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>
34 extern int exec_shield;
35 extern int exec_shield_randomize;
36 extern int print_fatal_signals;
41 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
42 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
43 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
44 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
45 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
46 #define CLONE_IDLETASK 0x00001000 /* set if new pid should be 0 (kernel only)*/
47 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
48 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
49 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
50 #define CLONE_THREAD 0x00010000 /* Same thread group? */
51 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
52 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
53 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
54 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
55 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
56 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
57 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
58 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
59 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
62 * List of flags we want to share for kernel threads,
63 * if only because they are not used by them anyway.
65 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
68 * These are the constant used to fake the fixed-point load-average
69 * counting. Some notes:
70 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
71 * a load-average precision of 10 bits integer + 11 bits fractional
72 * - if you want to count load-averages more often, you need more
73 * precision, or rounding will get you. With 2-second counting freq,
74 * the EXP_n values would be 1981, 2034 and 2043 if still using only
77 extern unsigned long avenrun[]; /* Load averages */
79 #define FSHIFT 11 /* nr of bits of precision */
80 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
81 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
82 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
83 #define EXP_5 2014 /* 1/exp(5sec/5min) */
84 #define EXP_15 2037 /* 1/exp(5sec/15min) */
86 #define CALC_LOAD(load,exp,n) \
88 load += n*(FIXED_1-exp); \
91 #define CT_TO_SECS(x) ((x) / HZ)
92 #define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ)
94 extern int nr_threads;
96 DECLARE_PER_CPU(unsigned long, process_counts);
97 extern int nr_processes(void);
98 extern unsigned long nr_running(void);
99 extern unsigned long nr_uninterruptible(void);
100 extern unsigned long nr_iowait(void);
102 #include <linux/time.h>
103 #include <linux/param.h>
104 #include <linux/resource.h>
105 #include <linux/timer.h>
107 #include <asm/processor.h>
108 #include <linux/vserver/context.h>
110 #define TASK_RUNNING 0
111 #define TASK_INTERRUPTIBLE 1
112 #define TASK_UNINTERRUPTIBLE 2
113 #define TASK_STOPPED 4
114 #define TASK_ZOMBIE 8
116 #define TASK_ONHOLD 32
118 #define __set_task_state(tsk, state_value) \
119 do { (tsk)->state = (state_value); } while (0)
120 #define set_task_state(tsk, state_value) \
121 set_mb((tsk)->state, (state_value))
123 #define __set_current_state(state_value) \
124 do { current->state = (state_value); } while (0)
125 #define set_current_state(state_value) \
126 set_mb(current->state, (state_value))
129 * Scheduling policies
131 #define SCHED_NORMAL 0
141 #include <linux/taskdelays.h>
142 #include <linux/spinlock.h>
145 * This serializes "schedule()" and also protects
146 * the run-queue from deletions/modifications (but
147 * _adding_ to the beginning of the run-queue has
150 extern rwlock_t tasklist_lock;
151 extern spinlock_t mmlist_lock;
153 typedef struct task_struct task_t;
155 extern void sched_init(void);
156 extern void sched_init_smp(void);
157 extern void init_idle(task_t *idle, int cpu);
159 extern cpumask_t nohz_cpu_mask;
161 extern void show_state(void);
162 extern void show_regs(struct pt_regs *);
165 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
166 * task), SP is the stack pointer of the first frame that should be shown in the back
167 * trace (or NULL if the entire call-chain of the task should be shown).
169 extern void show_stack(struct task_struct *task, unsigned long *sp);
171 void io_schedule(void);
172 long io_schedule_timeout(long timeout);
174 extern void cpu_init (void);
175 extern void trap_init(void);
176 extern void update_process_times(int user);
177 extern void scheduler_tick(int user_tick, int system);
178 extern unsigned long cache_decay_ticks;
180 /* Attach to any functions which should be ignored in wchan output. */
181 #define __sched __attribute__((__section__(".sched.text")))
182 /* Is this address in the __sched functions? */
183 extern int in_sched_functions(unsigned long addr);
185 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
186 extern signed long FASTCALL(schedule_timeout(signed long timeout));
187 asmlinkage void schedule(void);
191 /* Maximum number of active map areas.. This is a random (large) number */
192 #define DEFAULT_MAX_MAP_COUNT 65536
194 extern int sysctl_max_map_count;
196 #include <linux/aio.h>
199 struct vm_area_struct * mmap; /* list of VMAs */
200 struct rb_root mm_rb;
201 struct vm_area_struct * mmap_cache; /* last find_vma result */
202 unsigned long free_area_cache; /* first hole */
203 unsigned long non_executable_cache; /* last hole top */
204 unsigned long mmap_top; /* top of mmap area */
206 atomic_t mm_users; /* How many users with user space? */
207 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
208 int map_count; /* number of VMAs */
209 struct rw_semaphore mmap_sem;
210 spinlock_t page_table_lock; /* Protects task page tables and mm->rss */
212 struct list_head mmlist; /* List of all active mm's. These are globally strung
213 * together off init_mm.mmlist, and are protected
217 unsigned long start_code, end_code, start_data, end_data;
218 unsigned long start_brk, brk, start_stack;
219 unsigned long arg_start, arg_end, env_start, env_end;
220 unsigned long rss, total_vm, locked_vm;
221 unsigned long def_flags;
223 unsigned long saved_auxv[40]; /* for /proc/PID/auxv */
226 #ifdef CONFIG_HUGETLB_PAGE
229 cpumask_t cpu_vm_mask;
231 /* Architecture-specific MM context */
232 mm_context_t context;
233 struct vx_info *mm_vx_info;
235 /* coredumping support */
237 struct completion *core_startup_done, core_done;
240 rwlock_t ioctx_list_lock;
241 struct kioctx *ioctx_list;
243 struct kioctx default_kioctx;
246 extern int mmlist_nr;
248 struct sighand_struct {
250 struct k_sigaction action[_NSIG];
255 * NOTE! "signal_struct" does not have it's own
256 * locking, because a shared signal_struct always
257 * implies a shared sighand_struct, so locking
258 * sighand_struct is always a proper superset of
259 * the locking of signal_struct.
261 struct signal_struct {
264 /* current thread group signal load-balancing target: */
267 /* shared signal handling: */
268 struct sigpending shared_pending;
270 /* thread group exit support */
274 * - notify group_exit_task when ->count is equal to notify_count
275 * - everyone except group_exit_task is stopped during signal delivery
276 * of fatal signals, group_exit_task processes the signal.
278 struct task_struct *group_exit_task;
281 /* thread group stop support, overloads group_exit_code too */
282 int group_stop_count;
284 /* POSIX.1b Interval Timers */
285 struct list_head posix_timers;
287 /* job control IDs */
291 /* boolean value for session group leader */
294 struct tty_struct *tty; /* NULL if no tty */
298 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
299 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
300 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
301 * are inverted: lower p->prio value means higher priority.
303 * The MAX_USER_RT_PRIO value allows the actual maximum
304 * RT priority to be separate from the value exported to
305 * user-space. This allows kernel threads to set their
306 * priority to a value higher than any user task. Note:
307 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
310 #define MAX_USER_RT_PRIO 100
311 #define MAX_RT_PRIO MAX_USER_RT_PRIO
313 #define MAX_PRIO (MAX_RT_PRIO + 40)
315 #define rt_task(p) ((p)->prio < MAX_RT_PRIO)
318 * Some day this will be a full-fledged user tracking system..
321 atomic_t __count; /* reference count */
322 atomic_t processes; /* How many processes does this user have? */
323 atomic_t files; /* How many open files does this user have? */
324 atomic_t sigpending; /* How many pending signals does this user have? */
325 /* protected by mq_lock */
326 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
328 /* Hash table maintenance information */
329 struct list_head uidhash_list;
334 extern struct user_struct *find_user(xid_t, uid_t);
336 extern struct user_struct root_user;
337 #define INIT_USER (&root_user)
339 typedef struct prio_array prio_array_t;
340 struct backing_dev_info;
341 struct reclaim_state;
343 /* POSIX.1b interval timer structure. */
345 struct list_head list; /* free/ allocate list */
347 clockid_t it_clock; /* which timer type */
348 timer_t it_id; /* timer id */
349 int it_overrun; /* overrun on pending signal */
350 int it_overrun_last; /* overrun on last delivered signal */
351 int it_requeue_pending; /* waiting to requeue this timer */
352 int it_sigev_notify; /* notify word of sigevent struct */
353 int it_sigev_signo; /* signo word of sigevent struct */
354 sigval_t it_sigev_value; /* value word of sigevent struct */
355 unsigned long it_incr; /* interval specified in jiffies */
356 struct task_struct *it_process; /* process to send signal to */
357 struct timer_list it_timer;
358 struct sigqueue *sigq; /* signal queue entry. */
362 struct io_context; /* See blkdev.h */
363 void exit_io_context(void);
365 #define NGROUPS_SMALL 32
366 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
370 gid_t small_block[NGROUPS_SMALL];
376 * get_group_info() must be called with the owning task locked (via task_lock())
377 * when task != current. The reason being that the vast majority of callers are
378 * looking at current->group_info, which can not be changed except by the
379 * current task. Changing current->group_info requires the task lock, too.
381 #define get_group_info(group_info) do { \
382 atomic_inc(&(group_info)->usage); \
385 #define put_group_info(group_info) do { \
386 if (atomic_dec_and_test(&(group_info)->usage)) \
387 groups_free(group_info); \
390 struct group_info *groups_alloc(int gidsetsize);
391 void groups_free(struct group_info *group_info);
392 int set_current_groups(struct group_info *group_info);
393 /* access the groups "array" with this macro */
394 #define GROUP_AT(gi, i) \
395 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
398 struct audit_context; /* See audit.c */
402 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
403 struct thread_info *thread_info;
405 unsigned long flags; /* per process flags, defined below */
406 unsigned long ptrace;
408 int lock_depth; /* Lock depth */
410 int prio, static_prio;
411 struct list_head run_list;
414 unsigned long sleep_avg;
415 long interactive_credit;
416 unsigned long long timestamp;
419 unsigned long policy;
420 cpumask_t cpus_allowed;
421 unsigned int time_slice, first_time_slice;
423 struct list_head tasks;
424 struct list_head ptrace_children;
425 struct list_head ptrace_list;
427 struct mm_struct *mm, *active_mm;
430 struct linux_binfmt *binfmt;
431 int exit_code, exit_signal;
432 int pdeath_signal; /* The signal sent when the parent dies */
434 unsigned long personality;
439 * pointers to (original) parent process, youngest child, younger sibling,
440 * older sibling, respectively. (p->father can be replaced with
443 struct task_struct *real_parent; /* real parent process (when being debugged) */
444 struct task_struct *parent; /* parent process */
445 struct list_head children; /* list of my children */
446 struct list_head sibling; /* linkage in my parent's children list */
447 struct task_struct *group_leader; /* threadgroup leader */
449 /* PID/PID hash table linkage. */
450 struct pid_link pids[PIDTYPE_MAX];
452 wait_queue_head_t wait_chldexit; /* for wait4() */
453 struct completion *vfork_done; /* for vfork() */
454 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
455 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
457 unsigned long rt_priority;
458 unsigned long it_real_value, it_prof_value, it_virt_value;
459 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
460 struct timer_list real_timer;
461 unsigned long utime, stime, cutime, cstime;
462 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; /* context switch counts */
464 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
465 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
466 /* process credentials */
467 uid_t uid,euid,suid,fsuid;
468 gid_t gid,egid,sgid,fsgid;
469 struct group_info *group_info;
470 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
471 int keep_capabilities:1;
472 struct user_struct *user;
474 struct rlimit rlim[RLIM_NLIMITS];
475 unsigned short used_math;
477 /* file system info */
478 int link_count, total_link_count;
480 struct sysv_sem sysvsem;
481 /* CPU-specific state of this task */
482 struct thread_struct thread;
483 /* filesystem information */
484 struct fs_struct *fs;
485 /* open file information */
486 struct files_struct *files;
488 struct namespace *namespace;
489 /* signal handlers */
490 struct signal_struct *signal;
491 struct sighand_struct *sighand;
493 sigset_t blocked, real_blocked;
494 struct sigpending pending;
496 unsigned long sas_ss_sp;
498 int (*notifier)(void *priv);
500 sigset_t *notifier_mask;
504 void (*tux_exit)(void);
508 struct audit_context *audit_context;
510 /* vserver context data */
512 struct vx_info *vx_info;
514 /* vserver network data */
516 struct nx_info *nx_info;
518 /* Thread group tracking */
521 /* Protection of (de-)allocation: mm, files, fs, tty */
522 spinlock_t alloc_lock;
523 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
524 spinlock_t proc_lock;
525 /* context-switch lock */
526 spinlock_t switch_lock;
528 /* journalling filesystem info */
532 struct reclaim_state *reclaim_state;
534 struct dentry *proc_dentry;
535 struct backing_dev_info *backing_dev_info;
537 struct io_context *io_context;
539 unsigned long ptrace_message;
540 siginfo_t *last_siginfo; /* For ptrace use. */
543 struct mempolicy *mempolicy;
544 short il_next; /* could be shared with used_math */
548 spinlock_t ckrm_tsklock;
550 #ifdef CONFIG_CKRM_TYPE_TASKCLASS
551 // .. Hubertus should change to CONFIG_CKRM_TYPE_TASKCLASS
552 struct ckrm_task_class *taskclass;
553 struct list_head taskclass_link;
554 #endif // CONFIG_CKRM_TYPE_TASKCLASS
555 #endif // CONFIG_CKRM
557 struct task_delay_info delays;
560 static inline pid_t process_group(struct task_struct *tsk)
562 return tsk->signal->pgrp;
565 extern void __put_task_struct(struct task_struct *tsk);
566 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
567 #define put_task_struct(tsk) \
568 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
573 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
574 /* Not implemented yet, only for 486*/
575 #define PF_STARTING 0x00000002 /* being created */
576 #define PF_EXITING 0x00000004 /* getting shut down */
577 #define PF_DEAD 0x00000008 /* Dead */
578 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
579 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
580 #define PF_DUMPCORE 0x00000200 /* dumped core */
581 #define PF_SIGNALED 0x00000400 /* killed by a signal */
582 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
583 #define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */
584 #define PF_FLUSHER 0x00002000 /* responsible for disk writeback */
586 #define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */
587 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
588 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
589 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
590 #define PF_KSWAPD 0x00040000 /* I am kswapd */
591 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
592 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
593 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
594 #define PF_RELOCEXEC 0x00400000 /* relocate shared libraries */
597 #define PF_MEMIO 0x00400000 /* I am potentially doing I/O for mem */
598 #define PF_IOWAIT 0x00800000 /* I am waiting on disk I/O */
601 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
603 #define SD_BALANCE_NEWIDLE 1 /* Balance when about to become idle */
604 #define SD_BALANCE_EXEC 2 /* Balance on exec */
605 #define SD_BALANCE_CLONE 4 /* Balance on clone */
606 #define SD_WAKE_IDLE 8 /* Wake to idle CPU on task wakeup */
607 #define SD_WAKE_AFFINE 16 /* Wake task to waking CPU */
608 #define SD_WAKE_BALANCE 32 /* Perform balancing at task wakeup */
609 #define SD_SHARE_CPUPOWER 64 /* Domain members share cpu power */
612 struct sched_group *next; /* Must be a circular list */
616 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
617 * single CPU. This should be read only (except for setup). Although
618 * it will need to be written to at cpu hot(un)plug time, perhaps the
619 * cpucontrol semaphore will provide enough exclusion?
621 unsigned long cpu_power;
624 struct sched_domain {
625 /* These fields must be setup */
626 struct sched_domain *parent; /* top domain must be null terminated */
627 struct sched_group *groups; /* the balancing groups of the domain */
628 cpumask_t span; /* span of all CPUs in this domain */
629 unsigned long min_interval; /* Minimum balance interval ms */
630 unsigned long max_interval; /* Maximum balance interval ms */
631 unsigned int busy_factor; /* less balancing by factor if busy */
632 unsigned int imbalance_pct; /* No balance until over watermark */
633 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
634 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
635 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
636 int flags; /* See SD_* */
638 /* Runtime fields. */
639 unsigned long last_balance; /* init to jiffies. units in jiffies */
640 unsigned int balance_interval; /* initialise to 1. units in ms. */
641 unsigned int nr_balance_failed; /* initialise to 0 */
644 /* Common values for SMT siblings */
645 #define SD_SIBLING_INIT (struct sched_domain) { \
646 .span = CPU_MASK_NONE, \
652 .imbalance_pct = 110, \
653 .cache_hot_time = 0, \
654 .cache_nice_tries = 0, \
655 .per_cpu_gain = 15, \
656 .flags = SD_BALANCE_NEWIDLE \
661 | SD_SHARE_CPUPOWER, \
662 .last_balance = jiffies, \
663 .balance_interval = 1, \
664 .nr_balance_failed = 0, \
667 /* Common values for CPUs */
668 #define SD_CPU_INIT (struct sched_domain) { \
669 .span = CPU_MASK_NONE, \
675 .imbalance_pct = 125, \
676 .cache_hot_time = (5*1000000/2), \
677 .cache_nice_tries = 1, \
678 .per_cpu_gain = 100, \
679 .flags = SD_BALANCE_NEWIDLE \
684 .last_balance = jiffies, \
685 .balance_interval = 1, \
686 .nr_balance_failed = 0, \
690 /* Common values for NUMA nodes */
691 #define SD_NODE_INIT (struct sched_domain) { \
692 .span = CPU_MASK_NONE, \
696 .max_interval = 32, \
698 .imbalance_pct = 125, \
699 .cache_hot_time = (10*1000000), \
700 .cache_nice_tries = 1, \
701 .per_cpu_gain = 100, \
702 .flags = SD_BALANCE_EXEC \
705 .last_balance = jiffies, \
706 .balance_interval = 1, \
707 .nr_balance_failed = 0, \
711 extern void cpu_attach_domain(struct sched_domain *sd, int cpu);
713 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
715 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
721 extern unsigned long long sched_clock(void);
724 extern void sched_balance_exec(void);
726 #define sched_balance_exec() {}
729 extern void sched_idle_next(void);
730 extern void set_user_nice(task_t *p, long nice);
731 extern int task_prio(const task_t *p);
732 extern int task_nice(const task_t *p);
733 extern int task_curr(const task_t *p);
734 extern int idle_cpu(int cpu);
739 * The default (Linux) execution domain.
741 extern struct exec_domain default_exec_domain;
744 struct thread_info thread_info;
745 unsigned long stack[THREAD_SIZE/sizeof(long)];
748 #ifndef __HAVE_ARCH_KSTACK_END
749 static inline int kstack_end(void *addr)
751 /* Reliable end of stack detection:
752 * Some APM bios versions misalign the stack
754 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
758 extern union thread_union init_thread_union;
759 extern struct task_struct init_task;
761 extern struct mm_struct init_mm;
763 extern struct task_struct *find_task_by_pid(int pid);
764 extern void set_special_pids(pid_t session, pid_t pgrp);
765 extern void __set_special_pids(pid_t session, pid_t pgrp);
767 /* per-UID process charging. */
768 extern struct user_struct * alloc_uid(xid_t, uid_t);
769 static inline struct user_struct *get_uid(struct user_struct *u)
771 atomic_inc(&u->__count);
774 extern void free_uid(struct user_struct *);
775 extern void switch_uid(struct user_struct *);
777 #include <asm/current.h>
779 extern unsigned long itimer_ticks;
780 extern unsigned long itimer_next;
781 extern void do_timer(struct pt_regs *);
783 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
784 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
785 extern void FASTCALL(wake_up_forked_process(struct task_struct * tsk));
787 extern void kick_process(struct task_struct *tsk);
788 extern void FASTCALL(wake_up_forked_thread(struct task_struct * tsk));
790 static inline void kick_process(struct task_struct *tsk) { }
791 static inline void wake_up_forked_thread(struct task_struct * tsk)
793 wake_up_forked_process(tsk);
796 extern void FASTCALL(sched_fork(task_t * p));
797 extern void FASTCALL(sched_exit(task_t * p));
799 extern int in_group_p(gid_t);
800 extern int in_egroup_p(gid_t);
802 extern void proc_caches_init(void);
803 extern void flush_signals(struct task_struct *);
804 extern void flush_signal_handlers(struct task_struct *, int force_default);
805 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
807 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
812 spin_lock_irqsave(&tsk->sighand->siglock, flags);
813 ret = dequeue_signal(tsk, mask, info);
814 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
819 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
821 extern void unblock_all_signals(void);
822 extern void release_task(struct task_struct * p);
823 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
824 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
825 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
826 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
827 extern int kill_pg_info(int, struct siginfo *, pid_t);
828 extern int kill_sl_info(int, struct siginfo *, pid_t);
829 extern int kill_proc_info(int, struct siginfo *, pid_t);
830 extern void notify_parent(struct task_struct *, int);
831 extern void do_notify_parent(struct task_struct *, int);
832 extern void force_sig(int, struct task_struct *);
833 extern void force_sig_specific(int, struct task_struct *);
834 extern int send_sig(int, struct task_struct *, int);
835 extern void zap_other_threads(struct task_struct *p);
836 extern int kill_pg(pid_t, int, int);
837 extern int kill_sl(pid_t, int, int);
838 extern int kill_proc(pid_t, int, int);
839 extern struct sigqueue *sigqueue_alloc(void);
840 extern void sigqueue_free(struct sigqueue *);
841 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
842 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
843 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
844 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
846 /* These can be the second arg to send_sig_info/send_group_sig_info. */
847 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
848 #define SEND_SIG_PRIV ((struct siginfo *) 1)
849 #define SEND_SIG_FORCED ((struct siginfo *) 2)
851 /* True if we are on the alternate signal stack. */
853 static inline int on_sig_stack(unsigned long sp)
855 return (sp - current->sas_ss_sp < current->sas_ss_size);
858 static inline int sas_ss_flags(unsigned long sp)
860 return (current->sas_ss_size == 0 ? SS_DISABLE
861 : on_sig_stack(sp) ? SS_ONSTACK : 0);
865 #ifdef CONFIG_SECURITY
866 /* code is in security.c */
867 extern int capable(int cap);
869 static inline int capable(int cap)
871 if (cap_raised(current->cap_effective, cap)) {
872 current->flags |= PF_SUPERPRIV;
880 * Routines for handling mm_structs
882 extern struct mm_struct * mm_alloc(void);
884 /* mmdrop drops the mm and the page tables */
885 extern void FASTCALL(__mmdrop(struct mm_struct *));
886 static inline void mmdrop(struct mm_struct * mm)
888 if (atomic_dec_and_test(&mm->mm_count))
892 /* mmput gets rid of the mappings and all user-space */
893 extern void mmput(struct mm_struct *);
894 /* Grab a reference to the mm if its not already going away */
895 extern struct mm_struct *mmgrab(struct mm_struct *);
896 /* Remove the current tasks stale references to the old mm_struct */
897 extern void mm_release(struct task_struct *, struct mm_struct *);
899 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
900 extern void flush_thread(void);
901 extern void exit_thread(void);
903 extern void exit_mm(struct task_struct *);
904 extern void exit_files(struct task_struct *);
905 extern void exit_signal(struct task_struct *);
906 extern void __exit_signal(struct task_struct *);
907 extern void exit_sighand(struct task_struct *);
908 extern void __exit_sighand(struct task_struct *);
909 extern void exit_itimers(struct signal_struct *);
911 extern NORET_TYPE void do_group_exit(int);
913 extern void reparent_to_init(void);
914 extern void daemonize(const char *, ...);
915 extern int allow_signal(int);
916 extern int disallow_signal(int);
917 extern task_t *child_reaper;
919 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
920 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
921 extern struct task_struct * copy_process(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
924 extern void wait_task_inactive(task_t * p);
926 #define wait_task_inactive(p) do { } while (0)
929 #define remove_parent(p) list_del_init(&(p)->sibling)
930 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
932 #define REMOVE_LINKS(p) do { \
933 if (thread_group_leader(p)) \
934 list_del_init(&(p)->tasks); \
938 #define SET_LINKS(p) do { \
939 if (thread_group_leader(p)) \
940 list_add_tail(&(p)->tasks,&init_task.tasks); \
941 add_parent(p, (p)->parent); \
944 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
945 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
947 #define for_each_process(p) \
948 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
951 * Careful: do_each_thread/while_each_thread is a double loop so
952 * 'break' will not work as expected - use goto instead.
954 #define do_each_thread(g, t) \
955 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
957 #define while_each_thread(g, t) \
958 while ((t = next_thread(t)) != g)
960 extern task_t * FASTCALL(next_thread(const task_t *p));
962 #define thread_group_leader(p) (p->pid == p->tgid)
964 static inline int thread_group_empty(task_t *p)
966 struct pid *pid = p->pids[PIDTYPE_TGID].pidptr;
968 return pid->task_list.next->next == &pid->task_list;
971 #define delay_group_leader(p) \
972 (thread_group_leader(p) && !thread_group_empty(p))
974 extern void unhash_process(struct task_struct *p);
977 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info and synchronises with
980 * Nests both inside and outside of read_lock(&tasklist_lock).
981 * It must not be nested with write_lock_irq(&tasklist_lock),
982 * neither inside nor outside.
984 static inline void task_lock(struct task_struct *p)
986 spin_lock(&p->alloc_lock);
989 static inline void task_unlock(struct task_struct *p)
991 spin_unlock(&p->alloc_lock);
995 * get_task_mm - acquire a reference to the task's mm
997 * Returns %NULL if the task has no mm. User must release
998 * the mm via mmput() after use.
1000 static inline struct mm_struct * get_task_mm(struct task_struct * task)
1002 struct mm_struct * mm;
1014 /* set thread flags in other task's structures
1015 * - see asm/thread_info.h for TIF_xxxx flags available
1017 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1019 set_ti_thread_flag(tsk->thread_info,flag);
1022 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1024 clear_ti_thread_flag(tsk->thread_info,flag);
1027 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1029 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
1032 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1034 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
1037 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1039 return test_ti_thread_flag(tsk->thread_info,flag);
1042 static inline void set_tsk_need_resched(struct task_struct *tsk)
1044 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1047 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1049 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1052 static inline int signal_pending(struct task_struct *p)
1054 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1057 static inline int need_resched(void)
1059 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1062 extern void __cond_resched(void);
1063 static inline void cond_resched(void)
1070 * cond_resched_lock() - if a reschedule is pending, drop the given lock,
1071 * call schedule, and on return reacquire the lock.
1073 * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
1074 * operations here to prevent schedule() from being called twice (once via
1075 * spin_unlock(), once by hand).
1077 static inline void cond_resched_lock(spinlock_t * lock)
1079 if (need_resched()) {
1080 _raw_spin_unlock(lock);
1081 preempt_enable_no_resched();
1087 /* Reevaluate whether the task has signals pending delivery.
1088 This is required every time the blocked sigset_t changes.
1089 callers must hold sighand->siglock. */
1091 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
1092 extern void recalc_sigpending(void);
1094 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1097 * Wrappers for p->thread_info->cpu access. No-op on UP.
1101 static inline unsigned int task_cpu(const struct task_struct *p)
1103 return p->thread_info->cpu;
1106 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1108 p->thread_info->cpu = cpu;
1113 static inline unsigned int task_cpu(const struct task_struct *p)
1118 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1122 #endif /* CONFIG_SMP */
1125 /* API for registering delay info */
1126 #ifdef CONFIG_DELAY_ACCT
1128 #define test_delay_flag(tsk,flg) ((tsk)->flags & (flg))
1129 #define set_delay_flag(tsk,flg) ((tsk)->flags |= (flg))
1130 #define clear_delay_flag(tsk,flg) ((tsk)->flags &= ~(flg))
1132 #define def_delay_var(var) unsigned long long var
1133 #define get_delay(tsk,field) ((tsk)->delays.field)
1134 #define delay_value(x) (((unsigned long)(x))/1000)
1136 #define start_delay(var) ((var) = sched_clock())
1137 #define start_delay_set(var,flg) (set_delay_flag(current,flg),(var) = sched_clock())
1139 #define inc_delay(tsk,field) (((tsk)->delays.field)++)
1140 #define add_delay_ts(tsk,field,start_ts,end_ts) ((tsk)->delays.field += delay_value((end_ts)-(start_ts)))
1141 #define add_delay_clear(tsk,field,start_ts,flg) (add_delay_ts(tsk,field,start_ts,sched_clock()),clear_delay_flag(tsk,flg))
1143 static inline void add_io_delay(unsigned long dstart)
1145 struct task_struct * tsk = current;
1146 unsigned long val = delay_value(sched_clock()-dstart);
1147 if (test_delay_flag(tsk,PF_MEMIO)) {
1148 tsk->delays.mem_iowait_total += val;
1149 tsk->delays.num_memwaits++;
1151 tsk->delays.iowait_total += val;
1152 tsk->delays.num_iowaits++;
1154 clear_delay_flag(tsk,PF_IOWAIT);
1160 #define test_delay_flag(tsk,flg) (0)
1161 #define set_delay_flag(tsk,flg) do { } while (0)
1162 #define clear_delay_flag(tsk,flg) do { } while (0)
1164 #define def_delay_var(var)
1165 #define get_delay(tsk,field) (0)
1167 #define start_delay(var) do { } while (0)
1168 #define start_delay_set(var,flg) do { } while (0)
1170 #define inc_delay(tsk,field) do { } while (0)
1171 #define add_delay_ts(tsk,field,start_ts,now) do { } while (0)
1172 #define add_delay_clear(tsk,field,start_ts,flg) do { } while (0)
1173 #define add_io_delay(dstart) do { } while (0)
1178 #endif /* __KERNEL__ */