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>
16 #include <asm/system.h>
17 #include <asm/semaphore.h>
19 #include <asm/ptrace.h>
22 #include <linux/smp.h>
23 #include <linux/sem.h>
24 #include <linux/signal.h>
25 #include <linux/securebits.h>
26 #include <linux/fs_struct.h>
27 #include <linux/compiler.h>
28 #include <linux/completion.h>
29 #include <linux/pid.h>
30 #include <linux/percpu.h>
37 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
38 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
39 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
40 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
41 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
42 #define CLONE_IDLETASK 0x00001000 /* set if new pid should be 0 (kernel only)*/
43 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
44 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
45 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
46 #define CLONE_THREAD 0x00010000 /* Same thread group? */
47 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
48 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
49 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
50 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
51 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
52 #define CLONE_DETACHED 0x00400000 /* parent wants no child-exit signal */
53 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
54 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
57 * List of flags we want to share for kernel threads,
58 * if only because they are not used by them anyway.
60 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
63 * These are the constant used to fake the fixed-point load-average
64 * counting. Some notes:
65 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
66 * a load-average precision of 10 bits integer + 11 bits fractional
67 * - if you want to count load-averages more often, you need more
68 * precision, or rounding will get you. With 2-second counting freq,
69 * the EXP_n values would be 1981, 2034 and 2043 if still using only
72 extern unsigned long avenrun[]; /* Load averages */
74 #define FSHIFT 11 /* nr of bits of precision */
75 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
76 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
77 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
78 #define EXP_5 2014 /* 1/exp(5sec/5min) */
79 #define EXP_15 2037 /* 1/exp(5sec/15min) */
81 #define CALC_LOAD(load,exp,n) \
83 load += n*(FIXED_1-exp); \
86 #define CT_TO_SECS(x) ((x) / HZ)
87 #define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ)
89 extern int nr_threads;
91 DECLARE_PER_CPU(unsigned long, process_counts);
92 extern int nr_processes(void);
93 extern unsigned long nr_running(void);
94 extern unsigned long nr_uninterruptible(void);
95 extern unsigned long nr_iowait(void);
97 #include <linux/time.h>
98 #include <linux/param.h>
99 #include <linux/resource.h>
100 #include <linux/timer.h>
102 #include <asm/processor.h>
104 #define TASK_RUNNING 0
105 #define TASK_INTERRUPTIBLE 1
106 #define TASK_UNINTERRUPTIBLE 2
107 #define TASK_STOPPED 4
108 #define TASK_ZOMBIE 8
111 #define __set_task_state(tsk, state_value) \
112 do { (tsk)->state = (state_value); } while (0)
113 #define set_task_state(tsk, state_value) \
114 set_mb((tsk)->state, (state_value))
116 #define __set_current_state(state_value) \
117 do { current->state = (state_value); } while (0)
118 #define set_current_state(state_value) \
119 set_mb(current->state, (state_value))
122 * Scheduling policies
124 #define SCHED_NORMAL 0
134 #include <linux/spinlock.h>
137 * This serializes "schedule()" and also protects
138 * the run-queue from deletions/modifications (but
139 * _adding_ to the beginning of the run-queue has
142 extern rwlock_t tasklist_lock;
143 extern spinlock_t mmlist_lock;
145 typedef struct task_struct task_t;
147 extern void sched_init(void);
148 extern void init_idle(task_t *idle, int cpu);
150 extern void show_state(void);
151 extern void show_trace(unsigned long *stack);
152 extern void show_stack(unsigned long *stack);
153 extern void show_regs(struct pt_regs *);
155 void io_schedule(void);
156 long io_schedule_timeout(long timeout);
158 extern void cpu_init (void);
159 extern void trap_init(void);
160 extern void update_process_times(int user);
161 extern void update_one_process(struct task_struct *p, unsigned long user,
162 unsigned long system, int cpu);
163 extern void scheduler_tick(int user_tick, int system);
164 extern unsigned long cache_decay_ticks;
167 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
168 extern signed long FASTCALL(schedule_timeout(signed long timeout));
169 asmlinkage void schedule(void);
173 /* Maximum number of active map areas.. This is a random (large) number */
174 #define MAX_MAP_COUNT (65536)
176 #include <linux/aio.h>
179 struct vm_area_struct * mmap; /* list of VMAs */
180 struct rb_root mm_rb;
181 struct vm_area_struct * mmap_cache; /* last find_vma result */
182 unsigned long free_area_cache; /* first hole */
184 atomic_t mm_users; /* How many users with user space? */
185 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
186 int map_count; /* number of VMAs */
187 struct rw_semaphore mmap_sem;
188 spinlock_t page_table_lock; /* Protects task page tables and mm->rss */
190 struct list_head mmlist; /* List of all active mm's. These are globally strung
191 * together off init_mm.mmlist, and are protected
195 unsigned long start_code, end_code, start_data, end_data;
196 unsigned long start_brk, brk, start_stack;
197 unsigned long arg_start, arg_end, env_start, env_end;
198 unsigned long rss, total_vm, locked_vm;
199 unsigned long def_flags;
200 unsigned long cpu_vm_mask;
201 unsigned long swap_address;
204 #ifdef CONFIG_HUGETLB_PAGE
207 /* Architecture-specific MM context */
208 mm_context_t context;
210 /* coredumping support */
212 struct completion *core_startup_done, core_done;
215 rwlock_t ioctx_list_lock;
216 struct kioctx *ioctx_list;
218 struct kioctx default_kioctx;
221 extern int mmlist_nr;
223 struct sighand_struct {
225 struct k_sigaction action[_NSIG];
230 * NOTE! "signal_struct" does not have it's own
231 * locking, because a shared signal_struct always
232 * implies a shared sighand_struct, so locking
233 * sighand_struct is always a proper superset of
234 * the locking of signal_struct.
236 struct signal_struct {
239 /* current thread group signal load-balancing target: */
242 /* shared signal handling: */
243 struct sigpending shared_pending;
245 /* thread group exit support */
248 struct task_struct *group_exit_task;
250 /* thread group stop support, overloads group_exit_code too */
251 int group_stop_count;
255 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
256 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
257 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
258 * are inverted: lower p->prio value means higher priority.
260 * The MAX_RT_USER_PRIO value allows the actual maximum
261 * RT priority to be separate from the value exported to
262 * user-space. This allows kernel threads to set their
263 * priority to a value higher than any user task. Note:
264 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
267 #define MAX_USER_RT_PRIO 100
268 #define MAX_RT_PRIO MAX_USER_RT_PRIO
270 #define MAX_PRIO (MAX_RT_PRIO + 40)
273 * Some day this will be a full-fledged user tracking system..
276 atomic_t __count; /* reference count */
277 atomic_t processes; /* How many processes does this user have? */
278 atomic_t files; /* How many open files does this user have? */
280 /* Hash table maintenance information */
281 struct list_head uidhash_list;
285 #define get_current_user() ({ \
286 struct user_struct *__user = current->user; \
287 atomic_inc(&__user->__count); \
290 extern struct user_struct *find_user(uid_t);
292 extern struct user_struct root_user;
293 #define INIT_USER (&root_user)
295 typedef struct prio_array prio_array_t;
296 struct backing_dev_info;
298 /* POSIX.1b interval timer structure. */
300 struct list_head list; /* free/ allocate list */
302 clockid_t it_clock; /* which timer type */
303 timer_t it_id; /* timer id */
304 int it_overrun; /* overrun on pending signal */
305 int it_overrun_last; /* overrun on last delivered signal */
306 int it_requeue_pending; /* waiting to requeue this timer */
307 int it_sigev_notify; /* notify word of sigevent struct */
308 int it_sigev_signo; /* signo word of sigevent struct */
309 sigval_t it_sigev_value; /* value word of sigevent struct */
310 unsigned long it_incr; /* interval specified in jiffies */
311 struct task_struct *it_process; /* process to send signal to */
312 struct timer_list it_timer;
318 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
319 struct thread_info *thread_info;
321 unsigned long flags; /* per process flags, defined below */
322 unsigned long ptrace;
324 int lock_depth; /* Lock depth */
326 int prio, static_prio;
327 struct list_head run_list;
330 unsigned long sleep_avg;
331 unsigned long last_run;
333 unsigned long policy;
334 unsigned long cpus_allowed;
335 unsigned int time_slice, first_time_slice;
337 struct list_head tasks;
338 struct list_head ptrace_children;
339 struct list_head ptrace_list;
341 struct mm_struct *mm, *active_mm;
344 struct linux_binfmt *binfmt;
345 int exit_code, exit_signal;
346 int pdeath_signal; /* The signal sent when the parent dies */
348 unsigned long personality;
355 /* boolean value for session group leader */
358 * pointers to (original) parent process, youngest child, younger sibling,
359 * older sibling, respectively. (p->father can be replaced with
362 struct task_struct *real_parent; /* real parent process (when being debugged) */
363 struct task_struct *parent; /* parent process */
364 struct list_head children; /* list of my children */
365 struct list_head sibling; /* linkage in my parent's children list */
366 struct task_struct *group_leader;
368 /* PID/PID hash table linkage. */
369 struct pid_link pids[PIDTYPE_MAX];
371 wait_queue_head_t wait_chldexit; /* for wait4() */
372 struct completion *vfork_done; /* for vfork() */
373 int *set_child_tid; /* CLONE_CHILD_SETTID */
374 int *clear_child_tid; /* CLONE_CHILD_CLEARTID */
376 unsigned long rt_priority;
377 unsigned long it_real_value, it_prof_value, it_virt_value;
378 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
379 struct timer_list real_timer;
380 struct list_head posix_timers; /* POSIX.1b Interval Timers */
381 unsigned long utime, stime, cutime, cstime;
383 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
384 unsigned long min_flt, maj_flt, nswap, cmin_flt, cmaj_flt, cnswap;
385 /* process credentials */
386 uid_t uid,euid,suid,fsuid;
387 gid_t gid,egid,sgid,fsgid;
389 gid_t groups[NGROUPS];
390 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
391 int keep_capabilities:1;
392 struct user_struct *user;
394 struct rlimit rlim[RLIM_NLIMITS];
395 unsigned short used_math;
397 /* file system info */
398 int link_count, total_link_count;
399 struct tty_struct *tty; /* NULL if no tty */
400 unsigned int locks; /* How many file locks are being held */
402 struct sysv_sem sysvsem;
403 /* CPU-specific state of this task */
404 struct thread_struct thread;
405 /* filesystem information */
406 struct fs_struct *fs;
407 /* open file information */
408 struct files_struct *files;
410 struct namespace *namespace;
411 /* signal handlers */
412 struct signal_struct *signal;
413 struct sighand_struct *sighand;
415 sigset_t blocked, real_blocked;
416 struct sigpending pending;
418 unsigned long sas_ss_sp;
420 int (*notifier)(void *priv);
422 sigset_t *notifier_mask;
426 /* Thread group tracking */
429 /* Protection of (de-)allocation: mm, files, fs, tty */
430 spinlock_t alloc_lock;
431 /* context-switch lock */
432 spinlock_t switch_lock;
434 /* journalling filesystem info */
436 struct dentry *proc_dentry;
437 struct backing_dev_info *backing_dev_info;
439 unsigned long ptrace_message;
440 siginfo_t *last_siginfo; /* For ptrace use. */
443 extern void __put_task_struct(struct task_struct *tsk);
444 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
445 #define put_task_struct(tsk) \
446 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
451 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
452 /* Not implemented yet, only for 486*/
453 #define PF_STARTING 0x00000002 /* being created */
454 #define PF_EXITING 0x00000004 /* getting shut down */
455 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
456 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
457 #define PF_DUMPCORE 0x00000200 /* dumped core */
458 #define PF_SIGNALED 0x00000400 /* killed by a signal */
459 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
460 #define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */
461 #define PF_FLUSHER 0x00002000 /* responsible for disk writeback */
463 #define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */
464 #define PF_IOTHREAD 0x00008000 /* this thread is needed for doing I/O to swap */
465 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
466 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
467 #define PF_KSWAPD 0x00040000 /* I am kswapd */
468 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
471 extern void set_cpus_allowed(task_t *p, unsigned long new_mask);
473 # define set_cpus_allowed(p, new_mask) do { } while (0)
477 extern void sched_balance_exec(void);
478 extern void node_nr_running_init(void);
480 #define sched_balance_exec() {}
481 #define node_nr_running_init() {}
484 extern void set_user_nice(task_t *p, long nice);
485 extern int task_prio(task_t *p);
486 extern int task_nice(task_t *p);
487 extern int task_curr(task_t *p);
488 extern int idle_cpu(int cpu);
493 * The default (Linux) execution domain.
495 extern struct exec_domain default_exec_domain;
497 #ifndef INIT_THREAD_SIZE
498 # define INIT_THREAD_SIZE 2048*sizeof(long)
502 struct thread_info thread_info;
503 unsigned long stack[INIT_THREAD_SIZE/sizeof(long)];
506 extern union thread_union init_thread_union;
507 extern struct task_struct init_task;
509 extern struct mm_struct init_mm;
511 extern struct task_struct *find_task_by_pid(int pid);
512 extern void set_special_pids(pid_t session, pid_t pgrp);
513 extern void __set_special_pids(pid_t session, pid_t pgrp);
515 /* per-UID process charging. */
516 extern struct user_struct * alloc_uid(uid_t);
517 extern void free_uid(struct user_struct *);
518 extern void switch_uid(struct user_struct *);
520 #include <asm/current.h>
522 extern unsigned long itimer_ticks;
523 extern unsigned long itimer_next;
524 extern void do_timer(struct pt_regs *);
526 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
527 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
528 extern void FASTCALL(wake_up_forked_process(struct task_struct * tsk));
529 extern void FASTCALL(sched_exit(task_t * p));
531 asmlinkage long sys_wait4(pid_t pid,unsigned int * stat_addr, int options, struct rusage * ru);
533 extern int in_group_p(gid_t);
534 extern int in_egroup_p(gid_t);
536 extern void proc_caches_init(void);
537 extern void flush_signals(struct task_struct *);
538 extern void flush_signal_handlers(struct task_struct *, int force_default);
539 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
540 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
542 extern void unblock_all_signals(void);
543 extern void release_task(struct task_struct * p);
544 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
545 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
546 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
547 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
548 extern int kill_pg_info(int, struct siginfo *, pid_t);
549 extern int kill_sl_info(int, struct siginfo *, pid_t);
550 extern int kill_proc_info(int, struct siginfo *, pid_t);
551 extern void notify_parent(struct task_struct *, int);
552 extern void do_notify_parent(struct task_struct *, int);
553 extern void force_sig(int, struct task_struct *);
554 extern void force_sig_specific(int, struct task_struct *);
555 extern int send_sig(int, struct task_struct *, int);
556 extern void zap_other_threads(struct task_struct *p);
557 extern int kill_pg(pid_t, int, int);
558 extern int kill_sl(pid_t, int, int);
559 extern int kill_proc(pid_t, int, int);
560 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
561 extern int do_sigaltstack(const stack_t *, stack_t *, unsigned long);
563 /* These can be the second arg to send_sig_info/send_group_sig_info. */
564 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
565 #define SEND_SIG_PRIV ((struct siginfo *) 1)
566 #define SEND_SIG_FORCED ((struct siginfo *) 2)
568 /* True if we are on the alternate signal stack. */
570 static inline int on_sig_stack(unsigned long sp)
572 return (sp - current->sas_ss_sp < current->sas_ss_size);
575 static inline int sas_ss_flags(unsigned long sp)
577 return (current->sas_ss_size == 0 ? SS_DISABLE
578 : on_sig_stack(sp) ? SS_ONSTACK : 0);
582 #ifdef CONFIG_SECURITY
583 /* code is in security.c */
584 extern int capable(int cap);
586 static inline int capable(int cap)
588 if (cap_raised(current->cap_effective, cap)) {
589 current->flags |= PF_SUPERPRIV;
597 * Routines for handling mm_structs
599 extern struct mm_struct * mm_alloc(void);
601 /* mmdrop drops the mm and the page tables */
602 extern inline void FASTCALL(__mmdrop(struct mm_struct *));
603 static inline void mmdrop(struct mm_struct * mm)
605 if (atomic_dec_and_test(&mm->mm_count))
609 /* mmput gets rid of the mappings and all user-space */
610 extern void mmput(struct mm_struct *);
611 /* Remove the current tasks stale references to the old mm_struct */
612 extern void mm_release(struct task_struct *, struct mm_struct *);
614 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
615 extern void flush_thread(void);
616 extern void exit_thread(void);
618 extern void exit_mm(struct task_struct *);
619 extern void exit_files(struct task_struct *);
620 extern void exit_signal(struct task_struct *);
621 extern void __exit_signal(struct task_struct *);
622 extern void exit_sighand(struct task_struct *);
623 extern void __exit_sighand(struct task_struct *);
624 extern void exit_itimers(struct task_struct *);
626 extern NORET_TYPE void do_group_exit(int);
628 extern void reparent_to_init(void);
629 extern void daemonize(const char *, ...);
630 extern int allow_signal(int);
631 extern task_t *child_reaper;
633 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
634 extern struct task_struct *do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int *, int *);
637 extern void wait_task_inactive(task_t * p);
639 #define wait_task_inactive(p) do { } while (0)
641 extern void kick_if_running(task_t * p);
643 #define remove_parent(p) list_del_init(&(p)->sibling)
644 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
646 #define REMOVE_LINKS(p) do { \
647 if (thread_group_leader(p)) \
648 list_del_init(&(p)->tasks); \
652 #define SET_LINKS(p) do { \
653 if (thread_group_leader(p)) \
654 list_add_tail(&(p)->tasks,&init_task.tasks); \
655 add_parent(p, (p)->parent); \
658 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
659 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
661 #define for_each_process(p) \
662 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
665 * Careful: do_each_thread/while_each_thread is a double loop so
666 * 'break' will not work as expected - use goto instead.
668 #define do_each_thread(g, t) \
669 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
671 #define while_each_thread(g, t) \
672 while ((t = next_thread(t)) != g)
674 extern task_t * FASTCALL(next_thread(task_t *p));
676 #define thread_group_leader(p) (p->pid == p->tgid)
678 static inline int thread_group_empty(task_t *p)
680 struct pid *pid = p->pids[PIDTYPE_TGID].pidptr;
682 return pid->task_list.next->next == &pid->task_list;
685 #define delay_group_leader(p) \
686 (thread_group_leader(p) && !thread_group_empty(p))
688 extern void unhash_process(struct task_struct *p);
690 /* Protects ->fs, ->files, ->mm, and synchronises with wait4().
691 * Nests both inside and outside of read_lock(&tasklist_lock).
692 * It must not be nested with write_lock_irq(&tasklist_lock),
693 * neither inside nor outside.
695 static inline void task_lock(struct task_struct *p)
697 spin_lock(&p->alloc_lock);
700 static inline void task_unlock(struct task_struct *p)
702 spin_unlock(&p->alloc_lock);
706 * get_task_mm - acquire a reference to the task's mm
708 * Returns %NULL if the task has no mm. User must release
709 * the mm via mmput() after use.
711 static inline struct mm_struct * get_task_mm(struct task_struct * task)
713 struct mm_struct * mm;
718 atomic_inc(&mm->mm_users);
725 /* set thread flags in other task's structures
726 * - see asm/thread_info.h for TIF_xxxx flags available
728 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
730 set_ti_thread_flag(tsk->thread_info,flag);
733 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
735 clear_ti_thread_flag(tsk->thread_info,flag);
738 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
740 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
743 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
745 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
748 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
750 return test_ti_thread_flag(tsk->thread_info,flag);
753 static inline void set_tsk_need_resched(struct task_struct *tsk)
755 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
758 static inline void clear_tsk_need_resched(struct task_struct *tsk)
760 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
763 static inline int signal_pending(struct task_struct *p)
765 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
768 static inline int need_resched(void)
770 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
773 extern void __cond_resched(void);
774 static inline void cond_resched(void)
781 * cond_resched_lock() - if a reschedule is pending, drop the given lock,
782 * call schedule, and on return reacquire the lock.
784 * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
785 * operations here to prevent schedule() from being called twice (once via
786 * spin_unlock(), once by hand).
788 static inline void cond_resched_lock(spinlock_t * lock)
790 if (need_resched()) {
791 _raw_spin_unlock(lock);
792 preempt_enable_no_resched();
798 /* Reevaluate whether the task has signals pending delivery.
799 This is required every time the blocked sigset_t changes.
800 callers must hold sighand->siglock. */
802 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
803 extern void recalc_sigpending(void);
805 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
808 * Wrappers for p->thread_info->cpu access. No-op on UP.
812 static inline unsigned int task_cpu(struct task_struct *p)
814 return p->thread_info->cpu;
817 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
819 p->thread_info->cpu = cpu;
824 static inline unsigned int task_cpu(struct task_struct *p)
829 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
833 #endif /* CONFIG_SMP */
835 #endif /* __KERNEL__ */