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>
32 #include <linux/topology.h>
39 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
40 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
41 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
42 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
43 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
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_TRACED 8
111 #define EXIT_ZOMBIE 16
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 page tables, mm->rss, mm->anon_rss */
221 struct list_head mmlist; /* List of maybe swapped 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, anon_rss, total_vm, locked_vm, shared_vm;
230 unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes;
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;
240 /* Token based thrashing protection. */
241 unsigned long swap_token_time;
244 /* coredumping support */
246 struct completion *core_startup_done, core_done;
249 rwlock_t ioctx_list_lock;
250 struct kioctx *ioctx_list;
252 struct kioctx default_kioctx;
255 struct sighand_struct {
257 struct k_sigaction action[_NSIG];
262 * NOTE! "signal_struct" does not have it's own
263 * locking, because a shared signal_struct always
264 * implies a shared sighand_struct, so locking
265 * sighand_struct is always a proper superset of
266 * the locking of signal_struct.
268 struct signal_struct {
272 /* current thread group signal load-balancing target: */
275 /* shared signal handling: */
276 struct sigpending shared_pending;
278 /* thread group exit support */
282 * - notify group_exit_task when ->count is equal to notify_count
283 * - everyone except group_exit_task is stopped during signal delivery
284 * of fatal signals, group_exit_task processes the signal.
286 struct task_struct *group_exit_task;
289 /* thread group stop support, overloads group_exit_code too */
290 int group_stop_count;
291 /* 1 if group stopped since last SIGCONT, -1 if SIGCONT since report */
294 /* POSIX.1b Interval Timers */
295 struct list_head posix_timers;
297 /* job control IDs */
301 /* boolean value for session group leader */
304 struct tty_struct *tty; /* NULL if no tty */
307 * Cumulative resource counters for dead threads in the group,
308 * and for reaped dead child processes forked by this group.
309 * Live threads maintain their own counters and add to these
310 * in __exit_signal, except for the group leader.
312 unsigned long utime, stime, cutime, cstime;
313 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
314 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
317 * We don't bother to synchronize most readers of this at all,
318 * because there is no reader checking a limit that actually needs
319 * to get both rlim_cur and rlim_max atomically, and either one
320 * alone is a single word that can safely be read normally.
321 * getrlimit/setrlimit use task_lock(current->group_leader) to
322 * protect this instead of the siglock, because they really
323 * have no need to disable irqs.
325 struct rlimit rlim[RLIM_NLIMITS];
329 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
330 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
331 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
332 * are inverted: lower p->prio value means higher priority.
334 * The MAX_USER_RT_PRIO value allows the actual maximum
335 * RT priority to be separate from the value exported to
336 * user-space. This allows kernel threads to set their
337 * priority to a value higher than any user task. Note:
338 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
341 #define MAX_USER_RT_PRIO 100
342 #define MAX_RT_PRIO MAX_USER_RT_PRIO
344 #define MAX_PRIO (MAX_RT_PRIO + 40)
346 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
349 * Some day this will be a full-fledged user tracking system..
352 atomic_t __count; /* reference count */
353 atomic_t processes; /* How many processes does this user have? */
354 atomic_t files; /* How many open files does this user have? */
355 atomic_t sigpending; /* How many pending signals does this user have? */
356 /* protected by mq_lock */
357 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
358 unsigned long locked_shm; /* How many pages of mlocked shm ? */
361 struct key *uid_keyring; /* UID specific keyring */
362 struct key *session_keyring; /* UID's default session keyring */
365 /* Hash table maintenance information */
366 struct list_head uidhash_list;
370 extern struct user_struct *find_user(uid_t);
372 extern struct user_struct root_user;
373 #define INIT_USER (&root_user)
375 typedef struct prio_array prio_array_t;
376 struct backing_dev_info;
377 struct reclaim_state;
379 #ifdef CONFIG_SCHEDSTATS
381 /* cumulative counters */
382 unsigned long cpu_time, /* time spent on the cpu */
383 run_delay, /* time spent waiting on a runqueue */
384 pcnt; /* # of timeslices run on this cpu */
387 unsigned long last_arrival, /* when we last ran on a cpu */
388 last_queued; /* when we were last queued to run */
391 extern struct file_operations proc_schedstat_operations;
403 * sched-domains (multiprocessor balancing) declarations:
406 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
408 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
409 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
410 #define SD_BALANCE_EXEC 4 /* Balance on exec */
411 #define SD_WAKE_IDLE 8 /* Wake to idle CPU on task wakeup */
412 #define SD_WAKE_AFFINE 16 /* Wake task to waking CPU */
413 #define SD_WAKE_BALANCE 32 /* Perform balancing at task wakeup */
414 #define SD_SHARE_CPUPOWER 64 /* Domain members share cpu power */
417 struct sched_group *next; /* Must be a circular list */
421 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
422 * single CPU. This is read only (except for setup, hotplug CPU).
424 unsigned long cpu_power;
427 struct sched_domain {
428 /* These fields must be setup */
429 struct sched_domain *parent; /* top domain must be null terminated */
430 struct sched_group *groups; /* the balancing groups of the domain */
431 cpumask_t span; /* span of all CPUs in this domain */
432 unsigned long min_interval; /* Minimum balance interval ms */
433 unsigned long max_interval; /* Maximum balance interval ms */
434 unsigned int busy_factor; /* less balancing by factor if busy */
435 unsigned int imbalance_pct; /* No balance until over watermark */
436 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
437 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
438 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
439 int flags; /* See SD_* */
441 /* Runtime fields. */
442 unsigned long last_balance; /* init to jiffies. units in jiffies */
443 unsigned int balance_interval; /* initialise to 1. units in ms. */
444 unsigned int nr_balance_failed; /* initialise to 0 */
446 #ifdef CONFIG_SCHEDSTATS
447 /* load_balance() stats */
448 unsigned long lb_cnt[MAX_IDLE_TYPES];
449 unsigned long lb_failed[MAX_IDLE_TYPES];
450 unsigned long lb_imbalance[MAX_IDLE_TYPES];
451 unsigned long lb_nobusyg[MAX_IDLE_TYPES];
452 unsigned long lb_nobusyq[MAX_IDLE_TYPES];
454 /* sched_balance_exec() stats */
455 unsigned long sbe_attempts;
456 unsigned long sbe_pushed;
458 /* try_to_wake_up() stats */
459 unsigned long ttwu_wake_affine;
460 unsigned long ttwu_wake_balance;
464 #ifdef ARCH_HAS_SCHED_DOMAIN
465 /* Useful helpers that arch setup code may use. Defined in kernel/sched.c */
466 extern cpumask_t cpu_isolated_map;
467 extern void init_sched_build_groups(struct sched_group groups[],
468 cpumask_t span, int (*group_fn)(int cpu));
469 extern void cpu_attach_domain(struct sched_domain *sd, int cpu);
470 #endif /* ARCH_HAS_SCHED_DOMAIN */
471 #endif /* CONFIG_SMP */
474 struct io_context; /* See blkdev.h */
475 void exit_io_context(void);
477 #define NGROUPS_SMALL 32
478 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
482 gid_t small_block[NGROUPS_SMALL];
488 * get_group_info() must be called with the owning task locked (via task_lock())
489 * when task != current. The reason being that the vast majority of callers are
490 * looking at current->group_info, which can not be changed except by the
491 * current task. Changing current->group_info requires the task lock, too.
493 #define get_group_info(group_info) do { \
494 atomic_inc(&(group_info)->usage); \
497 #define put_group_info(group_info) do { \
498 if (atomic_dec_and_test(&(group_info)->usage)) \
499 groups_free(group_info); \
502 struct group_info *groups_alloc(int gidsetsize);
503 void groups_free(struct group_info *group_info);
504 int set_current_groups(struct group_info *group_info);
505 /* access the groups "array" with this macro */
506 #define GROUP_AT(gi, i) \
507 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
510 struct audit_context; /* See audit.c */
514 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
515 struct thread_info *thread_info;
517 unsigned long flags; /* per process flags, defined below */
518 unsigned long ptrace;
520 int lock_depth; /* Lock depth */
522 int prio, static_prio;
523 struct list_head run_list;
526 unsigned long sleep_avg;
527 long interactive_credit;
528 unsigned long long timestamp, last_ran;
531 unsigned long policy;
532 cpumask_t cpus_allowed;
533 unsigned int time_slice, first_time_slice;
535 #ifdef CONFIG_SCHEDSTATS
536 struct sched_info sched_info;
539 struct list_head tasks;
541 * ptrace_list/ptrace_children forms the list of my children
542 * that were stolen by a ptracer.
544 struct list_head ptrace_children;
545 struct list_head ptrace_list;
547 struct mm_struct *mm, *active_mm;
550 struct linux_binfmt *binfmt;
552 int exit_code, exit_signal;
553 int pdeath_signal; /* The signal sent when the parent dies */
555 unsigned long personality;
560 * pointers to (original) parent process, youngest child, younger sibling,
561 * older sibling, respectively. (p->father can be replaced with
564 struct task_struct *real_parent; /* real parent process (when being debugged) */
565 struct task_struct *parent; /* parent process */
567 * children/sibling forms the list of my children plus the
568 * tasks I'm ptracing.
570 struct list_head children; /* list of my children */
571 struct list_head sibling; /* linkage in my parent's children list */
572 struct task_struct *group_leader; /* threadgroup leader */
574 /* PID/PID hash table linkage. */
575 struct pid pids[PIDTYPE_MAX];
577 wait_queue_head_t wait_chldexit; /* for wait4() */
578 struct completion *vfork_done; /* for vfork() */
579 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
580 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
582 unsigned long rt_priority;
583 unsigned long it_real_value, it_prof_value, it_virt_value;
584 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
585 struct timer_list real_timer;
586 unsigned long utime, stime;
587 unsigned long nvcsw, nivcsw; /* context switch counts */
588 struct timespec start_time;
589 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
590 unsigned long min_flt, maj_flt;
591 /* process credentials */
592 uid_t uid,euid,suid,fsuid;
593 gid_t gid,egid,sgid,fsgid;
594 struct group_info *group_info;
595 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
596 unsigned keep_capabilities:1;
597 struct user_struct *user;
599 struct key *session_keyring; /* keyring inherited over fork */
600 struct key *process_keyring; /* keyring private to this process (CLONE_THREAD) */
601 struct key *thread_keyring; /* keyring private to this thread */
603 unsigned short used_math;
605 /* file system info */
606 int link_count, total_link_count;
608 struct sysv_sem sysvsem;
609 /* CPU-specific state of this task */
610 struct thread_struct thread;
611 /* filesystem information */
612 struct fs_struct *fs;
613 /* open file information */
614 struct files_struct *files;
616 struct namespace *namespace;
617 /* signal handlers */
618 struct signal_struct *signal;
619 struct sighand_struct *sighand;
621 sigset_t blocked, real_blocked;
622 struct sigpending pending;
624 unsigned long sas_ss_sp;
626 int (*notifier)(void *priv);
628 sigset_t *notifier_mask;
631 struct audit_context *audit_context;
633 /* Thread group tracking */
636 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
637 spinlock_t alloc_lock;
638 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
639 spinlock_t proc_lock;
640 /* context-switch lock */
641 spinlock_t switch_lock;
643 /* journalling filesystem info */
647 struct reclaim_state *reclaim_state;
649 struct dentry *proc_dentry;
650 struct backing_dev_info *backing_dev_info;
652 struct io_context *io_context;
654 unsigned long ptrace_message;
655 siginfo_t *last_siginfo; /* For ptrace use. */
657 * current io wait handle: wait queue entry to use for io waits
658 * If this thread is processing aio, this points at the waitqueue
659 * inside the currently handled kiocb. It may be NULL (i.e. default
660 * to a stack based synchronous wait) if its doing sync IO.
662 wait_queue_t *io_wait;
664 struct mempolicy *mempolicy;
665 short il_next; /* could be shared with used_math */
669 static inline pid_t process_group(struct task_struct *tsk)
671 return tsk->signal->pgrp;
675 * pid_alive - check that a task structure is not stale
676 * @p: Task structure to be checked.
678 * Test if a process is not yet dead (at most zombie state)
679 * If pid_alive fails, then pointers within the task structure
680 * can be stale and must not be dereferenced.
682 static inline int pid_alive(struct task_struct *p)
684 return p->pids[PIDTYPE_PID].nr != 0;
687 extern void free_task(struct task_struct *tsk);
688 extern void __put_task_struct(struct task_struct *tsk);
689 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
690 #define put_task_struct(tsk) \
691 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
696 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
697 /* Not implemented yet, only for 486*/
698 #define PF_STARTING 0x00000002 /* being created */
699 #define PF_EXITING 0x00000004 /* getting shut down */
700 #define PF_DEAD 0x00000008 /* Dead */
701 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
702 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
703 #define PF_DUMPCORE 0x00000200 /* dumped core */
704 #define PF_SIGNALED 0x00000400 /* killed by a signal */
705 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
706 #define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */
707 #define PF_FLUSHER 0x00002000 /* responsible for disk writeback */
709 #define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */
710 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
711 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
712 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
713 #define PF_KSWAPD 0x00040000 /* I am kswapd */
714 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
715 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
716 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
717 #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */
720 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
722 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
728 extern unsigned long long sched_clock(void);
730 /* sched_exec is called by processes performing an exec */
732 extern void sched_exec(void);
734 #define sched_exec() {}
737 extern void sched_idle_next(void);
738 extern void set_user_nice(task_t *p, long nice);
739 extern int task_prio(const task_t *p);
740 extern int task_nice(const task_t *p);
741 extern int task_curr(const task_t *p);
742 extern int idle_cpu(int cpu);
747 * The default (Linux) execution domain.
749 extern struct exec_domain default_exec_domain;
752 struct thread_info thread_info;
753 unsigned long stack[THREAD_SIZE/sizeof(long)];
756 #ifndef __HAVE_ARCH_KSTACK_END
757 static inline int kstack_end(void *addr)
759 /* Reliable end of stack detection:
760 * Some APM bios versions misalign the stack
762 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
766 extern union thread_union init_thread_union;
767 extern struct task_struct init_task;
769 extern struct mm_struct init_mm;
771 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
772 extern struct task_struct *find_task_by_pid_type(int type, int pid);
773 extern void set_special_pids(pid_t session, pid_t pgrp);
774 extern void __set_special_pids(pid_t session, pid_t pgrp);
776 /* per-UID process charging. */
777 extern struct user_struct * alloc_uid(uid_t);
778 static inline struct user_struct *get_uid(struct user_struct *u)
780 atomic_inc(&u->__count);
783 extern void free_uid(struct user_struct *);
784 extern void switch_uid(struct user_struct *);
786 #include <asm/current.h>
788 extern void do_timer(struct pt_regs *);
790 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
791 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
792 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
793 unsigned long clone_flags));
795 extern void kick_process(struct task_struct *tsk);
797 static inline void kick_process(struct task_struct *tsk) { }
799 extern void FASTCALL(sched_fork(task_t * p));
800 extern void FASTCALL(sched_exit(task_t * p));
802 extern int in_group_p(gid_t);
803 extern int in_egroup_p(gid_t);
805 extern void proc_caches_init(void);
806 extern void flush_signals(struct task_struct *);
807 extern void flush_signal_handlers(struct task_struct *, int force_default);
808 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
810 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
815 spin_lock_irqsave(&tsk->sighand->siglock, flags);
816 ret = dequeue_signal(tsk, mask, info);
817 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
822 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
824 extern void unblock_all_signals(void);
825 extern void release_task(struct task_struct * p);
826 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
827 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
828 extern int force_sigsegv(int, struct task_struct *);
829 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
830 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
831 extern int kill_pg_info(int, struct siginfo *, pid_t);
832 extern int kill_proc_info(int, struct siginfo *, pid_t);
833 extern void do_notify_parent(struct task_struct *, int);
834 extern void force_sig(int, struct task_struct *);
835 extern void force_sig_specific(int, struct task_struct *);
836 extern int send_sig(int, struct task_struct *, int);
837 extern void zap_other_threads(struct task_struct *p);
838 extern int kill_pg(pid_t, int, int);
839 extern int kill_sl(pid_t, int, int);
840 extern int kill_proc(pid_t, int, int);
841 extern struct sigqueue *sigqueue_alloc(void);
842 extern void sigqueue_free(struct sigqueue *);
843 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
844 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
845 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
846 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
848 /* These can be the second arg to send_sig_info/send_group_sig_info. */
849 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
850 #define SEND_SIG_PRIV ((struct siginfo *) 1)
851 #define SEND_SIG_FORCED ((struct siginfo *) 2)
853 /* True if we are on the alternate signal stack. */
855 static inline int on_sig_stack(unsigned long sp)
857 return (sp - current->sas_ss_sp < current->sas_ss_size);
860 static inline int sas_ss_flags(unsigned long sp)
862 return (current->sas_ss_size == 0 ? SS_DISABLE
863 : on_sig_stack(sp) ? SS_ONSTACK : 0);
867 #ifdef CONFIG_SECURITY
868 /* code is in security.c */
869 extern int capable(int cap);
871 static inline int capable(int cap)
873 if (cap_raised(current->cap_effective, cap)) {
874 current->flags |= PF_SUPERPRIV;
882 * Routines for handling mm_structs
884 extern struct mm_struct * mm_alloc(void);
886 /* mmdrop drops the mm and the page tables */
887 extern void FASTCALL(__mmdrop(struct mm_struct *));
888 static inline void mmdrop(struct mm_struct * mm)
890 if (atomic_dec_and_test(&mm->mm_count))
894 /* mmput gets rid of the mappings and all user-space */
895 extern void mmput(struct mm_struct *);
896 /* Grab a reference to a task's mm, if it is not already going away */
897 extern struct mm_struct *get_task_mm(struct task_struct *task);
898 /* Remove the current tasks stale references to the old mm_struct */
899 extern void mm_release(struct task_struct *, struct mm_struct *);
901 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
902 extern void flush_thread(void);
903 extern void exit_thread(void);
905 extern void exit_mm(struct task_struct *);
906 extern void exit_files(struct task_struct *);
907 extern void exit_signal(struct task_struct *);
908 extern void __exit_signal(struct task_struct *);
909 extern void exit_sighand(struct task_struct *);
910 extern void __exit_sighand(struct task_struct *);
911 extern void exit_itimers(struct signal_struct *);
913 extern NORET_TYPE void do_group_exit(int);
915 extern void reparent_to_init(void);
916 extern void daemonize(const char *, ...);
917 extern int allow_signal(int);
918 extern int disallow_signal(int);
919 extern task_t *child_reaper;
921 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
922 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
923 task_t *fork_idle(int);
925 extern void set_task_comm(struct task_struct *tsk, char *from);
926 extern void get_task_comm(char *to, struct task_struct *tsk);
929 extern void wait_task_inactive(task_t * p);
931 #define wait_task_inactive(p) do { } while (0)
934 #define remove_parent(p) list_del_init(&(p)->sibling)
935 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
937 #define REMOVE_LINKS(p) do { \
938 if (thread_group_leader(p)) \
939 list_del_init(&(p)->tasks); \
943 #define SET_LINKS(p) do { \
944 if (thread_group_leader(p)) \
945 list_add_tail(&(p)->tasks,&init_task.tasks); \
946 add_parent(p, (p)->parent); \
949 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
950 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
952 #define for_each_process(p) \
953 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
956 * Careful: do_each_thread/while_each_thread is a double loop so
957 * 'break' will not work as expected - use goto instead.
959 #define do_each_thread(g, t) \
960 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
962 #define while_each_thread(g, t) \
963 while ((t = next_thread(t)) != g)
965 extern task_t * FASTCALL(next_thread(const task_t *p));
967 #define thread_group_leader(p) (p->pid == p->tgid)
969 static inline int thread_group_empty(task_t *p)
971 return list_empty(&p->pids[PIDTYPE_TGID].pid_list);
974 #define delay_group_leader(p) \
975 (thread_group_leader(p) && !thread_group_empty(p))
977 extern void unhash_process(struct task_struct *p);
980 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring
981 * subscriptions and synchronises with wait4(). Also used in procfs.
983 * Nests both inside and outside of read_lock(&tasklist_lock).
984 * It must not be nested with write_lock_irq(&tasklist_lock),
985 * neither inside nor outside.
987 static inline void task_lock(struct task_struct *p)
989 spin_lock(&p->alloc_lock);
992 static inline void task_unlock(struct task_struct *p)
994 spin_unlock(&p->alloc_lock);
997 /* set thread flags in other task's structures
998 * - see asm/thread_info.h for TIF_xxxx flags available
1000 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1002 set_ti_thread_flag(tsk->thread_info,flag);
1005 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1007 clear_ti_thread_flag(tsk->thread_info,flag);
1010 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1012 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
1015 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1017 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
1020 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1022 return test_ti_thread_flag(tsk->thread_info,flag);
1025 static inline void set_tsk_need_resched(struct task_struct *tsk)
1027 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1030 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1032 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1035 static inline int signal_pending(struct task_struct *p)
1037 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1040 static inline int need_resched(void)
1042 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1045 extern void __cond_resched(void);
1046 static inline void cond_resched(void)
1053 * cond_resched_lock() - if a reschedule is pending, drop the given lock,
1054 * call schedule, and on return reacquire the lock.
1056 * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
1057 * operations here to prevent schedule() from being called twice (once via
1058 * spin_unlock(), once by hand).
1060 static inline void cond_resched_lock(spinlock_t * lock)
1062 if (need_resched()) {
1063 _raw_spin_unlock(lock);
1064 preempt_enable_no_resched();
1070 /* Reevaluate whether the task has signals pending delivery.
1071 This is required every time the blocked sigset_t changes.
1072 callers must hold sighand->siglock. */
1074 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
1075 extern void recalc_sigpending(void);
1077 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1080 * Wrappers for p->thread_info->cpu access. No-op on UP.
1084 static inline unsigned int task_cpu(const struct task_struct *p)
1086 return p->thread_info->cpu;
1089 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1091 p->thread_info->cpu = cpu;
1096 static inline unsigned int task_cpu(const struct task_struct *p)
1101 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1105 #endif /* CONFIG_SMP */
1107 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1108 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1110 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1112 mm->mmap_base = TASK_UNMAPPED_BASE;
1113 mm->get_unmapped_area = arch_get_unmapped_area;
1114 mm->unmap_area = arch_unmap_area;
1118 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1119 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1121 #ifdef CONFIG_MAGIC_SYSRQ
1123 extern void normalize_rt_tasks(void);
1127 #endif /* __KERNEL__ */