1 #ifndef _LINUX_SCHED_H 2 #define _LINUX_SCHED_H 3 4 #include <asm/param.h> /* for HZ */ 5 6 #include <linux/config.h> 7 #include <linux/capability.h> 8 #include <linux/threads.h> 9 #include <linux/kernel.h> 10 #include <linux/types.h> 11 #include <linux/timex.h> 12 #include <linux/jiffies.h> 13 #include <linux/rbtree.h> 14 #include <linux/thread_info.h> 15 #include <linux/cpumask.h> 16 #include <linux/errno.h> 17 #include <linux/nodemask.h> 18 19 #include <asm/system.h> 20 #include <asm/semaphore.h> 21 #include <asm/page.h> 22 #include <asm/ptrace.h> 23 #include <asm/mmu.h> 24 #include <asm/cputime.h> 25 26 #include <linux/smp.h> 27 #include <linux/sem.h> 28 #include <linux/signal.h> 29 #include <linux/securebits.h> 30 #include <linux/fs_struct.h> 31 #include <linux/compiler.h> 32 #include <linux/completion.h> 33 #include <linux/pid.h> 34 #include <linux/percpu.h> 35 #include <linux/topology.h> 36 #include <linux/seccomp.h> 37 #include <linux/rcupdate.h> 38 39 #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */ 40 41 struct exec_domain; 42 43 /* 44 * cloning flags: 45 */ 46 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ 47 #define CLONE_VM 0x00000100 /* set if VM shared between processes */ 48 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ 49 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ 50 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ 51 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ 52 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ 53 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ 54 #define CLONE_THREAD 0x00010000 /* Same thread group? */ 55 #define CLONE_NEWNS 0x00020000 /* New namespace group? */ 56 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ 57 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ 58 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ 59 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ 60 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ 61 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ 62 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ 63 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ 64 65 /* 66 * List of flags we want to share for kernel threads, 67 * if only because they are not used by them anyway. 68 */ 69 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 70 71 /* 72 * These are the constant used to fake the fixed-point load-average 73 * counting. Some notes: 74 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 75 * a load-average precision of 10 bits integer + 11 bits fractional 76 * - if you want to count load-averages more often, you need more 77 * precision, or rounding will get you. With 2-second counting freq, 78 * the EXP_n values would be 1981, 2034 and 2043 if still using only 79 * 11 bit fractions. 80 */ 81 extern unsigned long avenrun[]; /* Load averages */ 82 83 #define FSHIFT 11 /* nr of bits of precision */ 84 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 85 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */ 86 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 87 #define EXP_5 2014 /* 1/exp(5sec/5min) */ 88 #define EXP_15 2037 /* 1/exp(5sec/15min) */ 89 90 #define CALC_LOAD(load,exp,n) \ 91 load *= exp; \ 92 load += n*(FIXED_1-exp); \ 93 load >>= FSHIFT; 94 95 extern unsigned long total_forks; 96 extern int nr_threads; 97 extern int last_pid; 98 DECLARE_PER_CPU(unsigned long, process_counts); 99 extern int nr_processes(void); 100 extern unsigned long nr_running(void); 101 extern unsigned long nr_uninterruptible(void); 102 extern unsigned long nr_iowait(void); 103 104 #include <linux/time.h> 105 #include <linux/param.h> 106 #include <linux/resource.h> 107 #include <linux/timer.h> 108 #include <linux/hrtimer.h> 109 110 #include <asm/processor.h> 111 112 /* 113 * Task state bitmask. NOTE! These bits are also 114 * encoded in fs/proc/array.c: get_task_state(). 115 * 116 * We have two separate sets of flags: task->state 117 * is about runnability, while task->exit_state are 118 * about the task exiting. Confusing, but this way 119 * modifying one set can't modify the other one by 120 * mistake. 121 */ 122 #define TASK_RUNNING 0 123 #define TASK_INTERRUPTIBLE 1 124 #define TASK_UNINTERRUPTIBLE 2 125 #define TASK_STOPPED 4 126 #define TASK_TRACED 8 127 /* in tsk->exit_state */ 128 #define EXIT_ZOMBIE 16 129 #define EXIT_DEAD 32 130 /* in tsk->state again */ 131 #define TASK_NONINTERACTIVE 64 132 133 #define __set_task_state(tsk, state_value) \ 134 do { (tsk)->state = (state_value); } while (0) 135 #define set_task_state(tsk, state_value) \ 136 set_mb((tsk)->state, (state_value)) 137 138 /* 139 * set_current_state() includes a barrier so that the write of current->state 140 * is correctly serialised wrt the caller's subsequent test of whether to 141 * actually sleep: 142 * 143 * set_current_state(TASK_UNINTERRUPTIBLE); 144 * if (do_i_need_to_sleep()) 145 * schedule(); 146 * 147 * If the caller does not need such serialisation then use __set_current_state() 148 */ 149 #define __set_current_state(state_value) \ 150 do { current->state = (state_value); } while (0) 151 #define set_current_state(state_value) \ 152 set_mb(current->state, (state_value)) 153 154 /* Task command name length */ 155 #define TASK_COMM_LEN 16 156 157 /* 158 * Scheduling policies 159 */ 160 #define SCHED_NORMAL 0 161 #define SCHED_FIFO 1 162 #define SCHED_RR 2 163 164 struct sched_param { 165 int sched_priority; 166 }; 167 168 #ifdef __KERNEL__ 169 170 #include <linux/spinlock.h> 171 172 /* 173 * This serializes "schedule()" and also protects 174 * the run-queue from deletions/modifications (but 175 * _adding_ to the beginning of the run-queue has 176 * a separate lock). 177 */ 178 extern rwlock_t tasklist_lock; 179 extern spinlock_t mmlist_lock; 180 181 typedef struct task_struct task_t; 182 183 extern void sched_init(void); 184 extern void sched_init_smp(void); 185 extern void init_idle(task_t *idle, int cpu); 186 187 extern cpumask_t nohz_cpu_mask; 188 189 extern void show_state(void); 190 extern void show_regs(struct pt_regs *); 191 192 /* 193 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 194 * task), SP is the stack pointer of the first frame that should be shown in the back 195 * trace (or NULL if the entire call-chain of the task should be shown). 196 */ 197 extern void show_stack(struct task_struct *task, unsigned long *sp); 198 199 void io_schedule(void); 200 long io_schedule_timeout(long timeout); 201 202 extern void cpu_init (void); 203 extern void trap_init(void); 204 extern void update_process_times(int user); 205 extern void scheduler_tick(void); 206 207 #ifdef CONFIG_DETECT_SOFTLOCKUP 208 extern void softlockup_tick(struct pt_regs *regs); 209 extern void spawn_softlockup_task(void); 210 extern void touch_softlockup_watchdog(void); 211 #else 212 static inline void softlockup_tick(struct pt_regs *regs) 213 { 214 } 215 static inline void spawn_softlockup_task(void) 216 { 217 } 218 static inline void touch_softlockup_watchdog(void) 219 { 220 } 221 #endif 222 223 224 /* Attach to any functions which should be ignored in wchan output. */ 225 #define __sched __attribute__((__section__(".sched.text"))) 226 /* Is this address in the __sched functions? */ 227 extern int in_sched_functions(unsigned long addr); 228 229 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 230 extern signed long FASTCALL(schedule_timeout(signed long timeout)); 231 extern signed long schedule_timeout_interruptible(signed long timeout); 232 extern signed long schedule_timeout_uninterruptible(signed long timeout); 233 asmlinkage void schedule(void); 234 235 struct namespace; 236 237 /* Maximum number of active map areas.. This is a random (large) number */ 238 #define DEFAULT_MAX_MAP_COUNT 65536 239 240 extern int sysctl_max_map_count; 241 242 #include <linux/aio.h> 243 244 extern unsigned long 245 arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 246 unsigned long, unsigned long); 247 extern unsigned long 248 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 249 unsigned long len, unsigned long pgoff, 250 unsigned long flags); 251 extern void arch_unmap_area(struct mm_struct *, unsigned long); 252 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 253 254 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 255 /* 256 * The mm counters are not protected by its page_table_lock, 257 * so must be incremented atomically. 258 */ 259 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 260 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 261 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 262 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 263 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 264 typedef atomic_long_t mm_counter_t; 265 266 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 267 /* 268 * The mm counters are protected by its page_table_lock, 269 * so can be incremented directly. 270 */ 271 #define set_mm_counter(mm, member, value) (mm)->_##member = (value) 272 #define get_mm_counter(mm, member) ((mm)->_##member) 273 #define add_mm_counter(mm, member, value) (mm)->_##member += (value) 274 #define inc_mm_counter(mm, member) (mm)->_##member++ 275 #define dec_mm_counter(mm, member) (mm)->_##member-- 276 typedef unsigned long mm_counter_t; 277 278 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 279 280 #define get_mm_rss(mm) \ 281 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 282 #define update_hiwater_rss(mm) do { \ 283 unsigned long _rss = get_mm_rss(mm); \ 284 if ((mm)->hiwater_rss < _rss) \ 285 (mm)->hiwater_rss = _rss; \ 286 } while (0) 287 #define update_hiwater_vm(mm) do { \ 288 if ((mm)->hiwater_vm < (mm)->total_vm) \ 289 (mm)->hiwater_vm = (mm)->total_vm; \ 290 } while (0) 291 292 struct mm_struct { 293 struct vm_area_struct * mmap; /* list of VMAs */ 294 struct rb_root mm_rb; 295 struct vm_area_struct * mmap_cache; /* last find_vma result */ 296 unsigned long (*get_unmapped_area) (struct file *filp, 297 unsigned long addr, unsigned long len, 298 unsigned long pgoff, unsigned long flags); 299 void (*unmap_area) (struct mm_struct *mm, unsigned long addr); 300 unsigned long mmap_base; /* base of mmap area */ 301 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ 302 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ 303 pgd_t * pgd; 304 atomic_t mm_users; /* How many users with user space? */ 305 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ 306 int map_count; /* number of VMAs */ 307 struct rw_semaphore mmap_sem; 308 spinlock_t page_table_lock; /* Protects page tables and some counters */ 309 310 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung 311 * together off init_mm.mmlist, and are protected 312 * by mmlist_lock 313 */ 314 315 /* Special counters, in some configurations protected by the 316 * page_table_lock, in other configurations by being atomic. 317 */ 318 mm_counter_t _file_rss; 319 mm_counter_t _anon_rss; 320 321 unsigned long hiwater_rss; /* High-watermark of RSS usage */ 322 unsigned long hiwater_vm; /* High-water virtual memory usage */ 323 324 unsigned long total_vm, locked_vm, shared_vm, exec_vm; 325 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; 326 unsigned long start_code, end_code, start_data, end_data; 327 unsigned long start_brk, brk, start_stack; 328 unsigned long arg_start, arg_end, env_start, env_end; 329 330 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ 331 332 unsigned dumpable:2; 333 cpumask_t cpu_vm_mask; 334 335 /* Architecture-specific MM context */ 336 mm_context_t context; 337 338 /* Token based thrashing protection. */ 339 unsigned long swap_token_time; 340 char recent_pagein; 341 342 /* coredumping support */ 343 int core_waiters; 344 struct completion *core_startup_done, core_done; 345 346 /* aio bits */ 347 rwlock_t ioctx_list_lock; 348 struct kioctx *ioctx_list; 349 }; 350 351 struct sighand_struct { 352 atomic_t count; 353 struct k_sigaction action[_NSIG]; 354 spinlock_t siglock; 355 struct rcu_head rcu; 356 }; 357 358 extern void sighand_free_cb(struct rcu_head *rhp); 359 360 static inline void sighand_free(struct sighand_struct *sp) 361 { 362 call_rcu(&sp->rcu, sighand_free_cb); 363 } 364 365 /* 366 * NOTE! "signal_struct" does not have it's own 367 * locking, because a shared signal_struct always 368 * implies a shared sighand_struct, so locking 369 * sighand_struct is always a proper superset of 370 * the locking of signal_struct. 371 */ 372 struct signal_struct { 373 atomic_t count; 374 atomic_t live; 375 376 wait_queue_head_t wait_chldexit; /* for wait4() */ 377 378 /* current thread group signal load-balancing target: */ 379 task_t *curr_target; 380 381 /* shared signal handling: */ 382 struct sigpending shared_pending; 383 384 /* thread group exit support */ 385 int group_exit_code; 386 /* overloaded: 387 * - notify group_exit_task when ->count is equal to notify_count 388 * - everyone except group_exit_task is stopped during signal delivery 389 * of fatal signals, group_exit_task processes the signal. 390 */ 391 struct task_struct *group_exit_task; 392 int notify_count; 393 394 /* thread group stop support, overloads group_exit_code too */ 395 int group_stop_count; 396 unsigned int flags; /* see SIGNAL_* flags below */ 397 398 /* POSIX.1b Interval Timers */ 399 struct list_head posix_timers; 400 401 /* ITIMER_REAL timer for the process */ 402 struct hrtimer real_timer; 403 ktime_t it_real_incr; 404 405 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 406 cputime_t it_prof_expires, it_virt_expires; 407 cputime_t it_prof_incr, it_virt_incr; 408 409 /* job control IDs */ 410 pid_t pgrp; 411 pid_t tty_old_pgrp; 412 pid_t session; 413 /* boolean value for session group leader */ 414 int leader; 415 416 struct tty_struct *tty; /* NULL if no tty */ 417 418 /* 419 * Cumulative resource counters for dead threads in the group, 420 * and for reaped dead child processes forked by this group. 421 * Live threads maintain their own counters and add to these 422 * in __exit_signal, except for the group leader. 423 */ 424 cputime_t utime, stime, cutime, cstime; 425 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 426 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 427 428 /* 429 * Cumulative ns of scheduled CPU time for dead threads in the 430 * group, not including a zombie group leader. (This only differs 431 * from jiffies_to_ns(utime + stime) if sched_clock uses something 432 * other than jiffies.) 433 */ 434 unsigned long long sched_time; 435 436 /* 437 * We don't bother to synchronize most readers of this at all, 438 * because there is no reader checking a limit that actually needs 439 * to get both rlim_cur and rlim_max atomically, and either one 440 * alone is a single word that can safely be read normally. 441 * getrlimit/setrlimit use task_lock(current->group_leader) to 442 * protect this instead of the siglock, because they really 443 * have no need to disable irqs. 444 */ 445 struct rlimit rlim[RLIM_NLIMITS]; 446 447 struct list_head cpu_timers[3]; 448 449 /* keep the process-shared keyrings here so that they do the right 450 * thing in threads created with CLONE_THREAD */ 451 #ifdef CONFIG_KEYS 452 struct key *session_keyring; /* keyring inherited over fork */ 453 struct key *process_keyring; /* keyring private to this process */ 454 #endif 455 }; 456 457 /* Context switch must be unlocked if interrupts are to be enabled */ 458 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 459 # define __ARCH_WANT_UNLOCKED_CTXSW 460 #endif 461 462 /* 463 * Bits in flags field of signal_struct. 464 */ 465 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 466 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 467 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 468 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 469 470 471 /* 472 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 473 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are 474 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values 475 * are inverted: lower p->prio value means higher priority. 476 * 477 * The MAX_USER_RT_PRIO value allows the actual maximum 478 * RT priority to be separate from the value exported to 479 * user-space. This allows kernel threads to set their 480 * priority to a value higher than any user task. Note: 481 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 482 */ 483 484 #define MAX_USER_RT_PRIO 100 485 #define MAX_RT_PRIO MAX_USER_RT_PRIO 486 487 #define MAX_PRIO (MAX_RT_PRIO + 40) 488 489 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO)) 490 491 /* 492 * Some day this will be a full-fledged user tracking system.. 493 */ 494 struct user_struct { 495 atomic_t __count; /* reference count */ 496 atomic_t processes; /* How many processes does this user have? */ 497 atomic_t files; /* How many open files does this user have? */ 498 atomic_t sigpending; /* How many pending signals does this user have? */ 499 #ifdef CONFIG_INOTIFY 500 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 501 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 502 #endif 503 /* protected by mq_lock */ 504 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 505 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 506 507 #ifdef CONFIG_KEYS 508 struct key *uid_keyring; /* UID specific keyring */ 509 struct key *session_keyring; /* UID's default session keyring */ 510 #endif 511 512 /* Hash table maintenance information */ 513 struct list_head uidhash_list; 514 uid_t uid; 515 }; 516 517 extern struct user_struct *find_user(uid_t); 518 519 extern struct user_struct root_user; 520 #define INIT_USER (&root_user) 521 522 typedef struct prio_array prio_array_t; 523 struct backing_dev_info; 524 struct reclaim_state; 525 526 #ifdef CONFIG_SCHEDSTATS 527 struct sched_info { 528 /* cumulative counters */ 529 unsigned long cpu_time, /* time spent on the cpu */ 530 run_delay, /* time spent waiting on a runqueue */ 531 pcnt; /* # of timeslices run on this cpu */ 532 533 /* timestamps */ 534 unsigned long last_arrival, /* when we last ran on a cpu */ 535 last_queued; /* when we were last queued to run */ 536 }; 537 538 extern struct file_operations proc_schedstat_operations; 539 #endif 540 541 enum idle_type 542 { 543 SCHED_IDLE, 544 NOT_IDLE, 545 NEWLY_IDLE, 546 MAX_IDLE_TYPES 547 }; 548 549 /* 550 * sched-domains (multiprocessor balancing) declarations: 551 */ 552 #ifdef CONFIG_SMP 553 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */ 554 555 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 556 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 557 #define SD_BALANCE_EXEC 4 /* Balance on exec */ 558 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 559 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 560 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 561 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 562 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 563 564 struct sched_group { 565 struct sched_group *next; /* Must be a circular list */ 566 cpumask_t cpumask; 567 568 /* 569 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 570 * single CPU. This is read only (except for setup, hotplug CPU). 571 */ 572 unsigned long cpu_power; 573 }; 574 575 struct sched_domain { 576 /* These fields must be setup */ 577 struct sched_domain *parent; /* top domain must be null terminated */ 578 struct sched_group *groups; /* the balancing groups of the domain */ 579 cpumask_t span; /* span of all CPUs in this domain */ 580 unsigned long min_interval; /* Minimum balance interval ms */ 581 unsigned long max_interval; /* Maximum balance interval ms */ 582 unsigned int busy_factor; /* less balancing by factor if busy */ 583 unsigned int imbalance_pct; /* No balance until over watermark */ 584 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */ 585 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 586 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */ 587 unsigned int busy_idx; 588 unsigned int idle_idx; 589 unsigned int newidle_idx; 590 unsigned int wake_idx; 591 unsigned int forkexec_idx; 592 int flags; /* See SD_* */ 593 594 /* Runtime fields. */ 595 unsigned long last_balance; /* init to jiffies. units in jiffies */ 596 unsigned int balance_interval; /* initialise to 1. units in ms. */ 597 unsigned int nr_balance_failed; /* initialise to 0 */ 598 599 #ifdef CONFIG_SCHEDSTATS 600 /* load_balance() stats */ 601 unsigned long lb_cnt[MAX_IDLE_TYPES]; 602 unsigned long lb_failed[MAX_IDLE_TYPES]; 603 unsigned long lb_balanced[MAX_IDLE_TYPES]; 604 unsigned long lb_imbalance[MAX_IDLE_TYPES]; 605 unsigned long lb_gained[MAX_IDLE_TYPES]; 606 unsigned long lb_hot_gained[MAX_IDLE_TYPES]; 607 unsigned long lb_nobusyg[MAX_IDLE_TYPES]; 608 unsigned long lb_nobusyq[MAX_IDLE_TYPES]; 609 610 /* Active load balancing */ 611 unsigned long alb_cnt; 612 unsigned long alb_failed; 613 unsigned long alb_pushed; 614 615 /* SD_BALANCE_EXEC stats */ 616 unsigned long sbe_cnt; 617 unsigned long sbe_balanced; 618 unsigned long sbe_pushed; 619 620 /* SD_BALANCE_FORK stats */ 621 unsigned long sbf_cnt; 622 unsigned long sbf_balanced; 623 unsigned long sbf_pushed; 624 625 /* try_to_wake_up() stats */ 626 unsigned long ttwu_wake_remote; 627 unsigned long ttwu_move_affine; 628 unsigned long ttwu_move_balance; 629 #endif 630 }; 631 632 extern void partition_sched_domains(cpumask_t *partition1, 633 cpumask_t *partition2); 634 #endif /* CONFIG_SMP */ 635 636 637 struct io_context; /* See blkdev.h */ 638 void exit_io_context(void); 639 struct cpuset; 640 641 #define NGROUPS_SMALL 32 642 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) 643 struct group_info { 644 int ngroups; 645 atomic_t usage; 646 gid_t small_block[NGROUPS_SMALL]; 647 int nblocks; 648 gid_t *blocks[0]; 649 }; 650 651 /* 652 * get_group_info() must be called with the owning task locked (via task_lock()) 653 * when task != current. The reason being that the vast majority of callers are 654 * looking at current->group_info, which can not be changed except by the 655 * current task. Changing current->group_info requires the task lock, too. 656 */ 657 #define get_group_info(group_info) do { \ 658 atomic_inc(&(group_info)->usage); \ 659 } while (0) 660 661 #define put_group_info(group_info) do { \ 662 if (atomic_dec_and_test(&(group_info)->usage)) \ 663 groups_free(group_info); \ 664 } while (0) 665 666 extern struct group_info *groups_alloc(int gidsetsize); 667 extern void groups_free(struct group_info *group_info); 668 extern int set_current_groups(struct group_info *group_info); 669 extern int groups_search(struct group_info *group_info, gid_t grp); 670 /* access the groups "array" with this macro */ 671 #define GROUP_AT(gi, i) \ 672 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) 673 674 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 675 extern void prefetch_stack(struct task_struct*); 676 #else 677 static inline void prefetch_stack(struct task_struct *t) { } 678 #endif 679 680 struct audit_context; /* See audit.c */ 681 struct mempolicy; 682 683 struct task_struct { 684 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 685 struct thread_info *thread_info; 686 atomic_t usage; 687 unsigned long flags; /* per process flags, defined below */ 688 unsigned long ptrace; 689 690 int lock_depth; /* BKL lock depth */ 691 692 #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW) 693 int oncpu; 694 #endif 695 int prio, static_prio; 696 struct list_head run_list; 697 prio_array_t *array; 698 699 unsigned short ioprio; 700 701 unsigned long sleep_avg; 702 unsigned long long timestamp, last_ran; 703 unsigned long long sched_time; /* sched_clock time spent running */ 704 int activated; 705 706 unsigned long policy; 707 cpumask_t cpus_allowed; 708 unsigned int time_slice, first_time_slice; 709 710 #ifdef CONFIG_SCHEDSTATS 711 struct sched_info sched_info; 712 #endif 713 714 struct list_head tasks; 715 /* 716 * ptrace_list/ptrace_children forms the list of my children 717 * that were stolen by a ptracer. 718 */ 719 struct list_head ptrace_children; 720 struct list_head ptrace_list; 721 722 struct mm_struct *mm, *active_mm; 723 724 /* task state */ 725 struct linux_binfmt *binfmt; 726 long exit_state; 727 int exit_code, exit_signal; 728 int pdeath_signal; /* The signal sent when the parent dies */ 729 /* ??? */ 730 unsigned long personality; 731 unsigned did_exec:1; 732 pid_t pid; 733 pid_t tgid; 734 /* 735 * pointers to (original) parent process, youngest child, younger sibling, 736 * older sibling, respectively. (p->father can be replaced with 737 * p->parent->pid) 738 */ 739 struct task_struct *real_parent; /* real parent process (when being debugged) */ 740 struct task_struct *parent; /* parent process */ 741 /* 742 * children/sibling forms the list of my children plus the 743 * tasks I'm ptracing. 744 */ 745 struct list_head children; /* list of my children */ 746 struct list_head sibling; /* linkage in my parent's children list */ 747 struct task_struct *group_leader; /* threadgroup leader */ 748 749 /* PID/PID hash table linkage. */ 750 struct pid pids[PIDTYPE_MAX]; 751 752 struct completion *vfork_done; /* for vfork() */ 753 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 754 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 755 756 unsigned long rt_priority; 757 cputime_t utime, stime; 758 unsigned long nvcsw, nivcsw; /* context switch counts */ 759 struct timespec start_time; 760 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 761 unsigned long min_flt, maj_flt; 762 763 cputime_t it_prof_expires, it_virt_expires; 764 unsigned long long it_sched_expires; 765 struct list_head cpu_timers[3]; 766 767 /* process credentials */ 768 uid_t uid,euid,suid,fsuid; 769 gid_t gid,egid,sgid,fsgid; 770 struct group_info *group_info; 771 kernel_cap_t cap_effective, cap_inheritable, cap_permitted; 772 unsigned keep_capabilities:1; 773 struct user_struct *user; 774 #ifdef CONFIG_KEYS 775 struct key *request_key_auth; /* assumed request_key authority */ 776 struct key *thread_keyring; /* keyring private to this thread */ 777 unsigned char jit_keyring; /* default keyring to attach requested keys to */ 778 #endif 779 int oomkilladj; /* OOM kill score adjustment (bit shift). */ 780 char comm[TASK_COMM_LEN]; /* executable name excluding path 781 - access with [gs]et_task_comm (which lock 782 it with task_lock()) 783 - initialized normally by flush_old_exec */ 784 /* file system info */ 785 int link_count, total_link_count; 786 /* ipc stuff */ 787 struct sysv_sem sysvsem; 788 /* CPU-specific state of this task */ 789 struct thread_struct thread; 790 /* filesystem information */ 791 struct fs_struct *fs; 792 /* open file information */ 793 struct files_struct *files; 794 /* namespace */ 795 struct namespace *namespace; 796 /* signal handlers */ 797 struct signal_struct *signal; 798 struct sighand_struct *sighand; 799 800 sigset_t blocked, real_blocked; 801 struct sigpending pending; 802 803 unsigned long sas_ss_sp; 804 size_t sas_ss_size; 805 int (*notifier)(void *priv); 806 void *notifier_data; 807 sigset_t *notifier_mask; 808 809 void *security; 810 struct audit_context *audit_context; 811 seccomp_t seccomp; 812 813 /* Thread group tracking */ 814 u32 parent_exec_id; 815 u32 self_exec_id; 816 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 817 spinlock_t alloc_lock; 818 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */ 819 spinlock_t proc_lock; 820 821 #ifdef CONFIG_DEBUG_MUTEXES 822 /* mutex deadlock detection */ 823 struct mutex_waiter *blocked_on; 824 #endif 825 826 /* journalling filesystem info */ 827 void *journal_info; 828 829 /* VM state */ 830 struct reclaim_state *reclaim_state; 831 832 struct dentry *proc_dentry; 833 struct backing_dev_info *backing_dev_info; 834 835 struct io_context *io_context; 836 837 unsigned long ptrace_message; 838 siginfo_t *last_siginfo; /* For ptrace use. */ 839 /* 840 * current io wait handle: wait queue entry to use for io waits 841 * If this thread is processing aio, this points at the waitqueue 842 * inside the currently handled kiocb. It may be NULL (i.e. default 843 * to a stack based synchronous wait) if its doing sync IO. 844 */ 845 wait_queue_t *io_wait; 846 /* i/o counters(bytes read/written, #syscalls */ 847 u64 rchar, wchar, syscr, syscw; 848 #if defined(CONFIG_BSD_PROCESS_ACCT) 849 u64 acct_rss_mem1; /* accumulated rss usage */ 850 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 851 clock_t acct_stimexpd; /* clock_t-converted stime since last update */ 852 #endif 853 #ifdef CONFIG_NUMA 854 struct mempolicy *mempolicy; 855 short il_next; 856 #endif 857 #ifdef CONFIG_CPUSETS 858 struct cpuset *cpuset; 859 nodemask_t mems_allowed; 860 int cpuset_mems_generation; 861 #endif 862 atomic_t fs_excl; /* holding fs exclusive resources */ 863 struct rcu_head rcu; 864 }; 865 866 static inline pid_t process_group(struct task_struct *tsk) 867 { 868 return tsk->signal->pgrp; 869 } 870 871 /** 872 * pid_alive - check that a task structure is not stale 873 * @p: Task structure to be checked. 874 * 875 * Test if a process is not yet dead (at most zombie state) 876 * If pid_alive fails, then pointers within the task structure 877 * can be stale and must not be dereferenced. 878 */ 879 static inline int pid_alive(struct task_struct *p) 880 { 881 return p->pids[PIDTYPE_PID].nr != 0; 882 } 883 884 extern void free_task(struct task_struct *tsk); 885 extern void __put_task_struct(struct task_struct *tsk); 886 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 887 888 extern void __put_task_struct_cb(struct rcu_head *rhp); 889 890 static inline void put_task_struct(struct task_struct *t) 891 { 892 if (atomic_dec_and_test(&t->usage)) 893 call_rcu(&t->rcu, __put_task_struct_cb); 894 } 895 896 /* 897 * Per process flags 898 */ 899 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 900 /* Not implemented yet, only for 486*/ 901 #define PF_STARTING 0x00000002 /* being created */ 902 #define PF_EXITING 0x00000004 /* getting shut down */ 903 #define PF_DEAD 0x00000008 /* Dead */ 904 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 905 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 906 #define PF_DUMPCORE 0x00000200 /* dumped core */ 907 #define PF_SIGNALED 0x00000400 /* killed by a signal */ 908 #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 909 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 910 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 911 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */ 912 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 913 #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 914 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 915 #define PF_KSWAPD 0x00040000 /* I am kswapd */ 916 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 917 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 918 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */ 919 #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */ 920 #define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */ 921 #define PF_SWAPWRITE 0x01000000 /* Allowed to write to swap */ 922 923 /* 924 * Only the _current_ task can read/write to tsk->flags, but other 925 * tasks can access tsk->flags in readonly mode for example 926 * with tsk_used_math (like during threaded core dumping). 927 * There is however an exception to this rule during ptrace 928 * or during fork: the ptracer task is allowed to write to the 929 * child->flags of its traced child (same goes for fork, the parent 930 * can write to the child->flags), because we're guaranteed the 931 * child is not running and in turn not changing child->flags 932 * at the same time the parent does it. 933 */ 934 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 935 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 936 #define clear_used_math() clear_stopped_child_used_math(current) 937 #define set_used_math() set_stopped_child_used_math(current) 938 #define conditional_stopped_child_used_math(condition, child) \ 939 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 940 #define conditional_used_math(condition) \ 941 conditional_stopped_child_used_math(condition, current) 942 #define copy_to_stopped_child_used_math(child) \ 943 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 944 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 945 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 946 #define used_math() tsk_used_math(current) 947 948 #ifdef CONFIG_SMP 949 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask); 950 #else 951 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask) 952 { 953 if (!cpu_isset(0, new_mask)) 954 return -EINVAL; 955 return 0; 956 } 957 #endif 958 959 extern unsigned long long sched_clock(void); 960 extern unsigned long long current_sched_time(const task_t *current_task); 961 962 /* sched_exec is called by processes performing an exec */ 963 #ifdef CONFIG_SMP 964 extern void sched_exec(void); 965 #else 966 #define sched_exec() {} 967 #endif 968 969 #ifdef CONFIG_HOTPLUG_CPU 970 extern void idle_task_exit(void); 971 #else 972 static inline void idle_task_exit(void) {} 973 #endif 974 975 extern void sched_idle_next(void); 976 extern void set_user_nice(task_t *p, long nice); 977 extern int task_prio(const task_t *p); 978 extern int task_nice(const task_t *p); 979 extern int can_nice(const task_t *p, const int nice); 980 extern int task_curr(const task_t *p); 981 extern int idle_cpu(int cpu); 982 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 983 extern task_t *idle_task(int cpu); 984 extern task_t *curr_task(int cpu); 985 extern void set_curr_task(int cpu, task_t *p); 986 987 void yield(void); 988 989 /* 990 * The default (Linux) execution domain. 991 */ 992 extern struct exec_domain default_exec_domain; 993 994 union thread_union { 995 struct thread_info thread_info; 996 unsigned long stack[THREAD_SIZE/sizeof(long)]; 997 }; 998 999 #ifndef __HAVE_ARCH_KSTACK_END 1000 static inline int kstack_end(void *addr) 1001 { 1002 /* Reliable end of stack detection: 1003 * Some APM bios versions misalign the stack 1004 */ 1005 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 1006 } 1007 #endif 1008 1009 extern union thread_union init_thread_union; 1010 extern struct task_struct init_task; 1011 1012 extern struct mm_struct init_mm; 1013 1014 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr) 1015 extern struct task_struct *find_task_by_pid_type(int type, int pid); 1016 extern void set_special_pids(pid_t session, pid_t pgrp); 1017 extern void __set_special_pids(pid_t session, pid_t pgrp); 1018 1019 /* per-UID process charging. */ 1020 extern struct user_struct * alloc_uid(uid_t); 1021 static inline struct user_struct *get_uid(struct user_struct *u) 1022 { 1023 atomic_inc(&u->__count); 1024 return u; 1025 } 1026 extern void free_uid(struct user_struct *); 1027 extern void switch_uid(struct user_struct *); 1028 1029 #include <asm/current.h> 1030 1031 extern void do_timer(struct pt_regs *); 1032 1033 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); 1034 extern int FASTCALL(wake_up_process(struct task_struct * tsk)); 1035 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, 1036 unsigned long clone_flags)); 1037 #ifdef CONFIG_SMP 1038 extern void kick_process(struct task_struct *tsk); 1039 #else 1040 static inline void kick_process(struct task_struct *tsk) { } 1041 #endif 1042 extern void FASTCALL(sched_fork(task_t * p, int clone_flags)); 1043 extern void FASTCALL(sched_exit(task_t * p)); 1044 1045 extern int in_group_p(gid_t); 1046 extern int in_egroup_p(gid_t); 1047 1048 extern void proc_caches_init(void); 1049 extern void flush_signals(struct task_struct *); 1050 extern void flush_signal_handlers(struct task_struct *, int force_default); 1051 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 1052 1053 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 1054 { 1055 unsigned long flags; 1056 int ret; 1057 1058 spin_lock_irqsave(&tsk->sighand->siglock, flags); 1059 ret = dequeue_signal(tsk, mask, info); 1060 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 1061 1062 return ret; 1063 } 1064 1065 extern void block_all_signals(int (*notifier)(void *priv), void *priv, 1066 sigset_t *mask); 1067 extern void unblock_all_signals(void); 1068 extern void release_task(struct task_struct * p); 1069 extern int send_sig_info(int, struct siginfo *, struct task_struct *); 1070 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); 1071 extern int force_sigsegv(int, struct task_struct *); 1072 extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1073 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp); 1074 extern int kill_pg_info(int, struct siginfo *, pid_t); 1075 extern int kill_proc_info(int, struct siginfo *, pid_t); 1076 extern int kill_proc_info_as_uid(int, struct siginfo *, pid_t, uid_t, uid_t); 1077 extern void do_notify_parent(struct task_struct *, int); 1078 extern void force_sig(int, struct task_struct *); 1079 extern void force_sig_specific(int, struct task_struct *); 1080 extern int send_sig(int, struct task_struct *, int); 1081 extern void zap_other_threads(struct task_struct *p); 1082 extern int kill_pg(pid_t, int, int); 1083 extern int kill_sl(pid_t, int, int); 1084 extern int kill_proc(pid_t, int, int); 1085 extern struct sigqueue *sigqueue_alloc(void); 1086 extern void sigqueue_free(struct sigqueue *); 1087 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); 1088 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); 1089 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *); 1090 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1091 1092 /* These can be the second arg to send_sig_info/send_group_sig_info. */ 1093 #define SEND_SIG_NOINFO ((struct siginfo *) 0) 1094 #define SEND_SIG_PRIV ((struct siginfo *) 1) 1095 #define SEND_SIG_FORCED ((struct siginfo *) 2) 1096 1097 static inline int is_si_special(const struct siginfo *info) 1098 { 1099 return info <= SEND_SIG_FORCED; 1100 } 1101 1102 /* True if we are on the alternate signal stack. */ 1103 1104 static inline int on_sig_stack(unsigned long sp) 1105 { 1106 return (sp - current->sas_ss_sp < current->sas_ss_size); 1107 } 1108 1109 static inline int sas_ss_flags(unsigned long sp) 1110 { 1111 return (current->sas_ss_size == 0 ? SS_DISABLE 1112 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1113 } 1114 1115 1116 #ifdef CONFIG_SECURITY 1117 /* code is in security.c */ 1118 extern int capable(int cap); 1119 #else 1120 static inline int capable(int cap) 1121 { 1122 if (cap_raised(current->cap_effective, cap)) { 1123 current->flags |= PF_SUPERPRIV; 1124 return 1; 1125 } 1126 return 0; 1127 } 1128 #endif 1129 1130 /* 1131 * Routines for handling mm_structs 1132 */ 1133 extern struct mm_struct * mm_alloc(void); 1134 1135 /* mmdrop drops the mm and the page tables */ 1136 extern void FASTCALL(__mmdrop(struct mm_struct *)); 1137 static inline void mmdrop(struct mm_struct * mm) 1138 { 1139 if (atomic_dec_and_test(&mm->mm_count)) 1140 __mmdrop(mm); 1141 } 1142 1143 /* mmput gets rid of the mappings and all user-space */ 1144 extern void mmput(struct mm_struct *); 1145 /* Grab a reference to a task's mm, if it is not already going away */ 1146 extern struct mm_struct *get_task_mm(struct task_struct *task); 1147 /* Remove the current tasks stale references to the old mm_struct */ 1148 extern void mm_release(struct task_struct *, struct mm_struct *); 1149 1150 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1151 extern void flush_thread(void); 1152 extern void exit_thread(void); 1153 1154 extern void exit_files(struct task_struct *); 1155 extern void exit_signal(struct task_struct *); 1156 extern void __exit_signal(struct task_struct *); 1157 extern void exit_sighand(struct task_struct *); 1158 extern void __exit_sighand(struct task_struct *); 1159 extern void exit_itimers(struct signal_struct *); 1160 1161 extern NORET_TYPE void do_group_exit(int); 1162 1163 extern void daemonize(const char *, ...); 1164 extern int allow_signal(int); 1165 extern int disallow_signal(int); 1166 extern task_t *child_reaper; 1167 1168 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1169 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1170 task_t *fork_idle(int); 1171 1172 extern void set_task_comm(struct task_struct *tsk, char *from); 1173 extern void get_task_comm(char *to, struct task_struct *tsk); 1174 1175 #ifdef CONFIG_SMP 1176 extern void wait_task_inactive(task_t * p); 1177 #else 1178 #define wait_task_inactive(p) do { } while (0) 1179 #endif 1180 1181 #define remove_parent(p) list_del_init(&(p)->sibling) 1182 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children) 1183 1184 #define REMOVE_LINKS(p) do { \ 1185 if (thread_group_leader(p)) \ 1186 list_del_init(&(p)->tasks); \ 1187 remove_parent(p); \ 1188 } while (0) 1189 1190 #define SET_LINKS(p) do { \ 1191 if (thread_group_leader(p)) \ 1192 list_add_tail(&(p)->tasks,&init_task.tasks); \ 1193 add_parent(p, (p)->parent); \ 1194 } while (0) 1195 1196 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks) 1197 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks) 1198 1199 #define for_each_process(p) \ 1200 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1201 1202 /* 1203 * Careful: do_each_thread/while_each_thread is a double loop so 1204 * 'break' will not work as expected - use goto instead. 1205 */ 1206 #define do_each_thread(g, t) \ 1207 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1208 1209 #define while_each_thread(g, t) \ 1210 while ((t = next_thread(t)) != g) 1211 1212 extern task_t * FASTCALL(next_thread(const task_t *p)); 1213 1214 #define thread_group_leader(p) (p->pid == p->tgid) 1215 1216 static inline int thread_group_empty(task_t *p) 1217 { 1218 return list_empty(&p->pids[PIDTYPE_TGID].pid_list); 1219 } 1220 1221 #define delay_group_leader(p) \ 1222 (thread_group_leader(p) && !thread_group_empty(p)) 1223 1224 extern void unhash_process(struct task_struct *p); 1225 1226 /* 1227 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring 1228 * subscriptions and synchronises with wait4(). Also used in procfs. Also 1229 * pins the final release of task.io_context. Also protects ->cpuset. 1230 * 1231 * Nests both inside and outside of read_lock(&tasklist_lock). 1232 * It must not be nested with write_lock_irq(&tasklist_lock), 1233 * neither inside nor outside. 1234 */ 1235 static inline void task_lock(struct task_struct *p) 1236 { 1237 spin_lock(&p->alloc_lock); 1238 } 1239 1240 static inline void task_unlock(struct task_struct *p) 1241 { 1242 spin_unlock(&p->alloc_lock); 1243 } 1244 1245 #ifndef __HAVE_THREAD_FUNCTIONS 1246 1247 #define task_thread_info(task) (task)->thread_info 1248 1249 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 1250 { 1251 *task_thread_info(p) = *task_thread_info(org); 1252 task_thread_info(p)->task = p; 1253 } 1254 1255 static inline unsigned long *end_of_stack(struct task_struct *p) 1256 { 1257 return (unsigned long *)(p->thread_info + 1); 1258 } 1259 1260 #endif 1261 1262 /* set thread flags in other task's structures 1263 * - see asm/thread_info.h for TIF_xxxx flags available 1264 */ 1265 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1266 { 1267 set_ti_thread_flag(task_thread_info(tsk), flag); 1268 } 1269 1270 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1271 { 1272 clear_ti_thread_flag(task_thread_info(tsk), flag); 1273 } 1274 1275 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1276 { 1277 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 1278 } 1279 1280 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1281 { 1282 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 1283 } 1284 1285 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1286 { 1287 return test_ti_thread_flag(task_thread_info(tsk), flag); 1288 } 1289 1290 static inline void set_tsk_need_resched(struct task_struct *tsk) 1291 { 1292 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1293 } 1294 1295 static inline void clear_tsk_need_resched(struct task_struct *tsk) 1296 { 1297 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1298 } 1299 1300 static inline int signal_pending(struct task_struct *p) 1301 { 1302 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 1303 } 1304 1305 static inline int need_resched(void) 1306 { 1307 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 1308 } 1309 1310 /* 1311 * cond_resched() and cond_resched_lock(): latency reduction via 1312 * explicit rescheduling in places that are safe. The return 1313 * value indicates whether a reschedule was done in fact. 1314 * cond_resched_lock() will drop the spinlock before scheduling, 1315 * cond_resched_softirq() will enable bhs before scheduling. 1316 */ 1317 extern int cond_resched(void); 1318 extern int cond_resched_lock(spinlock_t * lock); 1319 extern int cond_resched_softirq(void); 1320 1321 /* 1322 * Does a critical section need to be broken due to another 1323 * task waiting?: 1324 */ 1325 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) 1326 # define need_lockbreak(lock) ((lock)->break_lock) 1327 #else 1328 # define need_lockbreak(lock) 0 1329 #endif 1330 1331 /* 1332 * Does a critical section need to be broken due to another 1333 * task waiting or preemption being signalled: 1334 */ 1335 static inline int lock_need_resched(spinlock_t *lock) 1336 { 1337 if (need_lockbreak(lock) || need_resched()) 1338 return 1; 1339 return 0; 1340 } 1341 1342 /* Reevaluate whether the task has signals pending delivery. 1343 This is required every time the blocked sigset_t changes. 1344 callers must hold sighand->siglock. */ 1345 1346 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t)); 1347 extern void recalc_sigpending(void); 1348 1349 extern void signal_wake_up(struct task_struct *t, int resume_stopped); 1350 1351 /* 1352 * Wrappers for p->thread_info->cpu access. No-op on UP. 1353 */ 1354 #ifdef CONFIG_SMP 1355 1356 static inline unsigned int task_cpu(const struct task_struct *p) 1357 { 1358 return task_thread_info(p)->cpu; 1359 } 1360 1361 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1362 { 1363 task_thread_info(p)->cpu = cpu; 1364 } 1365 1366 #else 1367 1368 static inline unsigned int task_cpu(const struct task_struct *p) 1369 { 1370 return 0; 1371 } 1372 1373 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1374 { 1375 } 1376 1377 #endif /* CONFIG_SMP */ 1378 1379 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1380 extern void arch_pick_mmap_layout(struct mm_struct *mm); 1381 #else 1382 static inline void arch_pick_mmap_layout(struct mm_struct *mm) 1383 { 1384 mm->mmap_base = TASK_UNMAPPED_BASE; 1385 mm->get_unmapped_area = arch_get_unmapped_area; 1386 mm->unmap_area = arch_unmap_area; 1387 } 1388 #endif 1389 1390 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); 1391 extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 1392 1393 #ifdef CONFIG_MAGIC_SYSRQ 1394 1395 extern void normalize_rt_tasks(void); 1396 1397 #endif 1398 1399 #ifdef CONFIG_PM 1400 /* 1401 * Check if a process has been frozen 1402 */ 1403 static inline int frozen(struct task_struct *p) 1404 { 1405 return p->flags & PF_FROZEN; 1406 } 1407 1408 /* 1409 * Check if there is a request to freeze a process 1410 */ 1411 static inline int freezing(struct task_struct *p) 1412 { 1413 return p->flags & PF_FREEZE; 1414 } 1415 1416 /* 1417 * Request that a process be frozen 1418 * FIXME: SMP problem. We may not modify other process' flags! 1419 */ 1420 static inline void freeze(struct task_struct *p) 1421 { 1422 p->flags |= PF_FREEZE; 1423 } 1424 1425 /* 1426 * Wake up a frozen process 1427 */ 1428 static inline int thaw_process(struct task_struct *p) 1429 { 1430 if (frozen(p)) { 1431 p->flags &= ~PF_FROZEN; 1432 wake_up_process(p); 1433 return 1; 1434 } 1435 return 0; 1436 } 1437 1438 /* 1439 * freezing is complete, mark process as frozen 1440 */ 1441 static inline void frozen_process(struct task_struct *p) 1442 { 1443 p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN; 1444 } 1445 1446 extern void refrigerator(void); 1447 extern int freeze_processes(void); 1448 extern void thaw_processes(void); 1449 1450 static inline int try_to_freeze(void) 1451 { 1452 if (freezing(current)) { 1453 refrigerator(); 1454 return 1; 1455 } else 1456 return 0; 1457 } 1458 #else 1459 static inline int frozen(struct task_struct *p) { return 0; } 1460 static inline int freezing(struct task_struct *p) { return 0; } 1461 static inline void freeze(struct task_struct *p) { BUG(); } 1462 static inline int thaw_process(struct task_struct *p) { return 1; } 1463 static inline void frozen_process(struct task_struct *p) { BUG(); } 1464 1465 static inline void refrigerator(void) {} 1466 static inline int freeze_processes(void) { BUG(); return 0; } 1467 static inline void thaw_processes(void) {} 1468 1469 static inline int try_to_freeze(void) { return 0; } 1470 1471 #endif /* CONFIG_PM */ 1472 #endif /* __KERNEL__ */ 1473 1474 #endif 1475