register us as the monitor thread */ 592 __kmp_gtid_set_specific(KMP_GTID_MONITOR); 593 #ifdef KMP_TDATA_GTID 594 __kmp_gtid = KMP_GTID_MONITOR; 595 #endif 596 597 KMP_MB(); 598 599 #if USE_ITT_BUILD 600 // Instruct Intel(R) Threading Tools to ignore monitor thread. 601 __kmp_itt_thread_ignore(); 602 #endif /* USE_ITT_BUILD */ 603 604 __kmp_set_stack_info(((kmp_info_t *)thr)->th.th_info.ds.ds_gtid, 605 (kmp_info_t *)thr); 606 607 __kmp_check_stack_overlap((kmp_info_t *)thr); 608 609 #ifdef KMP_CANCEL_THREADS 610 status = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old_type); 611 KMP_CHECK_SYSFAIL("pthread_setcanceltype", status); 612 // josh todo: isn't PTHREAD_CANCEL_ENABLE default for newly-created threads? 613 status = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_state); 614 KMP_CHECK_SYSFAIL("pthread_setcancelstate", status); 615 #endif 616 617 #if KMP_REAL_TIME_FIX 618 // This is a potential fix which allows application with real-time scheduling 619 // policy work. However, decision about the fix is not made yet, so it is 620 // disabled by default. 621 { // Are program started with real-time scheduling policy? 622 int sched = sched_getscheduler(0); 623 if (sched == SCHED_FIFO || sched == SCHED_RR) { 624 // Yes, we are a part of real-time application. Try to increase the 625 // priority of the monitor. 626 struct sched_param param; 627 int max_priority = sched_get_priority_max(sched); 628 int rc; 629 KMP_WARNING(RealTimeSchedNotSupported); 630 sched_getparam(0, ¶m); 631 if (param.sched_priority < max_priority) { 632 param.sched_priority += 1; 633 rc = sched_setscheduler(0, sched, ¶m); 634 if (rc != 0) { 635 int error = errno; 636 kmp_msg_t err_code = KMP_ERR(error); 637 __kmp_msg(kmp_ms_warning, KMP_MSG(CantChangeMonitorPriority), 638 err_code, KMP_MSG(MonitorWillStarve), __kmp_msg_null); 639 if (__kmp_generate_warnings == kmp_warnings_off) { 640 __kmp_str_free(&err_code.str); 641 } 642 } 643 } else { 644 // We cannot abort here, because number of CPUs may be enough for all 645 // the threads, including the monitor thread, so application could 646 // potentially work... 647 __kmp_msg(kmp_ms_warning, KMP_MSG(RunningAtMaxPriority), 648 KMP_MSG(MonitorWillStarve), KMP_HNT(RunningAtMaxPriority), 649 __kmp_msg_null); 650 } 651 } 652 // AC: free thread that waits for monitor started 653 TCW_4(__kmp_global.g.g_time.dt.t_value, 0); 654 } 655 #endif // KMP_REAL_TIME_FIX 656 657 KMP_MB(); /* Flush all pending memory write invalidates. */ 658 659 if (__kmp_monitor_wakeups == 1) { 660 interval.tv_sec = 1; 661 interval.tv_nsec = 0; 662 } else { 663 interval.tv_sec = 0; 664 interval.tv_nsec = (KMP_NSEC_PER_SEC / __kmp_monitor_wakeups); 665 } 666 667 KA_TRACE(10, ("__kmp_launch_monitor: #2 monitor\n")); 668 669 if (__kmp_yield_cycle) { 670 __kmp_yielding_on = 0; /* Start out with yielding shut off */ 671 yield_count = __kmp_yield_off_count; 672 } else { 673 __kmp_yielding_on = 1; /* Yielding is on permanently */ 674 } 675 676 while (!TCR_4(__kmp_global.g.g_done)) { 677 struct timespec now; 678 struct timeval tval; 679 680 /* This thread monitors the state of the system */ 681 682 KA_TRACE(15, ("__kmp_launch_monitor: update\n")); 683 684 status = gettimeofday(&tval, NULL); 685 KMP_CHECK_SYSFAIL_ERRNO("gettimeofday", status); 686 TIMEVAL_TO_TIMESPEC(&tval, &now); 687 688 now.tv_sec += interval.tv_sec; 689 now.tv_nsec += interval.tv_nsec; 690 691 if (now.tv_nsec >= KMP_NSEC_PER_SEC) { 692 now.tv_sec += 1; 693 now.tv_nsec -= KMP_NSEC_PER_SEC; 694 } 695 696 status = pthread_mutex_lock(&__kmp_wait_mx.m_mutex); 697 KMP_CHECK_SYSFAIL("pthread_mutex_lock", status); 698 // AC: the monitor should not fall asleep if g_done has been set 699 if (!TCR_4(__kmp_global.g.g_done)) { // check once more under mutex 700 status = pthread_cond_timedwait(&__kmp_wait_cv.c_cond, 701 &__kmp_wait_mx.m_mutex, &now); 702 if (status != 0) { 703 if (status != ETIMEDOUT && status != EINTR) { 704 KMP_SYSFAIL("pthread_cond_timedwait", status); 705 } 706 } 707 } 708 status = pthread_mutex_unlock(&__kmp_wait_mx.m_mutex); 709 KMP_CHECK_SYSFAIL("pthread_mutex_unlock", status); 710 711 if (__kmp_yield_cycle) { 712 yield_cycles++; 713 if ((yield_cycles % yield_count) == 0) { 714 if (__kmp_yielding_on) { 715 __kmp_yielding_on = 0; /* Turn it off now */ 716 yield_count = __kmp_yield_off_count; 717 } else { 718 __kmp_yielding_on = 1; /* Turn it on now */ 719 yield_count = __kmp_yield_on_count; 720 } 721 yield_cycles = 0; 722 } 723 } else { 724 __kmp_yielding_on = 1; 725 } 726 727 TCW_4(__kmp_global.g.g_time.dt.t_value, 728 TCR_4(__kmp_global.g.g_time.dt.t_value) + 1); 729 730 KMP_MB(); /* Flush all pending memory write invalidates. */ 731 } 732 733 KA_TRACE(10, ("__kmp_launch_monitor: #3 cleanup\n")); 734 735 #ifdef KMP_BLOCK_SIGNALS 736 status = sigfillset(&new_set); 737 KMP_CHECK_SYSFAIL_ERRNO("sigfillset", status); 738 status = pthread_sigmask(SIG_UNBLOCK, &new_set, NULL); 739 KMP_CHECK_SYSFAIL("pthread_sigmask", status); 740 #endif /* KMP_BLOCK_SIGNALS */ 741 742 KA_TRACE(10, ("__kmp_launch_monitor: #4 finished\n")); 743 744 if (__kmp_global.g.g_abort != 0) { 745 /* now we need to terminate the worker threads */ 746 /* the value of t_abort is the signal we caught */ 747 748 int gtid; 749 750 KA_TRACE(10, ("__kmp_launch_monitor: #5 terminate sig=%d\n", 751 __kmp_global.g.g_abort)); 752 753 /* terminate the OpenMP worker threads */ 754 /* TODO this is not valid for sibling threads!! 755 * the uber master might not be 0 anymore.. */ 756 for (gtid = 1; gtid < __kmp_threads_capacity; ++gtid) 757 __kmp_terminate_thread(gtid); 758 759 __kmp_cleanup(); 760 761 KA_TRACE(10, ("__kmp_launch_monitor: #6 raise sig=%d\n", 762 __kmp_global.g.g_abort)); 763 764 if (__kmp_global.g.g_abort > 0) 765 raise(__kmp_global.g.g_abort); 766 } 767 768 KA_TRACE(10, ("__kmp_launch_monitor: #7 exit\n")); 769 770 return thr; 771 } 772 #endif // KMP_USE_MONITOR 773 774 void __kmp_create_worker(int gtid, kmp_info_t *th, size_t stack_size) { 775 pthread_t handle; 776 pthread_attr_t thread_attr; 777 int status; 778 779 th->th.th_info.ds.ds_gtid = gtid; 780 781 #if KMP_STATS_ENABLED 782 // sets up worker thread stats 783 __kmp_acquire_tas_lock(&__kmp_stats_lock, gtid); 784 785 // th->th.th_stats is used to transfer thread-specific stats-pointer to 786 // __kmp_launch_worker. So when thread is created (goes into 787 // __kmp_launch_worker) it will set its thread local pointer to 788 // th->th.th_stats 789 if (!KMP_UBER_GTID(gtid)) { 790 th->th.th_stats = __kmp_stats_list->push_back(gtid); 791 } else { 792 // For root threads, __kmp_stats_thread_ptr is set in __kmp_register_root(), 793 // so set the th->th.th_stats field to it. 794 th->th.th_stats = __kmp_stats_thread_ptr; 795 } 796 __kmp_release_tas_lock(&__kmp_stats_lock, gtid); 797 798 #endif // KMP_STATS_ENABLED 799 800 if (KMP_UBER_GTID(gtid)) { 801 KA_TRACE(10, ("__kmp_create_worker: uber thread (%d)\n", gtid)); 802 th->th.th_info.ds.ds_thread = pthread_self(); 803 __kmp_set_stack_info(gtid, th); 804 __kmp_check_stack_overlap(th); 805 return; 806 } 807 808 KA_TRACE(10, ("__kmp_create_worker: try to create thread (%d)\n", gtid)); 809 810 KMP_MB(); /* Flush all pending memory write invalidates. */ 811 812 #ifdef KMP_THREAD_ATTR 813 status = pthread_attr_init(&thread_attr); 814 if (status != 0) { 815 __kmp_fatal(KMP_MSG(CantInitThreadAttrs), KMP_ERR(status), __kmp_msg_null); 816 } 817 status = pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_JOINABLE); 818 if (status != 0) { 819 __kmp_fatal(KMP_MSG(CantSetWorkerState), KMP_ERR(status), __kmp_msg_null); 820 } 821 822 /* Set stack size for this thread now. 823 The multiple of 2 is there because on some machines, requesting an unusual 824 stacksize causes the thread to have an offset before the dummy alloca() 825 takes place to create the offset. Since we want the user to have a 826 sufficient stacksize AND support a stack offset, we alloca() twice the 827 offset so that the upcoming alloca() does not eliminate any premade offset, 828 and also gives the user the stack space they requested for all threads */ 829 stack_size += gtid * __kmp_stkoffset * 2; 830 831 KA_TRACE(10, ("__kmp_create_worker: T#%d, default stacksize = %lu bytes, " 832 "__kmp_stksize = %lu bytes, final stacksize = %lu bytes\n", 833 gtid, KMP_DEFAULT_STKSIZE, __kmp_stksize, stack_size)); 834 835 #ifdef _POSIX_THREAD_ATTR_STACKSIZE 836 status = pthread_attr_setstacksize(&thread_attr, stack_size); 837 #ifdef KMP_BACKUP_STKSIZE 838 if (status != 0) { 839 if (!__kmp_env_stksize) { 840 stack_size = KMP_BACKUP_STKSIZE + gtid * __kmp_stkoffset; 841 __kmp_stksize = KMP_BACKUP_STKSIZE; 842 KA_TRACE(10, ("__kmp_create_worker: T#%d, default stacksize = %lu bytes, " 843 "__kmp_stksize = %lu bytes, (backup) final stacksize = %lu " 844 "bytes\n", 845 gtid, KMP_DEFAULT_STKSIZE, __kmp_stksize, stack_size)); 846 status = pthread_attr_setstacksize(&thread_attr, stack_size); 847 } 848 } 849 #endif /* KMP_BACKUP_STKSIZE */ 850 if (status != 0) { 851 __kmp_fatal(KMP_MSG(CantSetWorkerStackSize, stack_size), KMP_ERR(status), 852 KMP_HNT(ChangeWorkerStackSize), __kmp_msg_null); 853 } 854 #endif /* _POSIX_THREAD_ATTR_STACKSIZE */ 855 856 #endif /* KMP_THREAD_ATTR */ 857 858 status = 859 pthread_create(&handle, &thread_attr, __kmp_launch_worker, (void *)th); 860 if (status != 0 || !handle) { // ??? Why do we check handle?? 861 #ifdef _POSIX_THREAD_ATTR_STACKSIZE 862 if (status == EINVAL) { 863 __kmp_fatal(KMP_MSG(CantSetWorkerStackSize, stack_size), KMP_ERR(status), 864 KMP_HNT(IncreaseWorkerStackSize), __kmp_msg_null); 865 } 866 if (status == ENOMEM) { 867 __kmp_fatal(KMP_MSG(CantSetWorkerStackSize, stack_size), KMP_ERR(status), 868 KMP_HNT(DecreaseWorkerStackSize), __kmp_msg_null); 869 } 870 #endif /* _POSIX_THREAD_ATTR_STACKSIZE */ 871 if (status == EAGAIN) { 872 __kmp_fatal(KMP_MSG(NoResourcesForWorkerThread), KMP_ERR(status), 873 KMP_HNT(Decrease_NUM_THREADS), __kmp_msg_null); 874 } 875 KMP_SYSFAIL("pthread_create", status); 876 } 877 878 th->th.th_info.ds.ds_thread = handle; 879 880 #ifdef KMP_THREAD_ATTR 881 status = pthread_attr_destroy(&thread_attr); 882 if (status) { 883 kmp_msg_t err_code = KMP_ERR(status); 884 __kmp_msg(kmp_ms_warning, KMP_MSG(CantDestroyThreadAttrs), err_code, 885 __kmp_msg_null); 886 if (__kmp_generate_warnings == kmp_warnings_off) { 887 __kmp_str_free(&err_code.str); 888 } 889 } 890 #endif /* KMP_THREAD_ATTR */ 891 892 KMP_MB(); /* Flush all pending memory write invalidates. */ 893 894 KA_TRACE(10, ("__kmp_create_worker: done creating thread (%d)\n", gtid)); 895 896 } // __kmp_create_worker 897 898 #if KMP_USE_MONITOR 899 void __kmp_create_monitor(kmp_info_t *th) { 900 pthread_t handle; 901 pthread_attr_t thread_attr; 902 size_t size; 903 int status; 904 int auto_adj_size = FALSE; 905 906 if (__kmp_dflt_blocktime == KMP_MAX_BLOCKTIME) { 907 // We don't need monitor thread in case of MAX_BLOCKTIME 908 KA_TRACE(10, ("__kmp_create_monitor: skipping monitor thread because of " 909 "MAX blocktime\n")); 910 th->th.th_info.ds.ds_tid = 0; // this makes reap_monitor no-op 911 th->th.th_info.ds.ds_gtid = 0; 912 return; 913 } 914 KA_TRACE(10, ("__kmp_create_monitor: try to create monitor\n")); 915 916 KMP_MB(); /* Flush all pending memory write invalidates. */ 917 918 th->th.th_info.ds.ds_tid = KMP_GTID_MONITOR; 919 th->th.th_info.ds.ds_gtid = KMP_GTID_MONITOR; 920 #if KMP_REAL_TIME_FIX 921 TCW_4(__kmp_global.g.g_time.dt.t_value, 922 -1); // Will use it for synchronization a bit later. 923 #else 924 TCW_4(__kmp_global.g.g_time.dt.t_value, 0); 925 #endif // KMP_REAL_TIME_FIX 926 927 #ifdef KMP_THREAD_ATTR 928 if (__kmp_monitor_stksize == 0) { 929 __kmp_monitor_stksize = KMP_DEFAULT_MONITOR_STKSIZE; 930 auto_adj_size = TRUE; 931 } 932 status = pthread_attr_init(&thread_attr); 933 if (status != 0) { 934 __kmp_fatal(KMP_MSG(CantInitThreadAttrs), KMP_ERR(status), __kmp_msg_null); 935 } 936 status = pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_JOINABLE); 937 if (status != 0) { 938 __kmp_fatal(KMP_MSG(CantSetMonitorState), KMP_ERR(status), __kmp_msg_null); 939 } 940 941 #ifdef _POSIX_THREAD_ATTR_STACKSIZE 942 status = pthread_attr_getstacksize(&thread_attr, &size); 943 KMP_CHECK_SYSFAIL("pthread_attr_getstacksize", status); 944 #else 945 size = __kmp_sys_min_stksize; 946 #endif /* _POSIX_THREAD_ATTR_STACKSIZE */ 947 #endif /* KMP_THREAD_ATTR */ 948 949 if (__kmp_monitor_stksize == 0) { 950 __kmp_monitor_stksize = KMP_DEFAULT_MONITOR_STKSIZE; 951 } 952 if (__kmp_monitor_stksize < __kmp_sys_min_stksize) { 953 __kmp_monitor_stksize = __kmp_sys_min_stksize; 954 } 955 956 KA_TRACE(10, ("__kmp_create_monitor: default stacksize = %lu bytes," 957 "requested stacksize = %lu bytes\n", 958 size, __kmp_monitor_stksize)); 959 960 retry: 961 962 /* Set stack size for this thread now. */ 963 #ifdef _POSIX_THREAD_ATTR_STACKSIZE 964 KA_TRACE(10, ("__kmp_create_monitor: setting stacksize = %lu bytes,", 965 __kmp_monitor_stksize)); 966 status = pthread_attr_setstacksize(&thread_attr, __kmp_monitor_stksize); 967 if (status != 0) { 968 if (auto_adj_size) { 969 __kmp_monitor_stksize *= 2; 970 goto retry; 971 } 972 kmp_msg_t err_code = KMP_ERR(status); 973 __kmp_msg(kmp_ms_warning, // should this be fatal? BB 974 KMP_MSG(CantSetMonitorStackSize, (long int)__kmp_monitor_stksize), 975 err_code, KMP_HNT(ChangeMonitorStackSize), __kmp_msg_null); 976 if (__kmp_generate_warnings == kmp_warnings_off) { 977 __kmp_str_free(&err_code.str); 978 } 979 } 980 #endif /* _POSIX_THREAD_ATTR_STACKSIZE */ 981 982 status = 983 pthread_create(&handle, &thread_attr, __kmp_launch_monitor, (void *)th); 984 985 if (status != 0) { 986 #ifdef _POSIX_THREAD_ATTR_STACKSIZE 987 if (status == EINVAL) { 988 if (auto_adj_size && (__kmp_monitor_stksize < (size_t)0x40000000)) { 989 __kmp_monitor_stksize *= 2; 990 goto retry; 991 } 992 __kmp_fatal(KMP_MSG(CantSetMonitorStackSize, __kmp_monitor_stksize), 993 KMP_ERR(status), KMP_HNT(IncreaseMonitorStackSize), 994 __kmp_msg_null); 995 } 996 if (status == ENOMEM) { 997 __kmp_fatal(KMP_MSG(CantSetMonitorStackSize, __kmp_monitor_stksize), 998 KMP_ERR(status), KMP_HNT(DecreaseMonitorStackSize), 999 __kmp_msg_null); 1000 } 1001 #endif /* _POSIX_THREAD_ATTR_STACKSIZE */ 1002 if (status == EAGAIN) { 1003 __kmp_fatal(KMP_MSG(NoResourcesForMonitorThread), KMP_ERR(status), 1004 KMP_HNT(DecreaseNumberOfThreadsInUse), __kmp_msg_null); 1005 } 1006 KMP_SYSFAIL("pthread_create", status); 1007 } 1008 1009 th->th.th_info.ds.ds_thread = handle; 1010 1011 #if KMP_REAL_TIME_FIX 1012 // Wait for the monitor thread is really started and set its *priority*. 1013 KMP_DEBUG_ASSERT(sizeof(kmp_uint32) == 1014 sizeof(__kmp_global.g.g_time.dt.t_value)); 1015 __kmp_wait_yield_4((kmp_uint32 volatile *)&__kmp_global.g.g_time.dt.t_value, 1016 -1, &__kmp_neq_4, NULL); 1017 #endif // KMP_REAL_TIME_FIX 1018 1019 #ifdef KMP_THREAD_ATTR 1020 status = pthread_attr_destroy(&thread_attr); 1021 if (status != 0) { 1022 kmp_msg_t err_code = KMP_ERR(status); 1023 __kmp_msg(kmp_ms_warning, KMP_MSG(CantDestroyThreadAttrs), err_code, 1024 __kmp_msg_null); 1025 if (__kmp_generate_warnings == kmp_warnings_off) { 1026 __kmp_str_free(&err_code.str); 1027 } 1028 } 1029 #endif 1030 1031 KMP_MB(); /* Flush all pending memory write invalidates. */ 1032 1033 KA_TRACE(10, ("__kmp_create_monitor: monitor created %#.8lx\n", 1034 th->th.th_info.ds.ds_thread)); 1035 1036 } // __kmp_create_monitor 1037 #endif // KMP_USE_MONITOR 1038 1039 void __kmp_exit_thread(int exit_status) { 1040 pthread_exit((void *)(intptr_t)exit_status); 1041 } // __kmp_exit_thread 1042 1043 #if KMP_USE_MONITOR 1044 void __kmp_resume_monitor(); 1045 1046 void __kmp_reap_monitor(kmp_info_t *th) { 1047 int status; 1048 void *exit_val; 1049 1050 KA_TRACE(10, ("__kmp_reap_monitor: try to reap monitor thread with handle" 1051 " %#.8lx\n", 1052 th->th.th_info.ds.ds_thread)); 1053 1054 // If monitor has been created, its tid and gtid should be KMP_GTID_MONITOR. 1055 // If both tid and gtid are 0, it means the monitor did not ever start. 1056 // If both tid and gtid are KMP_GTID_DNE, the monitor has been shut down. 1057 KMP_DEBUG_ASSERT(th->th.th_info.ds.ds_tid == th->th.th_info.ds.ds_gtid); 1058 if (th->th.th_info.ds.ds_gtid != KMP_GTID_MONITOR) { 1059 KA_TRACE(10, ("__kmp_reap_monitor: monitor did not start, returning\n")); 1060 return; 1061 } 1062 1063 KMP_MB(); /* Flush all pending memory write invalidates. */ 1064 1065 /* First, check to see whether the monitor thread exists to wake it up. This 1066 is to avoid performance problem when the monitor sleeps during 1067 blocktime-size interval */ 1068 1069 status = pthread_kill(th->th.th_info.ds.ds_thread, 0); 1070 if (status != ESRCH) { 1071 __kmp_resume_monitor(); // Wake up the monitor thread 1072 } 1073 KA_TRACE(10, ("__kmp_reap_monitor: try to join with monitor\n")); 1074 status = pthread_join(th->th.th_info.ds.ds_thread, &exit_val); 1075 if (exit_val != th) { 1076 __kmp_fatal(KMP_MSG(ReapMonitorError), KMP_ERR(status), __kmp_msg_null); 1077 } 1078 1079 th->th.th_info.ds.ds_tid = KMP_GTID_DNE; 1080 th->th.th_info.ds.ds_gtid = KMP_GTID_DNE; 1081 1082 KA_TRACE(10, ("__kmp_reap_monitor: done reaping monitor thread with handle" 1083 " %#.8lx\n", 1084 th->th.th_info.ds.ds_thread)); 1085 1086 KMP_MB(); /* Flush all pending memory write invalidates. */ 1087 } 1088 #endif // KMP_USE_MONITOR 1089 1090 void __kmp_reap_worker(kmp_info_t *th) { 1091 int status; 1092 void *exit_val; 1093 1094 KMP_MB(); /* Flush all pending memory write invalidates. */ 1095 1096 KA_TRACE( 1097 10, ("__kmp_reap_worker: try to reap T#%d\n", th->th.th_info.ds.ds_gtid)); 1098 1099 status = pthread_join(th->th.th_info.ds.ds_thread, &exit_val); 1100 #ifdef KMP_DEBUG 1101 /* Don't expose these to the user until we understand when they trigger */ 1102 if (status != 0) { 1103 __kmp_fatal(KMP_MSG(ReapWorkerError), KMP_ERR(status), __kmp_msg_null); 1104 } 1105 if (exit_val != th) { 1106 KA_TRACE(10, ("__kmp_reap_worker: worker T#%d did not reap properly, " 1107 "exit_val = %p\n", 1108 th->th.th_info.ds.ds_gtid, exit_val)); 1109 } 1110 #endif /* KMP_DEBUG */ 1111 1112 KA_TRACE(10, ("__kmp_reap_worker: done reaping T#%d\n", 1113 th->th.th_info.ds.ds_gtid)); 1114 1115 KMP_MB(); /* Flush all pending memory write invalidates. */ 1116 } 1117 1118 #if KMP_HANDLE_SIGNALS 1119 1120 static void __kmp_null_handler(int signo) { 1121 // Do nothing, for doing SIG_IGN-type actions. 1122 } // __kmp_null_handler 1123 1124 static void __kmp_team_handler(int signo) { 1125 if (__kmp_global.g.g_abort == 0) { 1126 /* Stage 1 signal handler, let's shut down all of the threads */ 1127 #ifdef KMP_DEBUG 1128 __kmp_debug_printf("__kmp_team_handler: caught signal = %d\n", signo); 1129 #endif 1130 switch (signo) { 1131 case SIGHUP: 1132 case SIGINT: 1133 case SIGQUIT: 1134 case SIGILL: 1135 case SIGABRT: 1136 case SIGFPE: 1137 case SIGBUS: 1138 case SIGSEGV: 1139 #ifdef SIGSYS 1140 case SIGSYS: 1141 #endif 1142 case SIGTERM: 1143 if (__kmp_debug_buf) { 1144 __kmp_dump_debug_buffer(); 1145 } 1146 KMP_MB(); // Flush all pending memory write invalidates. 1147 TCW_4(__kmp_global.g.g_abort, signo); 1148 KMP_MB(); // Flush all pending memory write invalidates. 1149 TCW_4(__kmp_global.g.g_done, TRUE); 1150 KMP_MB(); // Flush all pending memory write invalidates. 1151 break; 1152 default: 1153 #ifdef KMP_DEBUG 1154 __kmp_debug_printf("__kmp_team_handler: unknown signal type"); 1155 #endif 1156 break; 1157 } 1158 } 1159 } // __kmp_team_handler 1160 1161 static void __kmp_sigaction(int signum, const struct sigaction *act, 1162 struct sigaction *oldact) { 1163 int rc = sigaction(signum, act, oldact); 1164 KMP_CHECK_SYSFAIL_ERRNO("sigaction", rc); 1165 } 1166 1167 static void __kmp_install_one_handler(int sig, sig_func_t handler_func, 1168 int parallel_init) { 1169 KMP_MB(); // Flush all pending memory write invalidates. 1170 KB_TRACE(60, 1171 ("__kmp_install_one_handler( %d, ..., %d )\n", sig, parallel_init)); 1172 if (parallel_init) { 1173 struct sigaction new_action; 1174 struct sigaction old_action; 1175 new_action.sa_handler = handler_func; 1176 new_action.sa_flags = 0; 1177 sigfillset(&new_action.sa_mask); 1178 __kmp_sigaction(sig, &new_action, &old_action); 1179 if (old_action.sa_handler == __kmp_sighldrs[sig].sa_handler) { 1180 sigaddset(&__kmp_sigset, sig); 1181 } else { 1182 // Restore/keep user's handler if one previously installed. 1183 __kmp_sigaction(sig, &old_action, NULL); 1184 } 1185 } else { 1186 // Save initial/system signal handlers to see if user handlers installed. 1187 __kmp_sigaction(sig, NULL, &__kmp_sighldrs[sig]); 1188 } 1189 KMP_MB(); // Flush all pending memory write invalidates. 1190 } // __kmp_install_one_handler 1191 1192 static void __kmp_remove_one_handler(int sig) { 1193 KB_TRACE(60, ("__kmp_remove_one_handler( %d )\n", sig)); 1194 if (sigismember(&__kmp_sigset, sig)) { 1195 struct sigaction old; 1196 KMP_MB(); // Flush all pending memory write invalidates. 1197 __kmp_sigaction(sig, &__kmp_sighldrs[sig], &old); 1198 if ((old.sa_handler != __kmp_team_handler) && 1199 (old.sa_handler != __kmp_null_handler)) { 1200 // Restore the users signal handler. 1201 KB_TRACE(10, ("__kmp_remove_one_handler: oops, not our handler, " 1202 "restoring: sig=%d\n", 1203 sig)); 1204 __kmp_sigaction(sig, &old, NULL); 1205 } 1206 sigdelset(&__kmp_sigset, sig); 1207 KMP_MB(); // Flush all pending memory write invalidates. 1208 } 1209 } // __kmp_remove_one_handler 1210 1211 void __kmp_install_signals(int parallel_init) { 1212 KB_TRACE(10, ("__kmp_install_signals( %d )\n", parallel_init)); 1213 if (__kmp_handle_signals || !parallel_init) { 1214 // If ! parallel_init, we do not install handlers, just save original 1215 // handlers. Let us do it even __handle_signals is 0. 1216 sigemptyset(&__kmp_sigset); 1217 __kmp_install_one_handler(SIGHUP, __kmp_team_handler, parallel_init); 1218 __kmp_install_one_handler(SIGINT, __kmp_team_handler, parallel_init); 1219 __kmp_install_one_handler(SIGQUIT, __kmp_team_handler, parallel_init); 1220 __kmp_install_one_handler(SIGILL, __kmp_team_handler, parallel_init); 1221 __kmp_install_one_handler(SIGABRT, __kmp_team_handler, parallel_init); 1222 __kmp_install_one_handler(SIGFPE, __kmp_team_handler, parallel_init); 1223 __kmp_install_one_handler(SIGBUS, __kmp_team_handler, parallel_init); 1224 __kmp_install_one_handler(SIGSEGV, __kmp_team_handler, parallel_init); 1225 #ifdef SIGSYS 1226 __kmp_install_one_handler(SIGSYS, __kmp_team_handler, parallel_init); 1227 #endif // SIGSYS 1228 __kmp_install_one_handler(SIGTERM, __kmp_team_handler, parallel_init); 1229 #ifdef SIGPIPE 1230 __kmp_install_one_handler(SIGPIPE, __kmp_team_handler, parallel_init); 1231 #endif // SIGPIPE 1232 } 1233 } // __kmp_install_signals 1234 1235 void __kmp_remove_signals(void) { 1236 int sig; 1237 KB_TRACE(10, ("__kmp_remove_signals()\n")); 1238 for (sig = 1; sig < NSIG; ++sig) { 1239 __kmp_remove_one_handler(sig); 1240 } 1241 } // __kmp_remove_signals 1242 1243 #endif // KMP_HANDLE_SIGNALS 1244 1245 void __kmp_enable(int new_state) { 1246 #ifdef KMP_CANCEL_THREADS 1247 int status, old_state; 1248 status = pthread_setcancelstate(new_state, &old_state); 1249 KMP_CHECK_SYSFAIL("pthread_setcancelstate", status); 1250 KMP_DEBUG_ASSERT(old_state == PTHREAD_CANCEL_DISABLE); 1251 #endif 1252 } 1253 1254 void __kmp_disable(int *old_state) { 1255 #ifdef KMP_CANCEL_THREADS 1256 int status; 1257 status = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, old_state); 1258 KMP_CHECK_SYSFAIL("pthread_setcancelstate", status); 1259 #endif 1260 } 1261 1262 static void __kmp_atfork_prepare(void) { 1263 __kmp_acquire_bootstrap_lock(&__kmp_initz_lock); 1264 __kmp_acquire_bootstrap_lock(&__kmp_forkjoin_lock); 1265 } 1266 1267 static void __kmp_atfork_parent(void) { 1268 __kmp_release_bootstrap_lock(&__kmp_initz_lock); 1269 __kmp_release_bootstrap_lock(&__kmp_forkjoin_lock); 1270 } 1271 1272 /* Reset the library so execution in the child starts "all over again" with 1273 clean data structures in initial states. Don't worry about freeing memory 1274 allocated by parent, just abandon it to be safe. */ 1275 static void __kmp_atfork_child(void) { 1276 __kmp_release_bootstrap_lock(&__kmp_forkjoin_lock); 1277 /* TODO make sure this is done right for nested/sibling */ 1278 // ATT: Memory leaks are here? TODO: Check it and fix. 1279 /* KMP_ASSERT( 0 ); */ 1280 1281 ++__kmp_fork_count; 1282 1283 #if KMP_AFFINITY_SUPPORTED 1284 #if KMP_OS_LINUX 1285 // reset the affinity in the child to the initial thread 1286 // affinity in the parent 1287 kmp_set_thread_affinity_mask_initial(); 1288 #endif 1289 // Set default not to bind threads tightly in the child (we’re expecting 1290 // over-subscription after the fork and this can improve things for 1291 // scripting languages that use OpenMP inside process-parallel code). 1292 __kmp_affinity_type = affinity_none; 1293 #if OMP_40_ENABLED 1294 if (__kmp_nested_proc_bind.bind_types != NULL) { 1295 __kmp_nested_proc_bind.bind_types[0] = proc_bind_false; 1296 } 1297 #endif // OMP_40_ENABLED 1298 #endif // KMP_AFFINITY_SUPPORTED 1299 1300 __kmp_init_runtime = FALSE; 1301 #if KMP_USE_MONITOR 1302 __kmp_init_monitor = 0; 1303 #endif 1304 __kmp_init_parallel = FALSE; 1305 __kmp_init_middle = FALSE; 1306 __kmp_init_serial = FALSE; 1307 TCW_4(__kmp_init_gtid, FALSE); 1308 __kmp_init_common = FALSE; 1309 1310 TCW_4(__kmp_init_user_locks, FALSE); 1311 #if !KMP_USE_DYNAMIC_LOCK 1312 __kmp_user_lock_table.used = 1; 1313 __kmp_user_lock_table.allocated = 0; 1314 __kmp_user_lock_table.table = NULL; 1315 __kmp_lock_blocks = NULL; 1316 #endif 1317 1318 __kmp_all_nth = 0; 1319 TCW_4(__kmp_nth, 0); 1320 1321 __kmp_thread_pool = NULL; 1322 __kmp_thread_pool_insert_pt = NULL; 1323 __kmp_team_pool = NULL; 1324 1325 /* Must actually zero all the *cache arguments passed to __kmpc_threadprivate 1326 here so threadprivate doesn't use stale data */ 1327 KA_TRACE(10, ("__kmp_atfork_child: checking cache address list %p\n", 1328 __kmp_threadpriv_cache_list)); 1329 1330 while (__kmp_threadpriv_cache_list != NULL) { 1331 1332 if (*__kmp_threadpriv_cache_list->addr != NULL) { 1333 KC_TRACE(50, ("__kmp_atfork_child: zeroing cache at address %p\n", 1334 &(*__kmp_threadpriv_cache_list->addr))); 1335 1336 *__kmp_threadpriv_cache_list->addr = NULL; 1337 } 1338 __kmp_threadpriv_cache_list = __kmp_threadpriv_cache_list->next; 1339 } 1340 1341 __kmp_init_runtime = FALSE; 1342 1343 /* reset statically initialized locks */ 1344 __kmp_init_bootstrap_lock(&__kmp_initz_lock); 1345 __kmp_init_bootstrap_lock(&__kmp_stdio_lock); 1346 __kmp_init_bootstrap_lock(&__kmp_console_lock); 1347 __kmp_init_bootstrap_lock(&__kmp_task_team_lock); 1348 1349 #if USE_ITT_BUILD 1350 __kmp_itt_reset(); // reset ITT's global state 1351 #endif /* USE_ITT_BUILD */ 1352 1353 /* This is necessary to make sure no stale data is left around */ 1354 /* AC: customers complain that we use unsafe routines in the atfork 1355 handler. Mathworks: dlsym() is unsafe. We call dlsym and dlopen 1356 in dynamic_link when check the presence of shared tbbmalloc library. 1357 Suggestion is to make the library initialization lazier, similar 1358 to what done for __kmpc_begin(). */ 1359 // TODO: synchronize all static initializations with regular library 1360 // startup; look at kmp_global.cpp and etc. 1361 //__kmp_internal_begin (); 1362 } 1363 1364 void __kmp_register_atfork(void) { 1365 if (__kmp_need_register_atfork) { 1366 int status = pthread_atfork(__kmp_atfork_prepare, __kmp_atfork_parent, 1367 __kmp_atfork_child); 1368 KMP_CHECK_SYSFAIL("pthread_atfork", status); 1369 __kmp_need_register_atfork = FALSE; 1370 } 1371 } 1372 1373 void __kmp_suspend_initialize(void) { 1374 int status; 1375 status = pthread_mutexattr_init(&__kmp_suspend_mutex_attr); 1376 KMP_CHECK_SYSFAIL("pthread_mutexattr_init", status); 1377 status = pthread_condattr_init(&__kmp_suspend_cond_attr); 1378 KMP_CHECK_SYSFAIL("pthread_condattr_init", status); 1379 } 1380 1381 static void __kmp_suspend_initialize_thread(kmp_info_t *th) { 1382 ANNOTATE_HAPPENS_AFTER(&th->th.th_suspend_init_count); 1383 if (th->th.th_suspend_init_count <= __kmp_fork_count) { 1384 /* this means we haven't initialized the suspension pthread objects for this 1385 thread in this instance of the process */ 1386 int status; 1387 status = pthread_cond_init(&th->th.th_suspend_cv.c_cond, 1388 &__kmp_suspend_cond_attr); 1389 KMP_CHECK_SYSFAIL("pthread_cond_init", status); 1390 status = pthread_mutex_init(&th->th.th_suspend_mx.m_mutex, 1391 &__kmp_suspend_mutex_attr); 1392 KMP_CHECK_SYSFAIL("pthread_mutex_init", status); 1393 *(volatile int *)&th->th.th_suspend_init_count = __kmp_fork_count + 1; 1394 ANNOTATE_HAPPENS_BEFORE(&th->th.th_suspend_init_count); 1395 } 1396 } 1397 1398 void __kmp_suspend_uninitialize_thread(kmp_info_t *th) { 1399 if (th->th.th_suspend_init_count > __kmp_fork_count) { 1400 /* this means we have initialize the suspension pthread objects for this 1401 thread in this instance of the process */ 1402 int status; 1403 1404 status = pthread_cond_destroy(&th->th.th_suspend_cv.c_cond); 1405 if (status != 0 && status != EBUSY) { 1406 KMP_SYSFAIL("pthread_cond_destroy", status); 1407 } 1408 status = pthread_mutex_destroy(&th->th.th_suspend_mx.m_mutex); 1409 if (status != 0 && status != EBUSY) { 1410 KMP_SYSFAIL("pthread_mutex_destroy", status); 1411 } 1412 --th->th.th_suspend_init_count; 1413 KMP_DEBUG_ASSERT(th->th.th_suspend_init_count == __kmp_fork_count); 1414 } 1415 } 1416 1417 /* This routine puts the calling thread to sleep after setting the 1418 sleep bit for the indicated flag variable to true. */ 1419 template <class C> 1420 static inline void __kmp_suspend_template(int th_gtid, C *flag) { 1421 KMP_TIME_DEVELOPER_PARTITIONED_BLOCK(USER_suspend); 1422 kmp_info_t *th = __kmp_threads[th_gtid]; 1423 int status; 1424 typename C::flag_t old_spin; 1425 1426 KF_TRACE(30, ("__kmp_suspend_template: T#%d enter for flag = %p\n", th_gtid, 1427 flag->get())); 1428 1429 __kmp_suspend_initialize_thread(th); 1430 1431 status = pthread_mutex_lock(&th->th.th_suspend_mx.m_mutex); 1432 KMP_CHECK_SYSFAIL("pthread_mutex_lock", status); 1433 1434 KF_TRACE(10, ("__kmp_suspend_template: T#%d setting sleep bit for spin(%p)\n", 1435 th_gtid, flag->get())); 1436 1437 /* TODO: shouldn't this use release semantics to ensure that 1438 __kmp_suspend_initialize_thread gets called first? */ 1439 old_spin = flag->set_sleeping(); 1440 1441 KF_TRACE(5, ("__kmp_suspend_template: T#%d set sleep bit for spin(%p)==%x," 1442 " was %x\n", 1443 th_gtid, flag->get(), flag->load(), old_spin)); 1444 1445 if (flag->done_check_val(old_spin)) { 1446 old_spin = flag->unset_sleeping(); 1447 KF_TRACE(5, ("__kmp_suspend_template: T#%d false alarm, reset sleep bit " 1448 "for spin(%p)\n", 1449 th_gtid, flag->get())); 1450 } else { 1451 /* Encapsulate in a loop as the documentation states that this may 1452 "with low probability" return when the condition variable has 1453 not been signaled or broadcast */ 1454 int deactivated = FALSE; 1455 TCW_PTR(th->th.th_sleep_loc, (void *)flag); 1456 1457 while (flag->is_sleeping()) { 1458 #ifdef DEBUG_SUSPEND 1459 char buffer[128]; 1460 __kmp_suspend_count++; 1461 __kmp_print_cond(buffer, &th->th.th_suspend_cv); 1462 __kmp_printf("__kmp_suspend_template: suspending T#%d: %s\n", th_gtid, 1463 buffer); 1464 #endif 1465 // Mark the thread as no longer active (only in the first iteration of the 1466 // loop). 1467 if (!deactivated) { 1468 th->th.th_active = FALSE; 1469 if (th->th.th_active_in_pool) { 1470 th->th.th_active_in_pool = FALSE; 1471 KMP_ATOMIC_DEC(&__kmp_thread_pool_active_nth); 1472 KMP_DEBUG_ASSERT(TCR_4(__kmp_thread_pool_active_nth) >= 0); 1473 } 1474 deactivated = TRUE; 1475 } 1476 1477 #if USE_SUSPEND_TIMEOUT 1478 struct timespec now; 1479 struct timeval tval; 1480 int msecs; 1481 1482 status = gettimeofday(&tval, NULL); 1483 KMP_CHECK_SYSFAIL_ERRNO("gettimeofday", status); 1484 TIMEVAL_TO_TIMESPEC(&tval, &now); 1485 1486 msecs = (4 * __kmp_dflt_blocktime) + 200; 1487 now.tv_sec += msecs / 1000; 1488 now.tv_nsec += (msecs % 1000) * 1000; 1489 1490 KF_TRACE(15, ("__kmp_suspend_template: T#%d about to perform " 1491 "pthread_cond_timedwait\n", 1492 th_gtid)); 1493 status = pthread_cond_timedwait(&th->th.th_suspend_cv.c_cond, 1494 &th->th.th_suspend_mx.m_mutex, &now); 1495 #else 1496 KF_TRACE(15, ("__kmp_suspend_template: T#%d about to perform" 1497 " pthread_cond_wait\n", 1498 th_gtid)); 1499 status = pthread_cond_wait(&th->th.th_suspend_cv.c_cond, 1500 &th->th.th_suspend_mx.m_mutex); 1501 #endif 1502 1503 if ((status != 0) && (status != EINTR) && (status != ETIMEDOUT)) { 1504 KMP_SYSFAIL("pthread_cond_wait", status); 1505 } 1506 #ifdef KMP_DEBUG 1507 if (status == ETIMEDOUT) { 1508 if (flag->is_sleeping()) { 1509 KF_TRACE(100, 1510 ("__kmp_suspend_template: T#%d timeout wakeup\n", th_gtid)); 1511 } else { 1512 KF_TRACE(2, ("__kmp_suspend_template: T#%d timeout wakeup, sleep bit " 1513 "not set!\n", 1514 th_gtid)); 1515 } 1516 } else if (flag->is_sleeping()) { 1517 KF_TRACE(100, 1518 ("__kmp_suspend_template: T#%d spurious wakeup\n", th_gtid)); 1519 } 1520 #endif 1521 } // while 1522 1523 // Mark the thread as active again (if it was previous marked as inactive) 1524 if (deactivated) { 1525 th->th.th_active = TRUE; 1526 if (TCR_4(th->th.th_in_pool)) { 1527 KMP_ATOMIC_INC(&__kmp_thread_pool_active_nth); 1528 th->th.th_active_in_pool = TRUE; 1529 } 1530 } 1531 } 1532 #ifdef DEBUG_SUSPEND 1533 { 1534 char buffer[128]; 1535 __kmp_print_cond(buffer, &th->th.th_suspend_cv); 1536 __kmp_printf("__kmp_suspend_template: T#%d has awakened: %s\n", th_gtid, 1537 buffer); 1538 } 1539 #endif 1540 1541 status = pthread_mutex_unlock(&th->th.th_suspend_mx.m_mutex); 1542 KMP_CHECK_SYSFAIL("pthread_mutex_unlock", status); 1543 KF_TRACE(30, ("__kmp_suspend_template: T#%d exit\n", th_gtid)); 1544 } 1545 1546 void __kmp_suspend_32(int th_gtid, kmp_flag_32 *flag) { 1547 __kmp_suspend_template(th_gtid, flag); 1548 } 1549 void __kmp_suspend_64(int th_gtid, kmp_flag_64 *flag) { 1550 __kmp_suspend_template(th_gtid, flag); 1551 } 1552 void __kmp_suspend_oncore(int th_gtid, kmp_flag_oncore *flag) { 1553 __kmp_suspend_template(th_gtid, flag); 1554 } 1555 1556 /* This routine signals the thread specified by target_gtid to wake up 1557 after setting the sleep bit indicated by the flag argument to FALSE. 1558 The target thread must already have called __kmp_suspend_template() */ 1559 template <class C> 1560 static inline void __kmp_resume_template(int target_gtid, C *flag) { 1561 KMP_TIME_DEVELOPER_PARTITIONED_BLOCK(USER_resume); 1562 kmp_info_t *th = __kmp_threads[target_gtid]; 1563 int status; 1564 1565 #ifdef KMP_DEBUG 1566 int gtid = TCR_4(__kmp_init_gtid) ? __kmp_get_gtid() : -1; 1567 #endif 1568 1569 KF_TRACE(30, ("__kmp_resume_template: T#%d wants to wakeup T#%d enter\n", 1570 gtid, target_gtid)); 1571 KMP_DEBUG_ASSERT(gtid != target_gtid); 1572 1573 __kmp_suspend_initialize_thread(th); 1574 1575 status = pthread_mutex_lock(&th->th.th_suspend_mx.m_mutex); 1576 KMP_CHECK_SYSFAIL("pthread_mutex_lock", status); 1577 1578 if (!flag) { // coming from __kmp_null_resume_wrapper 1579 flag = (C *)CCAST(void *, th->th.th_sleep_loc); 1580 } 1581 1582 // First, check if the flag is null or its type has changed. If so, someone 1583 // else woke it up. 1584 if (!flag || flag->get_type() != flag->get_ptr_type()) { // get_ptr_type 1585 // simply shows what 1586 // flag was cast to 1587 KF_TRACE(5, ("__kmp_resume_template: T#%d exiting, thread T#%d already " 1588 "awake: flag(%p)\n", 1589 gtid, target_gtid, NULL)); 1590 status = pthread_mutex_unlock(&th->th.th_suspend_mx.m_mutex); 1591 KMP_CHECK_SYSFAIL("pthread_mutex_unlock", status); 1592 return; 1593 } else { // if multiple threads are sleeping, flag should be internally 1594 // referring to a specific thread here 1595 typename C::flag_t old_spin = flag->unset_sleeping(); 1596 if (!flag->is_sleeping_val(old_spin)) { 1597 KF_TRACE(5, ("__kmp_resume_template: T#%d exiting, thread T#%d already " 1598 "awake: flag(%p): " 1599 "%u => %u\n", 1600 gtid, target_gtid, flag->get(), old_spin, flag->load())); 1601 status = pthread_mutex_unlock(&th->th.th_suspend_mx.m_mutex); 1602 KMP_CHECK_SYSFAIL("pthread_mutex_unlock", status); 1603 return; 1604 } 1605 KF_TRACE(5, ("__kmp_resume_template: T#%d about to wakeup T#%d, reset " 1606 "sleep bit for flag's loc(%p): " 1607 "%u => %u\n", 1608 gtid, target_gtid, flag->get(), old_spin, flag->load())); 1609 } 1610 TCW_PTR(th->th.th_sleep_loc, NULL); 1611 1612 #ifdef DEBUG_SUSPEND 1613 { 1614 char buffer[128]; 1615 __kmp_print_cond(buffer, &th->th.th_suspend_cv); 1616 __kmp_printf("__kmp_resume_template: T#%d resuming T#%d: %s\n", gtid, 1617 target_gtid, buffer); 1618 } 1619 #endif 1620 status = pthread_cond_signal(&th->th.th_suspend_cv.c_cond); 1621 KMP_CHECK_SYSFAIL("pthread_cond_signal", status); 1622 status = pthread_mutex_unlock(&th->th.th_suspend_mx.m_mutex); 1623 KMP_CHECK_SYSFAIL("pthread_mutex_unlock", status); 1624 KF_TRACE(30, ("__kmp_resume_template: T#%d exiting after signaling wake up" 1625 " for T#%d\n", 1626 gtid, target_gtid)); 1627 } 1628 1629 void __kmp_resume_32(int target_gtid, kmp_flag_32 *flag) { 1630 __kmp_resume_template(target_gtid, flag); 1631 } 1632 void __kmp_resume_64(int target_gtid, kmp_flag_64 *flag) { 1633 __kmp_resume_template(target_gtid, flag); 1634 } 1635 void __kmp_resume_oncore(int target_gtid, kmp_flag_oncore *flag) { 1636 __kmp_resume_template(target_gtid, flag); 1637 } 1638 1639 #if KMP_USE_MONITOR 1640 void __kmp_resume_monitor() { 1641 KMP_TIME_DEVELOPER_PARTITIONED_BLOCK(USER_resume); 1642 int status; 1643 #ifdef KMP_DEBUG 1644 int gtid = TCR_4(__kmp_init_gtid) ? __kmp_get_gtid() : -1; 1645 KF_TRACE(30, ("__kmp_resume_monitor: T#%d wants to wakeup T#%d enter\n", gtid, 1646 KMP_GTID_MONITOR)); 1647 KMP_DEBUG_ASSERT(gtid != KMP_GTID_MONITOR); 1648 #endif 1649 status = pthread_mutex_lock(&__kmp_wait_mx.m_mutex); 1650 KMP_CHECK_SYSFAIL("pthread_mutex_lock", status); 1651 #ifdef DEBUG_SUSPEND 1652 { 1653 char buffer[128]; 1654 __kmp_print_cond(buffer, &__kmp_wait_cv.c_cond); 1655 __kmp_printf("__kmp_resume_monitor: T#%d resuming T#%d: %s\n", gtid, 1656 KMP_GTID_MONITOR, buffer); 1657 } 1658 #endif 1659 status = pthread_cond_signal(&__kmp_wait_cv.c_cond); 1660 KMP_CHECK_SYSFAIL("pthread_cond_signal", status); 1661 status = pthread_mutex_unlock(&__kmp_wait_mx.m_mutex); 1662 KMP_CHECK_SYSFAIL("pthread_mutex_unlock", status); 1663 KF_TRACE(30, ("__kmp_resume_monitor: T#%d exiting after signaling wake up" 1664 " for T#%d\n", 1665 gtid, KMP_GTID_MONITOR)); 1666 } 1667 #endif // KMP_USE_MONITOR 1668 1669 void __kmp_yield(int cond) { 1670 if (!cond) 1671 return; 1672 #if KMP_USE_MONITOR 1673 if (!__kmp_yielding_on) 1674 return; 1675 #else 1676 if (__kmp_yield_cycle && !KMP_YIELD_NOW()) 1677 return; 1678 #endif 1679 sched_yield(); 1680 } 1681 1682 void __kmp_gtid_set_specific(int gtid) { 1683 if (__kmp_init_gtid) { 1684 int status; 1685 status = pthread_setspecific(__kmp_gtid_threadprivate_key, 1686 (void *)(intptr_t)(gtid + 1)); 1687 KMP_CHECK_SYSFAIL("pthread_setspecific", status); 1688 } else { 1689 KA_TRACE(50, ("__kmp_gtid_set_specific: runtime shutdown, returning\n")); 1690 } 1691 } 1692 1693 int __kmp_gtid_get_specific() { 1694 int gtid; 1695 if (!__kmp_init_gtid) { 1696 KA_TRACE(50, ("__kmp_gtid_get_specific: runtime shutdown, returning " 1697 "KMP_GTID_SHUTDOWN\n")); 1698 return KMP_GTID_SHUTDOWN; 1699 } 1700 gtid = (int)(size_t)pthread_getspecific(__kmp_gtid_threadprivate_key); 1701 if (gtid == 0) { 1702 gtid = KMP_GTID_DNE; 1703 } else { 1704 gtid--; 1705 } 1706 KA_TRACE(50, ("__kmp_gtid_get_specific: key:%d gtid:%d\n", 1707 __kmp_gtid_threadprivate_key, gtid)); 1708 return gtid; 1709 } 1710 1711 double __kmp_read_cpu_time(void) { 1712 /*clock_t t;*/ 1713 struct tms buffer; 1714 1715 /*t =*/times(&buffer); 1716 1717 return (buffer.tms_utime + buffer.tms_cutime) / (double)CLOCKS_PER_SEC; 1718 } 1719 1720 int __kmp_read_system_info(struct kmp_sys_info *info) { 1721 int status; 1722 struct rusage r_usage; 1723 1724 memset(info, 0, sizeof(*info)); 1725 1726 status = getrusage(RUSAGE_SELF, &r_usage); 1727 KMP_CHECK_SYSFAIL_ERRNO("getrusage", status); 1728 1729 // The maximum resident set size utilized (in kilobytes) 1730 info->maxrss = r_usage.ru_maxrss; 1731 // The number of page faults serviced without any I/O 1732 info->minflt = r_usage.ru_minflt; 1733 // The number of page faults serviced that required I/O 1734 info->majflt = r_usage.ru_majflt; 1735 // The number of times a process was "swapped" out of memory 1736 info->nswap = r_usage.ru_nswap; 1737 // The number of times the file system had to perform input 1738 info->inblock = r_usage.ru_inblock; 1739 // The number of times the file system had to perform output 1740 info->oublock = r_usage.ru_oublock; 1741 // The number of times a context switch was voluntarily 1742 info->nvcsw = r_usage.ru_nvcsw; 1743 // The number of times a context switch was forced 1744 info->nivcsw = r_usage.ru_nivcsw; 1745 1746 return (status != 0); 1747 } 1748 1749 void __kmp_read_system_time(double *delta) { 1750 double t_ns; 1751 struct timeval tval; 1752 struct timespec stop; 1753 int status; 1754 1755 status = gettimeofday(&tval, NULL); 1756 KMP_CHECK_SYSFAIL_ERRNO("gettimeofday", status); 1757 TIMEVAL_TO_TIMESPEC(&tval, &stop); 1758 t_ns = TS2NS(stop) - TS2NS(__kmp_sys_timer_data.start); 1759 *delta = (t_ns * 1e-9); 1760 } 1761 1762 void __kmp_clear_system_time(void) { 1763 struct timeval tval; 1764 int status; 1765 status = gettimeofday(&tval, NULL); 1766 KMP_CHECK_SYSFAIL_ERRNO("gettimeofday", status); 1767 TIMEVAL_TO_TIMESPEC(&tval, &__kmp_sys_timer_data.start); 1768 } 1769 1770 static int __kmp_get_xproc(void) { 1771 1772 int r = 0; 1773 1774 #if KMP_OS_LINUX || KMP_OS_DRAGONFLY || KMP_OS_FREEBSD || KMP_OS_NETBSD || \ 1775 KMP_OS_OPENBSD || KMP_OS_HURD 1776 1777 r = sysconf(_SC_NPROCESSORS_ONLN); 1778 1779 #elif KMP_OS_DARWIN 1780 1781 // Bug C77011 High "OpenMP Threads and number of active cores". 1782 1783 // Find the number of available CPUs. 1784 kern_return_t rc; 1785 host_basic_info_data_t info; 1786 mach_msg_type_number_t num = HOST_BASIC_INFO_COUNT; 1787 rc = host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)&info, &num); 1788 if (rc == 0 && num == HOST_BASIC_INFO_COUNT) { 1789 // Cannot use KA_TRACE() here because this code works before trace support 1790 // is initialized. 1791 r = info.avail_cpus; 1792 } else { 1793 KMP_WARNING(CantGetNumAvailCPU); 1794 KMP_INFORM(AssumedNumCPU); 1795 } 1796 1797 #else 1798 1799 #error "Unknown or unsupported OS." 1800 1801 #endif 1802 1803 return r > 0 ? r : 2; /* guess value of 2 if OS told us 0 */ 1804 1805 } // __kmp_get_xproc 1806 1807 int __kmp_read_from_file(char const *path, char const *format, ...) { 1808 int result; 1809 va_list args; 1810 1811 va_start(args, format); 1812 FILE *f = fopen(path, "rb"); 1813 if (f == NULL) 1814 return 0; 1815 result = vfscanf(f, format, args); 1816 fclose(f); 1817 1818 return result; 1819 } 1820 1821 void __kmp_runtime_initialize(void) { 1822 int status; 1823 pthread_mutexattr_t mutex_attr; 1824 pthread_condattr_t cond_attr; 1825 1826 if (__kmp_init_runtime) { 1827 return; 1828 } 1829 1830 #if (KMP_ARCH_X86 || KMP_ARCH_X86_64) 1831 if (!__kmp_cpuinfo.initialized) { 1832 __kmp_query_cpuid(&__kmp_cpuinfo); 1833 } 1834 #endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */ 1835 1836 __kmp_xproc = __kmp_get_xproc(); 1837 1838 if (sysconf(_SC_THREADS)) { 1839 1840 /* Query the maximum number of threads */ 1841 __kmp_sys_max_nth = sysconf(_SC_THREAD_THREADS_MAX); 1842 if (__kmp_sys_max_nth == -1) { 1843 /* Unlimited threads for NPTL */ 1844 __kmp_sys_max_nth = INT_MAX; 1845 } else if (__kmp_sys_max_nth <= 1) { 1846 /* Can't tell, just use PTHREAD_THREADS_MAX */ 1847 __kmp_sys_max_nth = KMP_MAX_NTH; 1848 } 1849 1850 /* Query the minimum stack size */ 1851 __kmp_sys_min_stksize = sysconf(_SC_THREAD_STACK_MIN); 1852 if (__kmp_sys_min_stksize <= 1) { 1853 __kmp_sys_min_stksize = KMP_MIN_STKSIZE; 1854 } 1855 } 1856 1857 /* Set up minimum number of threads to switch to TLS gtid */ 1858 __kmp_tls_gtid_min = KMP_TLS_GTID_MIN; 1859 1860 status = pthread_key_create(&__kmp_gtid_threadprivate_key, 1861 __kmp_internal_end_dest); 1862 KMP_CHECK_SYSFAIL("pthread_key_create", status); 1863 status = pthread_mutexattr_init(&mutex_attr); 1864 KMP_CHECK_SYSFAIL("pthread_mutexattr_init", status); 1865 status = pthread_mutex_init(&__kmp_wait_mx.m_mutex, &mutex_attr); 1866 KMP_CHECK_SYSFAIL("pthread_mutex_init", status); 1867 status = pthread_condattr_init(&cond_attr); 1868 KMP_CHECK_SYSFAIL("pthread_condattr_init", status); 1869 status = pthread_cond_init(&__kmp_wait_cv.c_cond, &cond_attr); 1870 KMP_CHECK_SYSFAIL("pthread_cond_init", status); 1871 #if USE_ITT_BUILD 1872 __kmp_itt_initialize(); 1873 #endif /* USE_ITT_BUILD */ 1874 1875 __kmp_init_runtime = TRUE; 1876 } 1877 1878 void __kmp_runtime_destroy(void) { 1879 int status; 1880 1881 if (!__kmp_init_runtime) { 1882 return; // Nothing to do. 1883 } 1884 1885 #if USE_ITT_BUILD 1886 __kmp_itt_destroy(); 1887 #endif /* USE_ITT_BUILD */ 1888 1889 status = pthread_key_delete(__kmp_gtid_threadprivate_key); 1890 KMP_CHECK_SYSFAIL("pthread_key_delete", status); 1891 1892 status = pthread_mutex_destroy(&__kmp_wait_mx.m_mutex); 1893 if (status != 0 && status != EBUSY) { 1894 KMP_SYSFAIL("pthread_mutex_destroy", status); 1895 } 1896 status = pthread_cond_destroy(&__kmp_wait_cv.c_cond); 1897 if (status != 0 && status != EBUSY) { 1898 KMP_SYSFAIL("pthread_cond_destroy", status); 1899 } 1900 #if KMP_AFFINITY_SUPPORTED 1901 __kmp_affinity_uninitialize(); 1902 #endif 1903 1904 __kmp_init_runtime = FALSE; 1905 } 1906 1907 /* Put the thread to sleep for a time period */ 1908 /* NOTE: not currently used anywhere */ 1909 void __kmp_thread_sleep(int millis) { sleep((millis + 500) / 1000); } 1910 1911 /* Calculate the elapsed wall clock time for the user */ 1912 void __kmp_elapsed(double *t) { 1913 int status; 1914 #ifdef FIX_SGI_CLOCK 1915 struct timespec ts; 1916 1917 status = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts); 1918 KMP_CHECK_SYSFAIL_ERRNO("clock_gettime", status); 1919 *t = 1920 (double)ts.tv_nsec * (1.0 / (double)KMP_NSEC_PER_SEC) + (double)ts.tv_sec; 1921 #else 1922 struct timeval tv; 1923 1924 status = gettimeofday(&tv, NULL); 1925 KMP_CHECK_SYSFAIL_ERRNO("gettimeofday", status); 1926 *t = 1927 (double)tv.tv_usec * (1.0 / (double)KMP_USEC_PER_SEC) + (double)tv.tv_sec; 1928 #endif 1929 } 1930 1931 /* Calculate the elapsed wall clock tick for the user */ 1932 void __kmp_elapsed_tick(double *t) { *t = 1 / (double)CLOCKS_PER_SEC; } 1933 1934 /* Return the current time stamp in nsec */ 1935 kmp_uint64 __kmp_now_nsec() { 1936 struct timeval t; 1937 gettimeofday(&t, NULL); 1938 return KMP_NSEC_PER_SEC * t.tv_sec + 1000 * t.tv_usec; 1939 } 1940 1941 #if KMP_ARCH_X86 || KMP_ARCH_X86_64 1942 /* Measure clock ticks per millisecond */ 1943 void __kmp_initialize_system_tick() { 1944 kmp_uint64 delay = 100000; // 50~100 usec on most machines. 1945 kmp_uint64 nsec = __kmp_now_nsec(); 1946 kmp_uint64 goal = __kmp_hardware_timestamp() + delay; 1947 kmp_uint64 now; 1948 while ((now = __kmp_hardware_timestamp()) < goal) 1949 ; 1950 __kmp_ticks_per_msec = 1951 (kmp_uint64)(1e6 * (delay + (now - goal)) / (__kmp_now_nsec() - nsec)); 1952 } 1953 #endif 1954 1955 /* Determine whether the given address is mapped into the current address 1956 space. */ 1957 1958 int __kmp_is_address_mapped(void *addr) { 1959 1960 int found = 0; 1961 int rc; 1962 1963 #if KMP_OS_LINUX || KMP_OS_FREEBSD || KMP_OS_HURD 1964 1965 /* On GNUish OSes, read the /proc/<pid>/maps pseudo-file to get all the address 1966 ranges mapped into the address space. */ 1967 1968 char *name = __kmp_str_format("/proc/%d/maps", getpid()); 1969 FILE *file = NULL; 1970 1971 file = fopen(name, "r"); 1972 KMP_ASSERT(file != NULL); 1973 1974 for (;;) { 1975 1976 void *beginning = NULL; 1977 void *ending = NULL; 1978 char perms[5]; 1979 1980 rc = fscanf(file, "%p-%p %4s %*[^\n]\n", &beginning, &ending, perms); 1981 if (rc == EOF) { 1982 break; 1983 } 1984 KMP_ASSERT(rc == 3 && 1985 KMP_STRLEN(perms) == 4); // Make sure all fields are read. 1986 1987 // Ending address is not included in the region, but beginning is. 1988 if ((addr >= beginning) && (addr < ending)) { 1989 perms[2] = 0; // 3th and 4th character does not matter. 1990 if (strcmp(perms, "rw") == 0) { 1991 // Memory we are looking for should be readable and writable. 1992 found = 1; 1993 } 1994 break; 1995 } 1996 } 1997 1998 // Free resources. 1999 fclose(file); 2000 KMP_INTERNAL_FREE(name); 2001 2002 #elif KMP_OS_DARWIN 2003 2004 /* On OS X*, /proc pseudo filesystem is not available. Try to read memory 2005 using vm interface. */ 2006 2007 int buffer; 2008 vm_size_t count; 2009 rc = vm_read_overwrite( 2010 mach_task_self(), // Task to read memory of. 2011 (vm_address_t)(addr), // Address to read from. 2012 1, // Number of bytes to be read. 2013 (vm_address_t)(&buffer), // Address of buffer to save read bytes in. 2014 &count // Address of var to save number of read bytes in. 2015 ); 2016 if (rc == 0) { 2017 // Memory successfully read. 2018 found = 1; 2019 } 2020 2021 #elif KMP_OS_NETBSD 2022 2023 int mib[5]; 2024 mib[0] = CTL_VM; 2025 mib[1] = VM_PROC; 2026 mib[2] = VM_PROC_MAP; 2027 mib[3] = getpid(); 2028 mib[4] = sizeof(struct kinfo_vmentry); 2029 2030 size_t size; 2031 rc = sysctl(mib, __arraycount(mib), NULL, &size, NULL, 0); 2032 KMP_ASSERT(!rc); 2033 KMP_ASSERT(size); 2034 2035 size = size * 4 / 3; 2036 struct kinfo_vmentry *kiv = (struct kinfo_vmentry *)KMP_INTERNAL_MALLOC(size); 2037 KMP_ASSERT(kiv); 2038 2039 rc = sysctl(mib, __arraycount(mib), kiv, &size, NULL, 0); 2040 KMP_ASSERT(!rc); 2041 KMP_ASSERT(size); 2042 2043 for (size_t i = 0; i < size; i++) { 2044 if (kiv[i].kve_start >= (uint64_t)addr && 2045 kiv[i].kve_end <= (uint64_t)addr) { 2046 found = 1; 2047 break; 2048 } 2049 } 2050 KMP_INTERNAL_FREE(kiv); 2051 #elif KMP_OS_DRAGONFLY || KMP_OS_OPENBSD 2052 2053 // FIXME(DragonFly, OpenBSD): Implement this 2054 found = 1; 2055 2056 #else 2057 2058 #error "Unknown or unsupported OS" 2059 2060 #endif 2061 2062 return found; 2063 2064 } // __kmp_is_address_mapped 2065 2066 #ifdef USE_LOAD_BALANCE 2067 2068 #if KMP_OS_DARWIN || KMP_OS_NETBSD 2069 2070 // The function returns the rounded value of the system load average 2071 // during given time interval which depends on the value of 2072 // __kmp_load_balance_interval variable (default is 60 sec, other values 2073 // may be 300 sec or 900 sec). 2074 // It returns -1 in case of error. 2075 int __kmp_get_load_balance(int max) { 2076 double averages[3]; 2077 int ret_avg = 0; 2078 2079 int res = getloadavg(averages, 3); 2080 2081 // Check __kmp_load_balance_interval to determine which of averages to use. 2082 // getloadavg() may return the number of samples less than requested that is 2083 // less than 3. 2084 if (__kmp_load_balance_interval < 180 && (res >= 1)) { 2085 ret_avg = averages[0]; // 1 min 2086 } else if ((__kmp_load_balance_interval >= 180 && 2087 __kmp_load_balance_interval < 600) && 2088 (res >= 2)) { 2089 ret_avg = averages[1]; // 5 min 2090 } else if ((__kmp_load_balance_interval >= 600) && (res == 3)) { 2091 ret_avg = averages[2]; // 15 min 2092 } else { // Error occurred 2093 return -1; 2094 } 2095 2096 return ret_avg; 2097 } 2098 2099 #else // Linux* OS 2100 2101 // The fuction returns number of running (not sleeping) threads, or -1 in case 2102 // of error. Error could be reported if Linux* OS kernel too old (without 2103 // "/proc" support). Counting running threads stops if max running threads 2104 // encountered. 2105 int __kmp_get_load_balance(int max) { 2106 static int permanent_error = 0; 2107 static int glb_running_threads = 0; // Saved count of the running threads for 2108 // the thread balance algortihm 2109 static double glb_call_time = 0; /* Thread balance algorithm call time */ 2110 2111 int running_threads = 0; // Number of running threads in the system. 2112 2113 DIR *proc_dir = NULL; // Handle of "/proc/" directory. 2114 struct dirent *proc_entry = NULL; 2115 2116 kmp_str_buf_t task_path; // "/proc/<pid>/task/<tid>/" path. 2117 DIR *task_dir = NULL; // Handle of "/proc/<pid>/task/<tid>/" directory. 2118 struct dirent *task_entry = NULL; 2119 int task_path_fixed_len; 2120 2121 kmp_str_buf_t stat_path; // "/proc/<pid>/task/<tid>/stat" path. 2122 int stat_file = -1; 2123 int stat_path_fixed_len; 2124 2125 int total_processes = 0; // Total number of processes in system. 2126 int total_threads = 0; // Total number of threads in system. 2127 2128 double call_time = 0.0; 2129 2130 __kmp_str_buf_init(&task_path); 2131 __kmp_str_buf_init(&stat_path); 2132 2133 __kmp_elapsed(&call_time); 2134 2135 if (glb_call_time && 2136 (call_time - glb_call_time < __kmp_load_balance_interval)) { 2137 running_threads = glb_running_threads; 2138 goto finish; 2139 } 2140 2141 glb_call_time = call_time; 2142 2143 // Do not spend time on scanning "/proc/" if we have a permanent error. 2144 if (permanent_error) { 2145 running_threads = -1; 2146 goto finish; 2147 } 2148 2149 if (max <= 0) { 2150 max = INT_MAX; 2151 } 2152 2153 // Open "/proc/" directory. 2154 proc_dir = opendir("/proc"); 2155 if (proc_dir == NULL) { 2156 // Cannot open "/prroc/". Probably the kernel does not support it. Return an 2157 // error now and in subsequent calls. 2158 running_threads = -1; 2159 permanent_error = 1; 2160 goto finish; 2161 } 2162 2163 // Initialize fixed part of task_path. This part will not change. 2164 __kmp_str_buf_cat(&task_path, "/proc/", 6); 2165 task_path_fixed_len = task_path.used; // Remember number of used characters. 2166 2167 proc_entry = readdir(proc_dir); 2168 while (proc_entry != NULL) { 2169 // Proc entry is a directory and name starts with a digit. Assume it is a 2170 // process' directory. 2171 if (proc_entry->d_type == DT_DIR && isdigit(proc_entry->d_name[0])) { 2172 2173 ++total_processes; 2174 // Make sure init process is the very first in "/proc", so we can replace 2175 // strcmp( proc_entry->d_name, "1" ) == 0 with simpler total_processes == 2176 // 1. We are going to check that total_processes == 1 => d_name == "1" is 2177 // true (where "=>" is implication). Since C++ does not have => operator, 2178 // let us replace it with its equivalent: a => b == ! a || b. 2179 KMP_DEBUG_ASSERT(total_processes != 1 || 2180 strcmp(proc_entry->d_name, "1") == 0); 2181 2182 // Construct task_path. 2183 task_path.used = task_path_fixed_len; // Reset task_path to "/proc/". 2184 __kmp_str_buf_cat(&task_path, proc_entry->d_name, 2185 KMP_STRLEN(proc_entry->d_name)); 2186 __kmp_str_buf_cat(&task_path, "/task", 5); 2187 2188 task_dir = opendir(task_path.str); 2189 if (task_dir == NULL) { 2190 // Process can finish between reading "/proc/" directory entry and 2191 // opening process' "task/" directory. So, in general case we should not 2192 // complain, but have to skip this process and read the next one. But on 2193 // systems with no "task/" support we will spend lot of time to scan 2194 // "/proc/" tree again and again without any benefit. "init" process 2195 // (its pid is 1) should exist always, so, if we cannot open 2196 // "/proc/1/task/" directory, it means "task/" is not supported by 2197 // kernel. Report an error now and in the future. 2198 if (strcmp(proc_entry->d_name, "1") == 0) { 2199 running_threads = -1; 2200 permanent_error = 1; 2201 goto finish; 2202 } 2203 } else { 2204 // Construct fixed part of stat file path. 2205 __kmp_str_buf_clear(&stat_path); 2206 __kmp_str_buf_cat(&stat_path, task_path.str, task_path.used); 2207 __kmp_str_buf_cat(&stat_path, "/", 1); 2208 stat_path_fixed_len = stat_path.used; 2209 2210 task_entry = readdir(task_dir); 2211 while (task_entry != NULL) { 2212 // It is a directory and name starts with a digit. 2213 if (proc_entry->d_type == DT_DIR && isdigit(task_entry->d_name[0])) { 2214 ++total_threads; 2215 2216 // Consruct complete stat file path. Easiest way would be: 2217 // __kmp_str_buf_print( & stat_path, "%s/%s/stat", task_path.str, 2218 // task_entry->d_name ); 2219 // but seriae of __kmp_str_buf_cat works a bit faster. 2220 stat_path.used = 2221 stat_path_fixed_len; // Reset stat path to its fixed part. 2222 __kmp_str_buf_cat(&stat_path, task_entry->d_name, 2223 KMP_STRLEN(task_entry->d_name)); 2224 __kmp_str_buf_cat(&stat_path, "/stat", 5); 2225 2226 // Note: Low-level API (open/read/close) is used. High-level API 2227 // (fopen/fclose) works ~ 30 % slower. 2228 stat_file = open(stat_path.str, O_RDONLY); 2229 if (stat_file == -1) { 2230 // We cannot report an error because task (thread) can terminate 2231 // just before reading this file. 2232 } else { 2233 /* Content of "stat" file looks like: 2234 24285 (program) S ... 2235 2236 It is a single line (if program name does not include funny 2237 symbols). First number is a thread id, then name of executable 2238 file name in paretheses, then state of the thread. We need just 2239 thread state. 2240 2241 Good news: Length of program name is 15 characters max. Longer 2242 names are truncated. 2243 2244 Thus, we need rather short buffer: 15 chars for program name + 2245 2 parenthesis, + 3 spaces + ~7 digits of pid = 37. 2246 2247 Bad news: Program name may contain special symbols like space, 2248 closing parenthesis, or even new line. This makes parsing 2249 "stat" file not 100 % reliable. In case of fanny program names 2250 parsing may fail (report incorrect thread state). 2251 2252 Parsing "status" file looks more promissing (due to different 2253 file structure and escaping special symbols) but reading and 2254 parsing of "status" file works slower. 2255 -- ln 2256 */ 2257 char buffer[65]; 2258 int len; 2259 len = read(stat_file, buffer, sizeof(buffer) - 1); 2260 if (len >= 0) { 2261 buffer[len] = 0; 2262 // Using scanf: 2263 // sscanf( buffer, "%*d (%*s) %c ", & state ); 2264 // looks very nice, but searching for a closing parenthesis 2265 // works a bit faster. 2266 char *close_parent = strstr(buffer, ") "); 2267 if (close_parent != NULL) { 2268 char state = *(close_parent + 2); 2269 if (state == 'R') { 2270 ++running_threads; 2271 if (running_threads >= max) { 2272 goto finish; 2273 } 2274 } 2275 } 2276 } 2277 close(stat_file); 2278 stat_file = -1; 2279 } 2280 } 2281 task_entry = readdir(task_dir); 2282 } 2283 closedir(task_dir); 2284 task_dir = NULL; 2285 } 2286 } 2287 proc_entry = readdir(proc_dir); 2288 } 2289 2290 // There _might_ be a timing hole where the thread executing this 2291 // code get skipped in the load balance, and running_threads is 0. 2292 // Assert in the debug builds only!!! 2293 KMP_DEBUG_ASSERT(running_threads > 0); 2294 if (running_threads <= 0) { 2295 running_threads = 1; 2296 } 2297 2298 finish: // Clean up and exit. 2299 if (proc_dir != NULL) { 2300 closedir(proc_dir); 2301 } 2302 __kmp_str_buf_free(&task_path); 2303 if (task_dir != NULL) { 2304 closedir(task_dir); 2305 } 2306 __kmp_str_buf_free(&stat_path); 2307 if (stat_file != -1) { 2308 close(stat_file); 2309 } 2310 2311 glb_running_threads = running_threads; 2312 2313 return running_threads; 2314 2315 } // __kmp_get_load_balance 2316 2317 #endif // KMP_OS_DARWIN 2318 2319 #endif // USE_LOAD_BALANCE 2320 2321 #if !(KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_MIC || \ 2322 ((KMP_OS_LINUX || KMP_OS_DARWIN) && KMP_ARCH_AARCH64) || KMP_ARCH_PPC64) 2323 2324 // we really only need the case with 1 argument, because CLANG always build 2325 // a struct of pointers to shared variables referenced in the outlined function 2326 int __kmp_invoke_microtask(microtask_t pkfn, int gtid, int tid, int argc, 2327 void *p_argv[] 2328 #if OMPT_SUPPORT 2329 , 2330 void **exit_frame_ptr 2331 #endif 2332 ) { 2333 #if OMPT_SUPPORT 2334 *exit_frame_ptr = OMPT_GET_FRAME_ADDRESS(0); 2335 #endif 2336 2337 switch (argc) { 2338 default: 2339 fprintf(stderr, "Too many args to microtask: %d!\n", argc); 2340 fflush(stderr); 2341 exit(-1); 2342 case 0: 2343 (*pkfn)(>id, &tid); 2344 break; 2345 case 1: 2346 (*pkfn)(>id, &tid, p_argv[0]); 2347 break; 2348 case 2: 2349 (*pkfn)(>id, &tid, p_argv[0], p_argv[1]); 2350 break; 2351 case 3: 2352 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2]); 2353 break; 2354 case 4: 2355 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3]); 2356 break; 2357 case 5: 2358 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4]); 2359 break; 2360 case 6: 2361 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4], 2362 p_argv[5]); 2363 break; 2364 case 7: 2365 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4], 2366 p_argv[5], p_argv[6]); 2367 break; 2368 case 8: 2369 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4], 2370 p_argv[5], p_argv[6], p_argv[7]); 2371 break; 2372 case 9: 2373 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4], 2374 p_argv[5], p_argv[6], p_argv[7], p_argv[8]); 2375 break; 2376 case 10: 2377 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4], 2378 p_argv[5], p_argv[6], p_argv[7], p_argv[8], p_argv[9]); 2379 break; 2380 case 11: 2381 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4], 2382 p_argv[5], p_argv[6], p_argv[7], p_argv[8], p_argv[9], p_argv[10]); 2383 break; 2384 case 12: 2385 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4], 2386 p_argv[5], p_argv[6], p_argv[7], p_argv[8], p_argv[9], p_argv[10], 2387 p_argv[11]); 2388 break; 2389 case 13: 2390 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4], 2391 p_argv[5], p_argv[6], p_argv[7], p_argv[8], p_argv[9], p_argv[10], 2392 p_argv[11], p_argv[12]); 2393 break; 2394 case 14: 2395 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4], 2396 p_argv[5], p_argv[6], p_argv[7], p_argv[8], p_argv[9], p_argv[10], 2397 p_argv[11], p_argv[12], p_argv[13]); 2398 break; 2399 case 15: 2400 (*pkfn)(>id, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4], 2401 p_argv[5], p_argv[6], p_argv[7], p_argv[8], p_argv[9], p_argv[10], 2402 p_argv[11], p_argv[12], p_argv[13], p_argv[14]); 2403 break; 2404 } 2405 2406 #if OMPT_SUPPORT 2407 *exit_frame_ptr = 0; 2408 #endif 2409 2410 return 1; 2411 } 2412 2413 #endif 2414 2415 // end of file // 2416