4 #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
9 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
10 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
11 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
12 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
13 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
14 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
15 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
16 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
17 #define CLONE_THREAD 0x00010000 /* Same thread group? */
18 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
19 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
20 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
21 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
22 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
23 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
24 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
25 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
26 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
31 #define SCHED_NORMAL 0
42 #include <asm/param.h> /* for HZ */
44 #include <linux/capability.h>
45 #include <linux/threads.h>
46 #include <linux/kernel.h>
47 #include <linux/types.h>
48 #include <linux/timex.h>
49 #include <linux/jiffies.h>
50 #include <linux/rbtree.h>
51 #include <linux/thread_info.h>
52 #include <linux/cpumask.h>
53 #include <linux/errno.h>
54 #include <linux/nodemask.h>
56 #include <asm/system.h>
57 #include <asm/semaphore.h>
59 #include <asm/ptrace.h>
61 #include <asm/cputime.h>
63 #include <linux/smp.h>
64 #include <linux/sem.h>
65 #include <linux/signal.h>
66 #include <linux/securebits.h>
67 #include <linux/fs_struct.h>
68 #include <linux/compiler.h>
69 #include <linux/completion.h>
70 #include <linux/pid.h>
71 #include <linux/percpu.h>
72 #include <linux/topology.h>
73 #include <linux/seccomp.h>
74 #include <linux/rcupdate.h>
75 #include <linux/futex.h>
76 #include <linux/rtmutex.h>
78 #include <linux/time.h>
79 #include <linux/param.h>
80 #include <linux/resource.h>
81 #include <linux/timer.h>
82 #include <linux/hrtimer.h>
84 #include <asm/processor.h>
87 struct futex_pi_state;
90 * List of flags we want to share for kernel threads,
91 * if only because they are not used by them anyway.
93 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
96 * These are the constant used to fake the fixed-point load-average
97 * counting. Some notes:
98 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
99 * a load-average precision of 10 bits integer + 11 bits fractional
100 * - if you want to count load-averages more often, you need more
101 * precision, or rounding will get you. With 2-second counting freq,
102 * the EXP_n values would be 1981, 2034 and 2043 if still using only
105 extern unsigned long avenrun[]; /* Load averages */
107 #define FSHIFT 11 /* nr of bits of precision */
108 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
109 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
110 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
111 #define EXP_5 2014 /* 1/exp(5sec/5min) */
112 #define EXP_15 2037 /* 1/exp(5sec/15min) */
114 #define CALC_LOAD(load,exp,n) \
116 load += n*(FIXED_1-exp); \
119 extern unsigned long total_forks;
120 extern int nr_threads;
122 DECLARE_PER_CPU(unsigned long, process_counts);
123 extern int nr_processes(void);
124 extern unsigned long nr_running(void);
125 extern unsigned long nr_uninterruptible(void);
126 extern unsigned long nr_active(void);
127 extern unsigned long nr_iowait(void);
128 extern unsigned long weighted_cpuload(const int cpu);
132 * Task state bitmask. NOTE! These bits are also
133 * encoded in fs/proc/array.c: get_task_state().
135 * We have two separate sets of flags: task->state
136 * is about runnability, while task->exit_state are
137 * about the task exiting. Confusing, but this way
138 * modifying one set can't modify the other one by
141 #define TASK_RUNNING 0
142 #define TASK_INTERRUPTIBLE 1
143 #define TASK_UNINTERRUPTIBLE 2
144 #define TASK_STOPPED 4
145 #define TASK_TRACED 8
146 /* in tsk->exit_state */
147 #define EXIT_ZOMBIE 16
149 /* in tsk->state again */
150 #define TASK_NONINTERACTIVE 64
152 #define __set_task_state(tsk, state_value) \
153 do { (tsk)->state = (state_value); } while (0)
154 #define set_task_state(tsk, state_value) \
155 set_mb((tsk)->state, (state_value))
158 * set_current_state() includes a barrier so that the write of current->state
159 * is correctly serialised wrt the caller's subsequent test of whether to
162 * set_current_state(TASK_UNINTERRUPTIBLE);
163 * if (do_i_need_to_sleep())
166 * If the caller does not need such serialisation then use __set_current_state()
168 #define __set_current_state(state_value) \
169 do { current->state = (state_value); } while (0)
170 #define set_current_state(state_value) \
171 set_mb(current->state, (state_value))
173 /* Task command name length */
174 #define TASK_COMM_LEN 16
176 #include <linux/spinlock.h>
179 * This serializes "schedule()" and also protects
180 * the run-queue from deletions/modifications (but
181 * _adding_ to the beginning of the run-queue has
184 extern rwlock_t tasklist_lock;
185 extern spinlock_t mmlist_lock;
189 extern void sched_init(void);
190 extern void sched_init_smp(void);
191 extern void init_idle(struct task_struct *idle, int cpu);
193 extern cpumask_t nohz_cpu_mask;
195 extern void show_state(void);
196 extern void show_regs(struct pt_regs *);
199 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
200 * task), SP is the stack pointer of the first frame that should be shown in the back
201 * trace (or NULL if the entire call-chain of the task should be shown).
203 extern void show_stack(struct task_struct *task, unsigned long *sp);
205 void io_schedule(void);
206 long io_schedule_timeout(long timeout);
208 extern void cpu_init (void);
209 extern void trap_init(void);
210 extern void update_process_times(int user);
211 extern void scheduler_tick(void);
213 #ifdef CONFIG_DETECT_SOFTLOCKUP
214 extern void softlockup_tick(void);
215 extern void spawn_softlockup_task(void);
216 extern void touch_softlockup_watchdog(void);
218 static inline void softlockup_tick(void)
221 static inline void spawn_softlockup_task(void)
224 static inline void touch_softlockup_watchdog(void)
230 /* Attach to any functions which should be ignored in wchan output. */
231 #define __sched __attribute__((__section__(".sched.text")))
232 /* Is this address in the __sched functions? */
233 extern int in_sched_functions(unsigned long addr);
235 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
236 extern signed long FASTCALL(schedule_timeout(signed long timeout));
237 extern signed long schedule_timeout_interruptible(signed long timeout);
238 extern signed long schedule_timeout_uninterruptible(signed long timeout);
239 asmlinkage void schedule(void);
243 /* Maximum number of active map areas.. This is a random (large) number */
244 #define DEFAULT_MAX_MAP_COUNT 65536
246 extern int sysctl_max_map_count;
248 #include <linux/aio.h>
251 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
252 unsigned long, unsigned long);
254 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
255 unsigned long len, unsigned long pgoff,
256 unsigned long flags);
257 extern void arch_unmap_area(struct mm_struct *, unsigned long);
258 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
260 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
262 * The mm counters are not protected by its page_table_lock,
263 * so must be incremented atomically.
265 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
266 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
267 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
268 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
269 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
270 typedef atomic_long_t mm_counter_t;
272 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
274 * The mm counters are protected by its page_table_lock,
275 * so can be incremented directly.
277 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
278 #define get_mm_counter(mm, member) ((mm)->_##member)
279 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
280 #define inc_mm_counter(mm, member) (mm)->_##member++
281 #define dec_mm_counter(mm, member) (mm)->_##member--
282 typedef unsigned long mm_counter_t;
284 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
286 #define get_mm_rss(mm) \
287 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
288 #define update_hiwater_rss(mm) do { \
289 unsigned long _rss = get_mm_rss(mm); \
290 if ((mm)->hiwater_rss < _rss) \
291 (mm)->hiwater_rss = _rss; \
293 #define update_hiwater_vm(mm) do { \
294 if ((mm)->hiwater_vm < (mm)->total_vm) \
295 (mm)->hiwater_vm = (mm)->total_vm; \
299 struct vm_area_struct * mmap; /* list of VMAs */
300 struct rb_root mm_rb;
301 struct vm_area_struct * mmap_cache; /* last find_vma result */
302 unsigned long (*get_unmapped_area) (struct file *filp,
303 unsigned long addr, unsigned long len,
304 unsigned long pgoff, unsigned long flags);
305 void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
306 unsigned long mmap_base; /* base of mmap area */
307 unsigned long task_size; /* size of task vm space */
308 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
309 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
311 atomic_t mm_users; /* How many users with user space? */
312 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
313 int map_count; /* number of VMAs */
314 struct rw_semaphore mmap_sem;
315 spinlock_t page_table_lock; /* Protects page tables and some counters */
317 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
318 * together off init_mm.mmlist, and are protected
322 /* Special counters, in some configurations protected by the
323 * page_table_lock, in other configurations by being atomic.
325 mm_counter_t _file_rss;
326 mm_counter_t _anon_rss;
328 unsigned long hiwater_rss; /* High-watermark of RSS usage */
329 unsigned long hiwater_vm; /* High-water virtual memory usage */
331 unsigned long total_vm, locked_vm, shared_vm, exec_vm;
332 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
333 unsigned long start_code, end_code, start_data, end_data;
334 unsigned long start_brk, brk, start_stack;
335 unsigned long arg_start, arg_end, env_start, env_end;
337 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
340 cpumask_t cpu_vm_mask;
342 /* Architecture-specific MM context */
343 mm_context_t context;
345 /* Token based thrashing protection. */
346 unsigned long swap_token_time;
349 /* coredumping support */
351 struct completion *core_startup_done, core_done;
354 rwlock_t ioctx_list_lock;
355 struct kioctx *ioctx_list;
358 struct sighand_struct {
360 struct k_sigaction action[_NSIG];
364 struct pacct_struct {
367 unsigned long ac_mem;
368 cputime_t ac_utime, ac_stime;
369 unsigned long ac_minflt, ac_majflt;
373 * NOTE! "signal_struct" does not have it's own
374 * locking, because a shared signal_struct always
375 * implies a shared sighand_struct, so locking
376 * sighand_struct is always a proper superset of
377 * the locking of signal_struct.
379 struct signal_struct {
383 wait_queue_head_t wait_chldexit; /* for wait4() */
385 /* current thread group signal load-balancing target: */
386 struct task_struct *curr_target;
388 /* shared signal handling: */
389 struct sigpending shared_pending;
391 /* thread group exit support */
394 * - notify group_exit_task when ->count is equal to notify_count
395 * - everyone except group_exit_task is stopped during signal delivery
396 * of fatal signals, group_exit_task processes the signal.
398 struct task_struct *group_exit_task;
401 /* thread group stop support, overloads group_exit_code too */
402 int group_stop_count;
403 unsigned int flags; /* see SIGNAL_* flags below */
405 /* POSIX.1b Interval Timers */
406 struct list_head posix_timers;
408 /* ITIMER_REAL timer for the process */
409 struct hrtimer real_timer;
410 struct task_struct *tsk;
411 ktime_t it_real_incr;
413 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
414 cputime_t it_prof_expires, it_virt_expires;
415 cputime_t it_prof_incr, it_virt_incr;
417 /* job control IDs */
421 /* boolean value for session group leader */
424 struct tty_struct *tty; /* NULL if no tty */
427 * Cumulative resource counters for dead threads in the group,
428 * and for reaped dead child processes forked by this group.
429 * Live threads maintain their own counters and add to these
430 * in __exit_signal, except for the group leader.
432 cputime_t utime, stime, cutime, cstime;
433 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
434 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
437 * Cumulative ns of scheduled CPU time for dead threads in the
438 * group, not including a zombie group leader. (This only differs
439 * from jiffies_to_ns(utime + stime) if sched_clock uses something
440 * other than jiffies.)
442 unsigned long long sched_time;
445 * We don't bother to synchronize most readers of this at all,
446 * because there is no reader checking a limit that actually needs
447 * to get both rlim_cur and rlim_max atomically, and either one
448 * alone is a single word that can safely be read normally.
449 * getrlimit/setrlimit use task_lock(current->group_leader) to
450 * protect this instead of the siglock, because they really
451 * have no need to disable irqs.
453 struct rlimit rlim[RLIM_NLIMITS];
455 struct list_head cpu_timers[3];
457 /* keep the process-shared keyrings here so that they do the right
458 * thing in threads created with CLONE_THREAD */
460 struct key *session_keyring; /* keyring inherited over fork */
461 struct key *process_keyring; /* keyring private to this process */
463 #ifdef CONFIG_BSD_PROCESS_ACCT
464 struct pacct_struct pacct; /* per-process accounting information */
468 /* Context switch must be unlocked if interrupts are to be enabled */
469 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
470 # define __ARCH_WANT_UNLOCKED_CTXSW
474 * Bits in flags field of signal_struct.
476 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
477 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
478 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
479 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
483 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
484 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
485 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
486 * values are inverted: lower p->prio value means higher priority.
488 * The MAX_USER_RT_PRIO value allows the actual maximum
489 * RT priority to be separate from the value exported to
490 * user-space. This allows kernel threads to set their
491 * priority to a value higher than any user task. Note:
492 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
495 #define MAX_USER_RT_PRIO 100
496 #define MAX_RT_PRIO MAX_USER_RT_PRIO
498 #define MAX_PRIO (MAX_RT_PRIO + 40)
500 #define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO)
501 #define rt_task(p) rt_prio((p)->prio)
502 #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH))
503 #define has_rt_policy(p) \
504 unlikely((p)->policy != SCHED_NORMAL && (p)->policy != SCHED_BATCH)
507 * Some day this will be a full-fledged user tracking system..
510 atomic_t __count; /* reference count */
511 atomic_t processes; /* How many processes does this user have? */
512 atomic_t files; /* How many open files does this user have? */
513 atomic_t sigpending; /* How many pending signals does this user have? */
514 #ifdef CONFIG_INOTIFY_USER
515 atomic_t inotify_watches; /* How many inotify watches does this user have? */
516 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
518 /* protected by mq_lock */
519 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
520 unsigned long locked_shm; /* How many pages of mlocked shm ? */
523 struct key *uid_keyring; /* UID specific keyring */
524 struct key *session_keyring; /* UID's default session keyring */
527 /* Hash table maintenance information */
528 struct list_head uidhash_list;
532 extern struct user_struct *find_user(uid_t);
534 extern struct user_struct root_user;
535 #define INIT_USER (&root_user)
537 struct backing_dev_info;
538 struct reclaim_state;
540 #ifdef CONFIG_SCHEDSTATS
542 /* cumulative counters */
543 unsigned long cpu_time, /* time spent on the cpu */
544 run_delay, /* time spent waiting on a runqueue */
545 pcnt; /* # of timeslices run on this cpu */
548 unsigned long last_arrival, /* when we last ran on a cpu */
549 last_queued; /* when we were last queued to run */
552 extern struct file_operations proc_schedstat_operations;
555 #ifdef CONFIG_TASK_DELAY_ACCT
556 struct task_delay_info {
558 unsigned int flags; /* Private per-task flags */
560 /* For each stat XXX, add following, aligned appropriately
562 * struct timespec XXX_start, XXX_end;
566 * Atomicity of updates to XXX_delay, XXX_count protected by
567 * single lock above (split into XXX_lock if contention is an issue).
571 * XXX_count is incremented on every XXX operation, the delay
572 * associated with the operation is added to XXX_delay.
573 * XXX_delay contains the accumulated delay time in nanoseconds.
575 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
576 u64 blkio_delay; /* wait for sync block io completion */
577 u64 swapin_delay; /* wait for swapin block io completion */
578 u32 blkio_count; /* total count of the number of sync block */
579 /* io operations performed */
580 u32 swapin_count; /* total count of the number of swapin block */
581 /* io operations performed */
594 * sched-domains (multiprocessor balancing) declarations:
596 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
599 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
600 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
601 #define SD_BALANCE_EXEC 4 /* Balance on exec */
602 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
603 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
604 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
605 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
606 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
607 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
609 #define BALANCE_FOR_POWER ((sched_mc_power_savings || sched_smt_power_savings) \
610 ? SD_POWERSAVINGS_BALANCE : 0)
614 struct sched_group *next; /* Must be a circular list */
618 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
619 * single CPU. This is read only (except for setup, hotplug CPU).
621 unsigned long cpu_power;
624 struct sched_domain {
625 /* These fields must be setup */
626 struct sched_domain *parent; /* top domain must be null terminated */
627 struct sched_group *groups; /* the balancing groups of the domain */
628 cpumask_t span; /* span of all CPUs in this domain */
629 unsigned long min_interval; /* Minimum balance interval ms */
630 unsigned long max_interval; /* Maximum balance interval ms */
631 unsigned int busy_factor; /* less balancing by factor if busy */
632 unsigned int imbalance_pct; /* No balance until over watermark */
633 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
634 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
635 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
636 unsigned int busy_idx;
637 unsigned int idle_idx;
638 unsigned int newidle_idx;
639 unsigned int wake_idx;
640 unsigned int forkexec_idx;
641 int flags; /* See SD_* */
643 /* Runtime fields. */
644 unsigned long last_balance; /* init to jiffies. units in jiffies */
645 unsigned int balance_interval; /* initialise to 1. units in ms. */
646 unsigned int nr_balance_failed; /* initialise to 0 */
648 #ifdef CONFIG_SCHEDSTATS
649 /* load_balance() stats */
650 unsigned long lb_cnt[MAX_IDLE_TYPES];
651 unsigned long lb_failed[MAX_IDLE_TYPES];
652 unsigned long lb_balanced[MAX_IDLE_TYPES];
653 unsigned long lb_imbalance[MAX_IDLE_TYPES];
654 unsigned long lb_gained[MAX_IDLE_TYPES];
655 unsigned long lb_hot_gained[MAX_IDLE_TYPES];
656 unsigned long lb_nobusyg[MAX_IDLE_TYPES];
657 unsigned long lb_nobusyq[MAX_IDLE_TYPES];
659 /* Active load balancing */
660 unsigned long alb_cnt;
661 unsigned long alb_failed;
662 unsigned long alb_pushed;
664 /* SD_BALANCE_EXEC stats */
665 unsigned long sbe_cnt;
666 unsigned long sbe_balanced;
667 unsigned long sbe_pushed;
669 /* SD_BALANCE_FORK stats */
670 unsigned long sbf_cnt;
671 unsigned long sbf_balanced;
672 unsigned long sbf_pushed;
674 /* try_to_wake_up() stats */
675 unsigned long ttwu_wake_remote;
676 unsigned long ttwu_move_affine;
677 unsigned long ttwu_move_balance;
681 extern int partition_sched_domains(cpumask_t *partition1,
682 cpumask_t *partition2);
685 * Maximum cache size the migration-costs auto-tuning code will
688 extern unsigned int max_cache_size;
690 #endif /* CONFIG_SMP */
693 struct io_context; /* See blkdev.h */
694 void exit_io_context(void);
697 #define NGROUPS_SMALL 32
698 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
702 gid_t small_block[NGROUPS_SMALL];
708 * get_group_info() must be called with the owning task locked (via task_lock())
709 * when task != current. The reason being that the vast majority of callers are
710 * looking at current->group_info, which can not be changed except by the
711 * current task. Changing current->group_info requires the task lock, too.
713 #define get_group_info(group_info) do { \
714 atomic_inc(&(group_info)->usage); \
717 #define put_group_info(group_info) do { \
718 if (atomic_dec_and_test(&(group_info)->usage)) \
719 groups_free(group_info); \
722 extern struct group_info *groups_alloc(int gidsetsize);
723 extern void groups_free(struct group_info *group_info);
724 extern int set_current_groups(struct group_info *group_info);
725 extern int groups_search(struct group_info *group_info, gid_t grp);
726 /* access the groups "array" with this macro */
727 #define GROUP_AT(gi, i) \
728 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
730 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
731 extern void prefetch_stack(struct task_struct *t);
733 static inline void prefetch_stack(struct task_struct *t) { }
736 struct audit_context; /* See audit.c */
738 struct pipe_inode_info;
742 SLEEP_NONINTERACTIVE,
750 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
751 struct thread_info *thread_info;
753 unsigned long flags; /* per process flags, defined below */
754 unsigned long ptrace;
756 int lock_depth; /* BKL lock depth */
759 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
763 int load_weight; /* for niceness load balancing purposes */
764 int prio, static_prio, normal_prio;
765 struct list_head run_list;
766 struct prio_array *array;
768 unsigned short ioprio;
769 unsigned int btrace_seq;
771 unsigned long sleep_avg;
772 unsigned long long timestamp, last_ran;
773 unsigned long long sched_time; /* sched_clock time spent running */
774 enum sleep_type sleep_type;
776 unsigned long policy;
777 cpumask_t cpus_allowed;
778 unsigned int time_slice, first_time_slice;
780 #ifdef CONFIG_SCHEDSTATS
781 struct sched_info sched_info;
784 struct list_head tasks;
786 * ptrace_list/ptrace_children forms the list of my children
787 * that were stolen by a ptracer.
789 struct list_head ptrace_children;
790 struct list_head ptrace_list;
792 struct mm_struct *mm, *active_mm;
795 struct linux_binfmt *binfmt;
797 int exit_code, exit_signal;
798 int pdeath_signal; /* The signal sent when the parent dies */
800 unsigned long personality;
805 * pointers to (original) parent process, youngest child, younger sibling,
806 * older sibling, respectively. (p->father can be replaced with
809 struct task_struct *real_parent; /* real parent process (when being debugged) */
810 struct task_struct *parent; /* parent process */
812 * children/sibling forms the list of my children plus the
813 * tasks I'm ptracing.
815 struct list_head children; /* list of my children */
816 struct list_head sibling; /* linkage in my parent's children list */
817 struct task_struct *group_leader; /* threadgroup leader */
819 /* PID/PID hash table linkage. */
820 struct pid_link pids[PIDTYPE_MAX];
821 struct list_head thread_group;
823 struct completion *vfork_done; /* for vfork() */
824 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
825 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
827 unsigned long rt_priority;
828 cputime_t utime, stime;
829 unsigned long nvcsw, nivcsw; /* context switch counts */
830 struct timespec start_time;
831 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
832 unsigned long min_flt, maj_flt;
834 cputime_t it_prof_expires, it_virt_expires;
835 unsigned long long it_sched_expires;
836 struct list_head cpu_timers[3];
838 /* process credentials */
839 uid_t uid,euid,suid,fsuid;
840 gid_t gid,egid,sgid,fsgid;
841 struct group_info *group_info;
842 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
843 unsigned keep_capabilities:1;
844 struct user_struct *user;
846 struct key *request_key_auth; /* assumed request_key authority */
847 struct key *thread_keyring; /* keyring private to this thread */
848 unsigned char jit_keyring; /* default keyring to attach requested keys to */
850 int oomkilladj; /* OOM kill score adjustment (bit shift). */
851 char comm[TASK_COMM_LEN]; /* executable name excluding path
852 - access with [gs]et_task_comm (which lock
854 - initialized normally by flush_old_exec */
855 /* file system info */
856 int link_count, total_link_count;
858 struct sysv_sem sysvsem;
859 /* CPU-specific state of this task */
860 struct thread_struct thread;
861 /* filesystem information */
862 struct fs_struct *fs;
863 /* open file information */
864 struct files_struct *files;
866 struct namespace *namespace;
867 /* signal handlers */
868 struct signal_struct *signal;
869 struct sighand_struct *sighand;
871 sigset_t blocked, real_blocked;
872 sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */
873 struct sigpending pending;
875 unsigned long sas_ss_sp;
877 int (*notifier)(void *priv);
879 sigset_t *notifier_mask;
882 struct audit_context *audit_context;
885 /* Thread group tracking */
888 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
889 spinlock_t alloc_lock;
891 /* Protection of the PI data structures: */
894 #ifdef CONFIG_RT_MUTEXES
895 /* PI waiters blocked on a rt_mutex held by this task */
896 struct plist_head pi_waiters;
897 /* Deadlock detection and priority inheritance handling */
898 struct rt_mutex_waiter *pi_blocked_on;
901 #ifdef CONFIG_DEBUG_MUTEXES
902 /* mutex deadlock detection */
903 struct mutex_waiter *blocked_on;
905 #ifdef CONFIG_TRACE_IRQFLAGS
906 unsigned int irq_events;
907 int hardirqs_enabled;
908 unsigned long hardirq_enable_ip;
909 unsigned int hardirq_enable_event;
910 unsigned long hardirq_disable_ip;
911 unsigned int hardirq_disable_event;
912 int softirqs_enabled;
913 unsigned long softirq_disable_ip;
914 unsigned int softirq_disable_event;
915 unsigned long softirq_enable_ip;
916 unsigned int softirq_enable_event;
920 #ifdef CONFIG_LOCKDEP
921 # define MAX_LOCK_DEPTH 30UL
924 struct held_lock held_locks[MAX_LOCK_DEPTH];
925 unsigned int lockdep_recursion;
928 /* journalling filesystem info */
932 struct reclaim_state *reclaim_state;
934 struct backing_dev_info *backing_dev_info;
936 struct io_context *io_context;
938 unsigned long ptrace_message;
939 siginfo_t *last_siginfo; /* For ptrace use. */
941 * current io wait handle: wait queue entry to use for io waits
942 * If this thread is processing aio, this points at the waitqueue
943 * inside the currently handled kiocb. It may be NULL (i.e. default
944 * to a stack based synchronous wait) if its doing sync IO.
946 wait_queue_t *io_wait;
947 /* i/o counters(bytes read/written, #syscalls */
948 u64 rchar, wchar, syscr, syscw;
949 #if defined(CONFIG_BSD_PROCESS_ACCT)
950 u64 acct_rss_mem1; /* accumulated rss usage */
951 u64 acct_vm_mem1; /* accumulated virtual memory usage */
952 clock_t acct_stimexpd; /* clock_t-converted stime since last update */
955 struct mempolicy *mempolicy;
958 #ifdef CONFIG_CPUSETS
959 struct cpuset *cpuset;
960 nodemask_t mems_allowed;
961 int cpuset_mems_generation;
962 int cpuset_mem_spread_rotor;
964 struct robust_list_head __user *robust_list;
966 struct compat_robust_list_head __user *compat_robust_list;
968 struct list_head pi_state_list;
969 struct futex_pi_state *pi_state_cache;
971 atomic_t fs_excl; /* holding fs exclusive resources */
975 * cache last used pipe for splice
977 struct pipe_inode_info *splice_pipe;
978 #ifdef CONFIG_TASK_DELAY_ACCT
979 struct task_delay_info *delays;
983 static inline pid_t process_group(struct task_struct *tsk)
985 return tsk->signal->pgrp;
989 * pid_alive - check that a task structure is not stale
990 * @p: Task structure to be checked.
992 * Test if a process is not yet dead (at most zombie state)
993 * If pid_alive fails, then pointers within the task structure
994 * can be stale and must not be dereferenced.
996 static inline int pid_alive(struct task_struct *p)
998 return p->pids[PIDTYPE_PID].pid != NULL;
1001 extern void free_task(struct task_struct *tsk);
1002 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1004 extern void __put_task_struct(struct task_struct *t);
1006 static inline void put_task_struct(struct task_struct *t)
1008 if (atomic_dec_and_test(&t->usage))
1009 __put_task_struct(t);
1015 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1016 /* Not implemented yet, only for 486*/
1017 #define PF_STARTING 0x00000002 /* being created */
1018 #define PF_EXITING 0x00000004 /* getting shut down */
1019 #define PF_DEAD 0x00000008 /* Dead */
1020 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1021 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1022 #define PF_DUMPCORE 0x00000200 /* dumped core */
1023 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1024 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1025 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1026 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1027 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
1028 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1029 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1030 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1031 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1032 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1033 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1034 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1035 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1036 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1037 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1038 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1039 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1040 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1043 * Only the _current_ task can read/write to tsk->flags, but other
1044 * tasks can access tsk->flags in readonly mode for example
1045 * with tsk_used_math (like during threaded core dumping).
1046 * There is however an exception to this rule during ptrace
1047 * or during fork: the ptracer task is allowed to write to the
1048 * child->flags of its traced child (same goes for fork, the parent
1049 * can write to the child->flags), because we're guaranteed the
1050 * child is not running and in turn not changing child->flags
1051 * at the same time the parent does it.
1053 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1054 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1055 #define clear_used_math() clear_stopped_child_used_math(current)
1056 #define set_used_math() set_stopped_child_used_math(current)
1057 #define conditional_stopped_child_used_math(condition, child) \
1058 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1059 #define conditional_used_math(condition) \
1060 conditional_stopped_child_used_math(condition, current)
1061 #define copy_to_stopped_child_used_math(child) \
1062 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1063 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1064 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1065 #define used_math() tsk_used_math(current)
1068 extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask);
1070 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1072 if (!cpu_isset(0, new_mask))
1078 extern unsigned long long sched_clock(void);
1079 extern unsigned long long
1080 current_sched_time(const struct task_struct *current_task);
1082 /* sched_exec is called by processes performing an exec */
1084 extern void sched_exec(void);
1086 #define sched_exec() {}
1089 #ifdef CONFIG_HOTPLUG_CPU
1090 extern void idle_task_exit(void);
1092 static inline void idle_task_exit(void) {}
1095 extern void sched_idle_next(void);
1097 #ifdef CONFIG_RT_MUTEXES
1098 extern int rt_mutex_getprio(struct task_struct *p);
1099 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1100 extern void rt_mutex_adjust_pi(struct task_struct *p);
1102 static inline int rt_mutex_getprio(struct task_struct *p)
1104 return p->normal_prio;
1106 # define rt_mutex_adjust_pi(p) do { } while (0)
1109 extern void set_user_nice(struct task_struct *p, long nice);
1110 extern int task_prio(const struct task_struct *p);
1111 extern int task_nice(const struct task_struct *p);
1112 extern int can_nice(const struct task_struct *p, const int nice);
1113 extern int task_curr(const struct task_struct *p);
1114 extern int idle_cpu(int cpu);
1115 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1116 extern struct task_struct *idle_task(int cpu);
1117 extern struct task_struct *curr_task(int cpu);
1118 extern void set_curr_task(int cpu, struct task_struct *p);
1123 * The default (Linux) execution domain.
1125 extern struct exec_domain default_exec_domain;
1127 union thread_union {
1128 struct thread_info thread_info;
1129 unsigned long stack[THREAD_SIZE/sizeof(long)];
1132 #ifndef __HAVE_ARCH_KSTACK_END
1133 static inline int kstack_end(void *addr)
1135 /* Reliable end of stack detection:
1136 * Some APM bios versions misalign the stack
1138 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1142 extern union thread_union init_thread_union;
1143 extern struct task_struct init_task;
1145 extern struct mm_struct init_mm;
1147 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1148 extern struct task_struct *find_task_by_pid_type(int type, int pid);
1149 extern void set_special_pids(pid_t session, pid_t pgrp);
1150 extern void __set_special_pids(pid_t session, pid_t pgrp);
1152 /* per-UID process charging. */
1153 extern struct user_struct * alloc_uid(uid_t);
1154 static inline struct user_struct *get_uid(struct user_struct *u)
1156 atomic_inc(&u->__count);
1159 extern void free_uid(struct user_struct *);
1160 extern void switch_uid(struct user_struct *);
1162 #include <asm/current.h>
1164 extern void do_timer(struct pt_regs *);
1166 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
1167 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
1168 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
1169 unsigned long clone_flags));
1171 extern void kick_process(struct task_struct *tsk);
1173 static inline void kick_process(struct task_struct *tsk) { }
1175 extern void FASTCALL(sched_fork(struct task_struct * p, int clone_flags));
1176 extern void FASTCALL(sched_exit(struct task_struct * p));
1178 extern int in_group_p(gid_t);
1179 extern int in_egroup_p(gid_t);
1181 extern void proc_caches_init(void);
1182 extern void flush_signals(struct task_struct *);
1183 extern void flush_signal_handlers(struct task_struct *, int force_default);
1184 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1186 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1188 unsigned long flags;
1191 spin_lock_irqsave(&tsk->sighand->siglock, flags);
1192 ret = dequeue_signal(tsk, mask, info);
1193 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1198 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1200 extern void unblock_all_signals(void);
1201 extern void release_task(struct task_struct * p);
1202 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1203 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
1204 extern int force_sigsegv(int, struct task_struct *);
1205 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1206 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
1207 extern int kill_pg_info(int, struct siginfo *, pid_t);
1208 extern int kill_proc_info(int, struct siginfo *, pid_t);
1209 extern int kill_proc_info_as_uid(int, struct siginfo *, pid_t, uid_t, uid_t, u32);
1210 extern void do_notify_parent(struct task_struct *, int);
1211 extern void force_sig(int, struct task_struct *);
1212 extern void force_sig_specific(int, struct task_struct *);
1213 extern int send_sig(int, struct task_struct *, int);
1214 extern void zap_other_threads(struct task_struct *p);
1215 extern int kill_pg(pid_t, int, int);
1216 extern int kill_proc(pid_t, int, int);
1217 extern struct sigqueue *sigqueue_alloc(void);
1218 extern void sigqueue_free(struct sigqueue *);
1219 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
1220 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
1221 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1222 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1224 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1225 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1226 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1227 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1229 static inline int is_si_special(const struct siginfo *info)
1231 return info <= SEND_SIG_FORCED;
1234 /* True if we are on the alternate signal stack. */
1236 static inline int on_sig_stack(unsigned long sp)
1238 return (sp - current->sas_ss_sp < current->sas_ss_size);
1241 static inline int sas_ss_flags(unsigned long sp)
1243 return (current->sas_ss_size == 0 ? SS_DISABLE
1244 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1248 * Routines for handling mm_structs
1250 extern struct mm_struct * mm_alloc(void);
1252 /* mmdrop drops the mm and the page tables */
1253 extern void FASTCALL(__mmdrop(struct mm_struct *));
1254 static inline void mmdrop(struct mm_struct * mm)
1256 if (atomic_dec_and_test(&mm->mm_count))
1260 /* mmput gets rid of the mappings and all user-space */
1261 extern void mmput(struct mm_struct *);
1262 /* Grab a reference to a task's mm, if it is not already going away */
1263 extern struct mm_struct *get_task_mm(struct task_struct *task);
1264 /* Remove the current tasks stale references to the old mm_struct */
1265 extern void mm_release(struct task_struct *, struct mm_struct *);
1267 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1268 extern void flush_thread(void);
1269 extern void exit_thread(void);
1271 extern void exit_files(struct task_struct *);
1272 extern void __cleanup_signal(struct signal_struct *);
1273 extern void __cleanup_sighand(struct sighand_struct *);
1274 extern void exit_itimers(struct signal_struct *);
1276 extern NORET_TYPE void do_group_exit(int);
1278 extern void daemonize(const char *, ...);
1279 extern int allow_signal(int);
1280 extern int disallow_signal(int);
1281 extern struct task_struct *child_reaper;
1283 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1284 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1285 struct task_struct *fork_idle(int);
1287 extern void set_task_comm(struct task_struct *tsk, char *from);
1288 extern void get_task_comm(char *to, struct task_struct *tsk);
1291 extern void wait_task_inactive(struct task_struct * p);
1293 #define wait_task_inactive(p) do { } while (0)
1296 #define remove_parent(p) list_del_init(&(p)->sibling)
1297 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1299 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1301 #define for_each_process(p) \
1302 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1305 * Careful: do_each_thread/while_each_thread is a double loop so
1306 * 'break' will not work as expected - use goto instead.
1308 #define do_each_thread(g, t) \
1309 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1311 #define while_each_thread(g, t) \
1312 while ((t = next_thread(t)) != g)
1314 /* de_thread depends on thread_group_leader not being a pid based check */
1315 #define thread_group_leader(p) (p == p->group_leader)
1317 static inline struct task_struct *next_thread(const struct task_struct *p)
1319 return list_entry(rcu_dereference(p->thread_group.next),
1320 struct task_struct, thread_group);
1323 static inline int thread_group_empty(struct task_struct *p)
1325 return list_empty(&p->thread_group);
1328 #define delay_group_leader(p) \
1329 (thread_group_leader(p) && !thread_group_empty(p))
1332 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1333 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1334 * pins the final release of task.io_context. Also protects ->cpuset.
1336 * Nests both inside and outside of read_lock(&tasklist_lock).
1337 * It must not be nested with write_lock_irq(&tasklist_lock),
1338 * neither inside nor outside.
1340 static inline void task_lock(struct task_struct *p)
1342 spin_lock(&p->alloc_lock);
1345 static inline void task_unlock(struct task_struct *p)
1347 spin_unlock(&p->alloc_lock);
1350 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1351 unsigned long *flags);
1353 static inline void unlock_task_sighand(struct task_struct *tsk,
1354 unsigned long *flags)
1356 spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1359 #ifndef __HAVE_THREAD_FUNCTIONS
1361 #define task_thread_info(task) (task)->thread_info
1362 #define task_stack_page(task) ((void*)((task)->thread_info))
1364 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1366 *task_thread_info(p) = *task_thread_info(org);
1367 task_thread_info(p)->task = p;
1370 static inline unsigned long *end_of_stack(struct task_struct *p)
1372 return (unsigned long *)(p->thread_info + 1);
1377 /* set thread flags in other task's structures
1378 * - see asm/thread_info.h for TIF_xxxx flags available
1380 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1382 set_ti_thread_flag(task_thread_info(tsk), flag);
1385 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1387 clear_ti_thread_flag(task_thread_info(tsk), flag);
1390 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1392 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1395 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1397 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1400 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1402 return test_ti_thread_flag(task_thread_info(tsk), flag);
1405 static inline void set_tsk_need_resched(struct task_struct *tsk)
1407 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1410 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1412 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1415 static inline int signal_pending(struct task_struct *p)
1417 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1420 static inline int need_resched(void)
1422 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1426 * cond_resched() and cond_resched_lock(): latency reduction via
1427 * explicit rescheduling in places that are safe. The return
1428 * value indicates whether a reschedule was done in fact.
1429 * cond_resched_lock() will drop the spinlock before scheduling,
1430 * cond_resched_softirq() will enable bhs before scheduling.
1432 extern int cond_resched(void);
1433 extern int cond_resched_lock(spinlock_t * lock);
1434 extern int cond_resched_softirq(void);
1437 * Does a critical section need to be broken due to another
1440 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1441 # define need_lockbreak(lock) ((lock)->break_lock)
1443 # define need_lockbreak(lock) 0
1447 * Does a critical section need to be broken due to another
1448 * task waiting or preemption being signalled:
1450 static inline int lock_need_resched(spinlock_t *lock)
1452 if (need_lockbreak(lock) || need_resched())
1457 /* Reevaluate whether the task has signals pending delivery.
1458 This is required every time the blocked sigset_t changes.
1459 callers must hold sighand->siglock. */
1461 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
1462 extern void recalc_sigpending(void);
1464 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1467 * Wrappers for p->thread_info->cpu access. No-op on UP.
1471 static inline unsigned int task_cpu(const struct task_struct *p)
1473 return task_thread_info(p)->cpu;
1476 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1478 task_thread_info(p)->cpu = cpu;
1483 static inline unsigned int task_cpu(const struct task_struct *p)
1488 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1492 #endif /* CONFIG_SMP */
1494 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1495 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1497 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1499 mm->mmap_base = TASK_UNMAPPED_BASE;
1500 mm->get_unmapped_area = arch_get_unmapped_area;
1501 mm->unmap_area = arch_unmap_area;
1505 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1506 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1508 #include <linux/sysdev.h>
1509 extern int sched_mc_power_savings, sched_smt_power_savings;
1510 extern struct sysdev_attribute attr_sched_mc_power_savings, attr_sched_smt_power_savings;
1511 extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
1513 extern void normalize_rt_tasks(void);
1517 * Check if a process has been frozen
1519 static inline int frozen(struct task_struct *p)
1521 return p->flags & PF_FROZEN;
1525 * Check if there is a request to freeze a process
1527 static inline int freezing(struct task_struct *p)
1529 return p->flags & PF_FREEZE;
1533 * Request that a process be frozen
1534 * FIXME: SMP problem. We may not modify other process' flags!
1536 static inline void freeze(struct task_struct *p)
1538 p->flags |= PF_FREEZE;
1542 * Wake up a frozen process
1544 static inline int thaw_process(struct task_struct *p)
1547 p->flags &= ~PF_FROZEN;
1555 * freezing is complete, mark process as frozen
1557 static inline void frozen_process(struct task_struct *p)
1559 p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN;
1562 extern void refrigerator(void);
1563 extern int freeze_processes(void);
1564 extern void thaw_processes(void);
1566 static inline int try_to_freeze(void)
1568 if (freezing(current)) {
1575 static inline int frozen(struct task_struct *p) { return 0; }
1576 static inline int freezing(struct task_struct *p) { return 0; }
1577 static inline void freeze(struct task_struct *p) { BUG(); }
1578 static inline int thaw_process(struct task_struct *p) { return 1; }
1579 static inline void frozen_process(struct task_struct *p) { BUG(); }
1581 static inline void refrigerator(void) {}
1582 static inline int freeze_processes(void) { BUG(); return 0; }
1583 static inline void thaw_processes(void) {}
1585 static inline int try_to_freeze(void) { return 0; }
1587 #endif /* CONFIG_PM */
1588 #endif /* __KERNEL__ */