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>
35 extern int exec_shield;
36 extern int exec_shield_randomize;
37 extern int print_fatal_signals;
42 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
43 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
44 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
45 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
46 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
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 // DECLARE_PER_CPU(struct runqueue, runqueues); -- removed after ckrm cpu v7 merge
98 extern int nr_processes(void);
99 extern unsigned long nr_running(void);
100 extern unsigned long nr_uninterruptible(void);
101 extern unsigned long nr_iowait(void);
103 #include <linux/time.h>
104 #include <linux/param.h>
105 #include <linux/resource.h>
106 #include <linux/timer.h>
108 #include <asm/processor.h>
110 #define TASK_RUNNING 0
111 #define TASK_INTERRUPTIBLE 1
112 #define TASK_UNINTERRUPTIBLE 2
113 #define TASK_STOPPED 4
114 #define TASK_TRACED 8
115 #define EXIT_ZOMBIE 16
117 #define TASK_ONHOLD 64
119 #define __set_task_state(tsk, state_value) \
120 do { (tsk)->state = (state_value); } while (0)
121 #define set_task_state(tsk, state_value) \
122 set_mb((tsk)->state, (state_value))
124 #define __set_current_state(state_value) \
125 do { current->state = (state_value); } while (0)
126 #define set_current_state(state_value) \
127 set_mb(current->state, (state_value))
130 * Scheduling policies
132 #define SCHED_NORMAL 0
142 #include <linux/taskdelays.h>
143 #include <linux/spinlock.h>
146 * This serializes "schedule()" and also protects
147 * the run-queue from deletions/modifications (but
148 * _adding_ to the beginning of the run-queue has
151 extern rwlock_t tasklist_lock;
152 extern spinlock_t mmlist_lock;
154 typedef struct task_struct task_t;
156 extern void sched_init(void);
157 extern void sched_init_smp(void);
158 extern void init_idle(task_t *idle, int cpu);
160 extern cpumask_t nohz_cpu_mask;
162 extern void show_state(void);
163 extern void show_regs(struct pt_regs *);
166 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
167 * task), SP is the stack pointer of the first frame that should be shown in the back
168 * trace (or NULL if the entire call-chain of the task should be shown).
170 extern void show_stack(struct task_struct *task, unsigned long *sp);
172 void io_schedule(void);
173 long io_schedule_timeout(long timeout);
175 extern void cpu_init (void);
176 extern void trap_init(void);
177 extern void update_process_times(int user);
178 extern void scheduler_tick(int user_tick, int system);
179 extern unsigned long cache_decay_ticks;
181 /* Attach to any functions which should be ignored in wchan output. */
182 #define __sched __attribute__((__section__(".sched.text")))
183 /* Is this address in the __sched functions? */
184 extern int in_sched_functions(unsigned long addr);
186 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
187 extern signed long FASTCALL(schedule_timeout(signed long timeout));
188 asmlinkage void schedule(void);
192 /* Maximum number of active map areas.. This is a random (large) number */
193 #define DEFAULT_MAX_MAP_COUNT 65536
195 extern int sysctl_max_map_count;
197 #include <linux/aio.h>
200 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
201 unsigned long, unsigned long);
204 arch_get_unmapped_exec_area(struct file *, unsigned long, unsigned long,
205 unsigned long, unsigned long);
207 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
208 unsigned long len, unsigned long pgoff,
209 unsigned long flags);
210 extern void arch_unmap_area(struct vm_area_struct *area);
211 extern void arch_unmap_area_topdown(struct vm_area_struct *area);
215 struct vm_area_struct * mmap; /* list of VMAs */
216 struct rb_root mm_rb;
217 struct vm_area_struct * mmap_cache; /* last find_vma result */
218 unsigned long (*get_unmapped_area) (struct file *filp,
219 unsigned long addr, unsigned long len,
220 unsigned long pgoff, unsigned long flags);
221 unsigned long (*get_unmapped_exec_area) (struct file *filp,
222 unsigned long addr, unsigned long len,
223 unsigned long pgoff, unsigned long flags);
224 void (*unmap_area) (struct vm_area_struct *area);
225 unsigned long mmap_base; /* base of mmap area */
226 unsigned long free_area_cache; /* first hole */
228 atomic_t mm_users; /* How many users with user space? */
229 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
230 int map_count; /* number of VMAs */
231 struct rw_semaphore mmap_sem;
232 spinlock_t page_table_lock; /* Protects page tables, mm->rss, mm->anon_rss */
234 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
235 * together off init_mm.mmlist, and are protected
239 unsigned long start_code, end_code, start_data, end_data;
240 unsigned long start_brk, brk, start_stack;
241 unsigned long arg_start, arg_end, env_start, env_end;
242 unsigned long rss, anon_rss, total_vm, locked_vm, shared_vm;
243 unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes;
245 unsigned long saved_auxv[42]; /* for /proc/PID/auxv */
248 cpumask_t cpu_vm_mask;
250 /* Architecture-specific MM context */
251 mm_context_t context;
252 struct vx_info *mm_vx_info;
254 /* Token based thrashing protection. */
255 unsigned long swap_token_time;
258 /* coredumping support */
260 struct completion *core_startup_done, core_done;
263 rwlock_t ioctx_list_lock;
264 struct kioctx *ioctx_list;
266 struct kioctx default_kioctx;
267 #ifdef CONFIG_CKRM_RES_MEM
268 struct ckrm_mem_res *memclass;
269 struct list_head tasklist; /* list of all tasks sharing this address space */
270 spinlock_t peertask_lock; /* protect above tasklist */
274 struct sighand_struct {
276 struct k_sigaction action[_NSIG];
281 * NOTE! "signal_struct" does not have it's own
282 * locking, because a shared signal_struct always
283 * implies a shared sighand_struct, so locking
284 * sighand_struct is always a proper superset of
285 * the locking of signal_struct.
287 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;
336 * We don't bother to synchronize most readers of this at all,
337 * because there is no reader checking a limit that actually needs
338 * to get both rlim_cur and rlim_max atomically, and either one
339 * alone is a single word that can safely be read normally.
340 * getrlimit/setrlimit use task_lock(current->group_leader) to
341 * protect this instead of the siglock, because they really
342 * have no need to disable irqs.
344 struct rlimit rlim[RLIM_NLIMITS];
348 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
349 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
350 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
351 * are inverted: lower p->prio value means higher priority.
353 * The MAX_USER_RT_PRIO value allows the actual maximum
354 * RT priority to be separate from the value exported to
355 * user-space. This allows kernel threads to set their
356 * priority to a value higher than any user task. Note:
357 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
360 #define MAX_USER_RT_PRIO 100
361 #define MAX_RT_PRIO MAX_USER_RT_PRIO
363 #define MAX_PRIO (MAX_RT_PRIO + 40)
365 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
368 * Some day this will be a full-fledged user tracking system..
371 atomic_t __count; /* reference count */
372 atomic_t processes; /* How many processes does this user have? */
373 atomic_t files; /* How many open files does this user have? */
374 atomic_t sigpending; /* How many pending signals does this user have? */
375 /* protected by mq_lock */
376 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
377 unsigned long locked_shm; /* How many pages of mlocked shm ? */
380 struct key *uid_keyring; /* UID specific keyring */
381 struct key *session_keyring; /* UID's default session keyring */
384 /* Hash table maintenance information */
385 struct list_head uidhash_list;
390 extern struct user_struct *find_user(xid_t, uid_t);
392 extern struct user_struct root_user;
393 #define INIT_USER (&root_user)
395 typedef struct prio_array prio_array_t;
396 struct backing_dev_info;
397 struct reclaim_state;
399 #ifdef CONFIG_SCHEDSTATS
401 /* cumulative counters */
402 unsigned long cpu_time, /* time spent on the cpu */
403 run_delay, /* time spent waiting on a runqueue */
404 pcnt; /* # of timeslices run on this cpu */
407 unsigned long last_arrival, /* when we last ran on a cpu */
408 last_queued; /* when we were last queued to run */
411 extern struct file_operations proc_schedstat_operations;
423 * sched-domains (multiprocessor balancing) declarations:
426 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
428 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
429 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
430 #define SD_BALANCE_EXEC 4 /* Balance on exec */
431 #define SD_WAKE_IDLE 8 /* Wake to idle CPU on task wakeup */
432 #define SD_WAKE_AFFINE 16 /* Wake task to waking CPU */
433 #define SD_WAKE_BALANCE 32 /* Perform balancing at task wakeup */
434 #define SD_SHARE_CPUPOWER 64 /* Domain members share cpu power */
437 struct sched_group *next; /* Must be a circular list */
441 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
442 * single CPU. This is read only (except for setup, hotplug CPU).
444 unsigned long cpu_power;
447 struct sched_domain {
448 /* These fields must be setup */
449 struct sched_domain *parent; /* top domain must be null terminated */
450 struct sched_group *groups; /* the balancing groups of the domain */
451 cpumask_t span; /* span of all CPUs in this domain */
452 unsigned long min_interval; /* Minimum balance interval ms */
453 unsigned long max_interval; /* Maximum balance interval ms */
454 unsigned int busy_factor; /* less balancing by factor if busy */
455 unsigned int imbalance_pct; /* No balance until over watermark */
456 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
457 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
458 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
459 int flags; /* See SD_* */
461 /* Runtime fields. */
462 unsigned long last_balance; /* init to jiffies. units in jiffies */
463 unsigned int balance_interval; /* initialise to 1. units in ms. */
464 unsigned int nr_balance_failed; /* initialise to 0 */
466 #ifdef CONFIG_SCHEDSTATS
467 /* load_balance() stats */
468 unsigned long lb_cnt[MAX_IDLE_TYPES];
469 unsigned long lb_failed[MAX_IDLE_TYPES];
470 unsigned long lb_imbalance[MAX_IDLE_TYPES];
471 unsigned long lb_nobusyg[MAX_IDLE_TYPES];
472 unsigned long lb_nobusyq[MAX_IDLE_TYPES];
474 /* sched_balance_exec() stats */
475 unsigned long sbe_attempts;
476 unsigned long sbe_pushed;
478 /* try_to_wake_up() stats */
479 unsigned long ttwu_wake_affine;
480 unsigned long ttwu_wake_balance;
484 #ifdef ARCH_HAS_SCHED_DOMAIN
485 /* Useful helpers that arch setup code may use. Defined in kernel/sched.c */
486 extern cpumask_t cpu_isolated_map;
487 extern void init_sched_build_groups(struct sched_group groups[],
488 cpumask_t span, int (*group_fn)(int cpu));
489 extern void cpu_attach_domain(struct sched_domain *sd, int cpu);
490 #endif /* ARCH_HAS_SCHED_DOMAIN */
491 #endif /* CONFIG_SMP */
494 struct io_context; /* See blkdev.h */
495 void exit_io_context(void);
497 #define NGROUPS_SMALL 32
498 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
502 gid_t small_block[NGROUPS_SMALL];
508 * get_group_info() must be called with the owning task locked (via task_lock())
509 * when task != current. The reason being that the vast majority of callers are
510 * looking at current->group_info, which can not be changed except by the
511 * current task. Changing current->group_info requires the task lock, too.
513 #define get_group_info(group_info) do { \
514 atomic_inc(&(group_info)->usage); \
517 #define put_group_info(group_info) do { \
518 if (atomic_dec_and_test(&(group_info)->usage)) \
519 groups_free(group_info); \
522 struct group_info *groups_alloc(int gidsetsize);
523 void groups_free(struct group_info *group_info);
524 int set_current_groups(struct group_info *group_info);
525 /* access the groups "array" with this macro */
526 #define GROUP_AT(gi, i) \
527 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
530 struct audit_context; /* See audit.c */
533 #ifdef CONFIG_CKRM_CPU_SCHEDULE
535 * ckrm_cpu_demand_stat - used to track the cpu demand of a task/class
536 * @run: how much time it has been running since the counter started
537 * @total: total time since the counter started
538 * @last_sleep: the last time it sleeps, last_sleep = 0 when not sleeping
539 * @recalc_interval: how often do we recalculate the cpu_demand
540 * @cpu_demand: moving average of run/total
542 struct ckrm_cpu_demand_stat {
543 unsigned long long run;
544 unsigned long long total;
545 unsigned long long last_sleep;
546 unsigned long long recalc_interval;
547 unsigned long cpu_demand; /*estimated cpu demand */
553 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
554 struct thread_info *thread_info;
556 unsigned long flags; /* per process flags, defined below */
557 unsigned long ptrace;
559 int lock_depth; /* Lock depth */
561 int prio, static_prio;
562 struct list_head run_list;
565 unsigned long sleep_avg;
566 long interactive_credit;
567 unsigned long long timestamp, last_ran;
570 unsigned long policy;
571 cpumask_t cpus_allowed;
572 unsigned int time_slice, first_time_slice;
574 #ifdef CONFIG_SCHEDSTATS
575 struct sched_info sched_info;
578 struct list_head tasks;
580 * ptrace_list/ptrace_children forms the list of my children
581 * that were stolen by a ptracer.
583 struct list_head ptrace_children;
584 struct list_head ptrace_list;
586 struct mm_struct *mm, *active_mm;
589 struct linux_binfmt *binfmt;
591 int exit_code, exit_signal;
592 int pdeath_signal; /* The signal sent when the parent dies */
594 unsigned long personality;
599 * pointers to (original) parent process, youngest child, younger sibling,
600 * older sibling, respectively. (p->father can be replaced with
603 struct task_struct *real_parent; /* real parent process (when being debugged) */
604 struct task_struct *parent; /* parent process */
606 * children/sibling forms the list of my children plus the
607 * tasks I'm ptracing.
609 struct list_head children; /* list of my children */
610 struct list_head sibling; /* linkage in my parent's children list */
611 struct task_struct *group_leader; /* threadgroup leader */
613 /* PID/PID hash table linkage. */
614 struct pid pids[PIDTYPE_MAX];
616 wait_queue_head_t wait_chldexit; /* for wait4() */
617 struct completion *vfork_done; /* for vfork() */
618 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
619 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
621 unsigned long rt_priority;
622 unsigned long it_real_value, it_prof_value, it_virt_value;
623 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
624 struct timer_list real_timer;
625 unsigned long utime, stime;
626 unsigned long nvcsw, nivcsw; /* context switch counts */
627 struct timespec start_time;
628 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
629 unsigned long min_flt, maj_flt;
630 /* process credentials */
631 uid_t uid,euid,suid,fsuid;
632 gid_t gid,egid,sgid,fsgid;
633 struct group_info *group_info;
634 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
635 unsigned keep_capabilities:1;
636 struct user_struct *user;
638 struct key *session_keyring; /* keyring inherited over fork */
639 struct key *process_keyring; /* keyring private to this process (CLONE_THREAD) */
640 struct key *thread_keyring; /* keyring private to this thread */
642 unsigned short used_math;
644 /* file system info */
645 int link_count, total_link_count;
647 struct sysv_sem sysvsem;
648 /* CPU-specific state of this task */
649 struct thread_struct thread;
650 /* filesystem information */
651 struct fs_struct *fs;
652 /* open file information */
653 struct files_struct *files;
655 struct namespace *namespace;
656 /* signal handlers */
657 struct signal_struct *signal;
658 struct sighand_struct *sighand;
659 sigset_t blocked, real_blocked;
660 struct sigpending pending;
662 unsigned long sas_ss_sp;
664 int (*notifier)(void *priv);
666 sigset_t *notifier_mask;
670 void (*tux_exit)(void);
674 struct audit_context *audit_context;
676 /* vserver context data */
678 struct vx_info *vx_info;
680 /* vserver network data */
682 struct nx_info *nx_info;
684 /* Thread group tracking */
687 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
688 spinlock_t alloc_lock;
689 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
690 spinlock_t proc_lock;
691 /* context-switch lock */
692 spinlock_t switch_lock;
694 /* journalling filesystem info */
698 struct reclaim_state *reclaim_state;
700 struct dentry *proc_dentry;
701 struct backing_dev_info *backing_dev_info;
703 struct io_context *io_context;
707 unsigned long ptrace_message;
708 siginfo_t *last_siginfo; /* For ptrace use. */
710 * current io wait handle: wait queue entry to use for io waits
711 * If this thread is processing aio, this points at the waitqueue
712 * inside the currently handled kiocb. It may be NULL (i.e. default
713 * to a stack based synchronous wait) if its doing sync IO.
715 wait_queue_t *io_wait;
717 struct mempolicy *mempolicy;
718 short il_next; /* could be shared with used_math */
722 spinlock_t ckrm_tsklock;
724 #ifdef CONFIG_CKRM_TYPE_TASKCLASS
725 // .. Hubertus should change to CONFIG_CKRM_TYPE_TASKCLASS
726 struct ckrm_task_class *taskclass;
727 struct list_head taskclass_link;
728 #ifdef CONFIG_CKRM_CPU_SCHEDULE
729 struct ckrm_cpu_class *cpu_class;
730 //track cpu demand of this task
731 struct ckrm_cpu_demand_stat demand_stat;
732 #endif //CONFIG_CKRM_CPU_SCHEDULE
733 #endif // CONFIG_CKRM_TYPE_TASKCLASS
734 #ifdef CONFIG_CKRM_RES_MEM
735 struct list_head mm_peers; // list of tasks using same mm_struct
736 #endif // CONFIG_CKRM_RES_MEM
737 #endif // CONFIG_CKRM
738 struct task_delay_info delays;
741 static inline pid_t process_group(struct task_struct *tsk)
743 return tsk->signal->pgrp;
747 * pid_alive - check that a task structure is not stale
748 * @p: Task structure to be checked.
750 * Test if a process is not yet dead (at most zombie state)
751 * If pid_alive fails, then pointers within the task structure
752 * can be stale and must not be dereferenced.
754 static inline int pid_alive(struct task_struct *p)
756 return p->pids[PIDTYPE_PID].nr != 0;
759 extern void free_task(struct task_struct *tsk);
760 extern void __put_task_struct(struct task_struct *tsk);
761 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
762 #define put_task_struct(tsk) \
763 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
768 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
769 /* Not implemented yet, only for 486*/
770 #define PF_STARTING 0x00000002 /* being created */
771 #define PF_EXITING 0x00000004 /* getting shut down */
772 #define PF_DEAD 0x00000008 /* Dead */
773 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
774 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
775 #define PF_DUMPCORE 0x00000200 /* dumped core */
776 #define PF_SIGNALED 0x00000400 /* killed by a signal */
777 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
778 #define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */
779 #define PF_FLUSHER 0x00002000 /* responsible for disk writeback */
781 #define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */
782 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
783 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
784 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
785 #define PF_KSWAPD 0x00040000 /* I am kswapd */
786 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
787 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
788 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
789 #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */
790 #define PF_RELOCEXEC 0x00800000 /* relocate shared libraries */
791 #define PF_MEMIO 0x01000000 /* I am potentially doing I/O for mem */
792 #define PF_IOWAIT 0x02000000 /* I am waiting on disk I/O */
795 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
797 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
803 extern unsigned long long sched_clock(void);
805 /* sched_exec is called by processes performing an exec */
807 extern void sched_exec(void);
809 #define sched_exec() {}
812 extern void sched_idle_next(void);
813 extern void set_user_nice(task_t *p, long nice);
814 extern int task_prio(const task_t *p);
815 extern int task_nice(const task_t *p);
816 extern int task_curr(const task_t *p);
817 extern int idle_cpu(int cpu);
822 * The default (Linux) execution domain.
824 extern struct exec_domain default_exec_domain;
827 struct thread_info thread_info;
828 unsigned long stack[THREAD_SIZE/sizeof(long)];
831 #ifndef __HAVE_ARCH_KSTACK_END
832 static inline int kstack_end(void *addr)
834 /* Reliable end of stack detection:
835 * Some APM bios versions misalign the stack
837 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
841 extern union thread_union init_thread_union;
842 extern struct task_struct init_task;
844 extern struct mm_struct init_mm;
847 #define find_task_by_real_pid(nr) \
848 find_task_by_pid_type(PIDTYPE_PID, nr)
849 #define find_task_by_pid(nr) \
850 find_task_by_pid_type(PIDTYPE_PID, \
853 extern struct task_struct *find_task_by_pid_type(int type, int pid);
854 extern void set_special_pids(pid_t session, pid_t pgrp);
855 extern void __set_special_pids(pid_t session, pid_t pgrp);
857 /* per-UID process charging. */
858 extern struct user_struct * alloc_uid(xid_t, uid_t);
859 static inline struct user_struct *get_uid(struct user_struct *u)
861 atomic_inc(&u->__count);
865 extern void free_uid(struct user_struct *);
866 extern void switch_uid(struct user_struct *);
868 #include <asm/current.h>
870 extern void do_timer(struct pt_regs *);
872 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
873 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
874 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
875 unsigned long clone_flags));
877 extern void kick_process(struct task_struct *tsk);
879 static inline void kick_process(struct task_struct *tsk) { }
881 extern void FASTCALL(sched_fork(task_t * p));
882 extern void FASTCALL(sched_exit(task_t * p));
884 extern int in_group_p(gid_t);
885 extern int in_egroup_p(gid_t);
887 extern void proc_caches_init(void);
888 extern void flush_signals(struct task_struct *);
889 extern void flush_signal_handlers(struct task_struct *, int force_default);
890 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
892 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
897 spin_lock_irqsave(&tsk->sighand->siglock, flags);
898 ret = dequeue_signal(tsk, mask, info);
899 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
904 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
906 extern void unblock_all_signals(void);
907 extern void release_task(struct task_struct * p);
908 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
909 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
910 extern int force_sigsegv(int, struct task_struct *);
911 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
912 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
913 extern int kill_pg_info(int, struct siginfo *, pid_t);
914 extern int kill_proc_info(int, struct siginfo *, pid_t);
915 extern void do_notify_parent(struct task_struct *, int);
916 extern void force_sig(int, struct task_struct *);
917 extern void force_sig_specific(int, struct task_struct *);
918 extern int send_sig(int, struct task_struct *, int);
919 extern void zap_other_threads(struct task_struct *p);
920 extern int kill_pg(pid_t, int, int);
921 extern int kill_sl(pid_t, int, int);
922 extern int kill_proc(pid_t, int, int);
923 extern struct sigqueue *sigqueue_alloc(void);
924 extern void sigqueue_free(struct sigqueue *);
925 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
926 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
927 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
928 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
930 /* These can be the second arg to send_sig_info/send_group_sig_info. */
931 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
932 #define SEND_SIG_PRIV ((struct siginfo *) 1)
933 #define SEND_SIG_FORCED ((struct siginfo *) 2)
935 /* True if we are on the alternate signal stack. */
937 static inline int on_sig_stack(unsigned long sp)
939 return (sp - current->sas_ss_sp < current->sas_ss_size);
942 static inline int sas_ss_flags(unsigned long sp)
944 return (current->sas_ss_size == 0 ? SS_DISABLE
945 : on_sig_stack(sp) ? SS_ONSTACK : 0);
949 #ifdef CONFIG_SECURITY
950 /* code is in security.c */
951 extern int capable(int cap);
953 static inline int capable(int cap)
955 if (cap_raised(current->cap_effective, cap)) {
956 current->flags |= PF_SUPERPRIV;
965 * Routines for handling mm_structs
967 extern struct mm_struct * mm_alloc(void);
969 /* mmdrop drops the mm and the page tables */
970 extern void FASTCALL(__mmdrop(struct mm_struct *));
971 static inline void mmdrop(struct mm_struct * mm)
973 if (atomic_dec_and_test(&mm->mm_count))
977 /* mmput gets rid of the mappings and all user-space */
978 extern void mmput(struct mm_struct *);
979 /* Grab a reference to a task's mm, if it is not already going away */
980 extern struct mm_struct *get_task_mm(struct task_struct *task);
981 /* Remove the current tasks stale references to the old mm_struct */
982 extern void mm_release(struct task_struct *, struct mm_struct *);
984 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
985 extern void flush_thread(void);
986 extern void exit_thread(void);
988 extern void exit_mm(struct task_struct *);
989 extern void exit_files(struct task_struct *);
990 extern void exit_signal(struct task_struct *);
991 extern void __exit_signal(struct task_struct *);
992 extern void exit_sighand(struct task_struct *);
993 extern void __exit_sighand(struct task_struct *);
994 extern void exit_itimers(struct signal_struct *);
996 extern NORET_TYPE void do_group_exit(int);
998 extern void reparent_to_init(void);
999 extern void daemonize(const char *, ...);
1000 extern int allow_signal(int);
1001 extern int disallow_signal(int);
1002 extern task_t *child_reaper;
1004 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1005 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1006 task_t *fork_idle(int);
1008 extern void set_task_comm(struct task_struct *tsk, char *from);
1009 extern void get_task_comm(char *to, struct task_struct *tsk);
1012 extern void wait_task_inactive(task_t * p);
1014 #define wait_task_inactive(p) do { } while (0)
1017 #define remove_parent(p) list_del_init(&(p)->sibling)
1018 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
1020 #define REMOVE_LINKS(p) do { \
1021 if (thread_group_leader(p)) \
1022 list_del_init(&(p)->tasks); \
1026 #define SET_LINKS(p) do { \
1027 if (thread_group_leader(p)) \
1028 list_add_tail(&(p)->tasks,&init_task.tasks); \
1029 add_parent(p, (p)->parent); \
1032 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
1033 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
1035 #define for_each_process(p) \
1036 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1039 * Careful: do_each_thread/while_each_thread is a double loop so
1040 * 'break' will not work as expected - use goto instead.
1042 #define do_each_thread(g, t) \
1043 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1045 #define while_each_thread(g, t) \
1046 while ((t = next_thread(t)) != g)
1048 extern task_t * FASTCALL(next_thread(const task_t *p));
1050 #define thread_group_leader(p) (p->pid == p->tgid)
1052 static inline int thread_group_empty(task_t *p)
1054 return list_empty(&p->pids[PIDTYPE_TGID].pid_list);
1057 #define delay_group_leader(p) \
1058 (thread_group_leader(p) && !thread_group_empty(p))
1060 extern void unhash_process(struct task_struct *p);
1063 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring
1064 * subscriptions and synchronises with wait4(). Also used in procfs.
1066 * Nests both inside and outside of read_lock(&tasklist_lock).
1067 * It must not be nested with write_lock_irq(&tasklist_lock),
1068 * neither inside nor outside.
1070 static inline void task_lock(struct task_struct *p)
1072 spin_lock(&p->alloc_lock);
1075 static inline void task_unlock(struct task_struct *p)
1077 spin_unlock(&p->alloc_lock);
1080 /* set thread flags in other task's structures
1081 * - see asm/thread_info.h for TIF_xxxx flags available
1083 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1085 set_ti_thread_flag(tsk->thread_info,flag);
1088 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1090 clear_ti_thread_flag(tsk->thread_info,flag);
1093 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1095 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
1098 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1100 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
1103 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1105 return test_ti_thread_flag(tsk->thread_info,flag);
1108 static inline void set_tsk_need_resched(struct task_struct *tsk)
1110 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1113 static inline void clear_tsk_need_resched(struct task_struct *tsk)
1115 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1118 static inline int signal_pending(struct task_struct *p)
1120 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1123 static inline int need_resched(void)
1125 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1128 extern void __cond_resched(void);
1129 static inline void cond_resched(void)
1136 * cond_resched_lock() - if a reschedule is pending, drop the given lock,
1137 * call schedule, and on return reacquire the lock.
1139 * This works OK both with and without CONFIG_PREEMPT. We do strange low-level
1140 * operations here to prevent schedule() from being called twice (once via
1141 * spin_unlock(), once by hand).
1143 static inline void cond_resched_lock(spinlock_t * lock)
1145 if (need_resched()) {
1146 _raw_spin_unlock(lock);
1147 preempt_enable_no_resched();
1153 /* Reevaluate whether the task has signals pending delivery.
1154 This is required every time the blocked sigset_t changes.
1155 callers must hold sighand->siglock. */
1157 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
1158 extern void recalc_sigpending(void);
1160 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1163 * Wrappers for p->thread_info->cpu access. No-op on UP.
1167 static inline unsigned int task_cpu(const struct task_struct *p)
1169 return p->thread_info->cpu;
1172 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1174 p->thread_info->cpu = cpu;
1179 static inline unsigned int task_cpu(const struct task_struct *p)
1184 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1188 #endif /* CONFIG_SMP */
1190 /* API for registering delay info */
1191 #ifdef CONFIG_DELAY_ACCT
1193 #define test_delay_flag(tsk,flg) ((tsk)->flags & (flg))
1194 #define set_delay_flag(tsk,flg) ((tsk)->flags |= (flg))
1195 #define clear_delay_flag(tsk,flg) ((tsk)->flags &= ~(flg))
1197 #define def_delay_var(var) unsigned long long var
1198 #define get_delay(tsk,field) ((tsk)->delays.field)
1200 #define start_delay(var) ((var) = sched_clock())
1201 #define start_delay_set(var,flg) (set_delay_flag(current,flg),(var) = sched_clock())
1203 #define inc_delay(tsk,field) (((tsk)->delays.field)++)
1205 /* because of hardware timer drifts in SMPs and task continue on different cpu
1206 * then where the start_ts was taken there is a possibility that
1207 * end_ts < start_ts by some usecs. In this case we ignore the diff
1208 * and add nothing to the total.
1211 #define test_ts_integrity(start_ts,end_ts) (likely((end_ts) > (start_ts)))
1213 #define test_ts_integrity(start_ts,end_ts) (1)
1216 #define add_delay_ts(tsk,field,start_ts,end_ts) \
1217 do { if (test_ts_integrity(start_ts,end_ts)) (tsk)->delays.field += ((end_ts)-(start_ts)); } while (0)
1219 #define add_delay_clear(tsk,field,start_ts,flg) \
1221 unsigned long long now = sched_clock();\
1222 add_delay_ts(tsk,field,start_ts,now); \
1223 clear_delay_flag(tsk,flg); \
1226 static inline void add_io_delay(unsigned long long dstart)
1228 struct task_struct * tsk = current;
1229 unsigned long long now = sched_clock();
1230 unsigned long long val;
1232 if (test_ts_integrity(dstart,now))
1236 if (test_delay_flag(tsk,PF_MEMIO)) {
1237 tsk->delays.mem_iowait_total += val;
1238 tsk->delays.num_memwaits++;
1240 tsk->delays.iowait_total += val;
1241 tsk->delays.num_iowaits++;
1243 clear_delay_flag(tsk,PF_IOWAIT);
1246 inline static void init_delays(struct task_struct *tsk)
1248 memset((void*)&tsk->delays,0,sizeof(tsk->delays));
1253 #define test_delay_flag(tsk,flg) (0)
1254 #define set_delay_flag(tsk,flg) do { } while (0)
1255 #define clear_delay_flag(tsk,flg) do { } while (0)
1257 #define def_delay_var(var)
1258 #define get_delay(tsk,field) (0)
1260 #define start_delay(var) do { } while (0)
1261 #define start_delay_set(var,flg) do { } while (0)
1263 #define inc_delay(tsk,field) do { } while (0)
1264 #define add_delay_ts(tsk,field,start_ts,now) do { } while (0)
1265 #define add_delay_clear(tsk,field,start_ts,flg) do { } while (0)
1266 #define add_io_delay(dstart) do { } while (0)
1267 #define init_delays(tsk) do { } while (0)
1272 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1273 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1275 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1277 mm->mmap_base = TASK_UNMAPPED_BASE;
1278 mm->get_unmapped_area = arch_get_unmapped_area;
1279 mm->unmap_area = arch_unmap_area;
1283 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1284 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1286 #ifdef CONFIG_MAGIC_SYSRQ
1288 extern void normalize_rt_tasks(void);
1292 #endif /* __KERNEL__ */