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>
77 #include <linux/time.h>
78 #include <linux/param.h>
79 #include <linux/resource.h>
80 #include <linux/timer.h>
81 #include <linux/hrtimer.h>
83 #include <asm/processor.h>
88 * List of flags we want to share for kernel threads,
89 * if only because they are not used by them anyway.
91 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
94 * These are the constant used to fake the fixed-point load-average
95 * counting. Some notes:
96 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
97 * a load-average precision of 10 bits integer + 11 bits fractional
98 * - if you want to count load-averages more often, you need more
99 * precision, or rounding will get you. With 2-second counting freq,
100 * the EXP_n values would be 1981, 2034 and 2043 if still using only
103 extern unsigned long avenrun
[]; /* Load averages */
105 #define FSHIFT 11 /* nr of bits of precision */
106 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
107 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
108 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
109 #define EXP_5 2014 /* 1/exp(5sec/5min) */
110 #define EXP_15 2037 /* 1/exp(5sec/15min) */
112 #define CALC_LOAD(load,exp,n) \
114 load += n*(FIXED_1-exp); \
117 extern unsigned long total_forks
;
118 extern int nr_threads
;
120 DECLARE_PER_CPU(unsigned long, process_counts
);
121 extern int nr_processes(void);
122 extern unsigned long nr_running(void);
123 extern unsigned long nr_uninterruptible(void);
124 extern unsigned long nr_active(void);
125 extern unsigned long nr_iowait(void);
126 extern unsigned long weighted_cpuload(const int cpu
);
130 * Task state bitmask. NOTE! These bits are also
131 * encoded in fs/proc/array.c: get_task_state().
133 * We have two separate sets of flags: task->state
134 * is about runnability, while task->exit_state are
135 * about the task exiting. Confusing, but this way
136 * modifying one set can't modify the other one by
139 #define TASK_RUNNING 0
140 #define TASK_INTERRUPTIBLE 1
141 #define TASK_UNINTERRUPTIBLE 2
142 #define TASK_STOPPED 4
143 #define TASK_TRACED 8
144 /* in tsk->exit_state */
145 #define EXIT_ZOMBIE 16
147 /* in tsk->state again */
148 #define TASK_NONINTERACTIVE 64
150 #define __set_task_state(tsk, state_value) \
151 do { (tsk)->state = (state_value); } while (0)
152 #define set_task_state(tsk, state_value) \
153 set_mb((tsk)->state, (state_value))
156 * set_current_state() includes a barrier so that the write of current->state
157 * is correctly serialised wrt the caller's subsequent test of whether to
160 * set_current_state(TASK_UNINTERRUPTIBLE);
161 * if (do_i_need_to_sleep())
164 * If the caller does not need such serialisation then use __set_current_state()
166 #define __set_current_state(state_value) \
167 do { current->state = (state_value); } while (0)
168 #define set_current_state(state_value) \
169 set_mb(current->state, (state_value))
171 /* Task command name length */
172 #define TASK_COMM_LEN 16
174 #include <linux/spinlock.h>
177 * This serializes "schedule()" and also protects
178 * the run-queue from deletions/modifications (but
179 * _adding_ to the beginning of the run-queue has
182 extern rwlock_t tasklist_lock
;
183 extern spinlock_t mmlist_lock
;
185 typedef struct task_struct task_t
;
187 extern void sched_init(void);
188 extern void sched_init_smp(void);
189 extern void init_idle(task_t
*idle
, int cpu
);
191 extern cpumask_t nohz_cpu_mask
;
193 extern void show_state(void);
194 extern void show_regs(struct pt_regs
*);
197 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
198 * task), SP is the stack pointer of the first frame that should be shown in the back
199 * trace (or NULL if the entire call-chain of the task should be shown).
201 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
203 void io_schedule(void);
204 long io_schedule_timeout(long timeout
);
206 extern void cpu_init (void);
207 extern void trap_init(void);
208 extern void update_process_times(int user
);
209 extern void scheduler_tick(void);
211 #ifdef CONFIG_DETECT_SOFTLOCKUP
212 extern void softlockup_tick(void);
213 extern void spawn_softlockup_task(void);
214 extern void touch_softlockup_watchdog(void);
216 static inline void softlockup_tick(void)
219 static inline void spawn_softlockup_task(void)
222 static inline void touch_softlockup_watchdog(void)
228 /* Attach to any functions which should be ignored in wchan output. */
229 #define __sched __attribute__((__section__(".sched.text")))
230 /* Is this address in the __sched functions? */
231 extern int in_sched_functions(unsigned long addr
);
233 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
234 extern signed long FASTCALL(schedule_timeout(signed long timeout
));
235 extern signed long schedule_timeout_interruptible(signed long timeout
);
236 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
237 asmlinkage
void schedule(void);
241 /* Maximum number of active map areas.. This is a random (large) number */
242 #define DEFAULT_MAX_MAP_COUNT 65536
244 extern int sysctl_max_map_count
;
246 #include <linux/aio.h>
249 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
250 unsigned long, unsigned long);
252 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
253 unsigned long len
, unsigned long pgoff
,
254 unsigned long flags
);
255 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
256 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
258 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
260 * The mm counters are not protected by its page_table_lock,
261 * so must be incremented atomically.
263 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
264 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
265 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
266 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
267 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
268 typedef atomic_long_t mm_counter_t
;
270 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
272 * The mm counters are protected by its page_table_lock,
273 * so can be incremented directly.
275 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
276 #define get_mm_counter(mm, member) ((mm)->_##member)
277 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
278 #define inc_mm_counter(mm, member) (mm)->_##member++
279 #define dec_mm_counter(mm, member) (mm)->_##member--
280 typedef unsigned long mm_counter_t
;
282 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
284 #define get_mm_rss(mm) \
285 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
286 #define update_hiwater_rss(mm) do { \
287 unsigned long _rss = get_mm_rss(mm); \
288 if ((mm)->hiwater_rss < _rss) \
289 (mm)->hiwater_rss = _rss; \
291 #define update_hiwater_vm(mm) do { \
292 if ((mm)->hiwater_vm < (mm)->total_vm) \
293 (mm)->hiwater_vm = (mm)->total_vm; \
297 struct vm_area_struct
* mmap
; /* list of VMAs */
298 struct rb_root mm_rb
;
299 struct vm_area_struct
* mmap_cache
; /* last find_vma result */
300 unsigned long (*get_unmapped_area
) (struct file
*filp
,
301 unsigned long addr
, unsigned long len
,
302 unsigned long pgoff
, unsigned long flags
);
303 void (*unmap_area
) (struct mm_struct
*mm
, unsigned long addr
);
304 unsigned long mmap_base
; /* base of mmap area */
305 unsigned long task_size
; /* size of task vm space */
306 unsigned long cached_hole_size
; /* if non-zero, the largest hole below free_area_cache */
307 unsigned long free_area_cache
; /* first hole of size cached_hole_size or larger */
309 atomic_t mm_users
; /* How many users with user space? */
310 atomic_t mm_count
; /* How many references to "struct mm_struct" (users count as 1) */
311 int map_count
; /* number of VMAs */
312 struct rw_semaphore mmap_sem
;
313 spinlock_t page_table_lock
; /* Protects page tables and some counters */
315 struct list_head mmlist
; /* List of maybe swapped mm's. These are globally strung
316 * together off init_mm.mmlist, and are protected
320 /* Special counters, in some configurations protected by the
321 * page_table_lock, in other configurations by being atomic.
323 mm_counter_t _file_rss
;
324 mm_counter_t _anon_rss
;
326 unsigned long hiwater_rss
; /* High-watermark of RSS usage */
327 unsigned long hiwater_vm
; /* High-water virtual memory usage */
329 unsigned long total_vm
, locked_vm
, shared_vm
, exec_vm
;
330 unsigned long stack_vm
, reserved_vm
, def_flags
, nr_ptes
;
331 unsigned long start_code
, end_code
, start_data
, end_data
;
332 unsigned long start_brk
, brk
, start_stack
;
333 unsigned long arg_start
, arg_end
, env_start
, env_end
;
335 unsigned long saved_auxv
[AT_VECTOR_SIZE
]; /* for /proc/PID/auxv */
338 cpumask_t cpu_vm_mask
;
340 /* Architecture-specific MM context */
341 mm_context_t context
;
343 /* Token based thrashing protection. */
344 unsigned long swap_token_time
;
347 /* coredumping support */
349 struct completion
*core_startup_done
, core_done
;
352 rwlock_t ioctx_list_lock
;
353 struct kioctx
*ioctx_list
;
356 struct sighand_struct
{
358 struct k_sigaction action
[_NSIG
];
362 struct pacct_struct
{
365 unsigned long ac_mem
;
366 cputime_t ac_utime
, ac_stime
;
367 unsigned long ac_minflt
, ac_majflt
;
371 * NOTE! "signal_struct" does not have it's own
372 * locking, because a shared signal_struct always
373 * implies a shared sighand_struct, so locking
374 * sighand_struct is always a proper superset of
375 * the locking of signal_struct.
377 struct signal_struct
{
381 wait_queue_head_t wait_chldexit
; /* for wait4() */
383 /* current thread group signal load-balancing target: */
386 /* shared signal handling: */
387 struct sigpending shared_pending
;
389 /* thread group exit support */
392 * - notify group_exit_task when ->count is equal to notify_count
393 * - everyone except group_exit_task is stopped during signal delivery
394 * of fatal signals, group_exit_task processes the signal.
396 struct task_struct
*group_exit_task
;
399 /* thread group stop support, overloads group_exit_code too */
400 int group_stop_count
;
401 unsigned int flags
; /* see SIGNAL_* flags below */
403 /* POSIX.1b Interval Timers */
404 struct list_head posix_timers
;
406 /* ITIMER_REAL timer for the process */
407 struct hrtimer real_timer
;
408 struct task_struct
*tsk
;
409 ktime_t it_real_incr
;
411 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
412 cputime_t it_prof_expires
, it_virt_expires
;
413 cputime_t it_prof_incr
, it_virt_incr
;
415 /* job control IDs */
419 /* boolean value for session group leader */
422 struct tty_struct
*tty
; /* NULL if no tty */
425 * Cumulative resource counters for dead threads in the group,
426 * and for reaped dead child processes forked by this group.
427 * Live threads maintain their own counters and add to these
428 * in __exit_signal, except for the group leader.
430 cputime_t utime
, stime
, cutime
, cstime
;
431 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
432 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
435 * Cumulative ns of scheduled CPU time for dead threads in the
436 * group, not including a zombie group leader. (This only differs
437 * from jiffies_to_ns(utime + stime) if sched_clock uses something
438 * other than jiffies.)
440 unsigned long long sched_time
;
443 * We don't bother to synchronize most readers of this at all,
444 * because there is no reader checking a limit that actually needs
445 * to get both rlim_cur and rlim_max atomically, and either one
446 * alone is a single word that can safely be read normally.
447 * getrlimit/setrlimit use task_lock(current->group_leader) to
448 * protect this instead of the siglock, because they really
449 * have no need to disable irqs.
451 struct rlimit rlim
[RLIM_NLIMITS
];
453 struct list_head cpu_timers
[3];
455 /* keep the process-shared keyrings here so that they do the right
456 * thing in threads created with CLONE_THREAD */
458 struct key
*session_keyring
; /* keyring inherited over fork */
459 struct key
*process_keyring
; /* keyring private to this process */
461 #ifdef CONFIG_BSD_PROCESS_ACCT
462 struct pacct_struct pacct
; /* per-process accounting information */
466 /* Context switch must be unlocked if interrupts are to be enabled */
467 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
468 # define __ARCH_WANT_UNLOCKED_CTXSW
472 * Bits in flags field of signal_struct.
474 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
475 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
476 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
477 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
481 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
482 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
483 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
484 * values are inverted: lower p->prio value means higher priority.
486 * The MAX_USER_RT_PRIO value allows the actual maximum
487 * RT priority to be separate from the value exported to
488 * user-space. This allows kernel threads to set their
489 * priority to a value higher than any user task. Note:
490 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
493 #define MAX_USER_RT_PRIO 100
494 #define MAX_RT_PRIO MAX_USER_RT_PRIO
496 #define MAX_PRIO (MAX_RT_PRIO + 40)
498 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
499 #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH))
502 * Some day this will be a full-fledged user tracking system..
505 atomic_t __count
; /* reference count */
506 atomic_t processes
; /* How many processes does this user have? */
507 atomic_t files
; /* How many open files does this user have? */
508 atomic_t sigpending
; /* How many pending signals does this user have? */
509 #ifdef CONFIG_INOTIFY_USER
510 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
511 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
513 /* protected by mq_lock */
514 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
515 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
518 struct key
*uid_keyring
; /* UID specific keyring */
519 struct key
*session_keyring
; /* UID's default session keyring */
522 /* Hash table maintenance information */
523 struct list_head uidhash_list
;
527 extern struct user_struct
*find_user(uid_t
);
529 extern struct user_struct root_user
;
530 #define INIT_USER (&root_user)
532 typedef struct prio_array prio_array_t
;
533 struct backing_dev_info
;
534 struct reclaim_state
;
536 #ifdef CONFIG_SCHEDSTATS
538 /* cumulative counters */
539 unsigned long cpu_time
, /* time spent on the cpu */
540 run_delay
, /* time spent waiting on a runqueue */
541 pcnt
; /* # of timeslices run on this cpu */
544 unsigned long last_arrival
, /* when we last ran on a cpu */
545 last_queued
; /* when we were last queued to run */
548 extern struct file_operations proc_schedstat_operations
;
560 * sched-domains (multiprocessor balancing) declarations:
562 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
565 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
566 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
567 #define SD_BALANCE_EXEC 4 /* Balance on exec */
568 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
569 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
570 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
571 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
572 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
575 struct sched_group
*next
; /* Must be a circular list */
579 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
580 * single CPU. This is read only (except for setup, hotplug CPU).
582 unsigned long cpu_power
;
585 struct sched_domain
{
586 /* These fields must be setup */
587 struct sched_domain
*parent
; /* top domain must be null terminated */
588 struct sched_group
*groups
; /* the balancing groups of the domain */
589 cpumask_t span
; /* span of all CPUs in this domain */
590 unsigned long min_interval
; /* Minimum balance interval ms */
591 unsigned long max_interval
; /* Maximum balance interval ms */
592 unsigned int busy_factor
; /* less balancing by factor if busy */
593 unsigned int imbalance_pct
; /* No balance until over watermark */
594 unsigned long long cache_hot_time
; /* Task considered cache hot (ns) */
595 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
596 unsigned int per_cpu_gain
; /* CPU % gained by adding domain cpus */
597 unsigned int busy_idx
;
598 unsigned int idle_idx
;
599 unsigned int newidle_idx
;
600 unsigned int wake_idx
;
601 unsigned int forkexec_idx
;
602 int flags
; /* See SD_* */
604 /* Runtime fields. */
605 unsigned long last_balance
; /* init to jiffies. units in jiffies */
606 unsigned int balance_interval
; /* initialise to 1. units in ms. */
607 unsigned int nr_balance_failed
; /* initialise to 0 */
609 #ifdef CONFIG_SCHEDSTATS
610 /* load_balance() stats */
611 unsigned long lb_cnt
[MAX_IDLE_TYPES
];
612 unsigned long lb_failed
[MAX_IDLE_TYPES
];
613 unsigned long lb_balanced
[MAX_IDLE_TYPES
];
614 unsigned long lb_imbalance
[MAX_IDLE_TYPES
];
615 unsigned long lb_gained
[MAX_IDLE_TYPES
];
616 unsigned long lb_hot_gained
[MAX_IDLE_TYPES
];
617 unsigned long lb_nobusyg
[MAX_IDLE_TYPES
];
618 unsigned long lb_nobusyq
[MAX_IDLE_TYPES
];
620 /* Active load balancing */
621 unsigned long alb_cnt
;
622 unsigned long alb_failed
;
623 unsigned long alb_pushed
;
625 /* SD_BALANCE_EXEC stats */
626 unsigned long sbe_cnt
;
627 unsigned long sbe_balanced
;
628 unsigned long sbe_pushed
;
630 /* SD_BALANCE_FORK stats */
631 unsigned long sbf_cnt
;
632 unsigned long sbf_balanced
;
633 unsigned long sbf_pushed
;
635 /* try_to_wake_up() stats */
636 unsigned long ttwu_wake_remote
;
637 unsigned long ttwu_move_affine
;
638 unsigned long ttwu_move_balance
;
642 extern int partition_sched_domains(cpumask_t
*partition1
,
643 cpumask_t
*partition2
);
646 * Maximum cache size the migration-costs auto-tuning code will
649 extern unsigned int max_cache_size
;
651 #endif /* CONFIG_SMP */
654 struct io_context
; /* See blkdev.h */
655 void exit_io_context(void);
658 #define NGROUPS_SMALL 32
659 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
663 gid_t small_block
[NGROUPS_SMALL
];
669 * get_group_info() must be called with the owning task locked (via task_lock())
670 * when task != current. The reason being that the vast majority of callers are
671 * looking at current->group_info, which can not be changed except by the
672 * current task. Changing current->group_info requires the task lock, too.
674 #define get_group_info(group_info) do { \
675 atomic_inc(&(group_info)->usage); \
678 #define put_group_info(group_info) do { \
679 if (atomic_dec_and_test(&(group_info)->usage)) \
680 groups_free(group_info); \
683 extern struct group_info
*groups_alloc(int gidsetsize
);
684 extern void groups_free(struct group_info
*group_info
);
685 extern int set_current_groups(struct group_info
*group_info
);
686 extern int groups_search(struct group_info
*group_info
, gid_t grp
);
687 /* access the groups "array" with this macro */
688 #define GROUP_AT(gi, i) \
689 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
691 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
692 extern void prefetch_stack(struct task_struct
*);
694 static inline void prefetch_stack(struct task_struct
*t
) { }
697 struct audit_context
; /* See audit.c */
699 struct pipe_inode_info
;
703 SLEEP_NONINTERACTIVE
,
709 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
710 struct thread_info
*thread_info
;
712 unsigned long flags
; /* per process flags, defined below */
713 unsigned long ptrace
;
715 int lock_depth
; /* BKL lock depth */
718 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
722 int load_weight
; /* for niceness load balancing purposes */
723 int prio
, static_prio
;
724 struct list_head run_list
;
727 unsigned short ioprio
;
728 unsigned int btrace_seq
;
730 unsigned long sleep_avg
;
731 unsigned long long timestamp
, last_ran
;
732 unsigned long long sched_time
; /* sched_clock time spent running */
733 enum sleep_type sleep_type
;
735 unsigned long policy
;
736 cpumask_t cpus_allowed
;
737 unsigned int time_slice
, first_time_slice
;
739 #ifdef CONFIG_SCHEDSTATS
740 struct sched_info sched_info
;
743 struct list_head tasks
;
745 * ptrace_list/ptrace_children forms the list of my children
746 * that were stolen by a ptracer.
748 struct list_head ptrace_children
;
749 struct list_head ptrace_list
;
751 struct mm_struct
*mm
, *active_mm
;
754 struct linux_binfmt
*binfmt
;
756 int exit_code
, exit_signal
;
757 int pdeath_signal
; /* The signal sent when the parent dies */
759 unsigned long personality
;
764 * pointers to (original) parent process, youngest child, younger sibling,
765 * older sibling, respectively. (p->father can be replaced with
768 struct task_struct
*real_parent
; /* real parent process (when being debugged) */
769 struct task_struct
*parent
; /* parent process */
771 * children/sibling forms the list of my children plus the
772 * tasks I'm ptracing.
774 struct list_head children
; /* list of my children */
775 struct list_head sibling
; /* linkage in my parent's children list */
776 struct task_struct
*group_leader
; /* threadgroup leader */
778 /* PID/PID hash table linkage. */
779 struct pid_link pids
[PIDTYPE_MAX
];
780 struct list_head thread_group
;
782 struct completion
*vfork_done
; /* for vfork() */
783 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
784 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
786 unsigned long rt_priority
;
787 cputime_t utime
, stime
;
788 unsigned long nvcsw
, nivcsw
; /* context switch counts */
789 struct timespec start_time
;
790 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
791 unsigned long min_flt
, maj_flt
;
793 cputime_t it_prof_expires
, it_virt_expires
;
794 unsigned long long it_sched_expires
;
795 struct list_head cpu_timers
[3];
797 /* process credentials */
798 uid_t uid
,euid
,suid
,fsuid
;
799 gid_t gid
,egid
,sgid
,fsgid
;
800 struct group_info
*group_info
;
801 kernel_cap_t cap_effective
, cap_inheritable
, cap_permitted
;
802 unsigned keep_capabilities
:1;
803 struct user_struct
*user
;
805 struct key
*request_key_auth
; /* assumed request_key authority */
806 struct key
*thread_keyring
; /* keyring private to this thread */
807 unsigned char jit_keyring
; /* default keyring to attach requested keys to */
809 int oomkilladj
; /* OOM kill score adjustment (bit shift). */
810 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
811 - access with [gs]et_task_comm (which lock
813 - initialized normally by flush_old_exec */
814 /* file system info */
815 int link_count
, total_link_count
;
817 struct sysv_sem sysvsem
;
818 /* CPU-specific state of this task */
819 struct thread_struct thread
;
820 /* filesystem information */
821 struct fs_struct
*fs
;
822 /* open file information */
823 struct files_struct
*files
;
825 struct namespace *namespace;
826 /* signal handlers */
827 struct signal_struct
*signal
;
828 struct sighand_struct
*sighand
;
830 sigset_t blocked
, real_blocked
;
831 sigset_t saved_sigmask
; /* To be restored with TIF_RESTORE_SIGMASK */
832 struct sigpending pending
;
834 unsigned long sas_ss_sp
;
836 int (*notifier
)(void *priv
);
838 sigset_t
*notifier_mask
;
841 struct audit_context
*audit_context
;
844 /* Thread group tracking */
847 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
848 spinlock_t alloc_lock
;
850 #ifdef CONFIG_DEBUG_MUTEXES
851 /* mutex deadlock detection */
852 struct mutex_waiter
*blocked_on
;
855 /* journalling filesystem info */
859 struct reclaim_state
*reclaim_state
;
861 struct backing_dev_info
*backing_dev_info
;
863 struct io_context
*io_context
;
865 unsigned long ptrace_message
;
866 siginfo_t
*last_siginfo
; /* For ptrace use. */
868 * current io wait handle: wait queue entry to use for io waits
869 * If this thread is processing aio, this points at the waitqueue
870 * inside the currently handled kiocb. It may be NULL (i.e. default
871 * to a stack based synchronous wait) if its doing sync IO.
873 wait_queue_t
*io_wait
;
874 /* i/o counters(bytes read/written, #syscalls */
875 u64 rchar
, wchar
, syscr
, syscw
;
876 #if defined(CONFIG_BSD_PROCESS_ACCT)
877 u64 acct_rss_mem1
; /* accumulated rss usage */
878 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
879 clock_t acct_stimexpd
; /* clock_t-converted stime since last update */
882 struct mempolicy
*mempolicy
;
885 #ifdef CONFIG_CPUSETS
886 struct cpuset
*cpuset
;
887 nodemask_t mems_allowed
;
888 int cpuset_mems_generation
;
889 int cpuset_mem_spread_rotor
;
891 struct robust_list_head __user
*robust_list
;
893 struct compat_robust_list_head __user
*compat_robust_list
;
896 atomic_t fs_excl
; /* holding fs exclusive resources */
900 * cache last used pipe for splice
902 struct pipe_inode_info
*splice_pipe
;
905 static inline pid_t
process_group(struct task_struct
*tsk
)
907 return tsk
->signal
->pgrp
;
911 * pid_alive - check that a task structure is not stale
912 * @p: Task structure to be checked.
914 * Test if a process is not yet dead (at most zombie state)
915 * If pid_alive fails, then pointers within the task structure
916 * can be stale and must not be dereferenced.
918 static inline int pid_alive(struct task_struct
*p
)
920 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
923 extern void free_task(struct task_struct
*tsk
);
924 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
926 extern void __put_task_struct(struct task_struct
*t
);
928 static inline void put_task_struct(struct task_struct
*t
)
930 if (atomic_dec_and_test(&t
->usage
))
931 __put_task_struct(t
);
937 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
938 /* Not implemented yet, only for 486*/
939 #define PF_STARTING 0x00000002 /* being created */
940 #define PF_EXITING 0x00000004 /* getting shut down */
941 #define PF_DEAD 0x00000008 /* Dead */
942 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
943 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
944 #define PF_DUMPCORE 0x00000200 /* dumped core */
945 #define PF_SIGNALED 0x00000400 /* killed by a signal */
946 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
947 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
948 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
949 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
950 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
951 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
952 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
953 #define PF_KSWAPD 0x00040000 /* I am kswapd */
954 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
955 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
956 #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */
957 #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
958 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
959 #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
960 #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
961 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
964 * Only the _current_ task can read/write to tsk->flags, but other
965 * tasks can access tsk->flags in readonly mode for example
966 * with tsk_used_math (like during threaded core dumping).
967 * There is however an exception to this rule during ptrace
968 * or during fork: the ptracer task is allowed to write to the
969 * child->flags of its traced child (same goes for fork, the parent
970 * can write to the child->flags), because we're guaranteed the
971 * child is not running and in turn not changing child->flags
972 * at the same time the parent does it.
974 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
975 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
976 #define clear_used_math() clear_stopped_child_used_math(current)
977 #define set_used_math() set_stopped_child_used_math(current)
978 #define conditional_stopped_child_used_math(condition, child) \
979 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
980 #define conditional_used_math(condition) \
981 conditional_stopped_child_used_math(condition, current)
982 #define copy_to_stopped_child_used_math(child) \
983 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
984 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
985 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
986 #define used_math() tsk_used_math(current)
989 extern int set_cpus_allowed(task_t
*p
, cpumask_t new_mask
);
991 static inline int set_cpus_allowed(task_t
*p
, cpumask_t new_mask
)
993 if (!cpu_isset(0, new_mask
))
999 extern unsigned long long sched_clock(void);
1000 extern unsigned long long current_sched_time(const task_t
*current_task
);
1002 /* sched_exec is called by processes performing an exec */
1004 extern void sched_exec(void);
1006 #define sched_exec() {}
1009 #ifdef CONFIG_HOTPLUG_CPU
1010 extern void idle_task_exit(void);
1012 static inline void idle_task_exit(void) {}
1015 extern void sched_idle_next(void);
1016 extern void set_user_nice(task_t
*p
, long nice
);
1017 extern int task_prio(const task_t
*p
);
1018 extern int task_nice(const task_t
*p
);
1019 extern int can_nice(const task_t
*p
, const int nice
);
1020 extern int task_curr(const task_t
*p
);
1021 extern int idle_cpu(int cpu
);
1022 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1023 extern task_t
*idle_task(int cpu
);
1024 extern task_t
*curr_task(int cpu
);
1025 extern void set_curr_task(int cpu
, task_t
*p
);
1030 * The default (Linux) execution domain.
1032 extern struct exec_domain default_exec_domain
;
1034 union thread_union
{
1035 struct thread_info thread_info
;
1036 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1039 #ifndef __HAVE_ARCH_KSTACK_END
1040 static inline int kstack_end(void *addr
)
1042 /* Reliable end of stack detection:
1043 * Some APM bios versions misalign the stack
1045 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1049 extern union thread_union init_thread_union
;
1050 extern struct task_struct init_task
;
1052 extern struct mm_struct init_mm
;
1054 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1055 extern struct task_struct
*find_task_by_pid_type(int type
, int pid
);
1056 extern void set_special_pids(pid_t session
, pid_t pgrp
);
1057 extern void __set_special_pids(pid_t session
, pid_t pgrp
);
1059 /* per-UID process charging. */
1060 extern struct user_struct
* alloc_uid(uid_t
);
1061 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1063 atomic_inc(&u
->__count
);
1066 extern void free_uid(struct user_struct
*);
1067 extern void switch_uid(struct user_struct
*);
1069 #include <asm/current.h>
1071 extern void do_timer(struct pt_regs
*);
1073 extern int FASTCALL(wake_up_state(struct task_struct
* tsk
, unsigned int state
));
1074 extern int FASTCALL(wake_up_process(struct task_struct
* tsk
));
1075 extern void FASTCALL(wake_up_new_task(struct task_struct
* tsk
,
1076 unsigned long clone_flags
));
1078 extern void kick_process(struct task_struct
*tsk
);
1080 static inline void kick_process(struct task_struct
*tsk
) { }
1082 extern void FASTCALL(sched_fork(task_t
* p
, int clone_flags
));
1083 extern void FASTCALL(sched_exit(task_t
* p
));
1085 extern int in_group_p(gid_t
);
1086 extern int in_egroup_p(gid_t
);
1088 extern void proc_caches_init(void);
1089 extern void flush_signals(struct task_struct
*);
1090 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1091 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1093 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1095 unsigned long flags
;
1098 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1099 ret
= dequeue_signal(tsk
, mask
, info
);
1100 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1105 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1107 extern void unblock_all_signals(void);
1108 extern void release_task(struct task_struct
* p
);
1109 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1110 extern int send_group_sig_info(int, struct siginfo
*, struct task_struct
*);
1111 extern int force_sigsegv(int, struct task_struct
*);
1112 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1113 extern int __kill_pg_info(int sig
, struct siginfo
*info
, pid_t pgrp
);
1114 extern int kill_pg_info(int, struct siginfo
*, pid_t
);
1115 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1116 extern int kill_proc_info_as_uid(int, struct siginfo
*, pid_t
, uid_t
, uid_t
);
1117 extern void do_notify_parent(struct task_struct
*, int);
1118 extern void force_sig(int, struct task_struct
*);
1119 extern void force_sig_specific(int, struct task_struct
*);
1120 extern int send_sig(int, struct task_struct
*, int);
1121 extern void zap_other_threads(struct task_struct
*p
);
1122 extern int kill_pg(pid_t
, int, int);
1123 extern int kill_proc(pid_t
, int, int);
1124 extern struct sigqueue
*sigqueue_alloc(void);
1125 extern void sigqueue_free(struct sigqueue
*);
1126 extern int send_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1127 extern int send_group_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1128 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1129 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1131 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1132 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1133 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1134 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1136 static inline int is_si_special(const struct siginfo
*info
)
1138 return info
<= SEND_SIG_FORCED
;
1141 /* True if we are on the alternate signal stack. */
1143 static inline int on_sig_stack(unsigned long sp
)
1145 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1148 static inline int sas_ss_flags(unsigned long sp
)
1150 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1151 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1155 * Routines for handling mm_structs
1157 extern struct mm_struct
* mm_alloc(void);
1159 /* mmdrop drops the mm and the page tables */
1160 extern void FASTCALL(__mmdrop(struct mm_struct
*));
1161 static inline void mmdrop(struct mm_struct
* mm
)
1163 if (atomic_dec_and_test(&mm
->mm_count
))
1167 /* mmput gets rid of the mappings and all user-space */
1168 extern void mmput(struct mm_struct
*);
1169 /* Grab a reference to a task's mm, if it is not already going away */
1170 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1171 /* Remove the current tasks stale references to the old mm_struct */
1172 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1174 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1175 extern void flush_thread(void);
1176 extern void exit_thread(void);
1178 extern void exit_files(struct task_struct
*);
1179 extern void __cleanup_signal(struct signal_struct
*);
1180 extern void __cleanup_sighand(struct sighand_struct
*);
1181 extern void exit_itimers(struct signal_struct
*);
1183 extern NORET_TYPE
void do_group_exit(int);
1185 extern void daemonize(const char *, ...);
1186 extern int allow_signal(int);
1187 extern int disallow_signal(int);
1188 extern task_t
*child_reaper
;
1190 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1191 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1192 task_t
*fork_idle(int);
1194 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1195 extern void get_task_comm(char *to
, struct task_struct
*tsk
);
1198 extern void wait_task_inactive(task_t
* p
);
1200 #define wait_task_inactive(p) do { } while (0)
1203 #define remove_parent(p) list_del_init(&(p)->sibling)
1204 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1206 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1208 #define for_each_process(p) \
1209 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1212 * Careful: do_each_thread/while_each_thread is a double loop so
1213 * 'break' will not work as expected - use goto instead.
1215 #define do_each_thread(g, t) \
1216 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1218 #define while_each_thread(g, t) \
1219 while ((t = next_thread(t)) != g)
1221 /* de_thread depends on thread_group_leader not being a pid based check */
1222 #define thread_group_leader(p) (p == p->group_leader)
1224 static inline task_t
*next_thread(const task_t
*p
)
1226 return list_entry(rcu_dereference(p
->thread_group
.next
),
1227 task_t
, thread_group
);
1230 static inline int thread_group_empty(task_t
*p
)
1232 return list_empty(&p
->thread_group
);
1235 #define delay_group_leader(p) \
1236 (thread_group_leader(p) && !thread_group_empty(p))
1239 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1240 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1241 * pins the final release of task.io_context. Also protects ->cpuset.
1243 * Nests both inside and outside of read_lock(&tasklist_lock).
1244 * It must not be nested with write_lock_irq(&tasklist_lock),
1245 * neither inside nor outside.
1247 static inline void task_lock(struct task_struct
*p
)
1249 spin_lock(&p
->alloc_lock
);
1252 static inline void task_unlock(struct task_struct
*p
)
1254 spin_unlock(&p
->alloc_lock
);
1257 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
1258 unsigned long *flags
);
1260 static inline void unlock_task_sighand(struct task_struct
*tsk
,
1261 unsigned long *flags
)
1263 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
1266 #ifndef __HAVE_THREAD_FUNCTIONS
1268 #define task_thread_info(task) (task)->thread_info
1269 #define task_stack_page(task) ((void*)((task)->thread_info))
1271 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
1273 *task_thread_info(p
) = *task_thread_info(org
);
1274 task_thread_info(p
)->task
= p
;
1277 static inline unsigned long *end_of_stack(struct task_struct
*p
)
1279 return (unsigned long *)(p
->thread_info
+ 1);
1284 /* set thread flags in other task's structures
1285 * - see asm/thread_info.h for TIF_xxxx flags available
1287 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1289 set_ti_thread_flag(task_thread_info(tsk
), flag
);
1292 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1294 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1297 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1299 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
1302 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1304 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1307 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1309 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
1312 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
1314 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1317 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
1319 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1322 static inline int signal_pending(struct task_struct
*p
)
1324 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
1327 static inline int need_resched(void)
1329 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
1333 * cond_resched() and cond_resched_lock(): latency reduction via
1334 * explicit rescheduling in places that are safe. The return
1335 * value indicates whether a reschedule was done in fact.
1336 * cond_resched_lock() will drop the spinlock before scheduling,
1337 * cond_resched_softirq() will enable bhs before scheduling.
1339 extern int cond_resched(void);
1340 extern int cond_resched_lock(spinlock_t
* lock
);
1341 extern int cond_resched_softirq(void);
1344 * Does a critical section need to be broken due to another
1347 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1348 # define need_lockbreak(lock) ((lock)->break_lock)
1350 # define need_lockbreak(lock) 0
1354 * Does a critical section need to be broken due to another
1355 * task waiting or preemption being signalled:
1357 static inline int lock_need_resched(spinlock_t
*lock
)
1359 if (need_lockbreak(lock
) || need_resched())
1364 /* Reevaluate whether the task has signals pending delivery.
1365 This is required every time the blocked sigset_t changes.
1366 callers must hold sighand->siglock. */
1368 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct
*t
));
1369 extern void recalc_sigpending(void);
1371 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
1374 * Wrappers for p->thread_info->cpu access. No-op on UP.
1378 static inline unsigned int task_cpu(const struct task_struct
*p
)
1380 return task_thread_info(p
)->cpu
;
1383 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1385 task_thread_info(p
)->cpu
= cpu
;
1390 static inline unsigned int task_cpu(const struct task_struct
*p
)
1395 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1399 #endif /* CONFIG_SMP */
1401 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1402 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
1404 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
)
1406 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
1407 mm
->get_unmapped_area
= arch_get_unmapped_area
;
1408 mm
->unmap_area
= arch_unmap_area
;
1412 extern long sched_setaffinity(pid_t pid
, cpumask_t new_mask
);
1413 extern long sched_getaffinity(pid_t pid
, cpumask_t
*mask
);
1415 extern void normalize_rt_tasks(void);
1419 * Check if a process has been frozen
1421 static inline int frozen(struct task_struct
*p
)
1423 return p
->flags
& PF_FROZEN
;
1427 * Check if there is a request to freeze a process
1429 static inline int freezing(struct task_struct
*p
)
1431 return p
->flags
& PF_FREEZE
;
1435 * Request that a process be frozen
1436 * FIXME: SMP problem. We may not modify other process' flags!
1438 static inline void freeze(struct task_struct
*p
)
1440 p
->flags
|= PF_FREEZE
;
1444 * Wake up a frozen process
1446 static inline int thaw_process(struct task_struct
*p
)
1449 p
->flags
&= ~PF_FROZEN
;
1457 * freezing is complete, mark process as frozen
1459 static inline void frozen_process(struct task_struct
*p
)
1461 p
->flags
= (p
->flags
& ~PF_FREEZE
) | PF_FROZEN
;
1464 extern void refrigerator(void);
1465 extern int freeze_processes(void);
1466 extern void thaw_processes(void);
1468 static inline int try_to_freeze(void)
1470 if (freezing(current
)) {
1477 static inline int frozen(struct task_struct
*p
) { return 0; }
1478 static inline int freezing(struct task_struct
*p
) { return 0; }
1479 static inline void freeze(struct task_struct
*p
) { BUG(); }
1480 static inline int thaw_process(struct task_struct
*p
) { return 1; }
1481 static inline void frozen_process(struct task_struct
*p
) { BUG(); }
1483 static inline void refrigerator(void) {}
1484 static inline int freeze_processes(void) { BUG(); return 0; }
1485 static inline void thaw_processes(void) {}
1487 static inline int try_to_freeze(void) { return 0; }
1489 #endif /* CONFIG_PM */
1490 #endif /* __KERNEL__ */