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 */
27 #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
28 #define CLONE_NEWIPC 0x08000000 /* New ipcs */
33 #define SCHED_NORMAL 0
37 /* SCHED_ISO: reserved but not implemented yet */
46 #include <asm/param.h> /* for HZ */
48 #include <linux/capability.h>
49 #include <linux/threads.h>
50 #include <linux/kernel.h>
51 #include <linux/types.h>
52 #include <linux/timex.h>
53 #include <linux/jiffies.h>
54 #include <linux/rbtree.h>
55 #include <linux/thread_info.h>
56 #include <linux/cpumask.h>
57 #include <linux/errno.h>
58 #include <linux/nodemask.h>
60 #include <asm/system.h>
61 #include <asm/semaphore.h>
63 #include <asm/ptrace.h>
65 #include <asm/cputime.h>
67 #include <linux/smp.h>
68 #include <linux/sem.h>
69 #include <linux/signal.h>
70 #include <linux/securebits.h>
71 #include <linux/fs_struct.h>
72 #include <linux/compiler.h>
73 #include <linux/completion.h>
74 #include <linux/pid.h>
75 #include <linux/percpu.h>
76 #include <linux/topology.h>
77 #include <linux/seccomp.h>
78 #include <linux/rcupdate.h>
79 #include <linux/futex.h>
80 #include <linux/rtmutex.h>
82 #include <linux/time.h>
83 #include <linux/param.h>
84 #include <linux/resource.h>
85 #include <linux/timer.h>
86 #include <linux/hrtimer.h>
87 #include <linux/task_io_accounting.h>
89 #include <asm/processor.h>
92 struct futex_pi_state
;
96 * List of flags we want to share for kernel threads,
97 * if only because they are not used by them anyway.
99 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
102 * These are the constant used to fake the fixed-point load-average
103 * counting. Some notes:
104 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
105 * a load-average precision of 10 bits integer + 11 bits fractional
106 * - if you want to count load-averages more often, you need more
107 * precision, or rounding will get you. With 2-second counting freq,
108 * the EXP_n values would be 1981, 2034 and 2043 if still using only
111 extern unsigned long avenrun
[]; /* Load averages */
113 #define FSHIFT 11 /* nr of bits of precision */
114 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
115 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
116 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
117 #define EXP_5 2014 /* 1/exp(5sec/5min) */
118 #define EXP_15 2037 /* 1/exp(5sec/15min) */
120 #define CALC_LOAD(load,exp,n) \
122 load += n*(FIXED_1-exp); \
125 extern unsigned long total_forks
;
126 extern int nr_threads
;
127 DECLARE_PER_CPU(unsigned long, process_counts
);
128 extern int nr_processes(void);
129 extern unsigned long nr_running(void);
130 extern unsigned long nr_uninterruptible(void);
131 extern unsigned long nr_active(void);
132 extern unsigned long nr_iowait(void);
133 extern unsigned long weighted_cpuload(const int cpu
);
137 * Task state bitmask. NOTE! These bits are also
138 * encoded in fs/proc/array.c: get_task_state().
140 * We have two separate sets of flags: task->state
141 * is about runnability, while task->exit_state are
142 * about the task exiting. Confusing, but this way
143 * modifying one set can't modify the other one by
146 #define TASK_RUNNING 0
147 #define TASK_INTERRUPTIBLE 1
148 #define TASK_UNINTERRUPTIBLE 2
149 #define TASK_STOPPED 4
150 #define TASK_TRACED 8
151 /* in tsk->exit_state */
152 #define EXIT_ZOMBIE 16
154 /* in tsk->state again */
155 #define TASK_NONINTERACTIVE 64
156 #define TASK_DEAD 128
158 #define __set_task_state(tsk, state_value) \
159 do { (tsk)->state = (state_value); } while (0)
160 #define set_task_state(tsk, state_value) \
161 set_mb((tsk)->state, (state_value))
164 * set_current_state() includes a barrier so that the write of current->state
165 * is correctly serialised wrt the caller's subsequent test of whether to
168 * set_current_state(TASK_UNINTERRUPTIBLE);
169 * if (do_i_need_to_sleep())
172 * If the caller does not need such serialisation then use __set_current_state()
174 #define __set_current_state(state_value) \
175 do { current->state = (state_value); } while (0)
176 #define set_current_state(state_value) \
177 set_mb(current->state, (state_value))
179 /* Task command name length */
180 #define TASK_COMM_LEN 16
182 #include <linux/spinlock.h>
185 * This serializes "schedule()" and also protects
186 * the run-queue from deletions/modifications (but
187 * _adding_ to the beginning of the run-queue has
190 extern rwlock_t tasklist_lock
;
191 extern spinlock_t mmlist_lock
;
195 extern void sched_init(void);
196 extern void sched_init_smp(void);
197 extern void init_idle(struct task_struct
*idle
, int cpu
);
199 extern cpumask_t nohz_cpu_mask
;
200 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
201 extern int select_nohz_load_balancer(int cpu
);
203 static inline int select_nohz_load_balancer(int cpu
)
210 * Only dump TASK_* tasks. (0 for all tasks)
212 extern void show_state_filter(unsigned long state_filter
);
214 static inline void show_state(void)
216 show_state_filter(0);
219 extern void show_regs(struct pt_regs
*);
222 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
223 * task), SP is the stack pointer of the first frame that should be shown in the back
224 * trace (or NULL if the entire call-chain of the task should be shown).
226 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
228 void io_schedule(void);
229 long io_schedule_timeout(long timeout
);
231 extern void cpu_init (void);
232 extern void trap_init(void);
233 extern void update_process_times(int user
);
234 extern void scheduler_tick(void);
236 #ifdef CONFIG_DETECT_SOFTLOCKUP
237 extern void softlockup_tick(void);
238 extern void spawn_softlockup_task(void);
239 extern void touch_softlockup_watchdog(void);
240 extern void touch_all_softlockup_watchdogs(void);
242 static inline void softlockup_tick(void)
245 static inline void spawn_softlockup_task(void)
248 static inline void touch_softlockup_watchdog(void)
251 static inline void touch_all_softlockup_watchdogs(void)
257 /* Attach to any functions which should be ignored in wchan output. */
258 #define __sched __attribute__((__section__(".sched.text")))
259 /* Is this address in the __sched functions? */
260 extern int in_sched_functions(unsigned long addr
);
262 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
263 extern signed long FASTCALL(schedule_timeout(signed long timeout
));
264 extern signed long schedule_timeout_interruptible(signed long timeout
);
265 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
266 asmlinkage
void schedule(void);
270 /* Maximum number of active map areas.. This is a random (large) number */
271 #define DEFAULT_MAX_MAP_COUNT 65536
273 extern int sysctl_max_map_count
;
275 #include <linux/aio.h>
278 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
279 unsigned long, unsigned long);
281 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
282 unsigned long len
, unsigned long pgoff
,
283 unsigned long flags
);
284 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
285 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
287 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
289 * The mm counters are not protected by its page_table_lock,
290 * so must be incremented atomically.
292 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
293 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
294 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
295 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
296 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
297 typedef atomic_long_t mm_counter_t
;
299 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
301 * The mm counters are protected by its page_table_lock,
302 * so can be incremented directly.
304 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
305 #define get_mm_counter(mm, member) ((mm)->_##member)
306 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
307 #define inc_mm_counter(mm, member) (mm)->_##member++
308 #define dec_mm_counter(mm, member) (mm)->_##member--
309 typedef unsigned long mm_counter_t
;
311 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
313 #define get_mm_rss(mm) \
314 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
315 #define update_hiwater_rss(mm) do { \
316 unsigned long _rss = get_mm_rss(mm); \
317 if ((mm)->hiwater_rss < _rss) \
318 (mm)->hiwater_rss = _rss; \
320 #define update_hiwater_vm(mm) do { \
321 if ((mm)->hiwater_vm < (mm)->total_vm) \
322 (mm)->hiwater_vm = (mm)->total_vm; \
326 struct vm_area_struct
* mmap
; /* list of VMAs */
327 struct rb_root mm_rb
;
328 struct vm_area_struct
* mmap_cache
; /* last find_vma result */
329 unsigned long (*get_unmapped_area
) (struct file
*filp
,
330 unsigned long addr
, unsigned long len
,
331 unsigned long pgoff
, unsigned long flags
);
332 void (*unmap_area
) (struct mm_struct
*mm
, unsigned long addr
);
333 unsigned long mmap_base
; /* base of mmap area */
334 unsigned long task_size
; /* size of task vm space */
335 unsigned long cached_hole_size
; /* if non-zero, the largest hole below free_area_cache */
336 unsigned long free_area_cache
; /* first hole of size cached_hole_size or larger */
338 atomic_t mm_users
; /* How many users with user space? */
339 atomic_t mm_count
; /* How many references to "struct mm_struct" (users count as 1) */
340 int map_count
; /* number of VMAs */
341 struct rw_semaphore mmap_sem
;
342 spinlock_t page_table_lock
; /* Protects page tables and some counters */
344 struct list_head mmlist
; /* List of maybe swapped mm's. These are globally strung
345 * together off init_mm.mmlist, and are protected
349 /* Special counters, in some configurations protected by the
350 * page_table_lock, in other configurations by being atomic.
352 mm_counter_t _file_rss
;
353 mm_counter_t _anon_rss
;
355 unsigned long hiwater_rss
; /* High-watermark of RSS usage */
356 unsigned long hiwater_vm
; /* High-water virtual memory usage */
358 unsigned long total_vm
, locked_vm
, shared_vm
, exec_vm
;
359 unsigned long stack_vm
, reserved_vm
, def_flags
, nr_ptes
;
360 unsigned long start_code
, end_code
, start_data
, end_data
;
361 unsigned long start_brk
, brk
, start_stack
;
362 unsigned long arg_start
, arg_end
, env_start
, env_end
;
364 unsigned long saved_auxv
[AT_VECTOR_SIZE
]; /* for /proc/PID/auxv */
366 cpumask_t cpu_vm_mask
;
368 /* Architecture-specific MM context */
369 mm_context_t context
;
371 /* Swap token stuff */
373 * Last value of global fault stamp as seen by this process.
374 * In other words, this value gives an indication of how long
375 * it has been since this task got the token.
376 * Look at mm/thrash.c
378 unsigned int faultstamp
;
379 unsigned int token_priority
;
380 unsigned int last_interval
;
382 unsigned char dumpable
:2;
384 /* coredumping support */
386 struct completion
*core_startup_done
, core_done
;
389 rwlock_t ioctx_list_lock
;
390 struct kioctx
*ioctx_list
;
393 struct sighand_struct
{
395 struct k_sigaction action
[_NSIG
];
397 struct list_head signalfd_list
;
400 struct pacct_struct
{
403 unsigned long ac_mem
;
404 cputime_t ac_utime
, ac_stime
;
405 unsigned long ac_minflt
, ac_majflt
;
409 * NOTE! "signal_struct" does not have it's own
410 * locking, because a shared signal_struct always
411 * implies a shared sighand_struct, so locking
412 * sighand_struct is always a proper superset of
413 * the locking of signal_struct.
415 struct signal_struct
{
419 wait_queue_head_t wait_chldexit
; /* for wait4() */
421 /* current thread group signal load-balancing target: */
422 struct task_struct
*curr_target
;
424 /* shared signal handling: */
425 struct sigpending shared_pending
;
427 /* thread group exit support */
430 * - notify group_exit_task when ->count is equal to notify_count
431 * - everyone except group_exit_task is stopped during signal delivery
432 * of fatal signals, group_exit_task processes the signal.
434 struct task_struct
*group_exit_task
;
437 /* thread group stop support, overloads group_exit_code too */
438 int group_stop_count
;
439 unsigned int flags
; /* see SIGNAL_* flags below */
441 /* POSIX.1b Interval Timers */
442 struct list_head posix_timers
;
444 /* ITIMER_REAL timer for the process */
445 struct hrtimer real_timer
;
446 struct task_struct
*tsk
;
447 ktime_t it_real_incr
;
449 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
450 cputime_t it_prof_expires
, it_virt_expires
;
451 cputime_t it_prof_incr
, it_virt_incr
;
453 /* job control IDs */
455 struct pid
*tty_old_pgrp
;
458 pid_t session __deprecated
;
462 /* boolean value for session group leader */
465 struct tty_struct
*tty
; /* NULL if no tty */
468 * Cumulative resource counters for dead threads in the group,
469 * and for reaped dead child processes forked by this group.
470 * Live threads maintain their own counters and add to these
471 * in __exit_signal, except for the group leader.
473 cputime_t utime
, stime
, cutime
, cstime
;
474 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
475 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
476 unsigned long inblock
, oublock
, cinblock
, coublock
;
479 * Cumulative ns of scheduled CPU time for dead threads in the
480 * group, not including a zombie group leader. (This only differs
481 * from jiffies_to_ns(utime + stime) if sched_clock uses something
482 * other than jiffies.)
484 unsigned long long sched_time
;
487 * We don't bother to synchronize most readers of this at all,
488 * because there is no reader checking a limit that actually needs
489 * to get both rlim_cur and rlim_max atomically, and either one
490 * alone is a single word that can safely be read normally.
491 * getrlimit/setrlimit use task_lock(current->group_leader) to
492 * protect this instead of the siglock, because they really
493 * have no need to disable irqs.
495 struct rlimit rlim
[RLIM_NLIMITS
];
497 struct list_head cpu_timers
[3];
499 /* keep the process-shared keyrings here so that they do the right
500 * thing in threads created with CLONE_THREAD */
502 struct key
*session_keyring
; /* keyring inherited over fork */
503 struct key
*process_keyring
; /* keyring private to this process */
505 #ifdef CONFIG_BSD_PROCESS_ACCT
506 struct pacct_struct pacct
; /* per-process accounting information */
508 #ifdef CONFIG_TASKSTATS
509 struct taskstats
*stats
;
513 /* Context switch must be unlocked if interrupts are to be enabled */
514 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
515 # define __ARCH_WANT_UNLOCKED_CTXSW
519 * Bits in flags field of signal_struct.
521 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
522 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
523 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
524 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
528 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
529 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
530 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
531 * values are inverted: lower p->prio value means higher priority.
533 * The MAX_USER_RT_PRIO value allows the actual maximum
534 * RT priority to be separate from the value exported to
535 * user-space. This allows kernel threads to set their
536 * priority to a value higher than any user task. Note:
537 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
540 #define MAX_USER_RT_PRIO 100
541 #define MAX_RT_PRIO MAX_USER_RT_PRIO
543 #define MAX_PRIO (MAX_RT_PRIO + 40)
545 #define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO)
546 #define rt_task(p) rt_prio((p)->prio)
547 #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH))
548 #define is_rt_policy(p) ((p) != SCHED_NORMAL && (p) != SCHED_BATCH)
549 #define has_rt_policy(p) unlikely(is_rt_policy((p)->policy))
552 * Some day this will be a full-fledged user tracking system..
555 atomic_t __count
; /* reference count */
556 atomic_t processes
; /* How many processes does this user have? */
557 atomic_t files
; /* How many open files does this user have? */
558 atomic_t sigpending
; /* How many pending signals does this user have? */
559 #ifdef CONFIG_INOTIFY_USER
560 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
561 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
563 /* protected by mq_lock */
564 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
565 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
568 struct key
*uid_keyring
; /* UID specific keyring */
569 struct key
*session_keyring
; /* UID's default session keyring */
572 /* Hash table maintenance information */
573 struct list_head uidhash_list
;
577 extern struct user_struct
*find_user(uid_t
);
579 extern struct user_struct root_user
;
580 #define INIT_USER (&root_user)
582 struct backing_dev_info
;
583 struct reclaim_state
;
585 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
587 /* cumulative counters */
588 unsigned long cpu_time
, /* time spent on the cpu */
589 run_delay
, /* time spent waiting on a runqueue */
590 pcnt
; /* # of timeslices run on this cpu */
593 unsigned long last_arrival
, /* when we last ran on a cpu */
594 last_queued
; /* when we were last queued to run */
596 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
598 #ifdef CONFIG_SCHEDSTATS
599 extern const struct file_operations proc_schedstat_operations
;
600 #endif /* CONFIG_SCHEDSTATS */
602 #ifdef CONFIG_TASK_DELAY_ACCT
603 struct task_delay_info
{
605 unsigned int flags
; /* Private per-task flags */
607 /* For each stat XXX, add following, aligned appropriately
609 * struct timespec XXX_start, XXX_end;
613 * Atomicity of updates to XXX_delay, XXX_count protected by
614 * single lock above (split into XXX_lock if contention is an issue).
618 * XXX_count is incremented on every XXX operation, the delay
619 * associated with the operation is added to XXX_delay.
620 * XXX_delay contains the accumulated delay time in nanoseconds.
622 struct timespec blkio_start
, blkio_end
; /* Shared by blkio, swapin */
623 u64 blkio_delay
; /* wait for sync block io completion */
624 u64 swapin_delay
; /* wait for swapin block io completion */
625 u32 blkio_count
; /* total count of the number of sync block */
626 /* io operations performed */
627 u32 swapin_count
; /* total count of the number of swapin block */
628 /* io operations performed */
630 #endif /* CONFIG_TASK_DELAY_ACCT */
632 static inline int sched_info_on(void)
634 #ifdef CONFIG_SCHEDSTATS
636 #elif defined(CONFIG_TASK_DELAY_ACCT)
637 extern int delayacct_on
;
652 * sched-domains (multiprocessor balancing) declarations:
654 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
657 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
658 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
659 #define SD_BALANCE_EXEC 4 /* Balance on exec */
660 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
661 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
662 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
663 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
664 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
665 #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */
666 #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */
667 #define SD_SERIALIZE 1024 /* Only a single load balancing instance */
669 #define BALANCE_FOR_MC_POWER \
670 (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
672 #define BALANCE_FOR_PKG_POWER \
673 ((sched_mc_power_savings || sched_smt_power_savings) ? \
674 SD_POWERSAVINGS_BALANCE : 0)
676 #define test_sd_parent(sd, flag) ((sd->parent && \
677 (sd->parent->flags & flag)) ? 1 : 0)
681 struct sched_group
*next
; /* Must be a circular list */
685 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
686 * single CPU. This is read only (except for setup, hotplug CPU).
687 * Note : Never change cpu_power without recompute its reciprocal
689 unsigned int __cpu_power
;
691 * reciprocal value of cpu_power to avoid expensive divides
692 * (see include/linux/reciprocal_div.h)
694 u32 reciprocal_cpu_power
;
697 struct sched_domain
{
698 /* These fields must be setup */
699 struct sched_domain
*parent
; /* top domain must be null terminated */
700 struct sched_domain
*child
; /* bottom domain must be null terminated */
701 struct sched_group
*groups
; /* the balancing groups of the domain */
702 cpumask_t span
; /* span of all CPUs in this domain */
703 unsigned long min_interval
; /* Minimum balance interval ms */
704 unsigned long max_interval
; /* Maximum balance interval ms */
705 unsigned int busy_factor
; /* less balancing by factor if busy */
706 unsigned int imbalance_pct
; /* No balance until over watermark */
707 unsigned long long cache_hot_time
; /* Task considered cache hot (ns) */
708 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
709 unsigned int busy_idx
;
710 unsigned int idle_idx
;
711 unsigned int newidle_idx
;
712 unsigned int wake_idx
;
713 unsigned int forkexec_idx
;
714 int flags
; /* See SD_* */
716 /* Runtime fields. */
717 unsigned long last_balance
; /* init to jiffies. units in jiffies */
718 unsigned int balance_interval
; /* initialise to 1. units in ms. */
719 unsigned int nr_balance_failed
; /* initialise to 0 */
721 #ifdef CONFIG_SCHEDSTATS
722 /* load_balance() stats */
723 unsigned long lb_cnt
[CPU_MAX_IDLE_TYPES
];
724 unsigned long lb_failed
[CPU_MAX_IDLE_TYPES
];
725 unsigned long lb_balanced
[CPU_MAX_IDLE_TYPES
];
726 unsigned long lb_imbalance
[CPU_MAX_IDLE_TYPES
];
727 unsigned long lb_gained
[CPU_MAX_IDLE_TYPES
];
728 unsigned long lb_hot_gained
[CPU_MAX_IDLE_TYPES
];
729 unsigned long lb_nobusyg
[CPU_MAX_IDLE_TYPES
];
730 unsigned long lb_nobusyq
[CPU_MAX_IDLE_TYPES
];
732 /* Active load balancing */
733 unsigned long alb_cnt
;
734 unsigned long alb_failed
;
735 unsigned long alb_pushed
;
737 /* SD_BALANCE_EXEC stats */
738 unsigned long sbe_cnt
;
739 unsigned long sbe_balanced
;
740 unsigned long sbe_pushed
;
742 /* SD_BALANCE_FORK stats */
743 unsigned long sbf_cnt
;
744 unsigned long sbf_balanced
;
745 unsigned long sbf_pushed
;
747 /* try_to_wake_up() stats */
748 unsigned long ttwu_wake_remote
;
749 unsigned long ttwu_move_affine
;
750 unsigned long ttwu_move_balance
;
754 extern int partition_sched_domains(cpumask_t
*partition1
,
755 cpumask_t
*partition2
);
757 #endif /* CONFIG_SMP */
760 struct io_context
; /* See blkdev.h */
763 #define NGROUPS_SMALL 32
764 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
768 gid_t small_block
[NGROUPS_SMALL
];
774 * get_group_info() must be called with the owning task locked (via task_lock())
775 * when task != current. The reason being that the vast majority of callers are
776 * looking at current->group_info, which can not be changed except by the
777 * current task. Changing current->group_info requires the task lock, too.
779 #define get_group_info(group_info) do { \
780 atomic_inc(&(group_info)->usage); \
783 #define put_group_info(group_info) do { \
784 if (atomic_dec_and_test(&(group_info)->usage)) \
785 groups_free(group_info); \
788 extern struct group_info
*groups_alloc(int gidsetsize
);
789 extern void groups_free(struct group_info
*group_info
);
790 extern int set_current_groups(struct group_info
*group_info
);
791 extern int groups_search(struct group_info
*group_info
, gid_t grp
);
792 /* access the groups "array" with this macro */
793 #define GROUP_AT(gi, i) \
794 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
796 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
797 extern void prefetch_stack(struct task_struct
*t
);
799 static inline void prefetch_stack(struct task_struct
*t
) { }
802 struct audit_context
; /* See audit.c */
804 struct pipe_inode_info
;
805 struct uts_namespace
;
809 SLEEP_NONINTERACTIVE
,
817 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
820 unsigned int flags
; /* per process flags, defined below */
823 int lock_depth
; /* BKL lock depth */
826 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
830 int load_weight
; /* for niceness load balancing purposes */
831 int prio
, static_prio
, normal_prio
;
832 struct list_head run_list
;
833 struct prio_array
*array
;
835 unsigned short ioprio
;
836 #ifdef CONFIG_BLK_DEV_IO_TRACE
837 unsigned int btrace_seq
;
839 unsigned long sleep_avg
;
840 unsigned long long timestamp
, last_ran
;
841 unsigned long long sched_time
; /* sched_clock time spent running */
842 enum sleep_type sleep_type
;
845 cpumask_t cpus_allowed
;
846 unsigned int time_slice
, first_time_slice
;
848 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
849 struct sched_info sched_info
;
852 struct list_head tasks
;
854 * ptrace_list/ptrace_children forms the list of my children
855 * that were stolen by a ptracer.
857 struct list_head ptrace_children
;
858 struct list_head ptrace_list
;
860 struct mm_struct
*mm
, *active_mm
;
863 struct linux_binfmt
*binfmt
;
865 int exit_code
, exit_signal
;
866 int pdeath_signal
; /* The signal sent when the parent dies */
868 unsigned int personality
;
873 #ifdef CONFIG_CC_STACKPROTECTOR
874 /* Canary value for the -fstack-protector gcc feature */
875 unsigned long stack_canary
;
878 * pointers to (original) parent process, youngest child, younger sibling,
879 * older sibling, respectively. (p->father can be replaced with
882 struct task_struct
*real_parent
; /* real parent process (when being debugged) */
883 struct task_struct
*parent
; /* parent process */
885 * children/sibling forms the list of my children plus the
886 * tasks I'm ptracing.
888 struct list_head children
; /* list of my children */
889 struct list_head sibling
; /* linkage in my parent's children list */
890 struct task_struct
*group_leader
; /* threadgroup leader */
892 /* PID/PID hash table linkage. */
893 struct pid_link pids
[PIDTYPE_MAX
];
894 struct list_head thread_group
;
896 struct completion
*vfork_done
; /* for vfork() */
897 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
898 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
900 unsigned int rt_priority
;
901 cputime_t utime
, stime
;
902 unsigned long nvcsw
, nivcsw
; /* context switch counts */
903 struct timespec start_time
;
904 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
905 unsigned long min_flt
, maj_flt
;
907 cputime_t it_prof_expires
, it_virt_expires
;
908 unsigned long long it_sched_expires
;
909 struct list_head cpu_timers
[3];
911 /* process credentials */
912 uid_t uid
,euid
,suid
,fsuid
;
913 gid_t gid
,egid
,sgid
,fsgid
;
914 struct group_info
*group_info
;
915 kernel_cap_t cap_effective
, cap_inheritable
, cap_permitted
;
916 unsigned keep_capabilities
:1;
917 struct user_struct
*user
;
919 struct key
*request_key_auth
; /* assumed request_key authority */
920 struct key
*thread_keyring
; /* keyring private to this thread */
921 unsigned char jit_keyring
; /* default keyring to attach requested keys to */
924 * fpu_counter contains the number of consecutive context switches
925 * that the FPU is used. If this is over a threshold, the lazy fpu
926 * saving becomes unlazy to save the trap. This is an unsigned char
927 * so that after 256 times the counter wraps and the behavior turns
928 * lazy again; this to deal with bursty apps that only use FPU for
931 unsigned char fpu_counter
;
932 int oomkilladj
; /* OOM kill score adjustment (bit shift). */
933 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
934 - access with [gs]et_task_comm (which lock
936 - initialized normally by flush_old_exec */
937 /* file system info */
938 int link_count
, total_link_count
;
939 #ifdef CONFIG_SYSVIPC
941 struct sysv_sem sysvsem
;
943 /* CPU-specific state of this task */
944 struct thread_struct thread
;
945 /* filesystem information */
946 struct fs_struct
*fs
;
947 /* open file information */
948 struct files_struct
*files
;
950 struct nsproxy
*nsproxy
;
951 /* signal handlers */
952 struct signal_struct
*signal
;
953 struct sighand_struct
*sighand
;
955 sigset_t blocked
, real_blocked
;
956 sigset_t saved_sigmask
; /* To be restored with TIF_RESTORE_SIGMASK */
957 struct sigpending pending
;
959 unsigned long sas_ss_sp
;
961 int (*notifier
)(void *priv
);
963 sigset_t
*notifier_mask
;
966 struct audit_context
*audit_context
;
969 /* Thread group tracking */
972 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
973 spinlock_t alloc_lock
;
975 /* Protection of the PI data structures: */
978 #ifdef CONFIG_RT_MUTEXES
979 /* PI waiters blocked on a rt_mutex held by this task */
980 struct plist_head pi_waiters
;
981 /* Deadlock detection and priority inheritance handling */
982 struct rt_mutex_waiter
*pi_blocked_on
;
985 #ifdef CONFIG_DEBUG_MUTEXES
986 /* mutex deadlock detection */
987 struct mutex_waiter
*blocked_on
;
989 #ifdef CONFIG_TRACE_IRQFLAGS
990 unsigned int irq_events
;
991 int hardirqs_enabled
;
992 unsigned long hardirq_enable_ip
;
993 unsigned int hardirq_enable_event
;
994 unsigned long hardirq_disable_ip
;
995 unsigned int hardirq_disable_event
;
996 int softirqs_enabled
;
997 unsigned long softirq_disable_ip
;
998 unsigned int softirq_disable_event
;
999 unsigned long softirq_enable_ip
;
1000 unsigned int softirq_enable_event
;
1001 int hardirq_context
;
1002 int softirq_context
;
1004 #ifdef CONFIG_LOCKDEP
1005 # define MAX_LOCK_DEPTH 30UL
1008 struct held_lock held_locks
[MAX_LOCK_DEPTH
];
1009 unsigned int lockdep_recursion
;
1012 /* journalling filesystem info */
1015 /* stacked block device info */
1016 struct bio
*bio_list
, **bio_tail
;
1019 struct reclaim_state
*reclaim_state
;
1021 struct backing_dev_info
*backing_dev_info
;
1023 struct io_context
*io_context
;
1025 unsigned long ptrace_message
;
1026 siginfo_t
*last_siginfo
; /* For ptrace use. */
1028 * current io wait handle: wait queue entry to use for io waits
1029 * If this thread is processing aio, this points at the waitqueue
1030 * inside the currently handled kiocb. It may be NULL (i.e. default
1031 * to a stack based synchronous wait) if its doing sync IO.
1033 wait_queue_t
*io_wait
;
1034 #ifdef CONFIG_TASK_XACCT
1035 /* i/o counters(bytes read/written, #syscalls */
1036 u64 rchar
, wchar
, syscr
, syscw
;
1038 struct task_io_accounting ioac
;
1039 #if defined(CONFIG_TASK_XACCT)
1040 u64 acct_rss_mem1
; /* accumulated rss usage */
1041 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
1042 cputime_t acct_stimexpd
;/* stime since last update */
1045 struct mempolicy
*mempolicy
;
1048 #ifdef CONFIG_CPUSETS
1049 struct cpuset
*cpuset
;
1050 nodemask_t mems_allowed
;
1051 int cpuset_mems_generation
;
1052 int cpuset_mem_spread_rotor
;
1054 struct robust_list_head __user
*robust_list
;
1055 #ifdef CONFIG_COMPAT
1056 struct compat_robust_list_head __user
*compat_robust_list
;
1058 struct list_head pi_state_list
;
1059 struct futex_pi_state
*pi_state_cache
;
1061 atomic_t fs_excl
; /* holding fs exclusive resources */
1062 struct rcu_head rcu
;
1065 * cache last used pipe for splice
1067 struct pipe_inode_info
*splice_pipe
;
1068 #ifdef CONFIG_TASK_DELAY_ACCT
1069 struct task_delay_info
*delays
;
1071 #ifdef CONFIG_FAULT_INJECTION
1076 static inline pid_t
process_group(struct task_struct
*tsk
)
1078 return tsk
->signal
->pgrp
;
1081 static inline pid_t
signal_session(struct signal_struct
*sig
)
1083 return sig
->__session
;
1086 static inline pid_t
process_session(struct task_struct
*tsk
)
1088 return signal_session(tsk
->signal
);
1091 static inline void set_signal_session(struct signal_struct
*sig
, pid_t session
)
1093 sig
->__session
= session
;
1096 static inline struct pid
*task_pid(struct task_struct
*task
)
1098 return task
->pids
[PIDTYPE_PID
].pid
;
1101 static inline struct pid
*task_tgid(struct task_struct
*task
)
1103 return task
->group_leader
->pids
[PIDTYPE_PID
].pid
;
1106 static inline struct pid
*task_pgrp(struct task_struct
*task
)
1108 return task
->group_leader
->pids
[PIDTYPE_PGID
].pid
;
1111 static inline struct pid
*task_session(struct task_struct
*task
)
1113 return task
->group_leader
->pids
[PIDTYPE_SID
].pid
;
1117 * pid_alive - check that a task structure is not stale
1118 * @p: Task structure to be checked.
1120 * Test if a process is not yet dead (at most zombie state)
1121 * If pid_alive fails, then pointers within the task structure
1122 * can be stale and must not be dereferenced.
1124 static inline int pid_alive(struct task_struct
*p
)
1126 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
1130 * is_init - check if a task structure is init
1131 * @tsk: Task structure to be checked.
1133 * Check if a task structure is the first user space task the kernel created.
1135 static inline int is_init(struct task_struct
*tsk
)
1137 return tsk
->pid
== 1;
1140 extern struct pid
*cad_pid
;
1142 extern void free_task(struct task_struct
*tsk
);
1143 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1145 extern void __put_task_struct(struct task_struct
*t
);
1147 static inline void put_task_struct(struct task_struct
*t
)
1149 if (atomic_dec_and_test(&t
->usage
))
1150 __put_task_struct(t
);
1156 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
1157 /* Not implemented yet, only for 486*/
1158 #define PF_STARTING 0x00000002 /* being created */
1159 #define PF_EXITING 0x00000004 /* getting shut down */
1160 #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
1161 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
1162 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
1163 #define PF_DUMPCORE 0x00000200 /* dumped core */
1164 #define PF_SIGNALED 0x00000400 /* killed by a signal */
1165 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
1166 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
1167 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
1168 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
1169 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
1170 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
1171 #define PF_KSWAPD 0x00040000 /* I am kswapd */
1172 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
1173 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
1174 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
1175 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
1176 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
1177 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
1178 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
1179 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
1180 #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
1181 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */
1184 * Only the _current_ task can read/write to tsk->flags, but other
1185 * tasks can access tsk->flags in readonly mode for example
1186 * with tsk_used_math (like during threaded core dumping).
1187 * There is however an exception to this rule during ptrace
1188 * or during fork: the ptracer task is allowed to write to the
1189 * child->flags of its traced child (same goes for fork, the parent
1190 * can write to the child->flags), because we're guaranteed the
1191 * child is not running and in turn not changing child->flags
1192 * at the same time the parent does it.
1194 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1195 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1196 #define clear_used_math() clear_stopped_child_used_math(current)
1197 #define set_used_math() set_stopped_child_used_math(current)
1198 #define conditional_stopped_child_used_math(condition, child) \
1199 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1200 #define conditional_used_math(condition) \
1201 conditional_stopped_child_used_math(condition, current)
1202 #define copy_to_stopped_child_used_math(child) \
1203 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1204 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1205 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1206 #define used_math() tsk_used_math(current)
1209 extern int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
);
1211 static inline int set_cpus_allowed(struct task_struct
*p
, cpumask_t new_mask
)
1213 if (!cpu_isset(0, new_mask
))
1219 extern unsigned long long sched_clock(void);
1220 extern unsigned long long
1221 current_sched_time(const struct task_struct
*current_task
);
1223 /* sched_exec is called by processes performing an exec */
1225 extern void sched_exec(void);
1227 #define sched_exec() {}
1230 #ifdef CONFIG_HOTPLUG_CPU
1231 extern void idle_task_exit(void);
1233 static inline void idle_task_exit(void) {}
1236 extern void sched_idle_next(void);
1238 #ifdef CONFIG_RT_MUTEXES
1239 extern int rt_mutex_getprio(struct task_struct
*p
);
1240 extern void rt_mutex_setprio(struct task_struct
*p
, int prio
);
1241 extern void rt_mutex_adjust_pi(struct task_struct
*p
);
1243 static inline int rt_mutex_getprio(struct task_struct
*p
)
1245 return p
->normal_prio
;
1247 # define rt_mutex_adjust_pi(p) do { } while (0)
1250 extern void set_user_nice(struct task_struct
*p
, long nice
);
1251 extern int task_prio(const struct task_struct
*p
);
1252 extern int task_nice(const struct task_struct
*p
);
1253 extern int can_nice(const struct task_struct
*p
, const int nice
);
1254 extern int task_curr(const struct task_struct
*p
);
1255 extern int idle_cpu(int cpu
);
1256 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1257 extern struct task_struct
*idle_task(int cpu
);
1258 extern struct task_struct
*curr_task(int cpu
);
1259 extern void set_curr_task(int cpu
, struct task_struct
*p
);
1264 * The default (Linux) execution domain.
1266 extern struct exec_domain default_exec_domain
;
1268 union thread_union
{
1269 struct thread_info thread_info
;
1270 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1273 #ifndef __HAVE_ARCH_KSTACK_END
1274 static inline int kstack_end(void *addr
)
1276 /* Reliable end of stack detection:
1277 * Some APM bios versions misalign the stack
1279 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1283 extern union thread_union init_thread_union
;
1284 extern struct task_struct init_task
;
1286 extern struct mm_struct init_mm
;
1288 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1289 extern struct task_struct
*find_task_by_pid_type(int type
, int pid
);
1290 extern void __set_special_pids(pid_t session
, pid_t pgrp
);
1292 /* per-UID process charging. */
1293 extern struct user_struct
* alloc_uid(uid_t
);
1294 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1296 atomic_inc(&u
->__count
);
1299 extern void free_uid(struct user_struct
*);
1300 extern void switch_uid(struct user_struct
*);
1302 #include <asm/current.h>
1304 extern void do_timer(unsigned long ticks
);
1306 extern int FASTCALL(wake_up_state(struct task_struct
* tsk
, unsigned int state
));
1307 extern int FASTCALL(wake_up_process(struct task_struct
* tsk
));
1308 extern void FASTCALL(wake_up_new_task(struct task_struct
* tsk
,
1309 unsigned long clone_flags
));
1311 extern void kick_process(struct task_struct
*tsk
);
1313 static inline void kick_process(struct task_struct
*tsk
) { }
1315 extern void FASTCALL(sched_fork(struct task_struct
* p
, int clone_flags
));
1316 extern void FASTCALL(sched_exit(struct task_struct
* p
));
1318 extern int in_group_p(gid_t
);
1319 extern int in_egroup_p(gid_t
);
1321 extern void proc_caches_init(void);
1322 extern void flush_signals(struct task_struct
*);
1323 extern void ignore_signals(struct task_struct
*);
1324 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1325 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1327 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1329 unsigned long flags
;
1332 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1333 ret
= dequeue_signal(tsk
, mask
, info
);
1334 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1339 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1341 extern void unblock_all_signals(void);
1342 extern void release_task(struct task_struct
* p
);
1343 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1344 extern int send_group_sig_info(int, struct siginfo
*, struct task_struct
*);
1345 extern int force_sigsegv(int, struct task_struct
*);
1346 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1347 extern int __kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1348 extern int kill_pgrp_info(int sig
, struct siginfo
*info
, struct pid
*pgrp
);
1349 extern int kill_pid_info(int sig
, struct siginfo
*info
, struct pid
*pid
);
1350 extern int kill_pid_info_as_uid(int, struct siginfo
*, struct pid
*, uid_t
, uid_t
, u32
);
1351 extern int kill_pgrp(struct pid
*pid
, int sig
, int priv
);
1352 extern int kill_pid(struct pid
*pid
, int sig
, int priv
);
1353 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1354 extern void do_notify_parent(struct task_struct
*, int);
1355 extern void force_sig(int, struct task_struct
*);
1356 extern void force_sig_specific(int, struct task_struct
*);
1357 extern int send_sig(int, struct task_struct
*, int);
1358 extern void zap_other_threads(struct task_struct
*p
);
1359 extern int kill_proc(pid_t
, int, int);
1360 extern struct sigqueue
*sigqueue_alloc(void);
1361 extern void sigqueue_free(struct sigqueue
*);
1362 extern int send_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1363 extern int send_group_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1364 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1365 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1367 static inline int kill_cad_pid(int sig
, int priv
)
1369 return kill_pid(cad_pid
, sig
, priv
);
1372 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1373 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1374 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1375 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1377 static inline int is_si_special(const struct siginfo
*info
)
1379 return info
<= SEND_SIG_FORCED
;
1382 /* True if we are on the alternate signal stack. */
1384 static inline int on_sig_stack(unsigned long sp
)
1386 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1389 static inline int sas_ss_flags(unsigned long sp
)
1391 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1392 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1396 * Routines for handling mm_structs
1398 extern struct mm_struct
* mm_alloc(void);
1400 /* mmdrop drops the mm and the page tables */
1401 extern void FASTCALL(__mmdrop(struct mm_struct
*));
1402 static inline void mmdrop(struct mm_struct
* mm
)
1404 if (atomic_dec_and_test(&mm
->mm_count
))
1408 /* mmput gets rid of the mappings and all user-space */
1409 extern void mmput(struct mm_struct
*);
1410 /* Grab a reference to a task's mm, if it is not already going away */
1411 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1412 /* Remove the current tasks stale references to the old mm_struct */
1413 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1415 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1416 extern void flush_thread(void);
1417 extern void exit_thread(void);
1419 extern void exit_files(struct task_struct
*);
1420 extern void __cleanup_signal(struct signal_struct
*);
1421 extern void __cleanup_sighand(struct sighand_struct
*);
1422 extern void exit_itimers(struct signal_struct
*);
1424 extern NORET_TYPE
void do_group_exit(int);
1426 extern void daemonize(const char *, ...);
1427 extern int allow_signal(int);
1428 extern int disallow_signal(int);
1430 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1431 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1432 struct task_struct
*fork_idle(int);
1434 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1435 extern void get_task_comm(char *to
, struct task_struct
*tsk
);
1438 extern void wait_task_inactive(struct task_struct
* p
);
1440 #define wait_task_inactive(p) do { } while (0)
1443 #define remove_parent(p) list_del_init(&(p)->sibling)
1444 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1446 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1448 #define for_each_process(p) \
1449 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1452 * Careful: do_each_thread/while_each_thread is a double loop so
1453 * 'break' will not work as expected - use goto instead.
1455 #define do_each_thread(g, t) \
1456 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1458 #define while_each_thread(g, t) \
1459 while ((t = next_thread(t)) != g)
1461 /* de_thread depends on thread_group_leader not being a pid based check */
1462 #define thread_group_leader(p) (p == p->group_leader)
1464 /* Do to the insanities of de_thread it is possible for a process
1465 * to have the pid of the thread group leader without actually being
1466 * the thread group leader. For iteration through the pids in proc
1467 * all we care about is that we have a task with the appropriate
1468 * pid, we don't actually care if we have the right task.
1470 static inline int has_group_leader_pid(struct task_struct
*p
)
1472 return p
->pid
== p
->tgid
;
1475 static inline struct task_struct
*next_thread(const struct task_struct
*p
)
1477 return list_entry(rcu_dereference(p
->thread_group
.next
),
1478 struct task_struct
, thread_group
);
1481 static inline int thread_group_empty(struct task_struct
*p
)
1483 return list_empty(&p
->thread_group
);
1486 #define delay_group_leader(p) \
1487 (thread_group_leader(p) && !thread_group_empty(p))
1490 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1491 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1492 * pins the final release of task.io_context. Also protects ->cpuset.
1494 * Nests both inside and outside of read_lock(&tasklist_lock).
1495 * It must not be nested with write_lock_irq(&tasklist_lock),
1496 * neither inside nor outside.
1498 static inline void task_lock(struct task_struct
*p
)
1500 spin_lock(&p
->alloc_lock
);
1503 static inline void task_unlock(struct task_struct
*p
)
1505 spin_unlock(&p
->alloc_lock
);
1508 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
1509 unsigned long *flags
);
1511 static inline void unlock_task_sighand(struct task_struct
*tsk
,
1512 unsigned long *flags
)
1514 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
1517 #ifndef __HAVE_THREAD_FUNCTIONS
1519 #define task_thread_info(task) ((struct thread_info *)(task)->stack)
1520 #define task_stack_page(task) ((task)->stack)
1522 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
1524 *task_thread_info(p
) = *task_thread_info(org
);
1525 task_thread_info(p
)->task
= p
;
1528 static inline unsigned long *end_of_stack(struct task_struct
*p
)
1530 return (unsigned long *)(task_thread_info(p
) + 1);
1535 /* set thread flags in other task's structures
1536 * - see asm/thread_info.h for TIF_xxxx flags available
1538 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1540 set_ti_thread_flag(task_thread_info(tsk
), flag
);
1543 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1545 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1548 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1550 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
1553 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1555 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1558 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1560 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
1563 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
1565 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1568 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
1570 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1573 static inline int signal_pending(struct task_struct
*p
)
1575 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
1578 static inline int need_resched(void)
1580 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
1584 * cond_resched() and cond_resched_lock(): latency reduction via
1585 * explicit rescheduling in places that are safe. The return
1586 * value indicates whether a reschedule was done in fact.
1587 * cond_resched_lock() will drop the spinlock before scheduling,
1588 * cond_resched_softirq() will enable bhs before scheduling.
1590 extern int cond_resched(void);
1591 extern int cond_resched_lock(spinlock_t
* lock
);
1592 extern int cond_resched_softirq(void);
1595 * Does a critical section need to be broken due to another
1598 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1599 # define need_lockbreak(lock) ((lock)->break_lock)
1601 # define need_lockbreak(lock) 0
1605 * Does a critical section need to be broken due to another
1606 * task waiting or preemption being signalled:
1608 static inline int lock_need_resched(spinlock_t
*lock
)
1610 if (need_lockbreak(lock
) || need_resched())
1616 * Reevaluate whether the task has signals pending delivery.
1617 * Wake the task if so.
1618 * This is required every time the blocked sigset_t changes.
1619 * callers must hold sighand->siglock.
1621 extern void recalc_sigpending_and_wake(struct task_struct
*t
);
1622 extern void recalc_sigpending(void);
1624 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
1627 * Wrappers for p->thread_info->cpu access. No-op on UP.
1631 static inline unsigned int task_cpu(const struct task_struct
*p
)
1633 return task_thread_info(p
)->cpu
;
1636 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1638 task_thread_info(p
)->cpu
= cpu
;
1643 static inline unsigned int task_cpu(const struct task_struct
*p
)
1648 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1652 #endif /* CONFIG_SMP */
1654 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1655 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
1657 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
)
1659 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
1660 mm
->get_unmapped_area
= arch_get_unmapped_area
;
1661 mm
->unmap_area
= arch_unmap_area
;
1665 extern long sched_setaffinity(pid_t pid
, cpumask_t new_mask
);
1666 extern long sched_getaffinity(pid_t pid
, cpumask_t
*mask
);
1668 extern int sched_mc_power_savings
, sched_smt_power_savings
;
1670 extern void normalize_rt_tasks(void);
1672 #ifdef CONFIG_TASK_XACCT
1673 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
1678 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
1683 static inline void inc_syscr(struct task_struct
*tsk
)
1688 static inline void inc_syscw(struct task_struct
*tsk
)
1693 static inline void add_rchar(struct task_struct
*tsk
, ssize_t amt
)
1697 static inline void add_wchar(struct task_struct
*tsk
, ssize_t amt
)
1701 static inline void inc_syscr(struct task_struct
*tsk
)
1705 static inline void inc_syscw(struct task_struct
*tsk
)
1710 #endif /* __KERNEL__ */