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>
17 #include <asm/system.h>
18 #include <asm/semaphore.h>
20 #include <asm/ptrace.h>
23 #include <linux/smp.h>
24 #include <linux/sem.h>
25 #include <linux/signal.h>
26 #include <linux/securebits.h>
27 #include <linux/fs_struct.h>
28 #include <linux/compiler.h>
29 #include <linux/completion.h>
30 #include <linux/pid.h>
31 #include <linux/percpu.h>
38 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
39 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
40 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
41 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
42 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
43 #define CLONE_IDLETASK 0x00001000 /* set if new pid should be 0 (kernel only)*/
44 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
45 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
46 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
47 #define CLONE_THREAD 0x00010000 /* Same thread group? */
48 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
49 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
50 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
51 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
52 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
53 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
54 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
55 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
56 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
59 * List of flags we want to share for kernel threads,
60 * if only because they are not used by them anyway.
62 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
65 * These are the constant used to fake the fixed-point load-average
66 * counting. Some notes:
67 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
68 * a load-average precision of 10 bits integer + 11 bits fractional
69 * - if you want to count load-averages more often, you need more
70 * precision, or rounding will get you. With 2-second counting freq,
71 * the EXP_n values would be 1981, 2034 and 2043 if still using only
74 extern unsigned long avenrun[]; /* Load averages */
76 #define FSHIFT 11 /* nr of bits of precision */
77 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
78 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
79 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
80 #define EXP_5 2014 /* 1/exp(5sec/5min) */
81 #define EXP_15 2037 /* 1/exp(5sec/15min) */
83 #define CALC_LOAD(load,exp,n) \
85 load += n*(FIXED_1-exp); \
88 #define CT_TO_SECS(x) ((x) / HZ)
89 #define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ)
91 extern int nr_threads;
93 DECLARE_PER_CPU(unsigned long, process_counts);
94 extern int nr_processes(void);
95 extern unsigned long nr_running(void);
96 extern unsigned long nr_uninterruptible(void);
97 extern unsigned long nr_iowait(void);
99 #include <linux/time.h>
100 #include <linux/param.h>
101 #include <linux/resource.h>
102 #include <linux/timer.h>
104 #include <asm/processor.h>
105 #include <linux/vserver/context.h>
107 #define TASK_RUNNING 0
108 #define TASK_INTERRUPTIBLE 1
109 #define TASK_UNINTERRUPTIBLE 2
110 #define TASK_STOPPED 4
111 #define TASK_ZOMBIE 8
113 #define TASK_ONHOLD 32
115 #define __set_task_state(tsk, state_value) \
116 do { (tsk)->state = (state_value); } while (0)
117 #define set_task_state(tsk, state_value) \
118 set_mb((tsk)->state, (state_value))
120 #define __set_current_state(state_value) \
121 do { current->state = (state_value); } while (0)
122 #define set_current_state(state_value) \
123 set_mb(current->state, (state_value))
126 * Scheduling policies
128 #define SCHED_NORMAL 0
138 #include <linux/spinlock.h>
141 * This serializes "schedule()" and also protects
142 * the run-queue from deletions/modifications (but
143 * _adding_ to the beginning of the run-queue has
146 extern rwlock_t tasklist_lock;
147 extern spinlock_t mmlist_lock;
149 typedef struct task_struct task_t;
151 extern void sched_init(void);
152 extern void sched_init_smp(void);
153 extern void init_idle(task_t *idle, int cpu);
155 extern cpumask_t nohz_cpu_mask;
157 extern void show_state(void);
158 extern void show_regs(struct pt_regs *);
161 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
162 * task), SP is the stack pointer of the first frame that should be shown in the back
163 * trace (or NULL if the entire call-chain of the task should be shown).
165 extern void show_stack(struct task_struct *task, unsigned long *sp);
167 void io_schedule(void);
168 long io_schedule_timeout(long timeout);
170 extern void cpu_init (void);
171 extern void trap_init(void);
172 extern void update_process_times(int user);
173 extern void update_one_process(struct task_struct *p, unsigned long user,
174 unsigned long system, int cpu);
175 extern void scheduler_tick(int user_tick, int system);
176 extern unsigned long cache_decay_ticks;
178 /* Attach to any functions which should be ignored in wchan output. */
179 #define __sched __attribute__((__section__(".sched.text")))
180 /* Is this address in the __sched functions? */
181 extern int in_sched_functions(unsigned long addr);
183 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
184 extern signed long FASTCALL(schedule_timeout(signed long timeout));
185 asmlinkage void schedule(void);
189 /* Maximum number of active map areas.. This is a random (large) number */
190 #define DEFAULT_MAX_MAP_COUNT 65536
192 extern int sysctl_max_map_count;
194 #include <linux/aio.h>
197 struct vm_area_struct * mmap; /* list of VMAs */
198 struct rb_root mm_rb;
199 struct vm_area_struct * mmap_cache; /* last find_vma result */
200 unsigned long free_area_cache; /* first hole */
202 atomic_t mm_users; /* How many users with user space? */
203 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
204 int map_count; /* number of VMAs */
205 struct rw_semaphore mmap_sem;
206 spinlock_t page_table_lock; /* Protects task page tables and mm->rss */
208 struct list_head mmlist; /* List of all active mm's. These are globally strung
209 * together off init_mm.mmlist, and are protected
213 unsigned long start_code, end_code, start_data, end_data;
214 unsigned long start_brk, brk, start_stack;
215 unsigned long arg_start, arg_end, env_start, env_end;
216 unsigned long rss, total_vm, locked_vm;
217 unsigned long def_flags;
219 unsigned long saved_auxv[40]; /* for /proc/PID/auxv */
222 #ifdef CONFIG_HUGETLB_PAGE
225 cpumask_t cpu_vm_mask;
227 /* Architecture-specific MM context */
228 mm_context_t context;
229 struct vx_info *mm_vx_info;
231 /* coredumping support */
233 struct completion *core_startup_done, core_done;
236 rwlock_t ioctx_list_lock;
237 struct kioctx *ioctx_list;
239 struct kioctx default_kioctx;
242 extern int mmlist_nr;
244 struct sighand_struct {
246 struct k_sigaction action[_NSIG];
251 * NOTE! "signal_struct" does not have it's own
252 * locking, because a shared signal_struct always
253 * implies a shared sighand_struct, so locking
254 * sighand_struct is always a proper superset of
255 * the locking of signal_struct.
257 struct signal_struct {
260 /* current thread group signal load-balancing target: */
263 /* shared signal handling: */
264 struct sigpending shared_pending;
266 /* thread group exit support */
270 * - notify group_exit_task when ->count is equal to notify_count
271 * - everyone except group_exit_task is stopped during signal delivery
272 * of fatal signals, group_exit_task processes the signal.
274 struct task_struct *group_exit_task;
277 /* thread group stop support, overloads group_exit_code too */
278 int group_stop_count;
280 /* POSIX.1b Interval Timers */
281 struct list_head posix_timers;
283 /* job control IDs */
287 /* boolean value for session group leader */
290 struct tty_struct *tty; /* NULL if no tty */
294 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
295 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
296 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
297 * are inverted: lower p->prio value means higher priority.
299 * The MAX_USER_RT_PRIO value allows the actual maximum
300 * RT priority to be separate from the value exported to
301 * user-space. This allows kernel threads to set their
302 * priority to a value higher than any user task. Note:
303 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
306 #define MAX_USER_RT_PRIO 100
307 #define MAX_RT_PRIO MAX_USER_RT_PRIO
309 #define MAX_PRIO (MAX_RT_PRIO + 40)
311 #define rt_task(p) ((p)->prio < MAX_RT_PRIO)
314 * Some day this will be a full-fledged user tracking system..
317 atomic_t __count; /* reference count */
318 atomic_t processes; /* How many processes does this user have? */
319 atomic_t files; /* How many open files does this user have? */
321 /* Hash table maintenance information */
322 struct list_head uidhash_list;
327 extern struct user_struct *find_user(xid_t, uid_t);
329 extern struct user_struct root_user;
330 #define INIT_USER (&root_user)
332 typedef struct prio_array prio_array_t;
333 struct backing_dev_info;
334 struct reclaim_state;
336 /* POSIX.1b interval timer structure. */
338 struct list_head list; /* free/ allocate list */
340 clockid_t it_clock; /* which timer type */
341 timer_t it_id; /* timer id */
342 int it_overrun; /* overrun on pending signal */
343 int it_overrun_last; /* overrun on last delivered signal */
344 int it_requeue_pending; /* waiting to requeue this timer */
345 int it_sigev_notify; /* notify word of sigevent struct */
346 int it_sigev_signo; /* signo word of sigevent struct */
347 sigval_t it_sigev_value; /* value word of sigevent struct */
348 unsigned long it_incr; /* interval specified in jiffies */
349 struct task_struct *it_process; /* process to send signal to */
350 struct timer_list it_timer;
351 struct sigqueue *sigq; /* signal queue entry. */
355 struct io_context; /* See blkdev.h */
356 void exit_io_context(void);
358 #define NGROUPS_SMALL 32
359 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
363 gid_t small_block[NGROUPS_SMALL];
368 #define get_group_info(group_info) do { \
369 atomic_inc(&(group_info)->usage); \
372 #define put_group_info(group_info) do { \
373 if (atomic_dec_and_test(&(group_info)->usage)) \
374 groups_free(group_info); \
377 struct group_info *groups_alloc(int gidsetsize);
378 void groups_free(struct group_info *group_info);
379 int set_current_groups(struct group_info *group_info);
380 /* access the groups "array" with this macro */
381 #define GROUP_AT(gi, i) \
382 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
385 struct audit_context; /* See audit.c */
389 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
390 struct thread_info *thread_info;
392 unsigned long flags; /* per process flags, defined below */
393 unsigned long ptrace;
395 int lock_depth; /* Lock depth */
397 int prio, static_prio;
398 struct list_head run_list;
401 unsigned long sleep_avg;
402 long interactive_credit;
403 unsigned long long timestamp;
406 unsigned long policy;
407 cpumask_t cpus_allowed;
408 unsigned int time_slice, first_time_slice;
410 struct list_head tasks;
411 struct list_head ptrace_children;
412 struct list_head ptrace_list;
414 struct mm_struct *mm, *active_mm;
417 struct linux_binfmt *binfmt;
418 int exit_code, exit_signal;
419 int pdeath_signal; /* The signal sent when the parent dies */
421 unsigned long personality;
426 * pointers to (original) parent process, youngest child, younger sibling,
427 * older sibling, respectively. (p->father can be replaced with
430 struct task_struct *real_parent; /* real parent process (when being debugged) */
431 struct task_struct *parent; /* parent process */
432 struct list_head children; /* list of my children */
433 struct list_head sibling; /* linkage in my parent's children list */
434 struct task_struct *group_leader; /* threadgroup leader */
436 /* PID/PID hash table linkage. */
437 struct pid_link pids[PIDTYPE_MAX];
439 wait_queue_head_t wait_chldexit; /* for wait4() */
440 struct completion *vfork_done; /* for vfork() */
441 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
442 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
444 unsigned long rt_priority;
445 unsigned long it_real_value, it_prof_value, it_virt_value;
446 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
447 struct timer_list real_timer;
448 unsigned long utime, stime, cutime, cstime;
449 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; /* context switch counts */
451 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
452 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
453 /* process credentials */
454 uid_t uid,euid,suid,fsuid;
455 gid_t gid,egid,sgid,fsgid;
456 struct group_info *group_info;
457 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
458 int keep_capabilities:1;
459 struct user_struct *user;
461 struct rlimit rlim[RLIM_NLIMITS];
462 unsigned short used_math;
464 /* file system info */
465 int link_count, total_link_count;
467 struct sysv_sem sysvsem;
468 /* CPU-specific state of this task */
469 struct thread_struct thread;
470 /* filesystem information */
471 struct fs_struct *fs;
472 /* open file information */
473 struct files_struct *files;
475 struct namespace *namespace;
476 /* signal handlers */
477 struct signal_struct *signal;
478 struct sighand_struct *sighand;
480 sigset_t blocked, real_blocked;
481 struct sigpending pending;
483 unsigned long sas_ss_sp;
485 int (*notifier)(void *priv);
487 sigset_t *notifier_mask;
490 struct audit_context *audit_context;
492 /* vserver context data */
494 struct vx_info *vx_info;
496 /* vserver network data */
498 struct nx_info *nx_info;
500 /* Thread group tracking */
503 /* Protection of (de-)allocation: mm, files, fs, tty */
504 spinlock_t alloc_lock;
505 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
506 spinlock_t proc_lock;
507 /* context-switch lock */
508 spinlock_t switch_lock;
510 /* journalling filesystem info */
514 struct reclaim_state *reclaim_state;
516 struct dentry *proc_dentry;
517 struct backing_dev_info *backing_dev_info;
519 struct io_context *io_context;
521 unsigned long ptrace_message;
522 siginfo_t *last_siginfo; /* For ptrace use. */
525 struct mempolicy *mempolicy;
526 short il_next; /* could be shared with used_math */
530 static inline pid_t process_group(struct task_struct *tsk)
532 return tsk->signal->pgrp;
535 extern void __put_task_struct(struct task_struct *tsk);
536 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
537 #define put_task_struct(tsk) \
538 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
543 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
544 /* Not implemented yet, only for 486*/
545 #define PF_STARTING 0x00000002 /* being created */
546 #define PF_EXITING 0x00000004 /* getting shut down */
547 #define PF_DEAD 0x00000008 /* Dead */
548 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
549 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
550 #define PF_DUMPCORE 0x00000200 /* dumped core */
551 #define PF_SIGNALED 0x00000400 /* killed by a signal */
552 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
553 #define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */
554 #define PF_FLUSHER 0x00002000 /* responsible for disk writeback */
556 #define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */
557 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
558 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
559 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
560 #define PF_KSWAPD 0x00040000 /* I am kswapd */
561 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
562 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
563 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
566 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
568 #define SD_BALANCE_NEWIDLE 1 /* Balance when about to become idle */
569 #define SD_BALANCE_EXEC 2 /* Balance on exec */
570 #define SD_BALANCE_CLONE 4 /* Balance on clone */
571 #define SD_WAKE_IDLE 8 /* Wake to idle CPU on task wakeup */
572 #define SD_WAKE_AFFINE 16 /* Wake task to waking CPU */
573 #define SD_WAKE_BALANCE 32 /* Perform balancing at task wakeup */
574 #define SD_SHARE_CPUPOWER 64 /* Domain members share cpu power */
577 struct sched_group *next; /* Must be a circular list */
581 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
582 * single CPU. This should be read only (except for setup). Although
583 * it will need to be written to at cpu hot(un)plug time, perhaps the
584 * cpucontrol semaphore will provide enough exclusion?
586 unsigned long cpu_power;
589 struct sched_domain {
590 /* These fields must be setup */
591 struct sched_domain *parent; /* top domain must be null terminated */
592 struct sched_group *groups; /* the balancing groups of the domain */
593 cpumask_t span; /* span of all CPUs in this domain */
594 unsigned long min_interval; /* Minimum balance interval ms */
595 unsigned long max_interval; /* Maximum balance interval ms */
596 unsigned int busy_factor; /* less balancing by factor if busy */
597 unsigned int imbalance_pct; /* No balance until over watermark */
598 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
599 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
600 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
601 int flags; /* See SD_* */
603 /* Runtime fields. */
604 unsigned long last_balance; /* init to jiffies. units in jiffies */
605 unsigned int balance_interval; /* initialise to 1. units in ms. */
606 unsigned int nr_balance_failed; /* initialise to 0 */
609 /* Common values for SMT siblings */
610 #define SD_SIBLING_INIT (struct sched_domain) { \
611 .span = CPU_MASK_NONE, \
617 .imbalance_pct = 110, \
618 .cache_hot_time = 0, \
619 .cache_nice_tries = 0, \
620 .per_cpu_gain = 15, \
621 .flags = SD_BALANCE_NEWIDLE \
626 | SD_SHARE_CPUPOWER, \
627 .last_balance = jiffies, \
628 .balance_interval = 1, \
629 .nr_balance_failed = 0, \
632 /* Common values for CPUs */
633 #define SD_CPU_INIT (struct sched_domain) { \
634 .span = CPU_MASK_NONE, \
640 .imbalance_pct = 125, \
641 .cache_hot_time = (5*1000000/2), \
642 .cache_nice_tries = 1, \
643 .per_cpu_gain = 100, \
644 .flags = SD_BALANCE_NEWIDLE \
649 .last_balance = jiffies, \
650 .balance_interval = 1, \
651 .nr_balance_failed = 0, \
655 /* Common values for NUMA nodes */
656 #define SD_NODE_INIT (struct sched_domain) { \
657 .span = CPU_MASK_NONE, \
661 .max_interval = 32, \
663 .imbalance_pct = 125, \
664 .cache_hot_time = (10*1000000), \
665 .cache_nice_tries = 1, \
666 .per_cpu_gain = 100, \
667 .flags = SD_BALANCE_EXEC \
670 .last_balance = jiffies, \
671 .balance_interval = 1, \
672 .nr_balance_failed = 0, \
676 extern void cpu_attach_domain(struct sched_domain *sd, int cpu);
678 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
680 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
686 extern unsigned long long sched_clock(void);
689 extern void sched_balance_exec(void);
691 #define sched_balance_exec() {}
694 extern void sched_idle_next(void);
695 extern void set_user_nice(task_t *p, long nice);
696 extern int task_prio(task_t *p);
697 extern int task_nice(task_t *p);
698 extern int task_curr(task_t *p);
699 extern int idle_cpu(int cpu);
704 * The default (Linux) execution domain.
706 extern struct exec_domain default_exec_domain;
709 struct thread_info thread_info;
710 unsigned long stack[THREAD_SIZE/sizeof(long)];
713 #ifndef __HAVE_ARCH_KSTACK_END
714 static inline int kstack_end(void *addr)
716 /* Reliable end of stack detection:
717 * Some APM bios versions misalign the stack
719 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
723 extern union thread_union init_thread_union;
724 extern struct task_struct init_task;
726 extern struct mm_struct init_mm;
728 extern struct task_struct *find_task_by_pid(int pid);
729 extern void set_special_pids(pid_t session, pid_t pgrp);
730 extern void __set_special_pids(pid_t session, pid_t pgrp);
732 /* per-UID process charging. */
733 extern struct user_struct * alloc_uid(xid_t, uid_t);
734 extern void free_uid(struct user_struct *);
735 extern void switch_uid(struct user_struct *);
737 #include <asm/current.h>
739 extern unsigned long itimer_ticks;
740 extern unsigned long itimer_next;
741 extern void do_timer(struct pt_regs *);
743 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
744 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
745 extern void FASTCALL(wake_up_forked_process(struct task_struct * tsk));
747 extern void kick_process(struct task_struct *tsk);
748 extern void FASTCALL(wake_up_forked_thread(struct task_struct * tsk));
750 static inline void kick_process(struct task_struct *tsk) { }
751 static inline void wake_up_forked_thread(struct task_struct * tsk)
753 wake_up_forked_process(tsk);
756 extern void FASTCALL(sched_fork(task_t * p));
757 extern void FASTCALL(sched_exit(task_t * p));
759 extern int in_group_p(gid_t);
760 extern int in_egroup_p(gid_t);
762 extern void proc_caches_init(void);
763 extern void flush_signals(struct task_struct *);
764 extern void flush_signal_handlers(struct task_struct *, int force_default);
765 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
767 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
772 spin_lock_irqsave(&tsk->sighand->siglock, flags);
773 ret = dequeue_signal(tsk, mask, info);
774 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
779 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
781 extern void unblock_all_signals(void);
782 extern void release_task(struct task_struct * p);
783 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
784 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
785 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
786 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
787 extern int kill_pg_info(int, struct siginfo *, pid_t);
788 extern int kill_sl_info(int, struct siginfo *, pid_t);
789 extern int kill_proc_info(int, struct siginfo *, pid_t);
790 extern void notify_parent(struct task_struct *, int);
791 extern void do_notify_parent(struct task_struct *, int);
792 extern void force_sig(int, struct task_struct *);
793 extern void force_sig_specific(int, struct task_struct *);
794 extern int send_sig(int, struct task_struct *, int);
795 extern void zap_other_threads(struct task_struct *p);
796 extern int kill_pg(pid_t, int, int);
797 extern int kill_sl(pid_t, int, int);
798 extern int kill_proc(pid_t, int, int);
799 extern struct sigqueue *sigqueue_alloc(void);
800 extern void sigqueue_free(struct sigqueue *);
801 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
802 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
803 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
804 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
806 /* These can be the second arg to send_sig_info/send_group_sig_info. */
807 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
808 #define SEND_SIG_PRIV ((struct siginfo *) 1)
809 #define SEND_SIG_FORCED ((struct siginfo *) 2)
811 /* True if we are on the alternate signal stack. */
813 static inline int on_sig_stack(unsigned long sp)
815 return (sp - current->sas_ss_sp < current->sas_ss_size);
818 static inline int sas_ss_flags(unsigned long sp)
820 return (current->sas_ss_size == 0 ? SS_DISABLE
821 : on_sig_stack(sp) ? SS_ONSTACK : 0);
825 #ifdef CONFIG_SECURITY
826 /* code is in security.c */
827 extern int capable(int cap);
829 static inline int capable(int cap)
831 if (cap_raised(current->cap_effective, cap)) {
832 current->flags |= PF_SUPERPRIV;
840 * Routines for handling mm_structs
842 extern struct mm_struct * mm_alloc(void);
844 /* mmdrop drops the mm and the page tables */
845 extern void FASTCALL(__mmdrop(struct mm_struct *));
846 static inline void mmdrop(struct mm_struct * mm)
848 if (atomic_dec_and_test(&mm->mm_count))
852 /* mmput gets rid of the mappings and all user-space */
853 extern void mmput(struct mm_struct *);
854 /* Grab a reference to the mm if its not already going away */
855 extern struct mm_struct *mmgrab(struct mm_struct *);
856 /* Remove the current tasks stale references to the old mm_struct */
857 extern void mm_release(struct task_struct *, struct mm_struct *);
859 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
860 extern void flush_thread(void);
861 extern void exit_thread(void);
863 extern void exit_mm(struct task_struct *);
864 extern void exit_files(struct task_struct *);
865 extern void exit_signal(struct task_struct *);
866 extern void __exit_signal(struct task_struct *);
867 extern void exit_sighand(struct task_struct *);
868 extern void __exit_sighand(struct task_struct *);
869 extern void exit_itimers(struct signal_struct *);
871 extern NORET_TYPE void do_group_exit(int);
873 extern void reparent_to_init(void);
874 extern void daemonize(const char *, ...);
875 extern int allow_signal(int);
876 extern int disallow_signal(int);
877 extern task_t *child_reaper;
879 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
880 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
881 extern struct task_struct * copy_process(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
884 extern void wait_task_inactive(task_t * p);
886 #define wait_task_inactive(p) do { } while (0)
889 #define remove_parent(p) list_del_init(&(p)->sibling)
890 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
892 #define REMOVE_LINKS(p) do { \
893 if (thread_group_leader(p)) \
894 list_del_init(&(p)->tasks); \
898 #define SET_LINKS(p) do { \
899 if (thread_group_leader(p)) \
900 list_add_tail(&(p)->tasks,&init_task.tasks); \
901 add_parent(p, (p)->parent); \
904 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
905 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
907 #define for_each_process(p) \
908 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
911 * Careful: do_each_thread/while_each_thread is a double loop so
912 * 'break' will not work as expected - use goto instead.
914 #define do_each_thread(g, t) \
915 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
917 #define while_each_thread(g, t) \
918 while ((t = next_thread(t)) != g)
920 extern task_t * FASTCALL(next_thread(task_t *p));
922 #define thread_group_leader(p) (p->pid == p->tgid)
924 static inline int thread_group_empty(task_t *p)
926 struct pid *pid = p->pids[PIDTYPE_TGID].pidptr;
928 return pid->task_list.next->next == &pid->task_list;
931 #define delay_group_leader(p) \
932 (thread_group_leader(p) && !thread_group_empty(p))
934 extern void unhash_process(struct task_struct *p);
937 * Protects ->fs, ->files, ->mm, ->ptrace and synchronises with wait4().
938 * Nests both inside and outside of read_lock(&tasklist_lock).
939 * It must not be nested with write_lock_irq(&tasklist_lock),
940 * neither inside nor outside.
942 static inline void task_lock(struct task_struct *p)
944 spin_lock(&p->alloc_lock);
947 static inline void task_unlock(struct task_struct *p)
949 spin_unlock(&p->alloc_lock);
953 * get_task_mm - acquire a reference to the task's mm
955 * Returns %NULL if the task has no mm. User must release
956 * the mm via mmput() after use.
958 static inline struct mm_struct * get_task_mm(struct task_struct * task)
960 struct mm_struct * mm;
972 /* set thread flags in other task's structures
973 * - see asm/thread_info.h for TIF_xxxx flags available
975 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
977 set_ti_thread_flag(tsk->thread_info,flag);
980 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
982 clear_ti_thread_flag(tsk->thread_info,flag);
985 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
987 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
990 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
992 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
995 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
997 return test_ti_thread_flag(tsk->thread_info,flag);
1000 static inline void set_tsk_need_resched(struct task_struct *tsk)
1002 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1005 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1007 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1010 static inline int signal_pending(struct task_struct *p)
1012 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1015 static inline int need_resched(void)
1017 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1020 extern void __cond_resched(void);
1021 static inline void cond_resched(void)
1028 * cond_resched_lock() - if a reschedule is pending, drop the given lock,
1029 * call schedule, and on return reacquire the lock.
1031 * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
1032 * operations here to prevent schedule() from being called twice (once via
1033 * spin_unlock(), once by hand).
1035 static inline void cond_resched_lock(spinlock_t * lock)
1037 if (need_resched()) {
1038 _raw_spin_unlock(lock);
1039 preempt_enable_no_resched();
1045 /* Reevaluate whether the task has signals pending delivery.
1046 This is required every time the blocked sigset_t changes.
1047 callers must hold sighand->siglock. */
1049 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
1050 extern void recalc_sigpending(void);
1052 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1055 * Wrappers for p->thread_info->cpu access. No-op on UP.
1059 static inline unsigned int task_cpu(struct task_struct *p)
1061 return p->thread_info->cpu;
1064 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1066 p->thread_info->cpu = cpu;
1071 static inline unsigned int task_cpu(struct task_struct *p)
1076 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1080 #endif /* CONFIG_SMP */
1082 #endif /* __KERNEL__ */