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 init_idle(task_t *idle, int cpu);
154 extern cpumask_t idle_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 update_one_process(struct task_struct *p, unsigned long user,
173 unsigned long system, int cpu);
174 extern void scheduler_tick(int user_tick, int system);
175 extern unsigned long cache_decay_ticks;
176 extern const unsigned long scheduling_functions_start_here;
177 extern const unsigned long scheduling_functions_end_here;
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 struct vm_area_struct * mmap; /* list of VMAs */
195 struct rb_root mm_rb;
196 struct vm_area_struct * mmap_cache; /* last find_vma result */
197 unsigned long free_area_cache; /* first hole */
199 atomic_t mm_users; /* How many users with user space? */
200 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
201 int map_count; /* number of VMAs */
202 struct rw_semaphore mmap_sem;
203 spinlock_t page_table_lock; /* Protects task page tables and mm->rss */
205 struct list_head mmlist; /* List of all active mm's. These are globally strung
206 * together off init_mm.mmlist, and are protected
210 unsigned long start_code, end_code, start_data, end_data;
211 unsigned long start_brk, brk, start_stack;
212 unsigned long arg_start, arg_end, env_start, env_end;
213 unsigned long rss, total_vm, locked_vm;
214 unsigned long def_flags;
216 unsigned long saved_auxv[40]; /* for /proc/PID/auxv */
219 #ifdef CONFIG_HUGETLB_PAGE
222 cpumask_t cpu_vm_mask;
224 /* Architecture-specific MM context */
225 mm_context_t context;
226 struct vx_info *mm_vx_info;
228 /* coredumping support */
230 struct completion *core_startup_done, core_done;
233 rwlock_t ioctx_list_lock;
234 struct kioctx *ioctx_list;
236 struct kioctx default_kioctx;
239 extern int mmlist_nr;
241 struct sighand_struct {
243 struct k_sigaction action[_NSIG];
248 * NOTE! "signal_struct" does not have it's own
249 * locking, because a shared signal_struct always
250 * implies a shared sighand_struct, so locking
251 * sighand_struct is always a proper superset of
252 * the locking of signal_struct.
254 struct signal_struct {
257 /* current thread group signal load-balancing target: */
260 /* shared signal handling: */
261 struct sigpending shared_pending;
263 /* thread group exit support */
267 * - notify group_exit_task when ->count is equal to notify_count
268 * - everyone except group_exit_task is stopped during signal delivery
269 * of fatal signals, group_exit_task processes the signal.
271 struct task_struct *group_exit_task;
274 /* thread group stop support, overloads group_exit_code too */
275 int group_stop_count;
277 /* POSIX.1b Interval Timers */
278 struct list_head posix_timers;
280 /* job control IDs */
284 /* boolean value for session group leader */
287 struct tty_struct *tty; /* NULL if no tty */
291 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
292 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
293 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
294 * are inverted: lower p->prio value means higher priority.
296 * The MAX_RT_USER_PRIO value allows the actual maximum
297 * RT priority to be separate from the value exported to
298 * user-space. This allows kernel threads to set their
299 * priority to a value higher than any user task. Note:
300 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
303 #define MAX_USER_RT_PRIO 100
304 #define MAX_RT_PRIO MAX_USER_RT_PRIO
306 #define MAX_PRIO (MAX_RT_PRIO + 40)
308 #define rt_task(p) ((p)->prio < MAX_RT_PRIO)
311 * Some day this will be a full-fledged user tracking system..
314 atomic_t __count; /* reference count */
315 atomic_t processes; /* How many processes does this user have? */
316 atomic_t files; /* How many open files does this user have? */
318 /* Hash table maintenance information */
319 struct list_head uidhash_list;
324 extern struct user_struct *find_user(xid_t, uid_t);
326 extern struct user_struct root_user;
327 #define INIT_USER (&root_user)
329 typedef struct prio_array prio_array_t;
330 struct backing_dev_info;
331 struct reclaim_state;
333 /* POSIX.1b interval timer structure. */
335 struct list_head list; /* free/ allocate list */
337 clockid_t it_clock; /* which timer type */
338 timer_t it_id; /* timer id */
339 int it_overrun; /* overrun on pending signal */
340 int it_overrun_last; /* overrun on last delivered signal */
341 int it_requeue_pending; /* waiting to requeue this timer */
342 int it_sigev_notify; /* notify word of sigevent struct */
343 int it_sigev_signo; /* signo word of sigevent struct */
344 sigval_t it_sigev_value; /* value word of sigevent struct */
345 unsigned long it_incr; /* interval specified in jiffies */
346 struct task_struct *it_process; /* process to send signal to */
347 struct timer_list it_timer;
348 struct sigqueue *sigq; /* signal queue entry. */
352 struct io_context; /* See blkdev.h */
353 void exit_io_context(void);
355 #define NGROUPS_SMALL 32
356 #define NGROUPS_PER_BLOCK ((int)(EXEC_PAGESIZE / sizeof(gid_t)))
360 gid_t small_block[NGROUPS_SMALL];
365 #define get_group_info(group_info) do { \
366 atomic_inc(&(group_info)->usage); \
369 #define put_group_info(group_info) do { \
370 if (atomic_dec_and_test(&(group_info)->usage)) \
371 groups_free(group_info); \
374 struct group_info *groups_alloc(int gidsetsize);
375 void groups_free(struct group_info *group_info);
376 int set_current_groups(struct group_info *group_info);
377 /* access the groups "array" with this macro */
378 #define GROUP_AT(gi, i) \
379 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
382 struct audit_context; /* See audit.c */
385 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
386 struct thread_info *thread_info;
388 unsigned long flags; /* per process flags, defined below */
389 unsigned long ptrace;
391 int lock_depth; /* Lock depth */
393 int prio, static_prio;
394 struct list_head run_list;
397 unsigned long sleep_avg;
398 long interactive_credit;
399 unsigned long long timestamp;
402 unsigned long policy;
403 cpumask_t cpus_allowed;
404 unsigned int time_slice, first_time_slice;
406 struct list_head tasks;
407 struct list_head ptrace_children;
408 struct list_head ptrace_list;
410 struct mm_struct *mm, *active_mm;
413 struct linux_binfmt *binfmt;
414 int exit_code, exit_signal;
415 int pdeath_signal; /* The signal sent when the parent dies */
417 unsigned long personality;
422 * pointers to (original) parent process, youngest child, younger sibling,
423 * older sibling, respectively. (p->father can be replaced with
426 struct task_struct *real_parent; /* real parent process (when being debugged) */
427 struct task_struct *parent; /* parent process */
428 struct list_head children; /* list of my children */
429 struct list_head sibling; /* linkage in my parent's children list */
430 struct task_struct *group_leader; /* threadgroup leader */
432 /* PID/PID hash table linkage. */
433 struct pid_link pids[PIDTYPE_MAX];
435 wait_queue_head_t wait_chldexit; /* for wait4() */
436 struct completion *vfork_done; /* for vfork() */
437 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
438 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
440 unsigned long rt_priority;
441 unsigned long it_real_value, it_prof_value, it_virt_value;
442 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
443 struct timer_list real_timer;
444 unsigned long utime, stime, cutime, cstime;
445 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; /* context switch counts */
447 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
448 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
449 /* process credentials */
450 uid_t uid,euid,suid,fsuid;
451 gid_t gid,egid,sgid,fsgid;
452 struct group_info *group_info;
453 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
454 int keep_capabilities:1;
455 struct user_struct *user;
457 struct rlimit rlim[RLIM_NLIMITS];
458 unsigned short used_math;
460 /* file system info */
461 int link_count, total_link_count;
463 struct sysv_sem sysvsem;
464 /* CPU-specific state of this task */
465 struct thread_struct thread;
466 /* filesystem information */
467 struct fs_struct *fs;
468 /* open file information */
469 struct files_struct *files;
471 struct namespace *namespace;
472 /* signal handlers */
473 struct signal_struct *signal;
474 struct sighand_struct *sighand;
476 sigset_t blocked, real_blocked;
477 struct sigpending pending;
479 unsigned long sas_ss_sp;
481 int (*notifier)(void *priv);
483 sigset_t *notifier_mask;
486 struct audit_context *audit_context;
488 /* vserver context data */
490 struct vx_info *vx_info;
492 /* vserver network data */
494 struct nx_info *nx_info;
496 /* Thread group tracking */
499 /* Protection of (de-)allocation: mm, files, fs, tty */
500 spinlock_t alloc_lock;
501 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
502 spinlock_t proc_lock;
503 /* context-switch lock */
504 spinlock_t switch_lock;
506 /* journalling filesystem info */
510 struct reclaim_state *reclaim_state;
512 struct dentry *proc_dentry;
513 struct backing_dev_info *backing_dev_info;
515 struct io_context *io_context;
517 unsigned long ptrace_message;
518 siginfo_t *last_siginfo; /* For ptrace use. */
521 static inline pid_t process_group(struct task_struct *tsk)
523 return tsk->signal->pgrp;
526 extern void __put_task_struct(struct task_struct *tsk);
527 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
528 #define put_task_struct(tsk) \
529 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
534 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
535 /* Not implemented yet, only for 486*/
536 #define PF_STARTING 0x00000002 /* being created */
537 #define PF_EXITING 0x00000004 /* getting shut down */
538 #define PF_DEAD 0x00000008 /* Dead */
539 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
540 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
541 #define PF_DUMPCORE 0x00000200 /* dumped core */
542 #define PF_SIGNALED 0x00000400 /* killed by a signal */
543 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
544 #define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */
545 #define PF_FLUSHER 0x00002000 /* responsible for disk writeback */
547 #define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */
548 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
549 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
550 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
551 #define PF_KSWAPD 0x00040000 /* I am kswapd */
552 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
553 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
554 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
557 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
559 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
565 extern unsigned long long sched_clock(void);
568 extern void sched_balance_exec(void);
569 extern void node_nr_running_init(void);
571 #define sched_balance_exec() {}
572 #define node_nr_running_init() {}
575 /* Move tasks off this (offline) CPU onto another. */
576 extern void migrate_all_tasks(void);
577 extern void set_user_nice(task_t *p, long nice);
578 extern int task_prio(task_t *p);
579 extern int task_nice(task_t *p);
580 extern int task_curr(task_t *p);
581 extern int idle_cpu(int cpu);
586 * The default (Linux) execution domain.
588 extern struct exec_domain default_exec_domain;
591 struct thread_info thread_info;
592 unsigned long stack[THREAD_SIZE/sizeof(long)];
595 #ifndef __HAVE_ARCH_KSTACK_END
596 static inline int kstack_end(void *addr)
598 /* Reliable end of stack detection:
599 * Some APM bios versions misalign the stack
601 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
605 extern union thread_union init_thread_union;
606 extern struct task_struct init_task;
608 extern struct mm_struct init_mm;
610 extern struct task_struct *find_task_by_pid(int pid);
611 extern void set_special_pids(pid_t session, pid_t pgrp);
612 extern void __set_special_pids(pid_t session, pid_t pgrp);
614 /* per-UID process charging. */
615 extern struct user_struct * alloc_uid(xid_t, uid_t);
616 extern void free_uid(struct user_struct *);
617 extern void switch_uid(struct user_struct *);
619 #include <asm/current.h>
621 extern unsigned long itimer_ticks;
622 extern unsigned long itimer_next;
623 extern void do_timer(struct pt_regs *);
625 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
626 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
628 extern void kick_process(struct task_struct *tsk);
630 static inline void kick_process(struct task_struct *tsk) { }
632 extern void FASTCALL(wake_up_forked_process(struct task_struct * tsk));
633 extern void FASTCALL(sched_fork(task_t * p));
634 extern void FASTCALL(sched_exit(task_t * p));
636 extern int in_group_p(gid_t);
637 extern int in_egroup_p(gid_t);
639 extern void proc_caches_init(void);
640 extern void flush_signals(struct task_struct *);
641 extern void flush_signal_handlers(struct task_struct *, int force_default);
642 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
644 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
649 spin_lock_irqsave(&tsk->sighand->siglock, flags);
650 ret = dequeue_signal(tsk, mask, info);
651 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
656 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
658 extern void unblock_all_signals(void);
659 extern void release_task(struct task_struct * p);
660 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
661 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
662 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
663 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
664 extern int kill_pg_info(int, struct siginfo *, pid_t);
665 extern int kill_sl_info(int, struct siginfo *, pid_t);
666 extern int kill_proc_info(int, struct siginfo *, pid_t);
667 extern void notify_parent(struct task_struct *, int);
668 extern void do_notify_parent(struct task_struct *, int);
669 extern void force_sig(int, struct task_struct *);
670 extern void force_sig_specific(int, struct task_struct *);
671 extern int send_sig(int, struct task_struct *, int);
672 extern void zap_other_threads(struct task_struct *p);
673 extern int kill_pg(pid_t, int, int);
674 extern int kill_sl(pid_t, int, int);
675 extern int kill_proc(pid_t, int, int);
676 extern struct sigqueue *sigqueue_alloc(void);
677 extern void sigqueue_free(struct sigqueue *);
678 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
679 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
680 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
681 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
683 /* These can be the second arg to send_sig_info/send_group_sig_info. */
684 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
685 #define SEND_SIG_PRIV ((struct siginfo *) 1)
686 #define SEND_SIG_FORCED ((struct siginfo *) 2)
688 /* True if we are on the alternate signal stack. */
690 static inline int on_sig_stack(unsigned long sp)
692 return (sp - current->sas_ss_sp < current->sas_ss_size);
695 static inline int sas_ss_flags(unsigned long sp)
697 return (current->sas_ss_size == 0 ? SS_DISABLE
698 : on_sig_stack(sp) ? SS_ONSTACK : 0);
702 #ifdef CONFIG_SECURITY
703 /* code is in security.c */
704 extern int capable(int cap);
706 static inline int capable(int cap)
708 if (cap_raised(current->cap_effective, cap)) {
709 current->flags |= PF_SUPERPRIV;
717 * Routines for handling mm_structs
719 extern struct mm_struct * mm_alloc(void);
721 /* mmdrop drops the mm and the page tables */
722 extern void FASTCALL(__mmdrop(struct mm_struct *));
723 static inline void mmdrop(struct mm_struct * mm)
725 if (atomic_dec_and_test(&mm->mm_count))
729 /* mmput gets rid of the mappings and all user-space */
730 extern void mmput(struct mm_struct *);
731 /* Grab a reference to the mm if its not already going away */
732 extern struct mm_struct *mmgrab(struct mm_struct *);
733 /* Remove the current tasks stale references to the old mm_struct */
734 extern void mm_release(struct task_struct *, struct mm_struct *);
736 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
737 extern void flush_thread(void);
738 extern void exit_thread(void);
740 extern void exit_mm(struct task_struct *);
741 extern void exit_files(struct task_struct *);
742 extern void exit_signal(struct task_struct *);
743 extern void __exit_signal(struct task_struct *);
744 extern void exit_sighand(struct task_struct *);
745 extern void __exit_sighand(struct task_struct *);
746 extern void exit_itimers(struct signal_struct *);
748 extern NORET_TYPE void do_group_exit(int);
750 extern void reparent_to_init(void);
751 extern void daemonize(const char *, ...);
752 extern int allow_signal(int);
753 extern int disallow_signal(int);
754 extern task_t *child_reaper;
756 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
757 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
758 extern struct task_struct * copy_process(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
761 extern void wait_task_inactive(task_t * p);
763 #define wait_task_inactive(p) do { } while (0)
766 #define remove_parent(p) list_del_init(&(p)->sibling)
767 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
769 #define REMOVE_LINKS(p) do { \
770 if (thread_group_leader(p)) \
771 list_del_init(&(p)->tasks); \
775 #define SET_LINKS(p) do { \
776 if (thread_group_leader(p)) \
777 list_add_tail(&(p)->tasks,&init_task.tasks); \
778 add_parent(p, (p)->parent); \
781 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
782 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
784 #define for_each_process(p) \
785 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
788 * Careful: do_each_thread/while_each_thread is a double loop so
789 * 'break' will not work as expected - use goto instead.
791 #define do_each_thread(g, t) \
792 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
794 #define while_each_thread(g, t) \
795 while ((t = next_thread(t)) != g)
797 extern task_t * FASTCALL(next_thread(task_t *p));
799 #define thread_group_leader(p) (p->pid == p->tgid)
801 static inline int thread_group_empty(task_t *p)
803 struct pid *pid = p->pids[PIDTYPE_TGID].pidptr;
805 return pid->task_list.next->next == &pid->task_list;
808 #define delay_group_leader(p) \
809 (thread_group_leader(p) && !thread_group_empty(p))
811 extern void unhash_process(struct task_struct *p);
814 * Protects ->fs, ->files, ->mm, ->ptrace and synchronises with wait4().
815 * Nests both inside and outside of read_lock(&tasklist_lock).
816 * It must not be nested with write_lock_irq(&tasklist_lock),
817 * neither inside nor outside.
819 static inline void task_lock(struct task_struct *p)
821 spin_lock(&p->alloc_lock);
824 static inline void task_unlock(struct task_struct *p)
826 spin_unlock(&p->alloc_lock);
830 * get_task_mm - acquire a reference to the task's mm
832 * Returns %NULL if the task has no mm. User must release
833 * the mm via mmput() after use.
835 static inline struct mm_struct * get_task_mm(struct task_struct * task)
837 struct mm_struct * mm;
849 /* set thread flags in other task's structures
850 * - see asm/thread_info.h for TIF_xxxx flags available
852 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
854 set_ti_thread_flag(tsk->thread_info,flag);
857 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
859 clear_ti_thread_flag(tsk->thread_info,flag);
862 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
864 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
867 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
869 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
872 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
874 return test_ti_thread_flag(tsk->thread_info,flag);
877 static inline void set_tsk_need_resched(struct task_struct *tsk)
879 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
882 static inline void clear_tsk_need_resched(struct task_struct *tsk)
884 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
887 static inline int signal_pending(struct task_struct *p)
889 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
892 static inline int need_resched(void)
894 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
897 extern void __cond_resched(void);
898 static inline void cond_resched(void)
905 * cond_resched_lock() - if a reschedule is pending, drop the given lock,
906 * call schedule, and on return reacquire the lock.
908 * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
909 * operations here to prevent schedule() from being called twice (once via
910 * spin_unlock(), once by hand).
912 static inline void cond_resched_lock(spinlock_t * lock)
914 if (need_resched()) {
915 _raw_spin_unlock(lock);
916 preempt_enable_no_resched();
922 /* Reevaluate whether the task has signals pending delivery.
923 This is required every time the blocked sigset_t changes.
924 callers must hold sighand->siglock. */
926 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
927 extern void recalc_sigpending(void);
929 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
932 * Wrappers for p->thread_info->cpu access. No-op on UP.
936 static inline unsigned int task_cpu(struct task_struct *p)
938 return p->thread_info->cpu;
941 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
943 p->thread_info->cpu = cpu;
948 static inline unsigned int task_cpu(struct task_struct *p)
953 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
957 #endif /* CONFIG_SMP */
959 #endif /* __KERNEL__ */