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_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 /* Unused, ignored */
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 */
55 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
58 * List of flags we want to share for kernel threads,
59 * if only because they are not used by them anyway.
61 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
64 * These are the constant used to fake the fixed-point load-average
65 * counting. Some notes:
66 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
67 * a load-average precision of 10 bits integer + 11 bits fractional
68 * - if you want to count load-averages more often, you need more
69 * precision, or rounding will get you. With 2-second counting freq,
70 * the EXP_n values would be 1981, 2034 and 2043 if still using only
73 extern unsigned long avenrun[]; /* Load averages */
75 #define FSHIFT 11 /* nr of bits of precision */
76 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
77 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
78 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
79 #define EXP_5 2014 /* 1/exp(5sec/5min) */
80 #define EXP_15 2037 /* 1/exp(5sec/15min) */
82 #define CALC_LOAD(load,exp,n) \
84 load += n*(FIXED_1-exp); \
87 #define CT_TO_SECS(x) ((x) / HZ)
88 #define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ)
90 extern int nr_threads;
92 DECLARE_PER_CPU(unsigned long, process_counts);
93 extern int nr_processes(void);
94 extern unsigned long nr_running(void);
95 extern unsigned long nr_uninterruptible(void);
96 extern unsigned long nr_iowait(void);
98 #include <linux/time.h>
99 #include <linux/param.h>
100 #include <linux/resource.h>
101 #include <linux/timer.h>
103 #include <asm/processor.h>
105 #define TASK_RUNNING 0
106 #define TASK_INTERRUPTIBLE 1
107 #define TASK_UNINTERRUPTIBLE 2
108 #define TASK_STOPPED 4
109 #define TASK_TRACED 8
110 #define TASK_ZOMBIE 16
112 #define TASK_ONHOLD 64
114 #define __set_task_state(tsk, state_value) \
115 do { (tsk)->state = (state_value); } while (0)
116 #define set_task_state(tsk, state_value) \
117 set_mb((tsk)->state, (state_value))
119 #define __set_current_state(state_value) \
120 do { current->state = (state_value); } while (0)
121 #define set_current_state(state_value) \
122 set_mb(current->state, (state_value))
125 * Scheduling policies
127 #define SCHED_NORMAL 0
137 #include <linux/spinlock.h>
140 * This serializes "schedule()" and also protects
141 * the run-queue from deletions/modifications (but
142 * _adding_ to the beginning of the run-queue has
145 extern rwlock_t tasklist_lock;
146 extern spinlock_t mmlist_lock;
148 typedef struct task_struct task_t;
150 extern void sched_init(void);
151 extern void sched_init_smp(void);
152 extern void init_idle(task_t *idle, int cpu);
154 extern cpumask_t nohz_cpu_mask;
156 extern void show_state(void);
157 extern void show_regs(struct pt_regs *);
160 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
161 * task), SP is the stack pointer of the first frame that should be shown in the back
162 * trace (or NULL if the entire call-chain of the task should be shown).
164 extern void show_stack(struct task_struct *task, unsigned long *sp);
166 void io_schedule(void);
167 long io_schedule_timeout(long timeout);
169 extern void cpu_init (void);
170 extern void trap_init(void);
171 extern void update_process_times(int user);
172 extern void scheduler_tick(int user_tick, int system);
173 extern unsigned long cache_decay_ticks;
175 /* Attach to any functions which should be ignored in wchan output. */
176 #define __sched __attribute__((__section__(".sched.text")))
177 /* Is this address in the __sched functions? */
178 extern int in_sched_functions(unsigned long addr);
180 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
181 extern signed long FASTCALL(schedule_timeout(signed long timeout));
182 asmlinkage void schedule(void);
186 /* Maximum number of active map areas.. This is a random (large) number */
187 #define DEFAULT_MAX_MAP_COUNT 65536
189 extern int sysctl_max_map_count;
191 #include <linux/aio.h>
194 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
195 unsigned long, unsigned long);
197 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
198 unsigned long len, unsigned long pgoff,
199 unsigned long flags);
200 extern void arch_unmap_area(struct vm_area_struct *area);
201 extern void arch_unmap_area_topdown(struct vm_area_struct *area);
205 struct vm_area_struct * mmap; /* list of VMAs */
206 struct rb_root mm_rb;
207 struct vm_area_struct * mmap_cache; /* last find_vma result */
208 unsigned long (*get_unmapped_area) (struct file *filp,
209 unsigned long addr, unsigned long len,
210 unsigned long pgoff, unsigned long flags);
211 void (*unmap_area) (struct vm_area_struct *area);
212 unsigned long mmap_base; /* base of mmap area */
213 unsigned long free_area_cache; /* first hole */
215 atomic_t mm_users; /* How many users with user space? */
216 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
217 int map_count; /* number of VMAs */
218 struct rw_semaphore mmap_sem;
219 spinlock_t page_table_lock; /* Protects task page tables and mm->rss */
221 struct list_head mmlist; /* List of all active mm's. These are globally strung
222 * together off init_mm.mmlist, and are protected
226 unsigned long start_code, end_code, start_data, end_data;
227 unsigned long start_brk, brk, start_stack;
228 unsigned long arg_start, arg_end, env_start, env_end;
229 unsigned long rss, total_vm, locked_vm, shared_vm;
230 unsigned long exec_vm, stack_vm, reserved_vm, def_flags;
232 unsigned long saved_auxv[42]; /* for /proc/PID/auxv */
235 cpumask_t cpu_vm_mask;
237 /* Architecture-specific MM context */
238 mm_context_t context;
239 struct vx_info *mm_vx_info;
241 /* Token based thrashing protection. */
242 unsigned long swap_token_time;
245 /* coredumping support */
247 struct completion *core_startup_done, core_done;
250 rwlock_t ioctx_list_lock;
251 struct kioctx *ioctx_list;
253 struct kioctx default_kioctx;
256 extern int mmlist_nr;
258 struct sighand_struct {
260 struct k_sigaction action[_NSIG];
265 * NOTE! "signal_struct" does not have it's own
266 * locking, because a shared signal_struct always
267 * implies a shared sighand_struct, so locking
268 * sighand_struct is always a proper superset of
269 * the locking of signal_struct.
271 struct signal_struct {
274 /* current thread group signal load-balancing target: */
277 /* shared signal handling: */
278 struct sigpending shared_pending;
280 /* thread group exit support */
284 * - notify group_exit_task when ->count is equal to notify_count
285 * - everyone except group_exit_task is stopped during signal delivery
286 * of fatal signals, group_exit_task processes the signal.
288 struct task_struct *group_exit_task;
291 /* thread group stop support, overloads group_exit_code too */
292 int group_stop_count;
293 /* 1 if group stopped since last SIGCONT, -1 if SIGCONT since report */
296 /* POSIX.1b Interval Timers */
297 struct list_head posix_timers;
299 /* job control IDs */
303 /* boolean value for session group leader */
306 struct tty_struct *tty; /* NULL if no tty */
309 * Cumulative resource counters for dead threads in the group,
310 * and for reaped dead child processes forked by this group.
311 * Live threads maintain their own counters and add to these
312 * in __exit_signal, except for the group leader.
314 unsigned long utime, stime, cutime, cstime;
315 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
316 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
320 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
321 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
322 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
323 * are inverted: lower p->prio value means higher priority.
325 * The MAX_USER_RT_PRIO value allows the actual maximum
326 * RT priority to be separate from the value exported to
327 * user-space. This allows kernel threads to set their
328 * priority to a value higher than any user task. Note:
329 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
332 #define MAX_USER_RT_PRIO 100
333 #define MAX_RT_PRIO MAX_USER_RT_PRIO
335 #define MAX_PRIO (MAX_RT_PRIO + 40)
337 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
340 * Some day this will be a full-fledged user tracking system..
343 atomic_t __count; /* reference count */
344 atomic_t processes; /* How many processes does this user have? */
345 atomic_t files; /* How many open files does this user have? */
346 atomic_t sigpending; /* How many pending signals does this user have? */
347 /* protected by mq_lock */
348 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
349 unsigned long locked_shm; /* How many pages of mlocked shm ? */
351 /* Hash table maintenance information */
352 struct list_head uidhash_list;
357 extern struct user_struct *find_user(xid_t, uid_t);
359 extern struct user_struct root_user;
360 #define INIT_USER (&root_user)
362 typedef struct prio_array prio_array_t;
363 struct backing_dev_info;
364 struct reclaim_state;
366 /* POSIX.1b interval timer structure. */
368 struct list_head list; /* free/ allocate list */
370 clockid_t it_clock; /* which timer type */
371 timer_t it_id; /* timer id */
372 int it_overrun; /* overrun on pending signal */
373 int it_overrun_last; /* overrun on last delivered signal */
374 int it_requeue_pending; /* waiting to requeue this timer */
375 int it_sigev_notify; /* notify word of sigevent struct */
376 int it_sigev_signo; /* signo word of sigevent struct */
377 sigval_t it_sigev_value; /* value word of sigevent struct */
378 unsigned long it_incr; /* interval specified in jiffies */
379 struct task_struct *it_process; /* process to send signal to */
380 struct timer_list it_timer;
381 struct sigqueue *sigq; /* signal queue entry. */
382 struct list_head abs_timer_entry; /* clock abs_timer_list */
383 struct timespec wall_to_prev; /* wall_to_monotonic used when set */
386 #ifdef CONFIG_SCHEDSTATS
388 /* cumulative counters */
389 unsigned long cpu_time, /* time spent on the cpu */
390 run_delay, /* time spent waiting on a runqueue */
391 pcnt; /* # of timeslices run on this cpu */
394 unsigned long last_arrival, /* when we last ran on a cpu */
395 last_queued; /* when we were last queued to run */
398 extern struct file_operations proc_schedstat_operations;
401 struct io_context; /* See blkdev.h */
402 void exit_io_context(void);
404 #define NGROUPS_SMALL 32
405 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
409 gid_t small_block[NGROUPS_SMALL];
415 * get_group_info() must be called with the owning task locked (via task_lock())
416 * when task != current. The reason being that the vast majority of callers are
417 * looking at current->group_info, which can not be changed except by the
418 * current task. Changing current->group_info requires the task lock, too.
420 #define get_group_info(group_info) do { \
421 atomic_inc(&(group_info)->usage); \
424 #define put_group_info(group_info) do { \
425 if (atomic_dec_and_test(&(group_info)->usage)) \
426 groups_free(group_info); \
429 struct group_info *groups_alloc(int gidsetsize);
430 void groups_free(struct group_info *group_info);
431 int set_current_groups(struct group_info *group_info);
432 /* access the groups "array" with this macro */
433 #define GROUP_AT(gi, i) \
434 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
437 struct audit_context; /* See audit.c */
441 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
442 struct thread_info *thread_info;
444 unsigned long flags; /* per process flags, defined below */
445 unsigned long ptrace;
447 int lock_depth; /* Lock depth */
449 int prio, static_prio;
450 struct list_head run_list;
453 unsigned long sleep_avg;
454 long interactive_credit;
455 unsigned long long timestamp, last_ran;
458 unsigned long policy;
459 cpumask_t cpus_allowed;
460 unsigned int time_slice, first_time_slice;
462 #ifdef CONFIG_SCHEDSTATS
463 struct sched_info sched_info;
466 struct list_head tasks;
468 * ptrace_list/ptrace_children forms the list of my children
469 * that were stolen by a ptracer.
471 struct list_head ptrace_children;
472 struct list_head ptrace_list;
474 struct mm_struct *mm, *active_mm;
477 struct linux_binfmt *binfmt;
478 int exit_code, exit_signal;
479 int pdeath_signal; /* The signal sent when the parent dies */
481 unsigned long personality;
486 * pointers to (original) parent process, youngest child, younger sibling,
487 * older sibling, respectively. (p->father can be replaced with
490 struct task_struct *real_parent; /* real parent process (when being debugged) */
491 struct task_struct *parent; /* parent process */
493 * children/sibling forms the list of my children plus the
494 * tasks I'm ptracing.
496 struct list_head children; /* list of my children */
497 struct list_head sibling; /* linkage in my parent's children list */
498 struct task_struct *group_leader; /* threadgroup leader */
500 /* PID/PID hash table linkage. */
501 struct pid pids[PIDTYPE_MAX];
503 wait_queue_head_t wait_chldexit; /* for wait4() */
504 struct completion *vfork_done; /* for vfork() */
505 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
506 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
508 unsigned long rt_priority;
509 unsigned long it_real_value, it_prof_value, it_virt_value;
510 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
511 struct timer_list real_timer;
512 unsigned long utime, stime;
513 unsigned long nvcsw, nivcsw; /* context switch counts */
514 struct timespec start_time;
515 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
516 unsigned long min_flt, maj_flt;
517 /* process credentials */
518 uid_t uid,euid,suid,fsuid;
519 gid_t gid,egid,sgid,fsgid;
520 struct group_info *group_info;
521 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
522 unsigned keep_capabilities:1;
523 struct user_struct *user;
525 struct rlimit rlim[RLIM_NLIMITS];
526 unsigned short used_math;
528 /* file system info */
529 int link_count, total_link_count;
531 struct sysv_sem sysvsem;
532 /* CPU-specific state of this task */
533 struct thread_struct thread;
534 /* filesystem information */
535 struct fs_struct *fs;
536 /* open file information */
537 struct files_struct *files;
539 struct namespace *namespace;
540 /* signal handlers */
541 struct signal_struct *signal;
542 struct sighand_struct *sighand;
544 sigset_t blocked, real_blocked;
545 struct sigpending pending;
547 unsigned long sas_ss_sp;
549 int (*notifier)(void *priv);
551 sigset_t *notifier_mask;
554 struct audit_context *audit_context;
556 /* vserver context data */
558 struct vx_info *vx_info;
560 /* vserver network data */
562 struct nx_info *nx_info;
564 /* Thread group tracking */
567 /* Protection of (de-)allocation: mm, files, fs, tty */
568 spinlock_t alloc_lock;
569 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
570 spinlock_t proc_lock;
571 /* context-switch lock */
572 spinlock_t switch_lock;
574 /* journalling filesystem info */
578 struct reclaim_state *reclaim_state;
580 struct dentry *proc_dentry;
581 struct backing_dev_info *backing_dev_info;
583 struct io_context *io_context;
585 unsigned long ptrace_message;
586 siginfo_t *last_siginfo; /* For ptrace use. */
588 * current io wait handle: wait queue entry to use for io waits
589 * If this thread is processing aio, this points at the waitqueue
590 * inside the currently handled kiocb. It may be NULL (i.e. default
591 * to a stack based synchronous wait) if its doing sync IO.
593 wait_queue_t *io_wait;
595 struct mempolicy *mempolicy;
596 short il_next; /* could be shared with used_math */
600 static inline pid_t process_group(struct task_struct *tsk)
602 return tsk->signal->pgrp;
605 extern void free_task(struct task_struct *tsk);
606 extern void __put_task_struct(struct task_struct *tsk);
607 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
608 #define put_task_struct(tsk) \
609 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
614 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
615 /* Not implemented yet, only for 486*/
616 #define PF_STARTING 0x00000002 /* being created */
617 #define PF_EXITING 0x00000004 /* getting shut down */
618 #define PF_DEAD 0x00000008 /* Dead */
619 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
620 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
621 #define PF_DUMPCORE 0x00000200 /* dumped core */
622 #define PF_SIGNALED 0x00000400 /* killed by a signal */
623 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
624 #define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */
625 #define PF_FLUSHER 0x00002000 /* responsible for disk writeback */
627 #define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */
628 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
629 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
630 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
631 #define PF_KSWAPD 0x00040000 /* I am kswapd */
632 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
633 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
634 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
637 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
639 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
645 extern unsigned long long sched_clock(void);
647 /* sched_exec is called by processes performing an exec */
649 extern void sched_exec(void);
651 #define sched_exec() {}
654 extern void sched_idle_next(void);
655 extern void set_user_nice(task_t *p, long nice);
656 extern int task_prio(const task_t *p);
657 extern int task_nice(const task_t *p);
658 extern int task_curr(const task_t *p);
659 extern int idle_cpu(int cpu);
664 * The default (Linux) execution domain.
666 extern struct exec_domain default_exec_domain;
669 struct thread_info thread_info;
670 unsigned long stack[THREAD_SIZE/sizeof(long)];
673 #ifndef __HAVE_ARCH_KSTACK_END
674 static inline int kstack_end(void *addr)
676 /* Reliable end of stack detection:
677 * Some APM bios versions misalign the stack
679 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
683 extern union thread_union init_thread_union;
684 extern struct task_struct init_task;
686 extern struct mm_struct init_mm;
689 #define find_task_by_real_pid(nr) \
690 find_task_by_pid_type(PIDTYPE_PID, nr)
691 #define find_task_by_pid(nr) \
692 find_task_by_pid_type(PIDTYPE_PID, \
695 extern struct task_struct *find_task_by_pid_type(int type, int pid);
696 extern void set_special_pids(pid_t session, pid_t pgrp);
697 extern void __set_special_pids(pid_t session, pid_t pgrp);
699 /* per-UID process charging. */
700 extern struct user_struct * alloc_uid(xid_t, uid_t);
701 static inline struct user_struct *get_uid(struct user_struct *u)
703 atomic_inc(&u->__count);
706 extern void free_uid(struct user_struct *);
707 extern void switch_uid(struct user_struct *);
709 #include <asm/current.h>
711 extern unsigned long itimer_ticks;
712 extern unsigned long itimer_next;
713 extern void do_timer(struct pt_regs *);
715 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
716 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
717 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
718 unsigned long clone_flags));
720 extern void kick_process(struct task_struct *tsk);
722 static inline void kick_process(struct task_struct *tsk) { }
724 extern void FASTCALL(sched_fork(task_t * p));
725 extern void FASTCALL(sched_exit(task_t * p));
727 extern int in_group_p(gid_t);
728 extern int in_egroup_p(gid_t);
730 extern void proc_caches_init(void);
731 extern void flush_signals(struct task_struct *);
732 extern void flush_signal_handlers(struct task_struct *, int force_default);
733 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
735 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
740 spin_lock_irqsave(&tsk->sighand->siglock, flags);
741 ret = dequeue_signal(tsk, mask, info);
742 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
747 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
749 extern void unblock_all_signals(void);
750 extern void release_task(struct task_struct * p);
751 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
752 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
753 extern int force_sigsegv(int, struct task_struct *);
754 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
755 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
756 extern int kill_pg_info(int, struct siginfo *, pid_t);
757 extern int kill_sl_info(int, struct siginfo *, pid_t);
758 extern int kill_proc_info(int, struct siginfo *, pid_t);
759 extern void do_notify_parent(struct task_struct *, int);
760 extern void force_sig(int, struct task_struct *);
761 extern void force_sig_specific(int, struct task_struct *);
762 extern int send_sig(int, struct task_struct *, int);
763 extern void zap_other_threads(struct task_struct *p);
764 extern int kill_pg(pid_t, int, int);
765 extern int kill_sl(pid_t, int, int);
766 extern int kill_proc(pid_t, int, int);
767 extern struct sigqueue *sigqueue_alloc(void);
768 extern void sigqueue_free(struct sigqueue *);
769 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
770 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
771 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
772 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
774 /* These can be the second arg to send_sig_info/send_group_sig_info. */
775 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
776 #define SEND_SIG_PRIV ((struct siginfo *) 1)
777 #define SEND_SIG_FORCED ((struct siginfo *) 2)
779 /* True if we are on the alternate signal stack. */
781 static inline int on_sig_stack(unsigned long sp)
783 return (sp - current->sas_ss_sp < current->sas_ss_size);
786 static inline int sas_ss_flags(unsigned long sp)
788 return (current->sas_ss_size == 0 ? SS_DISABLE
789 : on_sig_stack(sp) ? SS_ONSTACK : 0);
793 #ifdef CONFIG_SECURITY
794 /* code is in security.c */
795 extern int capable(int cap);
797 static inline int capable(int cap)
799 if (cap_raised(current->cap_effective, cap)) {
800 current->flags |= PF_SUPERPRIV;
808 * Routines for handling mm_structs
810 extern struct mm_struct * mm_alloc(void);
812 /* mmdrop drops the mm and the page tables */
813 extern void FASTCALL(__mmdrop(struct mm_struct *));
814 static inline void mmdrop(struct mm_struct * mm)
816 if (atomic_dec_and_test(&mm->mm_count))
820 /* mmput gets rid of the mappings and all user-space */
821 extern void mmput(struct mm_struct *);
822 /* Grab a reference to a task's mm, if it is not already going away */
823 extern struct mm_struct *get_task_mm(struct task_struct *task);
824 /* Remove the current tasks stale references to the old mm_struct */
825 extern void mm_release(struct task_struct *, struct mm_struct *);
827 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
828 extern void flush_thread(void);
829 extern void exit_thread(void);
831 extern void exit_mm(struct task_struct *);
832 extern void exit_files(struct task_struct *);
833 extern void exit_signal(struct task_struct *);
834 extern void __exit_signal(struct task_struct *);
835 extern void exit_sighand(struct task_struct *);
836 extern void __exit_sighand(struct task_struct *);
837 extern void exit_itimers(struct signal_struct *);
839 extern NORET_TYPE void do_group_exit(int);
841 extern void reparent_to_init(void);
842 extern void daemonize(const char *, ...);
843 extern int allow_signal(int);
844 extern int disallow_signal(int);
845 extern task_t *child_reaper;
847 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
848 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
849 task_t *fork_idle(int);
851 extern void set_task_comm(struct task_struct *tsk, char *from);
852 extern void get_task_comm(char *to, struct task_struct *tsk);
855 extern void wait_task_inactive(task_t * p);
857 #define wait_task_inactive(p) do { } while (0)
860 #define remove_parent(p) list_del_init(&(p)->sibling)
861 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
863 #define REMOVE_LINKS(p) do { \
864 if (thread_group_leader(p)) \
865 list_del_init(&(p)->tasks); \
869 #define SET_LINKS(p) do { \
870 if (thread_group_leader(p)) \
871 list_add_tail(&(p)->tasks,&init_task.tasks); \
872 add_parent(p, (p)->parent); \
875 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
876 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
878 #define for_each_process(p) \
879 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
882 * Careful: do_each_thread/while_each_thread is a double loop so
883 * 'break' will not work as expected - use goto instead.
885 #define do_each_thread(g, t) \
886 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
888 #define while_each_thread(g, t) \
889 while ((t = next_thread(t)) != g)
891 extern task_t * FASTCALL(next_thread(const task_t *p));
893 #define thread_group_leader(p) (p->pid == p->tgid)
895 static inline int thread_group_empty(task_t *p)
897 return list_empty(&p->pids[PIDTYPE_TGID].pid_list);
900 #define delay_group_leader(p) \
901 (thread_group_leader(p) && !thread_group_empty(p))
903 extern void unhash_process(struct task_struct *p);
906 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm and
907 * synchronises with wait4().
909 * Nests both inside and outside of read_lock(&tasklist_lock).
910 * It must not be nested with write_lock_irq(&tasklist_lock),
911 * neither inside nor outside.
913 static inline void task_lock(struct task_struct *p)
915 spin_lock(&p->alloc_lock);
918 static inline void task_unlock(struct task_struct *p)
920 spin_unlock(&p->alloc_lock);
923 /* set thread flags in other task's structures
924 * - see asm/thread_info.h for TIF_xxxx flags available
926 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
928 set_ti_thread_flag(tsk->thread_info,flag);
931 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
933 clear_ti_thread_flag(tsk->thread_info,flag);
936 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
938 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
941 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
943 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
946 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
948 return test_ti_thread_flag(tsk->thread_info,flag);
951 static inline void set_tsk_need_resched(struct task_struct *tsk)
953 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
956 static inline void clear_tsk_need_resched(struct task_struct *tsk)
958 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
961 static inline int signal_pending(struct task_struct *p)
963 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
966 static inline int need_resched(void)
968 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
971 extern void __cond_resched(void);
972 static inline void cond_resched(void)
979 * cond_resched_lock() - if a reschedule is pending, drop the given lock,
980 * call schedule, and on return reacquire the lock.
982 * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
983 * operations here to prevent schedule() from being called twice (once via
984 * spin_unlock(), once by hand).
986 static inline void cond_resched_lock(spinlock_t * lock)
988 if (need_resched()) {
989 _raw_spin_unlock(lock);
990 preempt_enable_no_resched();
996 /* Reevaluate whether the task has signals pending delivery.
997 This is required every time the blocked sigset_t changes.
998 callers must hold sighand->siglock. */
1000 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
1001 extern void recalc_sigpending(void);
1003 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1006 * Wrappers for p->thread_info->cpu access. No-op on UP.
1010 static inline unsigned int task_cpu(const struct task_struct *p)
1012 return p->thread_info->cpu;
1015 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1017 p->thread_info->cpu = cpu;
1022 static inline unsigned int task_cpu(const struct task_struct *p)
1027 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1031 #endif /* CONFIG_SMP */
1033 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1034 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1036 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1038 mm->mmap_base = TASK_UNMAPPED_BASE;
1039 mm->get_unmapped_area = arch_get_unmapped_area;
1040 mm->unmap_area = arch_unmap_area;
1044 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1045 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1047 #endif /* __KERNEL__ */