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>
106 #define TASK_RUNNING 0
107 #define TASK_INTERRUPTIBLE 1
108 #define TASK_UNINTERRUPTIBLE 2
109 #define TASK_STOPPED 4
110 #define TASK_ZOMBIE 8
113 #define __set_task_state(tsk, state_value) \
114 do { (tsk)->state = (state_value); } while (0)
115 #define set_task_state(tsk, state_value) \
116 set_mb((tsk)->state, (state_value))
118 #define __set_current_state(state_value) \
119 do { current->state = (state_value); } while (0)
120 #define set_current_state(state_value) \
121 set_mb(current->state, (state_value))
124 * Scheduling policies
126 #define SCHED_NORMAL 0
136 #include <linux/spinlock.h>
139 * This serializes "schedule()" and also protects
140 * the run-queue from deletions/modifications (but
141 * _adding_ to the beginning of the run-queue has
144 extern rwlock_t tasklist_lock;
145 extern spinlock_t mmlist_lock;
147 typedef struct task_struct task_t;
149 extern void sched_init(void);
150 extern void init_idle(task_t *idle, int cpu);
152 extern cpumask_t idle_cpu_mask;
154 extern void show_state(void);
155 extern void show_regs(struct pt_regs *);
158 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
159 * task), SP is the stack pointer of the first frame that should be shown in the back
160 * trace (or NULL if the entire call-chain of the task should be shown).
162 extern void show_stack(struct task_struct *task, unsigned long *sp);
164 void io_schedule(void);
165 long io_schedule_timeout(long timeout);
167 extern void cpu_init (void);
168 extern void trap_init(void);
169 extern void update_process_times(int user);
170 extern void update_one_process(struct task_struct *p, unsigned long user,
171 unsigned long system, int cpu);
172 extern void scheduler_tick(int user_tick, int system);
173 extern unsigned long cache_decay_ticks;
174 extern const unsigned long scheduling_functions_start_here;
175 extern const unsigned long scheduling_functions_end_here;
178 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
179 extern signed long FASTCALL(schedule_timeout(signed long timeout));
180 asmlinkage void schedule(void);
184 /* Maximum number of active map areas.. This is a random (large) number */
185 #define DEFAULT_MAX_MAP_COUNT 65536
187 extern int sysctl_max_map_count;
189 #include <linux/aio.h>
192 struct vm_area_struct * mmap; /* list of VMAs */
193 struct rb_root mm_rb;
194 struct vm_area_struct * mmap_cache; /* last find_vma result */
195 unsigned long free_area_cache; /* first hole */
197 atomic_t mm_users; /* How many users with user space? */
198 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
199 int map_count; /* number of VMAs */
200 struct rw_semaphore mmap_sem;
201 spinlock_t page_table_lock; /* Protects task page tables and mm->rss */
203 struct list_head mmlist; /* List of all active mm's. These are globally strung
204 * together off init_mm.mmlist, and are protected
208 unsigned long start_code, end_code, start_data, end_data;
209 unsigned long start_brk, brk, start_stack;
210 unsigned long arg_start, arg_end, env_start, env_end;
211 unsigned long rss, total_vm, locked_vm;
212 unsigned long def_flags;
214 unsigned long saved_auxv[40]; /* for /proc/PID/auxv */
217 #ifdef CONFIG_HUGETLB_PAGE
220 cpumask_t cpu_vm_mask;
222 /* Architecture-specific MM context */
223 mm_context_t context;
225 /* coredumping support */
227 struct completion *core_startup_done, core_done;
230 rwlock_t ioctx_list_lock;
231 struct kioctx *ioctx_list;
233 struct kioctx default_kioctx;
236 extern int mmlist_nr;
238 struct sighand_struct {
240 struct k_sigaction action[_NSIG];
245 * NOTE! "signal_struct" does not have it's own
246 * locking, because a shared signal_struct always
247 * implies a shared sighand_struct, so locking
248 * sighand_struct is always a proper superset of
249 * the locking of signal_struct.
251 struct signal_struct {
254 /* current thread group signal load-balancing target: */
257 /* shared signal handling: */
258 struct sigpending shared_pending;
260 /* thread group exit support */
264 * - notify group_exit_task when ->count is equal to notify_count
265 * - everyone except group_exit_task is stopped during signal delivery
266 * of fatal signals, group_exit_task processes the signal.
268 struct task_struct *group_exit_task;
271 /* thread group stop support, overloads group_exit_code too */
272 int group_stop_count;
274 /* POSIX.1b Interval Timers */
275 struct list_head posix_timers;
277 /* job control IDs */
281 /* boolean value for session group leader */
284 struct tty_struct *tty; /* NULL if no tty */
288 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
289 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
290 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
291 * are inverted: lower p->prio value means higher priority.
293 * The MAX_RT_USER_PRIO value allows the actual maximum
294 * RT priority to be separate from the value exported to
295 * user-space. This allows kernel threads to set their
296 * priority to a value higher than any user task. Note:
297 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
300 #define MAX_USER_RT_PRIO 100
301 #define MAX_RT_PRIO MAX_USER_RT_PRIO
303 #define MAX_PRIO (MAX_RT_PRIO + 40)
305 #define rt_task(p) ((p)->prio < MAX_RT_PRIO)
308 * Some day this will be a full-fledged user tracking system..
311 atomic_t __count; /* reference count */
312 atomic_t processes; /* How many processes does this user have? */
313 atomic_t files; /* How many open files does this user have? */
315 /* Hash table maintenance information */
316 struct list_head uidhash_list;
320 extern struct user_struct *find_user(uid_t);
322 extern struct user_struct root_user;
323 #define INIT_USER (&root_user)
325 typedef struct prio_array prio_array_t;
326 struct backing_dev_info;
327 struct reclaim_state;
329 /* POSIX.1b interval timer structure. */
331 struct list_head list; /* free/ allocate list */
333 clockid_t it_clock; /* which timer type */
334 timer_t it_id; /* timer id */
335 int it_overrun; /* overrun on pending signal */
336 int it_overrun_last; /* overrun on last delivered signal */
337 int it_requeue_pending; /* waiting to requeue this timer */
338 int it_sigev_notify; /* notify word of sigevent struct */
339 int it_sigev_signo; /* signo word of sigevent struct */
340 sigval_t it_sigev_value; /* value word of sigevent struct */
341 unsigned long it_incr; /* interval specified in jiffies */
342 struct task_struct *it_process; /* process to send signal to */
343 struct timer_list it_timer;
344 struct sigqueue *sigq; /* signal queue entry. */
348 struct io_context; /* See blkdev.h */
349 void exit_io_context(void);
351 #define NGROUPS_SMALL 32
352 #define NGROUPS_PER_BLOCK ((int)(EXEC_PAGESIZE / sizeof(gid_t)))
356 gid_t small_block[NGROUPS_SMALL];
361 #define get_group_info(group_info) do { \
362 atomic_inc(&(group_info)->usage); \
365 #define put_group_info(group_info) do { \
366 if (atomic_dec_and_test(&(group_info)->usage)) \
367 groups_free(group_info); \
370 struct group_info *groups_alloc(int gidsetsize);
371 void groups_free(struct group_info *group_info);
372 int set_current_groups(struct group_info *group_info);
373 /* access the groups "array" with this macro */
374 #define GROUP_AT(gi, i) \
375 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
378 struct audit_context; /* See audit.c */
381 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
382 struct thread_info *thread_info;
384 unsigned long flags; /* per process flags, defined below */
385 unsigned long ptrace;
387 int lock_depth; /* Lock depth */
389 int prio, static_prio;
390 struct list_head run_list;
393 unsigned long sleep_avg;
394 long interactive_credit;
395 unsigned long long timestamp;
398 unsigned long policy;
399 cpumask_t cpus_allowed;
400 unsigned int time_slice, first_time_slice;
402 struct list_head tasks;
403 struct list_head ptrace_children;
404 struct list_head ptrace_list;
406 struct mm_struct *mm, *active_mm;
409 struct linux_binfmt *binfmt;
410 int exit_code, exit_signal;
411 int pdeath_signal; /* The signal sent when the parent dies */
413 unsigned long personality;
418 * pointers to (original) parent process, youngest child, younger sibling,
419 * older sibling, respectively. (p->father can be replaced with
422 struct task_struct *real_parent; /* real parent process (when being debugged) */
423 struct task_struct *parent; /* parent process */
424 struct list_head children; /* list of my children */
425 struct list_head sibling; /* linkage in my parent's children list */
426 struct task_struct *group_leader; /* threadgroup leader */
428 /* PID/PID hash table linkage. */
429 struct pid_link pids[PIDTYPE_MAX];
431 wait_queue_head_t wait_chldexit; /* for wait4() */
432 struct completion *vfork_done; /* for vfork() */
433 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
434 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
436 unsigned long rt_priority;
437 unsigned long it_real_value, it_prof_value, it_virt_value;
438 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
439 struct timer_list real_timer;
440 unsigned long utime, stime, cutime, cstime;
441 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; /* context switch counts */
443 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
444 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
445 /* process credentials */
446 uid_t uid,euid,suid,fsuid;
447 gid_t gid,egid,sgid,fsgid;
448 struct group_info *group_info;
449 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
450 int keep_capabilities:1;
451 struct user_struct *user;
453 struct rlimit rlim[RLIM_NLIMITS];
454 unsigned short used_math;
456 /* file system info */
457 int link_count, total_link_count;
459 struct sysv_sem sysvsem;
460 /* CPU-specific state of this task */
461 struct thread_struct thread;
462 /* filesystem information */
463 struct fs_struct *fs;
464 /* open file information */
465 struct files_struct *files;
467 struct namespace *namespace;
468 /* signal handlers */
469 struct signal_struct *signal;
470 struct sighand_struct *sighand;
472 sigset_t blocked, real_blocked;
473 struct sigpending pending;
475 unsigned long sas_ss_sp;
477 int (*notifier)(void *priv);
479 sigset_t *notifier_mask;
482 struct audit_context *audit_context;
484 /* Thread group tracking */
487 /* Protection of (de-)allocation: mm, files, fs, tty */
488 spinlock_t alloc_lock;
489 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
490 spinlock_t proc_lock;
491 /* context-switch lock */
492 spinlock_t switch_lock;
494 /* journalling filesystem info */
498 struct reclaim_state *reclaim_state;
500 struct dentry *proc_dentry;
501 struct backing_dev_info *backing_dev_info;
503 struct io_context *io_context;
505 unsigned long ptrace_message;
506 siginfo_t *last_siginfo; /* For ptrace use. */
509 static inline pid_t process_group(struct task_struct *tsk)
511 return tsk->signal->pgrp;
514 extern void __put_task_struct(struct task_struct *tsk);
515 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
516 #define put_task_struct(tsk) \
517 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
522 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
523 /* Not implemented yet, only for 486*/
524 #define PF_STARTING 0x00000002 /* being created */
525 #define PF_EXITING 0x00000004 /* getting shut down */
526 #define PF_DEAD 0x00000008 /* Dead */
527 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
528 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
529 #define PF_DUMPCORE 0x00000200 /* dumped core */
530 #define PF_SIGNALED 0x00000400 /* killed by a signal */
531 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
532 #define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */
533 #define PF_FLUSHER 0x00002000 /* responsible for disk writeback */
535 #define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */
536 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
537 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
538 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
539 #define PF_KSWAPD 0x00040000 /* I am kswapd */
540 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
541 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
542 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
545 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
547 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
553 extern unsigned long long sched_clock(void);
556 extern void sched_balance_exec(void);
557 extern void node_nr_running_init(void);
559 #define sched_balance_exec() {}
560 #define node_nr_running_init() {}
563 /* Move tasks off this (offline) CPU onto another. */
564 extern void migrate_all_tasks(void);
565 extern void set_user_nice(task_t *p, long nice);
566 extern int task_prio(task_t *p);
567 extern int task_nice(task_t *p);
568 extern int task_curr(task_t *p);
569 extern int idle_cpu(int cpu);
574 * The default (Linux) execution domain.
576 extern struct exec_domain default_exec_domain;
579 struct thread_info thread_info;
580 unsigned long stack[THREAD_SIZE/sizeof(long)];
583 #ifndef __HAVE_ARCH_KSTACK_END
584 static inline int kstack_end(void *addr)
586 /* Reliable end of stack detection:
587 * Some APM bios versions misalign the stack
589 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
593 extern union thread_union init_thread_union;
594 extern struct task_struct init_task;
596 extern struct mm_struct init_mm;
598 extern struct task_struct *find_task_by_pid(int pid);
599 extern void set_special_pids(pid_t session, pid_t pgrp);
600 extern void __set_special_pids(pid_t session, pid_t pgrp);
602 /* per-UID process charging. */
603 extern struct user_struct * alloc_uid(uid_t);
604 extern void free_uid(struct user_struct *);
605 extern void switch_uid(struct user_struct *);
607 #include <asm/current.h>
609 extern unsigned long itimer_ticks;
610 extern unsigned long itimer_next;
611 extern void do_timer(struct pt_regs *);
613 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
614 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
616 extern void kick_process(struct task_struct *tsk);
618 static inline void kick_process(struct task_struct *tsk) { }
620 extern void FASTCALL(wake_up_forked_process(struct task_struct * tsk));
621 extern void FASTCALL(sched_fork(task_t * p));
622 extern void FASTCALL(sched_exit(task_t * p));
624 extern int in_group_p(gid_t);
625 extern int in_egroup_p(gid_t);
627 extern void proc_caches_init(void);
628 extern void flush_signals(struct task_struct *);
629 extern void flush_signal_handlers(struct task_struct *, int force_default);
630 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
632 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
637 spin_lock_irqsave(&tsk->sighand->siglock, flags);
638 ret = dequeue_signal(tsk, mask, info);
639 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
644 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
646 extern void unblock_all_signals(void);
647 extern void release_task(struct task_struct * p);
648 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
649 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
650 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
651 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
652 extern int kill_pg_info(int, struct siginfo *, pid_t);
653 extern int kill_sl_info(int, struct siginfo *, pid_t);
654 extern int kill_proc_info(int, struct siginfo *, pid_t);
655 extern void notify_parent(struct task_struct *, int);
656 extern void do_notify_parent(struct task_struct *, int);
657 extern void force_sig(int, struct task_struct *);
658 extern void force_sig_specific(int, struct task_struct *);
659 extern int send_sig(int, struct task_struct *, int);
660 extern void zap_other_threads(struct task_struct *p);
661 extern int kill_pg(pid_t, int, int);
662 extern int kill_sl(pid_t, int, int);
663 extern int kill_proc(pid_t, int, int);
664 extern struct sigqueue *sigqueue_alloc(void);
665 extern void sigqueue_free(struct sigqueue *);
666 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
667 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
668 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
669 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
671 /* These can be the second arg to send_sig_info/send_group_sig_info. */
672 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
673 #define SEND_SIG_PRIV ((struct siginfo *) 1)
674 #define SEND_SIG_FORCED ((struct siginfo *) 2)
676 /* True if we are on the alternate signal stack. */
678 static inline int on_sig_stack(unsigned long sp)
680 return (sp - current->sas_ss_sp < current->sas_ss_size);
683 static inline int sas_ss_flags(unsigned long sp)
685 return (current->sas_ss_size == 0 ? SS_DISABLE
686 : on_sig_stack(sp) ? SS_ONSTACK : 0);
690 #ifdef CONFIG_SECURITY
691 /* code is in security.c */
692 extern int capable(int cap);
694 static inline int capable(int cap)
696 if (cap_raised(current->cap_effective, cap)) {
697 current->flags |= PF_SUPERPRIV;
705 * Routines for handling mm_structs
707 extern struct mm_struct * mm_alloc(void);
709 /* mmdrop drops the mm and the page tables */
710 extern void FASTCALL(__mmdrop(struct mm_struct *));
711 static inline void mmdrop(struct mm_struct * mm)
713 if (atomic_dec_and_test(&mm->mm_count))
717 /* mmput gets rid of the mappings and all user-space */
718 extern void mmput(struct mm_struct *);
719 /* Grab a reference to the mm if its not already going away */
720 extern struct mm_struct *mmgrab(struct mm_struct *);
721 /* Remove the current tasks stale references to the old mm_struct */
722 extern void mm_release(struct task_struct *, struct mm_struct *);
724 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
725 extern void flush_thread(void);
726 extern void exit_thread(void);
728 extern void exit_mm(struct task_struct *);
729 extern void exit_files(struct task_struct *);
730 extern void exit_signal(struct task_struct *);
731 extern void __exit_signal(struct task_struct *);
732 extern void exit_sighand(struct task_struct *);
733 extern void __exit_sighand(struct task_struct *);
734 extern void exit_itimers(struct signal_struct *);
736 extern NORET_TYPE void do_group_exit(int);
738 extern void reparent_to_init(void);
739 extern void daemonize(const char *, ...);
740 extern int allow_signal(int);
741 extern int disallow_signal(int);
742 extern task_t *child_reaper;
744 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
745 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
746 extern struct task_struct * copy_process(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
749 extern void wait_task_inactive(task_t * p);
751 #define wait_task_inactive(p) do { } while (0)
754 #define remove_parent(p) list_del_init(&(p)->sibling)
755 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
757 #define REMOVE_LINKS(p) do { \
758 if (thread_group_leader(p)) \
759 list_del_init(&(p)->tasks); \
763 #define SET_LINKS(p) do { \
764 if (thread_group_leader(p)) \
765 list_add_tail(&(p)->tasks,&init_task.tasks); \
766 add_parent(p, (p)->parent); \
769 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
770 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
772 #define for_each_process(p) \
773 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
776 * Careful: do_each_thread/while_each_thread is a double loop so
777 * 'break' will not work as expected - use goto instead.
779 #define do_each_thread(g, t) \
780 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
782 #define while_each_thread(g, t) \
783 while ((t = next_thread(t)) != g)
785 extern task_t * FASTCALL(next_thread(task_t *p));
787 #define thread_group_leader(p) (p->pid == p->tgid)
789 static inline int thread_group_empty(task_t *p)
791 struct pid *pid = p->pids[PIDTYPE_TGID].pidptr;
793 return pid->task_list.next->next == &pid->task_list;
796 #define delay_group_leader(p) \
797 (thread_group_leader(p) && !thread_group_empty(p))
799 extern void unhash_process(struct task_struct *p);
802 * Protects ->fs, ->files, ->mm, ->ptrace and synchronises with wait4().
803 * Nests both inside and outside of read_lock(&tasklist_lock).
804 * It must not be nested with write_lock_irq(&tasklist_lock),
805 * neither inside nor outside.
807 static inline void task_lock(struct task_struct *p)
809 spin_lock(&p->alloc_lock);
812 static inline void task_unlock(struct task_struct *p)
814 spin_unlock(&p->alloc_lock);
818 * get_task_mm - acquire a reference to the task's mm
820 * Returns %NULL if the task has no mm. User must release
821 * the mm via mmput() after use.
823 static inline struct mm_struct * get_task_mm(struct task_struct * task)
825 struct mm_struct * mm;
837 /* set thread flags in other task's structures
838 * - see asm/thread_info.h for TIF_xxxx flags available
840 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
842 set_ti_thread_flag(tsk->thread_info,flag);
845 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
847 clear_ti_thread_flag(tsk->thread_info,flag);
850 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
852 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
855 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
857 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
860 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
862 return test_ti_thread_flag(tsk->thread_info,flag);
865 static inline void set_tsk_need_resched(struct task_struct *tsk)
867 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
870 static inline void clear_tsk_need_resched(struct task_struct *tsk)
872 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
875 static inline int signal_pending(struct task_struct *p)
877 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
880 static inline int need_resched(void)
882 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
885 extern void __cond_resched(void);
886 static inline void cond_resched(void)
893 * cond_resched_lock() - if a reschedule is pending, drop the given lock,
894 * call schedule, and on return reacquire the lock.
896 * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
897 * operations here to prevent schedule() from being called twice (once via
898 * spin_unlock(), once by hand).
900 static inline void cond_resched_lock(spinlock_t * lock)
902 if (need_resched()) {
903 _raw_spin_unlock(lock);
904 preempt_enable_no_resched();
910 /* Reevaluate whether the task has signals pending delivery.
911 This is required every time the blocked sigset_t changes.
912 callers must hold sighand->siglock. */
914 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
915 extern void recalc_sigpending(void);
917 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
920 * Wrappers for p->thread_info->cpu access. No-op on UP.
924 static inline unsigned int task_cpu(struct task_struct *p)
926 return p->thread_info->cpu;
929 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
931 p->thread_info->cpu = cpu;
936 static inline unsigned int task_cpu(struct task_struct *p)
941 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
945 #endif /* CONFIG_SMP */
947 #endif /* __KERNEL__ */