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_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
47 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
48 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
49 #define CLONE_THREAD 0x00010000 /* Same thread group? */
50 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
51 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
52 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
53 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
54 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
55 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
56 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
57 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
58 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
61 * List of flags we want to share for kernel threads,
62 * if only because they are not used by them anyway.
64 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
67 * These are the constant used to fake the fixed-point load-average
68 * counting. Some notes:
69 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
70 * a load-average precision of 10 bits integer + 11 bits fractional
71 * - if you want to count load-averages more often, you need more
72 * precision, or rounding will get you. With 2-second counting freq,
73 * the EXP_n values would be 1981, 2034 and 2043 if still using only
76 extern unsigned long avenrun[]; /* Load averages */
78 #define FSHIFT 11 /* nr of bits of precision */
79 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
80 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
81 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
82 #define EXP_5 2014 /* 1/exp(5sec/5min) */
83 #define EXP_15 2037 /* 1/exp(5sec/15min) */
85 #define CALC_LOAD(load,exp,n) \
87 load += n*(FIXED_1-exp); \
90 #define CT_TO_SECS(x) ((x) / HZ)
91 #define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ)
93 extern int nr_threads;
95 DECLARE_PER_CPU(unsigned long, process_counts);
96 // DECLARE_PER_CPU(struct runqueue, runqueues); -- removed after ckrm cpu v7 merge
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>
109 #define TASK_RUNNING 0
110 #define TASK_INTERRUPTIBLE 1
111 #define TASK_UNINTERRUPTIBLE 2
112 #define TASK_STOPPED 4
113 #define TASK_TRACED 8
114 #define EXIT_ZOMBIE 16
116 #define TASK_ONHOLD 64
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 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
200 unsigned long, unsigned long);
203 arch_get_unmapped_exec_area(struct file *, unsigned long, unsigned long,
204 unsigned long, unsigned long);
206 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
207 unsigned long len, unsigned long pgoff,
208 unsigned long flags);
209 extern void arch_unmap_area(struct vm_area_struct *area);
210 extern void arch_unmap_area_topdown(struct vm_area_struct *area);
214 struct vm_area_struct * mmap; /* list of VMAs */
215 struct rb_root mm_rb;
216 struct vm_area_struct * mmap_cache; /* last find_vma result */
217 unsigned long (*get_unmapped_area) (struct file *filp,
218 unsigned long addr, unsigned long len,
219 unsigned long pgoff, unsigned long flags);
220 unsigned long (*get_unmapped_exec_area) (struct file *filp,
221 unsigned long addr, unsigned long len,
222 unsigned long pgoff, unsigned long flags);
223 void (*unmap_area) (struct vm_area_struct *area);
224 unsigned long mmap_base; /* base of mmap area */
225 unsigned long free_area_cache; /* first hole */
227 atomic_t mm_users; /* How many users with user space? */
228 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
229 int map_count; /* number of VMAs */
230 struct rw_semaphore mmap_sem;
231 spinlock_t page_table_lock; /* Protects task page tables and mm->rss */
233 struct list_head mmlist; /* List of all active mm's. These are globally strung
234 * together off init_mm.mmlist, and are protected
238 unsigned long start_code, end_code, start_data, end_data;
239 unsigned long start_brk, brk, start_stack;
240 unsigned long arg_start, arg_end, env_start, env_end;
241 unsigned long rss, anon_rss, total_vm, locked_vm, shared_vm;
242 unsigned long exec_vm, stack_vm, reserved_vm, def_flags;
244 unsigned long saved_auxv[42]; /* for /proc/PID/auxv */
247 cpumask_t cpu_vm_mask;
249 /* Architecture-specific MM context */
250 mm_context_t context;
251 struct vx_info *mm_vx_info;
253 /* Token based thrashing protection. */
254 unsigned long swap_token_time;
257 /* coredumping support */
259 struct completion *core_startup_done, core_done;
262 rwlock_t ioctx_list_lock;
263 struct kioctx *ioctx_list;
265 struct kioctx default_kioctx;
266 #ifdef CONFIG_CKRM_RES_MEM
267 struct ckrm_mem_res *memclass;
268 struct list_head tasklist; /* list of all tasks sharing this address space */
269 spinlock_t peertask_lock; /* protect above tasklist */
273 extern int mmlist_nr;
275 struct sighand_struct {
277 struct k_sigaction action[_NSIG];
282 * NOTE! "signal_struct" does not have it's own
283 * locking, because a shared signal_struct always
284 * implies a shared sighand_struct, so locking
285 * sighand_struct is always a proper superset of
286 * the locking of signal_struct.
288 struct signal_struct {
291 /* current thread group signal load-balancing target: */
294 /* shared signal handling: */
295 struct sigpending shared_pending;
297 /* thread group exit support */
301 * - notify group_exit_task when ->count is equal to notify_count
302 * - everyone except group_exit_task is stopped during signal delivery
303 * of fatal signals, group_exit_task processes the signal.
305 struct task_struct *group_exit_task;
308 /* thread group stop support, overloads group_exit_code too */
309 int group_stop_count;
310 /* 1 if group stopped since last SIGCONT, -1 if SIGCONT since report */
313 /* POSIX.1b Interval Timers */
314 struct list_head posix_timers;
316 /* job control IDs */
320 /* boolean value for session group leader */
323 struct tty_struct *tty; /* NULL if no tty */
326 * Cumulative resource counters for dead threads in the group,
327 * and for reaped dead child processes forked by this group.
328 * Live threads maintain their own counters and add to these
329 * in __exit_signal, except for the group leader.
331 unsigned long utime, stime, cutime, cstime;
332 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
333 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
337 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
338 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
339 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
340 * are inverted: lower p->prio value means higher priority.
342 * The MAX_USER_RT_PRIO value allows the actual maximum
343 * RT priority to be separate from the value exported to
344 * user-space. This allows kernel threads to set their
345 * priority to a value higher than any user task. Note:
346 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
349 #define MAX_USER_RT_PRIO 100
350 #define MAX_RT_PRIO MAX_USER_RT_PRIO
352 #define MAX_PRIO (MAX_RT_PRIO + 40)
354 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
357 * Some day this will be a full-fledged user tracking system..
360 atomic_t __count; /* reference count */
361 atomic_t processes; /* How many processes does this user have? */
362 atomic_t files; /* How many open files does this user have? */
363 atomic_t sigpending; /* How many pending signals does this user have? */
364 /* protected by mq_lock */
365 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
366 unsigned long locked_shm; /* How many pages of mlocked shm ? */
368 /* Hash table maintenance information */
369 struct list_head uidhash_list;
374 extern struct user_struct *find_user(xid_t, uid_t);
376 extern struct user_struct root_user;
377 #define INIT_USER (&root_user)
379 typedef struct prio_array prio_array_t;
380 struct backing_dev_info;
381 struct reclaim_state;
383 /* POSIX.1b interval timer structure. */
385 struct list_head list; /* free/ allocate list */
387 clockid_t it_clock; /* which timer type */
388 timer_t it_id; /* timer id */
389 int it_overrun; /* overrun on pending signal */
390 int it_overrun_last; /* overrun on last delivered signal */
391 int it_requeue_pending; /* waiting to requeue this timer */
392 int it_sigev_notify; /* notify word of sigevent struct */
393 int it_sigev_signo; /* signo word of sigevent struct */
394 sigval_t it_sigev_value; /* value word of sigevent struct */
395 unsigned long it_incr; /* interval specified in jiffies */
396 struct task_struct *it_process; /* process to send signal to */
397 struct timer_list it_timer;
398 struct sigqueue *sigq; /* signal queue entry. */
399 struct list_head abs_timer_entry; /* clock abs_timer_list */
400 struct timespec wall_to_prev; /* wall_to_monotonic used when set */
403 #ifdef CONFIG_SCHEDSTATS
405 /* cumulative counters */
406 unsigned long cpu_time, /* time spent on the cpu */
407 run_delay, /* time spent waiting on a runqueue */
408 pcnt; /* # of timeslices run on this cpu */
411 unsigned long last_arrival, /* when we last ran on a cpu */
412 last_queued; /* when we were last queued to run */
415 extern struct file_operations proc_schedstat_operations;
418 struct io_context; /* See blkdev.h */
419 void exit_io_context(void);
421 #define NGROUPS_SMALL 32
422 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
426 gid_t small_block[NGROUPS_SMALL];
432 * get_group_info() must be called with the owning task locked (via task_lock())
433 * when task != current. The reason being that the vast majority of callers are
434 * looking at current->group_info, which can not be changed except by the
435 * current task. Changing current->group_info requires the task lock, too.
437 #define get_group_info(group_info) do { \
438 atomic_inc(&(group_info)->usage); \
441 #define put_group_info(group_info) do { \
442 if (atomic_dec_and_test(&(group_info)->usage)) \
443 groups_free(group_info); \
446 struct group_info *groups_alloc(int gidsetsize);
447 void groups_free(struct group_info *group_info);
448 int set_current_groups(struct group_info *group_info);
449 /* access the groups "array" with this macro */
450 #define GROUP_AT(gi, i) \
451 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
454 struct audit_context; /* See audit.c */
457 #ifdef CONFIG_CKRM_CPU_SCHEDULE
459 * ckrm_cpu_demand_stat - used to track the cpu demand of a task/class
460 * @run: how much time it has been running since the counter started
461 * @total: total time since the counter started
462 * @last_sleep: the last time it sleeps, last_sleep = 0 when not sleeping
463 * @recalc_interval: how often do we recalculate the cpu_demand
464 * @cpu_demand: moving average of run/total
466 struct ckrm_cpu_demand_stat {
467 unsigned long long run;
468 unsigned long long total;
469 unsigned long long last_sleep;
470 unsigned long long recalc_interval;
471 unsigned long cpu_demand; /*estimated cpu demand */
477 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
478 struct thread_info *thread_info;
480 unsigned long flags; /* per process flags, defined below */
481 unsigned long ptrace;
483 int lock_depth; /* Lock depth */
485 int prio, static_prio;
486 struct list_head run_list;
489 unsigned long sleep_avg;
490 long interactive_credit;
491 unsigned long long timestamp, last_ran;
494 unsigned long policy;
495 cpumask_t cpus_allowed;
496 unsigned int time_slice, first_time_slice;
498 #ifdef CONFIG_SCHEDSTATS
499 struct sched_info sched_info;
502 struct list_head tasks;
504 * ptrace_list/ptrace_children forms the list of my children
505 * that were stolen by a ptracer.
507 struct list_head ptrace_children;
508 struct list_head ptrace_list;
510 struct mm_struct *mm, *active_mm;
513 struct linux_binfmt *binfmt;
515 int exit_code, exit_signal;
516 int pdeath_signal; /* The signal sent when the parent dies */
518 unsigned long personality;
523 * pointers to (original) parent process, youngest child, younger sibling,
524 * older sibling, respectively. (p->father can be replaced with
527 struct task_struct *real_parent; /* real parent process (when being debugged) */
528 struct task_struct *parent; /* parent process */
530 * children/sibling forms the list of my children plus the
531 * tasks I'm ptracing.
533 struct list_head children; /* list of my children */
534 struct list_head sibling; /* linkage in my parent's children list */
535 struct task_struct *group_leader; /* threadgroup leader */
537 /* PID/PID hash table linkage. */
538 struct pid pids[PIDTYPE_MAX];
540 wait_queue_head_t wait_chldexit; /* for wait4() */
541 struct completion *vfork_done; /* for vfork() */
542 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
543 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
545 unsigned long rt_priority;
546 unsigned long it_real_value, it_prof_value, it_virt_value;
547 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
548 struct timer_list real_timer;
549 unsigned long utime, stime;
550 unsigned long nvcsw, nivcsw; /* context switch counts */
551 struct timespec start_time;
552 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
553 unsigned long min_flt, maj_flt;
554 /* process credentials */
555 uid_t uid,euid,suid,fsuid;
556 gid_t gid,egid,sgid,fsgid;
557 struct group_info *group_info;
558 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
559 unsigned keep_capabilities:1;
560 struct user_struct *user;
562 struct rlimit rlim[RLIM_NLIMITS];
563 unsigned short used_math;
565 /* file system info */
566 int link_count, total_link_count;
568 struct sysv_sem sysvsem;
569 /* CPU-specific state of this task */
570 struct thread_struct thread;
571 /* filesystem information */
572 struct fs_struct *fs;
573 /* open file information */
574 struct files_struct *files;
576 struct namespace *namespace;
577 /* signal handlers */
578 struct signal_struct *signal;
579 struct sighand_struct *sighand;
580 sigset_t blocked, real_blocked;
581 struct sigpending pending;
583 unsigned long sas_ss_sp;
585 int (*notifier)(void *priv);
587 sigset_t *notifier_mask;
591 void (*tux_exit)(void);
595 struct audit_context *audit_context;
597 /* vserver context data */
599 struct vx_info *vx_info;
601 /* vserver network data */
603 struct nx_info *nx_info;
605 /* Thread group tracking */
608 /* Protection of (de-)allocation: mm, files, fs, tty */
609 spinlock_t alloc_lock;
610 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
611 spinlock_t proc_lock;
612 /* context-switch lock */
613 spinlock_t switch_lock;
615 /* journalling filesystem info */
619 struct reclaim_state *reclaim_state;
621 struct dentry *proc_dentry;
622 struct backing_dev_info *backing_dev_info;
624 struct io_context *io_context;
628 unsigned long ptrace_message;
629 siginfo_t *last_siginfo; /* For ptrace use. */
631 * current io wait handle: wait queue entry to use for io waits
632 * If this thread is processing aio, this points at the waitqueue
633 * inside the currently handled kiocb. It may be NULL (i.e. default
634 * to a stack based synchronous wait) if its doing sync IO.
636 wait_queue_t *io_wait;
638 struct mempolicy *mempolicy;
639 short il_next; /* could be shared with used_math */
643 spinlock_t ckrm_tsklock;
645 #ifdef CONFIG_CKRM_TYPE_TASKCLASS
646 // .. Hubertus should change to CONFIG_CKRM_TYPE_TASKCLASS
647 struct ckrm_task_class *taskclass;
648 struct list_head taskclass_link;
649 #ifdef CONFIG_CKRM_CPU_SCHEDULE
650 struct ckrm_cpu_class *cpu_class;
651 //track cpu demand of this task
652 struct ckrm_cpu_demand_stat demand_stat;
653 #endif //CONFIG_CKRM_CPU_SCHEDULE
654 #endif // CONFIG_CKRM_TYPE_TASKCLASS
655 #ifdef CONFIG_CKRM_RES_MEM
656 struct list_head mm_peers; // list of tasks using same mm_struct
657 #endif // CONFIG_CKRM_RES_MEM
658 #endif // CONFIG_CKRM
659 struct task_delay_info delays;
662 static inline pid_t process_group(struct task_struct *tsk)
664 return tsk->signal->pgrp;
667 extern void free_task(struct task_struct *tsk);
668 extern void __put_task_struct(struct task_struct *tsk);
669 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
670 #define put_task_struct(tsk) \
671 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
676 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
677 /* Not implemented yet, only for 486*/
678 #define PF_STARTING 0x00000002 /* being created */
679 #define PF_EXITING 0x00000004 /* getting shut down */
680 #define PF_DEAD 0x00000008 /* Dead */
681 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
682 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
683 #define PF_DUMPCORE 0x00000200 /* dumped core */
684 #define PF_SIGNALED 0x00000400 /* killed by a signal */
685 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
686 #define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */
687 #define PF_FLUSHER 0x00002000 /* responsible for disk writeback */
689 #define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */
690 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
691 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
692 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
693 #define PF_KSWAPD 0x00040000 /* I am kswapd */
694 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
695 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
696 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
697 #define PF_RELOCEXEC 0x00400000 /* relocate shared libraries */
699 #define PF_MEMIO 0x00400000 /* I am potentially doing I/O for mem */
700 #define PF_IOWAIT 0x00800000 /* I am waiting on disk I/O */
703 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
705 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
711 extern unsigned long long sched_clock(void);
713 /* sched_exec is called by processes performing an exec */
715 extern void sched_exec(void);
717 #define sched_exec() {}
720 extern void sched_idle_next(void);
721 extern void set_user_nice(task_t *p, long nice);
722 extern int task_prio(const task_t *p);
723 extern int task_nice(const task_t *p);
724 extern int task_curr(const task_t *p);
725 extern int idle_cpu(int cpu);
730 * The default (Linux) execution domain.
732 extern struct exec_domain default_exec_domain;
735 struct thread_info thread_info;
736 unsigned long stack[THREAD_SIZE/sizeof(long)];
739 #ifndef __HAVE_ARCH_KSTACK_END
740 static inline int kstack_end(void *addr)
742 /* Reliable end of stack detection:
743 * Some APM bios versions misalign the stack
745 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
749 extern union thread_union init_thread_union;
750 extern struct task_struct init_task;
752 extern struct mm_struct init_mm;
755 #define find_task_by_real_pid(nr) \
756 find_task_by_pid_type(PIDTYPE_PID, nr)
757 #define find_task_by_pid(nr) \
758 find_task_by_pid_type(PIDTYPE_PID, \
761 extern struct task_struct *find_task_by_pid_type(int type, int pid);
762 extern void set_special_pids(pid_t session, pid_t pgrp);
763 extern void __set_special_pids(pid_t session, pid_t pgrp);
765 /* per-UID process charging. */
766 extern struct user_struct * alloc_uid(xid_t, uid_t);
767 static inline struct user_struct *get_uid(struct user_struct *u)
769 atomic_inc(&u->__count);
773 extern void free_uid(struct user_struct *);
774 extern void switch_uid(struct user_struct *);
776 #include <asm/current.h>
778 extern unsigned long itimer_ticks;
779 extern unsigned long itimer_next;
780 extern void do_timer(struct pt_regs *);
782 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
783 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
784 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
785 unsigned long clone_flags));
787 extern void kick_process(struct task_struct *tsk);
789 static inline void kick_process(struct task_struct *tsk) { }
791 extern void FASTCALL(sched_fork(task_t * p));
792 extern void FASTCALL(sched_exit(task_t * p));
794 extern int in_group_p(gid_t);
795 extern int in_egroup_p(gid_t);
797 extern void proc_caches_init(void);
798 extern void flush_signals(struct task_struct *);
799 extern void flush_signal_handlers(struct task_struct *, int force_default);
800 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
802 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
807 spin_lock_irqsave(&tsk->sighand->siglock, flags);
808 ret = dequeue_signal(tsk, mask, info);
809 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
814 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
816 extern void unblock_all_signals(void);
817 extern void release_task(struct task_struct * p);
818 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
819 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
820 extern int force_sigsegv(int, struct task_struct *);
821 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
822 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
823 extern int kill_pg_info(int, struct siginfo *, pid_t);
824 extern int kill_proc_info(int, struct siginfo *, pid_t);
825 extern void do_notify_parent(struct task_struct *, int);
826 extern void force_sig(int, struct task_struct *);
827 extern void force_sig_specific(int, struct task_struct *);
828 extern int send_sig(int, struct task_struct *, int);
829 extern void zap_other_threads(struct task_struct *p);
830 extern int kill_pg(pid_t, int, int);
831 extern int kill_sl(pid_t, int, int);
832 extern int kill_proc(pid_t, int, int);
833 extern struct sigqueue *sigqueue_alloc(void);
834 extern void sigqueue_free(struct sigqueue *);
835 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
836 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
837 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
838 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
840 /* These can be the second arg to send_sig_info/send_group_sig_info. */
841 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
842 #define SEND_SIG_PRIV ((struct siginfo *) 1)
843 #define SEND_SIG_FORCED ((struct siginfo *) 2)
845 /* True if we are on the alternate signal stack. */
847 static inline int on_sig_stack(unsigned long sp)
849 return (sp - current->sas_ss_sp < current->sas_ss_size);
852 static inline int sas_ss_flags(unsigned long sp)
854 return (current->sas_ss_size == 0 ? SS_DISABLE
855 : on_sig_stack(sp) ? SS_ONSTACK : 0);
859 #ifdef CONFIG_SECURITY
860 /* code is in security.c */
861 extern int capable(int cap);
863 static inline int capable(int cap)
865 if (cap_raised(current->cap_effective, cap)) {
866 current->flags |= PF_SUPERPRIV;
875 * Routines for handling mm_structs
877 extern struct mm_struct * mm_alloc(void);
879 /* mmdrop drops the mm and the page tables */
880 extern void FASTCALL(__mmdrop(struct mm_struct *));
881 static inline void mmdrop(struct mm_struct * mm)
883 if (atomic_dec_and_test(&mm->mm_count))
887 /* mmput gets rid of the mappings and all user-space */
888 extern void mmput(struct mm_struct *);
889 /* Grab a reference to a task's mm, if it is not already going away */
890 extern struct mm_struct *get_task_mm(struct task_struct *task);
891 /* Remove the current tasks stale references to the old mm_struct */
892 extern void mm_release(struct task_struct *, struct mm_struct *);
894 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
895 extern void flush_thread(void);
896 extern void exit_thread(void);
898 extern void exit_mm(struct task_struct *);
899 extern void exit_files(struct task_struct *);
900 extern void exit_signal(struct task_struct *);
901 extern void __exit_signal(struct task_struct *);
902 extern void exit_sighand(struct task_struct *);
903 extern void __exit_sighand(struct task_struct *);
904 extern void exit_itimers(struct signal_struct *);
906 extern NORET_TYPE void do_group_exit(int);
908 extern void reparent_to_init(void);
909 extern void daemonize(const char *, ...);
910 extern int allow_signal(int);
911 extern int disallow_signal(int);
912 extern task_t *child_reaper;
914 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
915 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
916 task_t *fork_idle(int);
918 extern void set_task_comm(struct task_struct *tsk, char *from);
919 extern void get_task_comm(char *to, struct task_struct *tsk);
922 extern void wait_task_inactive(task_t * p);
924 #define wait_task_inactive(p) do { } while (0)
927 #define remove_parent(p) list_del_init(&(p)->sibling)
928 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
930 #define REMOVE_LINKS(p) do { \
931 if (thread_group_leader(p)) \
932 list_del_init(&(p)->tasks); \
936 #define SET_LINKS(p) do { \
937 if (thread_group_leader(p)) \
938 list_add_tail(&(p)->tasks,&init_task.tasks); \
939 add_parent(p, (p)->parent); \
942 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
943 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
945 #define for_each_process(p) \
946 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
949 * Careful: do_each_thread/while_each_thread is a double loop so
950 * 'break' will not work as expected - use goto instead.
952 #define do_each_thread(g, t) \
953 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
955 #define while_each_thread(g, t) \
956 while ((t = next_thread(t)) != g)
958 extern task_t * FASTCALL(next_thread(const task_t *p));
960 #define thread_group_leader(p) (p->pid == p->tgid)
962 static inline int thread_group_empty(task_t *p)
964 return list_empty(&p->pids[PIDTYPE_TGID].pid_list);
967 #define delay_group_leader(p) \
968 (thread_group_leader(p) && !thread_group_empty(p))
970 extern void unhash_process(struct task_struct *p);
973 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm and
974 * synchronises with wait4().
976 * Nests both inside and outside of read_lock(&tasklist_lock).
977 * It must not be nested with write_lock_irq(&tasklist_lock),
978 * neither inside nor outside.
980 static inline void task_lock(struct task_struct *p)
982 spin_lock(&p->alloc_lock);
985 static inline void task_unlock(struct task_struct *p)
987 spin_unlock(&p->alloc_lock);
990 /* set thread flags in other task's structures
991 * - see asm/thread_info.h for TIF_xxxx flags available
993 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
995 set_ti_thread_flag(tsk->thread_info,flag);
998 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1000 clear_ti_thread_flag(tsk->thread_info,flag);
1003 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1005 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
1008 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1010 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
1013 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1015 return test_ti_thread_flag(tsk->thread_info,flag);
1018 static inline void set_tsk_need_resched(struct task_struct *tsk)
1020 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1023 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1025 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1028 static inline int signal_pending(struct task_struct *p)
1030 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1033 static inline int need_resched(void)
1035 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1038 extern void __cond_resched(void);
1040 static inline void cond_resched(void)
1042 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
1043 __might_sleep(__FILE__, __LINE__, 0);
1049 * cond_resched_lock() - if a reschedule is pending, drop the given lock,
1050 * call schedule, and on return reacquire the lock.
1052 * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
1053 * operations here to prevent schedule() from being called twice (once via
1054 * spin_unlock(), once by hand).
1056 extern void __cond_resched_lock(spinlock_t * lock);
1058 static inline void cond_resched_lock(spinlock_t * lock)
1060 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
1061 __might_sleep(__FILE__, __LINE__, 1);
1063 __cond_resched_lock(lock);
1066 /* Reevaluate whether the task has signals pending delivery.
1067 This is required every time the blocked sigset_t changes.
1068 callers must hold sighand->siglock. */
1070 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
1071 extern void recalc_sigpending(void);
1073 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1076 * Wrappers for p->thread_info->cpu access. No-op on UP.
1080 static inline unsigned int task_cpu(const struct task_struct *p)
1082 return p->thread_info->cpu;
1085 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1087 p->thread_info->cpu = cpu;
1092 static inline unsigned int task_cpu(const struct task_struct *p)
1097 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1101 #endif /* CONFIG_SMP */
1103 /* API for registering delay info */
1104 #ifdef CONFIG_DELAY_ACCT
1106 #define test_delay_flag(tsk,flg) ((tsk)->flags & (flg))
1107 #define set_delay_flag(tsk,flg) ((tsk)->flags |= (flg))
1108 #define clear_delay_flag(tsk,flg) ((tsk)->flags &= ~(flg))
1110 #define def_delay_var(var) unsigned long long var
1111 #define get_delay(tsk,field) ((tsk)->delays.field)
1113 #define start_delay(var) ((var) = sched_clock())
1114 #define start_delay_set(var,flg) (set_delay_flag(current,flg),(var) = sched_clock())
1116 #define inc_delay(tsk,field) (((tsk)->delays.field)++)
1118 /* because of hardware timer drifts in SMPs and task continue on different cpu
1119 * then where the start_ts was taken there is a possibility that
1120 * end_ts < start_ts by some usecs. In this case we ignore the diff
1121 * and add nothing to the total.
1124 #define test_ts_integrity(start_ts,end_ts) (likely((end_ts) > (start_ts)))
1126 #define test_ts_integrity(start_ts,end_ts) (1)
1129 #define add_delay_ts(tsk,field,start_ts,end_ts) \
1130 do { if (test_ts_integrity(start_ts,end_ts)) (tsk)->delays.field += ((end_ts)-(start_ts)); } while (0)
1132 #define add_delay_clear(tsk,field,start_ts,flg) \
1134 unsigned long long now = sched_clock();\
1135 add_delay_ts(tsk,field,start_ts,now); \
1136 clear_delay_flag(tsk,flg); \
1139 static inline void add_io_delay(unsigned long long dstart)
1141 struct task_struct * tsk = current;
1142 unsigned long long now = sched_clock();
1143 unsigned long long val;
1145 if (test_ts_integrity(dstart,now))
1149 if (test_delay_flag(tsk,PF_MEMIO)) {
1150 tsk->delays.mem_iowait_total += val;
1151 tsk->delays.num_memwaits++;
1153 tsk->delays.iowait_total += val;
1154 tsk->delays.num_iowaits++;
1156 clear_delay_flag(tsk,PF_IOWAIT);
1159 inline static void init_delays(struct task_struct *tsk)
1161 memset((void*)&tsk->delays,0,sizeof(tsk->delays));
1166 #define test_delay_flag(tsk,flg) (0)
1167 #define set_delay_flag(tsk,flg) do { } while (0)
1168 #define clear_delay_flag(tsk,flg) do { } while (0)
1170 #define def_delay_var(var)
1171 #define get_delay(tsk,field) (0)
1173 #define start_delay(var) do { } while (0)
1174 #define start_delay_set(var,flg) do { } while (0)
1176 #define inc_delay(tsk,field) do { } while (0)
1177 #define add_delay_ts(tsk,field,start_ts,now) do { } while (0)
1178 #define add_delay_clear(tsk,field,start_ts,flg) do { } while (0)
1179 #define add_io_delay(dstart) do { } while (0)
1180 #define init_delays(tsk) do { } while (0)
1185 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1186 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1188 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1190 mm->mmap_base = TASK_UNMAPPED_BASE;
1191 mm->get_unmapped_area = arch_get_unmapped_area;
1192 mm->unmap_area = arch_unmap_area;
1196 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1197 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1199 #endif /* __KERNEL__ */