4 #include <asm/param.h> /* for HZ */
6 #include <linux/config.h>
7 #include <linux/capability.h>
8 #include <linux/threads.h>
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11 #include <linux/timex.h>
12 #include <linux/jiffies.h>
13 #include <linux/rbtree.h>
14 #include <linux/thread_info.h>
15 #include <linux/cpumask.h>
16 #include <linux/errno.h>
17 #include <linux/nodemask.h>
19 #include <asm/system.h>
20 #include <asm/semaphore.h>
22 #include <asm/ptrace.h>
24 #include <asm/cputime.h>
26 #include <linux/smp.h>
27 #include <linux/sem.h>
28 #include <linux/signal.h>
29 #include <linux/securebits.h>
30 #include <linux/fs_struct.h>
31 #include <linux/compiler.h>
32 #include <linux/completion.h>
33 #include <linux/pid.h>
34 #include <linux/percpu.h>
35 #include <linux/topology.h>
36 #include <linux/seccomp.h>
37 #include <linux/rcupdate.h>
38 #include <linux/futex.h>
40 #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
47 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
48 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
49 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
50 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
51 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
52 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
53 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
54 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
55 #define CLONE_THREAD 0x00010000 /* Same thread group? */
56 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
57 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
58 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
59 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
60 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
61 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
62 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
63 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
64 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
67 * List of flags we want to share for kernel threads,
68 * if only because they are not used by them anyway.
70 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
73 * These are the constant used to fake the fixed-point load-average
74 * counting. Some notes:
75 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
76 * a load-average precision of 10 bits integer + 11 bits fractional
77 * - if you want to count load-averages more often, you need more
78 * precision, or rounding will get you. With 2-second counting freq,
79 * the EXP_n values would be 1981, 2034 and 2043 if still using only
82 extern unsigned long avenrun
[]; /* Load averages */
84 #define FSHIFT 11 /* nr of bits of precision */
85 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
86 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
87 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
88 #define EXP_5 2014 /* 1/exp(5sec/5min) */
89 #define EXP_15 2037 /* 1/exp(5sec/15min) */
91 #define CALC_LOAD(load,exp,n) \
93 load += n*(FIXED_1-exp); \
96 extern unsigned long total_forks
;
97 extern int nr_threads
;
99 DECLARE_PER_CPU(unsigned long, process_counts
);
100 extern int nr_processes(void);
101 extern unsigned long nr_running(void);
102 extern unsigned long nr_uninterruptible(void);
103 extern unsigned long nr_iowait(void);
105 #include <linux/time.h>
106 #include <linux/param.h>
107 #include <linux/resource.h>
108 #include <linux/timer.h>
109 #include <linux/hrtimer.h>
111 #include <asm/processor.h>
114 * Task state bitmask. NOTE! These bits are also
115 * encoded in fs/proc/array.c: get_task_state().
117 * We have two separate sets of flags: task->state
118 * is about runnability, while task->exit_state are
119 * about the task exiting. Confusing, but this way
120 * modifying one set can't modify the other one by
123 #define TASK_RUNNING 0
124 #define TASK_INTERRUPTIBLE 1
125 #define TASK_UNINTERRUPTIBLE 2
126 #define TASK_STOPPED 4
127 #define TASK_TRACED 8
128 /* in tsk->exit_state */
129 #define EXIT_ZOMBIE 16
131 /* in tsk->state again */
132 #define TASK_NONINTERACTIVE 64
134 #define __set_task_state(tsk, state_value) \
135 do { (tsk)->state = (state_value); } while (0)
136 #define set_task_state(tsk, state_value) \
137 set_mb((tsk)->state, (state_value))
140 * set_current_state() includes a barrier so that the write of current->state
141 * is correctly serialised wrt the caller's subsequent test of whether to
144 * set_current_state(TASK_UNINTERRUPTIBLE);
145 * if (do_i_need_to_sleep())
148 * If the caller does not need such serialisation then use __set_current_state()
150 #define __set_current_state(state_value) \
151 do { current->state = (state_value); } while (0)
152 #define set_current_state(state_value) \
153 set_mb(current->state, (state_value))
155 /* Task command name length */
156 #define TASK_COMM_LEN 16
159 * Scheduling policies
161 #define SCHED_NORMAL 0
164 #define SCHED_BATCH 3
172 #include <linux/spinlock.h>
175 * This serializes "schedule()" and also protects
176 * the run-queue from deletions/modifications (but
177 * _adding_ to the beginning of the run-queue has
180 extern rwlock_t tasklist_lock
;
181 extern spinlock_t mmlist_lock
;
183 typedef struct task_struct task_t
;
185 extern void sched_init(void);
186 extern void sched_init_smp(void);
187 extern void init_idle(task_t
*idle
, int cpu
);
189 extern cpumask_t nohz_cpu_mask
;
191 extern void show_state(void);
192 extern void show_regs(struct pt_regs
*);
195 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
196 * task), SP is the stack pointer of the first frame that should be shown in the back
197 * trace (or NULL if the entire call-chain of the task should be shown).
199 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
201 void io_schedule(void);
202 long io_schedule_timeout(long timeout
);
204 extern void cpu_init (void);
205 extern void trap_init(void);
206 extern void update_process_times(int user
);
207 extern void scheduler_tick(void);
209 #ifdef CONFIG_DETECT_SOFTLOCKUP
210 extern void softlockup_tick(void);
211 extern void spawn_softlockup_task(void);
212 extern void touch_softlockup_watchdog(void);
214 static inline void softlockup_tick(void)
217 static inline void spawn_softlockup_task(void)
220 static inline void touch_softlockup_watchdog(void)
226 /* Attach to any functions which should be ignored in wchan output. */
227 #define __sched __attribute__((__section__(".sched.text")))
228 /* Is this address in the __sched functions? */
229 extern int in_sched_functions(unsigned long addr
);
231 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
232 extern signed long FASTCALL(schedule_timeout(signed long timeout
));
233 extern signed long schedule_timeout_interruptible(signed long timeout
);
234 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
235 asmlinkage
void schedule(void);
239 /* Maximum number of active map areas.. This is a random (large) number */
240 #define DEFAULT_MAX_MAP_COUNT 65536
242 extern int sysctl_max_map_count
;
244 #include <linux/aio.h>
247 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
248 unsigned long, unsigned long);
250 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
251 unsigned long len
, unsigned long pgoff
,
252 unsigned long flags
);
253 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
254 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
256 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
258 * The mm counters are not protected by its page_table_lock,
259 * so must be incremented atomically.
261 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
262 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
263 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
264 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
265 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
266 typedef atomic_long_t mm_counter_t
;
268 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
270 * The mm counters are protected by its page_table_lock,
271 * so can be incremented directly.
273 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
274 #define get_mm_counter(mm, member) ((mm)->_##member)
275 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
276 #define inc_mm_counter(mm, member) (mm)->_##member++
277 #define dec_mm_counter(mm, member) (mm)->_##member--
278 typedef unsigned long mm_counter_t
;
280 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
282 #define get_mm_rss(mm) \
283 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
284 #define update_hiwater_rss(mm) do { \
285 unsigned long _rss = get_mm_rss(mm); \
286 if ((mm)->hiwater_rss < _rss) \
287 (mm)->hiwater_rss = _rss; \
289 #define update_hiwater_vm(mm) do { \
290 if ((mm)->hiwater_vm < (mm)->total_vm) \
291 (mm)->hiwater_vm = (mm)->total_vm; \
295 struct vm_area_struct
* mmap
; /* list of VMAs */
296 struct rb_root mm_rb
;
297 struct vm_area_struct
* mmap_cache
; /* last find_vma result */
298 unsigned long (*get_unmapped_area
) (struct file
*filp
,
299 unsigned long addr
, unsigned long len
,
300 unsigned long pgoff
, unsigned long flags
);
301 void (*unmap_area
) (struct mm_struct
*mm
, unsigned long addr
);
302 unsigned long mmap_base
; /* base of mmap area */
303 unsigned long task_size
; /* size of task vm space */
304 unsigned long cached_hole_size
; /* if non-zero, the largest hole below free_area_cache */
305 unsigned long free_area_cache
; /* first hole of size cached_hole_size or larger */
307 atomic_t mm_users
; /* How many users with user space? */
308 atomic_t mm_count
; /* How many references to "struct mm_struct" (users count as 1) */
309 int map_count
; /* number of VMAs */
310 struct rw_semaphore mmap_sem
;
311 spinlock_t page_table_lock
; /* Protects page tables and some counters */
313 struct list_head mmlist
; /* List of maybe swapped mm's. These are globally strung
314 * together off init_mm.mmlist, and are protected
318 /* Special counters, in some configurations protected by the
319 * page_table_lock, in other configurations by being atomic.
321 mm_counter_t _file_rss
;
322 mm_counter_t _anon_rss
;
324 unsigned long hiwater_rss
; /* High-watermark of RSS usage */
325 unsigned long hiwater_vm
; /* High-water virtual memory usage */
327 unsigned long total_vm
, locked_vm
, shared_vm
, exec_vm
;
328 unsigned long stack_vm
, reserved_vm
, def_flags
, nr_ptes
;
329 unsigned long start_code
, end_code
, start_data
, end_data
;
330 unsigned long start_brk
, brk
, start_stack
;
331 unsigned long arg_start
, arg_end
, env_start
, env_end
;
333 unsigned long saved_auxv
[AT_VECTOR_SIZE
]; /* for /proc/PID/auxv */
336 cpumask_t cpu_vm_mask
;
338 /* Architecture-specific MM context */
339 mm_context_t context
;
341 /* Token based thrashing protection. */
342 unsigned long swap_token_time
;
345 /* coredumping support */
347 struct completion
*core_startup_done
, core_done
;
350 rwlock_t ioctx_list_lock
;
351 struct kioctx
*ioctx_list
;
354 struct sighand_struct
{
356 struct k_sigaction action
[_NSIG
];
361 extern void sighand_free_cb(struct rcu_head
*rhp
);
363 static inline void sighand_free(struct sighand_struct
*sp
)
365 call_rcu(&sp
->rcu
, sighand_free_cb
);
369 * NOTE! "signal_struct" does not have it's own
370 * locking, because a shared signal_struct always
371 * implies a shared sighand_struct, so locking
372 * sighand_struct is always a proper superset of
373 * the locking of signal_struct.
375 struct signal_struct
{
379 wait_queue_head_t wait_chldexit
; /* for wait4() */
381 /* current thread group signal load-balancing target: */
384 /* shared signal handling: */
385 struct sigpending shared_pending
;
387 /* thread group exit support */
390 * - notify group_exit_task when ->count is equal to notify_count
391 * - everyone except group_exit_task is stopped during signal delivery
392 * of fatal signals, group_exit_task processes the signal.
394 struct task_struct
*group_exit_task
;
397 /* thread group stop support, overloads group_exit_code too */
398 int group_stop_count
;
399 unsigned int flags
; /* see SIGNAL_* flags below */
401 /* POSIX.1b Interval Timers */
402 struct list_head posix_timers
;
404 /* ITIMER_REAL timer for the process */
405 struct hrtimer real_timer
;
406 struct task_struct
*tsk
;
407 ktime_t it_real_incr
;
409 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
410 cputime_t it_prof_expires
, it_virt_expires
;
411 cputime_t it_prof_incr
, it_virt_incr
;
413 /* job control IDs */
417 /* boolean value for session group leader */
420 struct tty_struct
*tty
; /* NULL if no tty */
423 * Cumulative resource counters for dead threads in the group,
424 * and for reaped dead child processes forked by this group.
425 * Live threads maintain their own counters and add to these
426 * in __exit_signal, except for the group leader.
428 cputime_t utime
, stime
, cutime
, cstime
;
429 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
430 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
433 * Cumulative ns of scheduled CPU time for dead threads in the
434 * group, not including a zombie group leader. (This only differs
435 * from jiffies_to_ns(utime + stime) if sched_clock uses something
436 * other than jiffies.)
438 unsigned long long sched_time
;
441 * We don't bother to synchronize most readers of this at all,
442 * because there is no reader checking a limit that actually needs
443 * to get both rlim_cur and rlim_max atomically, and either one
444 * alone is a single word that can safely be read normally.
445 * getrlimit/setrlimit use task_lock(current->group_leader) to
446 * protect this instead of the siglock, because they really
447 * have no need to disable irqs.
449 struct rlimit rlim
[RLIM_NLIMITS
];
451 struct list_head cpu_timers
[3];
453 /* keep the process-shared keyrings here so that they do the right
454 * thing in threads created with CLONE_THREAD */
456 struct key
*session_keyring
; /* keyring inherited over fork */
457 struct key
*process_keyring
; /* keyring private to this process */
461 /* Context switch must be unlocked if interrupts are to be enabled */
462 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
463 # define __ARCH_WANT_UNLOCKED_CTXSW
467 * Bits in flags field of signal_struct.
469 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
470 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
471 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
472 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
476 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
477 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
478 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
479 * values are inverted: lower p->prio value means higher priority.
481 * The MAX_USER_RT_PRIO value allows the actual maximum
482 * RT priority to be separate from the value exported to
483 * user-space. This allows kernel threads to set their
484 * priority to a value higher than any user task. Note:
485 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
488 #define MAX_USER_RT_PRIO 100
489 #define MAX_RT_PRIO MAX_USER_RT_PRIO
491 #define MAX_PRIO (MAX_RT_PRIO + 40)
493 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
496 * Some day this will be a full-fledged user tracking system..
499 atomic_t __count
; /* reference count */
500 atomic_t processes
; /* How many processes does this user have? */
501 atomic_t files
; /* How many open files does this user have? */
502 atomic_t sigpending
; /* How many pending signals does this user have? */
503 #ifdef CONFIG_INOTIFY
504 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
505 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
507 /* protected by mq_lock */
508 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
509 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
512 struct key
*uid_keyring
; /* UID specific keyring */
513 struct key
*session_keyring
; /* UID's default session keyring */
516 /* Hash table maintenance information */
517 struct list_head uidhash_list
;
521 extern struct user_struct
*find_user(uid_t
);
523 extern struct user_struct root_user
;
524 #define INIT_USER (&root_user)
526 typedef struct prio_array prio_array_t
;
527 struct backing_dev_info
;
528 struct reclaim_state
;
530 #ifdef CONFIG_SCHEDSTATS
532 /* cumulative counters */
533 unsigned long cpu_time
, /* time spent on the cpu */
534 run_delay
, /* time spent waiting on a runqueue */
535 pcnt
; /* # of timeslices run on this cpu */
538 unsigned long last_arrival
, /* when we last ran on a cpu */
539 last_queued
; /* when we were last queued to run */
542 extern struct file_operations proc_schedstat_operations
;
554 * sched-domains (multiprocessor balancing) declarations:
557 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
559 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
560 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
561 #define SD_BALANCE_EXEC 4 /* Balance on exec */
562 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
563 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
564 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
565 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
566 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
569 struct sched_group
*next
; /* Must be a circular list */
573 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
574 * single CPU. This is read only (except for setup, hotplug CPU).
576 unsigned long cpu_power
;
579 struct sched_domain
{
580 /* These fields must be setup */
581 struct sched_domain
*parent
; /* top domain must be null terminated */
582 struct sched_group
*groups
; /* the balancing groups of the domain */
583 cpumask_t span
; /* span of all CPUs in this domain */
584 unsigned long min_interval
; /* Minimum balance interval ms */
585 unsigned long max_interval
; /* Maximum balance interval ms */
586 unsigned int busy_factor
; /* less balancing by factor if busy */
587 unsigned int imbalance_pct
; /* No balance until over watermark */
588 unsigned long long cache_hot_time
; /* Task considered cache hot (ns) */
589 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
590 unsigned int per_cpu_gain
; /* CPU % gained by adding domain cpus */
591 unsigned int busy_idx
;
592 unsigned int idle_idx
;
593 unsigned int newidle_idx
;
594 unsigned int wake_idx
;
595 unsigned int forkexec_idx
;
596 int flags
; /* See SD_* */
598 /* Runtime fields. */
599 unsigned long last_balance
; /* init to jiffies. units in jiffies */
600 unsigned int balance_interval
; /* initialise to 1. units in ms. */
601 unsigned int nr_balance_failed
; /* initialise to 0 */
603 #ifdef CONFIG_SCHEDSTATS
604 /* load_balance() stats */
605 unsigned long lb_cnt
[MAX_IDLE_TYPES
];
606 unsigned long lb_failed
[MAX_IDLE_TYPES
];
607 unsigned long lb_balanced
[MAX_IDLE_TYPES
];
608 unsigned long lb_imbalance
[MAX_IDLE_TYPES
];
609 unsigned long lb_gained
[MAX_IDLE_TYPES
];
610 unsigned long lb_hot_gained
[MAX_IDLE_TYPES
];
611 unsigned long lb_nobusyg
[MAX_IDLE_TYPES
];
612 unsigned long lb_nobusyq
[MAX_IDLE_TYPES
];
614 /* Active load balancing */
615 unsigned long alb_cnt
;
616 unsigned long alb_failed
;
617 unsigned long alb_pushed
;
619 /* SD_BALANCE_EXEC stats */
620 unsigned long sbe_cnt
;
621 unsigned long sbe_balanced
;
622 unsigned long sbe_pushed
;
624 /* SD_BALANCE_FORK stats */
625 unsigned long sbf_cnt
;
626 unsigned long sbf_balanced
;
627 unsigned long sbf_pushed
;
629 /* try_to_wake_up() stats */
630 unsigned long ttwu_wake_remote
;
631 unsigned long ttwu_move_affine
;
632 unsigned long ttwu_move_balance
;
636 extern void partition_sched_domains(cpumask_t
*partition1
,
637 cpumask_t
*partition2
);
640 * Maximum cache size the migration-costs auto-tuning code will
643 extern unsigned int max_cache_size
;
645 #endif /* CONFIG_SMP */
648 struct io_context
; /* See blkdev.h */
649 void exit_io_context(void);
652 #define NGROUPS_SMALL 32
653 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
657 gid_t small_block
[NGROUPS_SMALL
];
663 * get_group_info() must be called with the owning task locked (via task_lock())
664 * when task != current. The reason being that the vast majority of callers are
665 * looking at current->group_info, which can not be changed except by the
666 * current task. Changing current->group_info requires the task lock, too.
668 #define get_group_info(group_info) do { \
669 atomic_inc(&(group_info)->usage); \
672 #define put_group_info(group_info) do { \
673 if (atomic_dec_and_test(&(group_info)->usage)) \
674 groups_free(group_info); \
677 extern struct group_info
*groups_alloc(int gidsetsize
);
678 extern void groups_free(struct group_info
*group_info
);
679 extern int set_current_groups(struct group_info
*group_info
);
680 extern int groups_search(struct group_info
*group_info
, gid_t grp
);
681 /* access the groups "array" with this macro */
682 #define GROUP_AT(gi, i) \
683 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
685 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
686 extern void prefetch_stack(struct task_struct
*);
688 static inline void prefetch_stack(struct task_struct
*t
) { }
691 struct audit_context
; /* See audit.c */
695 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
696 struct thread_info
*thread_info
;
698 unsigned long flags
; /* per process flags, defined below */
699 unsigned long ptrace
;
701 int lock_depth
; /* BKL lock depth */
703 #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)
706 int prio
, static_prio
;
707 struct list_head run_list
;
710 unsigned short ioprio
;
711 unsigned int btrace_seq
;
713 unsigned long sleep_avg
;
714 unsigned long long timestamp
, last_ran
;
715 unsigned long long sched_time
; /* sched_clock time spent running */
718 unsigned long policy
;
719 cpumask_t cpus_allowed
;
720 unsigned int time_slice
, first_time_slice
;
722 #ifdef CONFIG_SCHEDSTATS
723 struct sched_info sched_info
;
726 struct list_head tasks
;
728 * ptrace_list/ptrace_children forms the list of my children
729 * that were stolen by a ptracer.
731 struct list_head ptrace_children
;
732 struct list_head ptrace_list
;
734 struct mm_struct
*mm
, *active_mm
;
737 struct linux_binfmt
*binfmt
;
739 int exit_code
, exit_signal
;
740 int pdeath_signal
; /* The signal sent when the parent dies */
742 unsigned long personality
;
747 * pointers to (original) parent process, youngest child, younger sibling,
748 * older sibling, respectively. (p->father can be replaced with
751 struct task_struct
*real_parent
; /* real parent process (when being debugged) */
752 struct task_struct
*parent
; /* parent process */
754 * children/sibling forms the list of my children plus the
755 * tasks I'm ptracing.
757 struct list_head children
; /* list of my children */
758 struct list_head sibling
; /* linkage in my parent's children list */
759 struct task_struct
*group_leader
; /* threadgroup leader */
761 /* PID/PID hash table linkage. */
762 struct pid pids
[PIDTYPE_MAX
];
764 struct completion
*vfork_done
; /* for vfork() */
765 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
766 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
768 unsigned long rt_priority
;
769 cputime_t utime
, stime
;
770 unsigned long nvcsw
, nivcsw
; /* context switch counts */
771 struct timespec start_time
;
772 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
773 unsigned long min_flt
, maj_flt
;
775 cputime_t it_prof_expires
, it_virt_expires
;
776 unsigned long long it_sched_expires
;
777 struct list_head cpu_timers
[3];
779 /* process credentials */
780 uid_t uid
,euid
,suid
,fsuid
;
781 gid_t gid
,egid
,sgid
,fsgid
;
782 struct group_info
*group_info
;
783 kernel_cap_t cap_effective
, cap_inheritable
, cap_permitted
;
784 unsigned keep_capabilities
:1;
785 struct user_struct
*user
;
787 struct key
*request_key_auth
; /* assumed request_key authority */
788 struct key
*thread_keyring
; /* keyring private to this thread */
789 unsigned char jit_keyring
; /* default keyring to attach requested keys to */
791 int oomkilladj
; /* OOM kill score adjustment (bit shift). */
792 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
793 - access with [gs]et_task_comm (which lock
795 - initialized normally by flush_old_exec */
796 /* file system info */
797 int link_count
, total_link_count
;
799 struct sysv_sem sysvsem
;
800 /* CPU-specific state of this task */
801 struct thread_struct thread
;
802 /* filesystem information */
803 struct fs_struct
*fs
;
804 /* open file information */
805 struct files_struct
*files
;
807 struct namespace *namespace;
808 /* signal handlers */
809 struct signal_struct
*signal
;
810 struct sighand_struct
*sighand
;
812 sigset_t blocked
, real_blocked
;
813 sigset_t saved_sigmask
; /* To be restored with TIF_RESTORE_SIGMASK */
814 struct sigpending pending
;
816 unsigned long sas_ss_sp
;
818 int (*notifier
)(void *priv
);
820 sigset_t
*notifier_mask
;
823 struct audit_context
*audit_context
;
826 /* Thread group tracking */
829 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
830 spinlock_t alloc_lock
;
831 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
832 spinlock_t proc_lock
;
834 #ifdef CONFIG_DEBUG_MUTEXES
835 /* mutex deadlock detection */
836 struct mutex_waiter
*blocked_on
;
839 /* journalling filesystem info */
843 struct reclaim_state
*reclaim_state
;
845 struct dentry
*proc_dentry
;
846 struct backing_dev_info
*backing_dev_info
;
848 struct io_context
*io_context
;
850 unsigned long ptrace_message
;
851 siginfo_t
*last_siginfo
; /* For ptrace use. */
853 * current io wait handle: wait queue entry to use for io waits
854 * If this thread is processing aio, this points at the waitqueue
855 * inside the currently handled kiocb. It may be NULL (i.e. default
856 * to a stack based synchronous wait) if its doing sync IO.
858 wait_queue_t
*io_wait
;
859 /* i/o counters(bytes read/written, #syscalls */
860 u64 rchar
, wchar
, syscr
, syscw
;
861 #if defined(CONFIG_BSD_PROCESS_ACCT)
862 u64 acct_rss_mem1
; /* accumulated rss usage */
863 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
864 clock_t acct_stimexpd
; /* clock_t-converted stime since last update */
867 struct mempolicy
*mempolicy
;
870 #ifdef CONFIG_CPUSETS
871 struct cpuset
*cpuset
;
872 nodemask_t mems_allowed
;
873 int cpuset_mems_generation
;
874 int cpuset_mem_spread_rotor
;
876 struct robust_list_head __user
*robust_list
;
878 struct compat_robust_list_head __user
*compat_robust_list
;
881 atomic_t fs_excl
; /* holding fs exclusive resources */
885 static inline pid_t
process_group(struct task_struct
*tsk
)
887 return tsk
->signal
->pgrp
;
891 * pid_alive - check that a task structure is not stale
892 * @p: Task structure to be checked.
894 * Test if a process is not yet dead (at most zombie state)
895 * If pid_alive fails, then pointers within the task structure
896 * can be stale and must not be dereferenced.
898 static inline int pid_alive(struct task_struct
*p
)
900 return p
->pids
[PIDTYPE_PID
].nr
!= 0;
903 extern void free_task(struct task_struct
*tsk
);
904 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
906 extern void __put_task_struct_cb(struct rcu_head
*rhp
);
908 static inline void put_task_struct(struct task_struct
*t
)
910 if (atomic_dec_and_test(&t
->usage
))
911 call_rcu(&t
->rcu
, __put_task_struct_cb
);
917 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
918 /* Not implemented yet, only for 486*/
919 #define PF_STARTING 0x00000002 /* being created */
920 #define PF_EXITING 0x00000004 /* getting shut down */
921 #define PF_DEAD 0x00000008 /* Dead */
922 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
923 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
924 #define PF_DUMPCORE 0x00000200 /* dumped core */
925 #define PF_SIGNALED 0x00000400 /* killed by a signal */
926 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
927 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
928 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
929 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
930 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
931 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
932 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
933 #define PF_KSWAPD 0x00040000 /* I am kswapd */
934 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
935 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
936 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
937 #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */
938 #define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */
939 #define PF_SWAPWRITE 0x01000000 /* Allowed to write to swap */
940 #define PF_SPREAD_PAGE 0x04000000 /* Spread page cache over cpuset */
941 #define PF_SPREAD_SLAB 0x08000000 /* Spread some slab caches over cpuset */
942 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
945 * Only the _current_ task can read/write to tsk->flags, but other
946 * tasks can access tsk->flags in readonly mode for example
947 * with tsk_used_math (like during threaded core dumping).
948 * There is however an exception to this rule during ptrace
949 * or during fork: the ptracer task is allowed to write to the
950 * child->flags of its traced child (same goes for fork, the parent
951 * can write to the child->flags), because we're guaranteed the
952 * child is not running and in turn not changing child->flags
953 * at the same time the parent does it.
955 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
956 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
957 #define clear_used_math() clear_stopped_child_used_math(current)
958 #define set_used_math() set_stopped_child_used_math(current)
959 #define conditional_stopped_child_used_math(condition, child) \
960 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
961 #define conditional_used_math(condition) \
962 conditional_stopped_child_used_math(condition, current)
963 #define copy_to_stopped_child_used_math(child) \
964 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
965 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
966 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
967 #define used_math() tsk_used_math(current)
970 extern int set_cpus_allowed(task_t
*p
, cpumask_t new_mask
);
972 static inline int set_cpus_allowed(task_t
*p
, cpumask_t new_mask
)
974 if (!cpu_isset(0, new_mask
))
980 extern unsigned long long sched_clock(void);
981 extern unsigned long long current_sched_time(const task_t
*current_task
);
983 /* sched_exec is called by processes performing an exec */
985 extern void sched_exec(void);
987 #define sched_exec() {}
990 #ifdef CONFIG_HOTPLUG_CPU
991 extern void idle_task_exit(void);
993 static inline void idle_task_exit(void) {}
996 extern void sched_idle_next(void);
997 extern void set_user_nice(task_t
*p
, long nice
);
998 extern int task_prio(const task_t
*p
);
999 extern int task_nice(const task_t
*p
);
1000 extern int can_nice(const task_t
*p
, const int nice
);
1001 extern int task_curr(const task_t
*p
);
1002 extern int idle_cpu(int cpu
);
1003 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1004 extern task_t
*idle_task(int cpu
);
1005 extern task_t
*curr_task(int cpu
);
1006 extern void set_curr_task(int cpu
, task_t
*p
);
1011 * The default (Linux) execution domain.
1013 extern struct exec_domain default_exec_domain
;
1015 union thread_union
{
1016 struct thread_info thread_info
;
1017 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1020 #ifndef __HAVE_ARCH_KSTACK_END
1021 static inline int kstack_end(void *addr
)
1023 /* Reliable end of stack detection:
1024 * Some APM bios versions misalign the stack
1026 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1030 extern union thread_union init_thread_union
;
1031 extern struct task_struct init_task
;
1033 extern struct mm_struct init_mm
;
1035 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1036 extern struct task_struct
*find_task_by_pid_type(int type
, int pid
);
1037 extern void set_special_pids(pid_t session
, pid_t pgrp
);
1038 extern void __set_special_pids(pid_t session
, pid_t pgrp
);
1040 /* per-UID process charging. */
1041 extern struct user_struct
* alloc_uid(uid_t
);
1042 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1044 atomic_inc(&u
->__count
);
1047 extern void free_uid(struct user_struct
*);
1048 extern void switch_uid(struct user_struct
*);
1050 #include <asm/current.h>
1052 extern void do_timer(struct pt_regs
*);
1054 extern int FASTCALL(wake_up_state(struct task_struct
* tsk
, unsigned int state
));
1055 extern int FASTCALL(wake_up_process(struct task_struct
* tsk
));
1056 extern void FASTCALL(wake_up_new_task(struct task_struct
* tsk
,
1057 unsigned long clone_flags
));
1059 extern void kick_process(struct task_struct
*tsk
);
1061 static inline void kick_process(struct task_struct
*tsk
) { }
1063 extern void FASTCALL(sched_fork(task_t
* p
, int clone_flags
));
1064 extern void FASTCALL(sched_exit(task_t
* p
));
1066 extern int in_group_p(gid_t
);
1067 extern int in_egroup_p(gid_t
);
1069 extern void proc_caches_init(void);
1070 extern void flush_signals(struct task_struct
*);
1071 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1072 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1074 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1076 unsigned long flags
;
1079 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1080 ret
= dequeue_signal(tsk
, mask
, info
);
1081 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1086 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1088 extern void unblock_all_signals(void);
1089 extern void release_task(struct task_struct
* p
);
1090 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1091 extern int send_group_sig_info(int, struct siginfo
*, struct task_struct
*);
1092 extern int force_sigsegv(int, struct task_struct
*);
1093 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1094 extern int __kill_pg_info(int sig
, struct siginfo
*info
, pid_t pgrp
);
1095 extern int kill_pg_info(int, struct siginfo
*, pid_t
);
1096 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1097 extern int kill_proc_info_as_uid(int, struct siginfo
*, pid_t
, uid_t
, uid_t
);
1098 extern void do_notify_parent(struct task_struct
*, int);
1099 extern void force_sig(int, struct task_struct
*);
1100 extern void force_sig_specific(int, struct task_struct
*);
1101 extern int send_sig(int, struct task_struct
*, int);
1102 extern void zap_other_threads(struct task_struct
*p
);
1103 extern int kill_pg(pid_t
, int, int);
1104 extern int kill_sl(pid_t
, int, int);
1105 extern int kill_proc(pid_t
, int, int);
1106 extern struct sigqueue
*sigqueue_alloc(void);
1107 extern void sigqueue_free(struct sigqueue
*);
1108 extern int send_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1109 extern int send_group_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1110 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1111 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1113 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1114 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1115 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1116 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1118 static inline int is_si_special(const struct siginfo
*info
)
1120 return info
<= SEND_SIG_FORCED
;
1123 /* True if we are on the alternate signal stack. */
1125 static inline int on_sig_stack(unsigned long sp
)
1127 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1130 static inline int sas_ss_flags(unsigned long sp
)
1132 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1133 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1137 * Routines for handling mm_structs
1139 extern struct mm_struct
* mm_alloc(void);
1141 /* mmdrop drops the mm and the page tables */
1142 extern void FASTCALL(__mmdrop(struct mm_struct
*));
1143 static inline void mmdrop(struct mm_struct
* mm
)
1145 if (atomic_dec_and_test(&mm
->mm_count
))
1149 /* mmput gets rid of the mappings and all user-space */
1150 extern void mmput(struct mm_struct
*);
1151 /* Grab a reference to a task's mm, if it is not already going away */
1152 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1153 /* Remove the current tasks stale references to the old mm_struct */
1154 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1156 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1157 extern void flush_thread(void);
1158 extern void exit_thread(void);
1160 extern void exit_files(struct task_struct
*);
1161 extern void exit_signal(struct task_struct
*);
1162 extern void __exit_signal(struct task_struct
*);
1163 extern void exit_sighand(struct task_struct
*);
1164 extern void __exit_sighand(struct task_struct
*);
1165 extern void exit_itimers(struct signal_struct
*);
1167 extern NORET_TYPE
void do_group_exit(int);
1169 extern void daemonize(const char *, ...);
1170 extern int allow_signal(int);
1171 extern int disallow_signal(int);
1172 extern task_t
*child_reaper
;
1174 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1175 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1176 task_t
*fork_idle(int);
1178 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1179 extern void get_task_comm(char *to
, struct task_struct
*tsk
);
1182 extern void wait_task_inactive(task_t
* p
);
1184 #define wait_task_inactive(p) do { } while (0)
1187 #define remove_parent(p) list_del_init(&(p)->sibling)
1188 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
1190 #define REMOVE_LINKS(p) do { \
1191 if (thread_group_leader(p)) \
1192 list_del_init(&(p)->tasks); \
1196 #define SET_LINKS(p) do { \
1197 if (thread_group_leader(p)) \
1198 list_add_tail(&(p)->tasks,&init_task.tasks); \
1199 add_parent(p, (p)->parent); \
1202 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
1203 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
1205 #define for_each_process(p) \
1206 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1209 * Careful: do_each_thread/while_each_thread is a double loop so
1210 * 'break' will not work as expected - use goto instead.
1212 #define do_each_thread(g, t) \
1213 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1215 #define while_each_thread(g, t) \
1216 while ((t = next_thread(t)) != g)
1218 extern task_t
* FASTCALL(next_thread(const task_t
*p
));
1220 #define thread_group_leader(p) (p->pid == p->tgid)
1222 static inline int thread_group_empty(task_t
*p
)
1224 return list_empty(&p
->pids
[PIDTYPE_TGID
].pid_list
);
1227 #define delay_group_leader(p) \
1228 (thread_group_leader(p) && !thread_group_empty(p))
1230 extern void unhash_process(struct task_struct
*p
);
1233 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring
1234 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1235 * pins the final release of task.io_context. Also protects ->cpuset.
1237 * Nests both inside and outside of read_lock(&tasklist_lock).
1238 * It must not be nested with write_lock_irq(&tasklist_lock),
1239 * neither inside nor outside.
1241 static inline void task_lock(struct task_struct
*p
)
1243 spin_lock(&p
->alloc_lock
);
1246 static inline void task_unlock(struct task_struct
*p
)
1248 spin_unlock(&p
->alloc_lock
);
1251 #ifndef __HAVE_THREAD_FUNCTIONS
1253 #define task_thread_info(task) (task)->thread_info
1254 #define task_stack_page(task) ((void*)((task)->thread_info))
1256 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
1258 *task_thread_info(p
) = *task_thread_info(org
);
1259 task_thread_info(p
)->task
= p
;
1262 static inline unsigned long *end_of_stack(struct task_struct
*p
)
1264 return (unsigned long *)(p
->thread_info
+ 1);
1269 /* set thread flags in other task's structures
1270 * - see asm/thread_info.h for TIF_xxxx flags available
1272 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1274 set_ti_thread_flag(task_thread_info(tsk
), flag
);
1277 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1279 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1282 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1284 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
1287 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1289 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1292 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1294 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
1297 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
1299 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1302 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
1304 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1307 static inline int signal_pending(struct task_struct
*p
)
1309 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
1312 static inline int need_resched(void)
1314 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
1318 * cond_resched() and cond_resched_lock(): latency reduction via
1319 * explicit rescheduling in places that are safe. The return
1320 * value indicates whether a reschedule was done in fact.
1321 * cond_resched_lock() will drop the spinlock before scheduling,
1322 * cond_resched_softirq() will enable bhs before scheduling.
1324 extern int cond_resched(void);
1325 extern int cond_resched_lock(spinlock_t
* lock
);
1326 extern int cond_resched_softirq(void);
1329 * Does a critical section need to be broken due to another
1332 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1333 # define need_lockbreak(lock) ((lock)->break_lock)
1335 # define need_lockbreak(lock) 0
1339 * Does a critical section need to be broken due to another
1340 * task waiting or preemption being signalled:
1342 static inline int lock_need_resched(spinlock_t
*lock
)
1344 if (need_lockbreak(lock
) || need_resched())
1349 /* Reevaluate whether the task has signals pending delivery.
1350 This is required every time the blocked sigset_t changes.
1351 callers must hold sighand->siglock. */
1353 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct
*t
));
1354 extern void recalc_sigpending(void);
1356 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
1359 * Wrappers for p->thread_info->cpu access. No-op on UP.
1363 static inline unsigned int task_cpu(const struct task_struct
*p
)
1365 return task_thread_info(p
)->cpu
;
1368 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1370 task_thread_info(p
)->cpu
= cpu
;
1375 static inline unsigned int task_cpu(const struct task_struct
*p
)
1380 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1384 #endif /* CONFIG_SMP */
1386 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1387 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
1389 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
)
1391 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
1392 mm
->get_unmapped_area
= arch_get_unmapped_area
;
1393 mm
->unmap_area
= arch_unmap_area
;
1397 extern long sched_setaffinity(pid_t pid
, cpumask_t new_mask
);
1398 extern long sched_getaffinity(pid_t pid
, cpumask_t
*mask
);
1400 extern void normalize_rt_tasks(void);
1404 * Check if a process has been frozen
1406 static inline int frozen(struct task_struct
*p
)
1408 return p
->flags
& PF_FROZEN
;
1412 * Check if there is a request to freeze a process
1414 static inline int freezing(struct task_struct
*p
)
1416 return p
->flags
& PF_FREEZE
;
1420 * Request that a process be frozen
1421 * FIXME: SMP problem. We may not modify other process' flags!
1423 static inline void freeze(struct task_struct
*p
)
1425 p
->flags
|= PF_FREEZE
;
1429 * Wake up a frozen process
1431 static inline int thaw_process(struct task_struct
*p
)
1434 p
->flags
&= ~PF_FROZEN
;
1442 * freezing is complete, mark process as frozen
1444 static inline void frozen_process(struct task_struct
*p
)
1446 p
->flags
= (p
->flags
& ~PF_FREEZE
) | PF_FROZEN
;
1449 extern void refrigerator(void);
1450 extern int freeze_processes(void);
1451 extern void thaw_processes(void);
1453 static inline int try_to_freeze(void)
1455 if (freezing(current
)) {
1462 static inline int frozen(struct task_struct
*p
) { return 0; }
1463 static inline int freezing(struct task_struct
*p
) { return 0; }
1464 static inline void freeze(struct task_struct
*p
) { BUG(); }
1465 static inline int thaw_process(struct task_struct
*p
) { return 1; }
1466 static inline void frozen_process(struct task_struct
*p
) { BUG(); }
1468 static inline void refrigerator(void) {}
1469 static inline int freeze_processes(void) { BUG(); return 0; }
1470 static inline void thaw_processes(void) {}
1472 static inline int try_to_freeze(void) { return 0; }
1474 #endif /* CONFIG_PM */
1475 #endif /* __KERNEL__ */