include/linux/sched.h

   1 #ifndef _LINUX_SCHED_H
   2 #define _LINUX_SCHED_H
   3
   4 #include <asm/param.h>  /* for HZ */
   5
   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>
  16
  17 #include <asm/system.h>
  18 #include <asm/semaphore.h>
  19 #include <asm/page.h>
  20 #include <asm/ptrace.h>
  21 #include <asm/mmu.h>
  22
  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
  33 struct exec_domain;
  34
  35 /*
  36  * cloning flags:
  37  */
  38 #define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
  39 #define CLONE_VM        0x00000100      /* set if VM shared between processes */
  40 #define CLONE_FS        0x00000200      /* set if fs info shared between processes */
  41 #define CLONE_FILES     0x00000400      /* set if open files shared between processes */
  42 #define CLONE_SIGHAND   0x00000800      /* set if signal handlers and blocked signals shared */
  43 #define CLONE_PTRACE    0x00002000      /* set if we want to let tracing continue on the child too */
  44 #define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
  45 #define CLONE_PARENT    0x00008000      /* set if we want to have the same parent as the cloner */
  46 #define CLONE_THREAD    0x00010000      /* Same thread group? */
  47 #define CLONE_NEWNS     0x00020000      /* New namespace group? */
  48 #define CLONE_SYSVSEM   0x00040000      /* share system V SEM_UNDO semantics */
  49 #define CLONE_SETTLS    0x00080000      /* create a new TLS for the child */
  50 #define CLONE_PARENT_SETTID     0x00100000      /* set the TID in the parent */
  51 #define CLONE_CHILD_CLEARTID    0x00200000      /* clear the TID in the child */
  52 #define CLONE_DETACHED          0x00400000      /* Unused, ignored */
  53 #define CLONE_UNTRACED          0x00800000      /* set if the tracing process can't force CLONE_PTRACE on this clone */
  54 #define CLONE_CHILD_SETTID      0x01000000      /* set the TID in the child */
  55 #define CLONE_STOPPED           0x02000000      /* Start in stopped state */
  56
  57 /*
  58  * List of flags we want to share for kernel threads,
  59  * if only because they are not used by them anyway.
  60  */
  61 #define CLONE_KERNEL    (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
  62
  63 /*
  64  * These are the constant used to fake the fixed-point load-average
  65  * counting. Some notes:
  66  *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
  67  *    a load-average precision of 10 bits integer + 11 bits fractional
  68  *  - if you want to count load-averages more often, you need more
  69  *    precision, or rounding will get you. With 2-second counting freq,
  70  *    the EXP_n values would be 1981, 2034 and 2043 if still using only
  71  *    11 bit fractions.
  72  */
  73 extern unsigned long avenrun[];         /* Load averages */
  74
  75 #define FSHIFT          11              /* nr of bits of precision */
  76 #define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
  77 #define LOAD_FREQ       (5*HZ)          /* 5 sec intervals */
  78 #define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
  79 #define EXP_5           2014            /* 1/exp(5sec/5min) */
  80 #define EXP_15          2037            /* 1/exp(5sec/15min) */
  81
  82 #define CALC_LOAD(load,exp,n) \
  83         load *= exp; \
  84         load += n*(FIXED_1-exp); \
  85         load >>= FSHIFT;
  86
  87 #define CT_TO_SECS(x)   ((x) / HZ)
  88 #define CT_TO_USECS(x)  (((x) % HZ) * 1000000/HZ)
  89
  90 extern int nr_threads;
  91 extern int last_pid;
  92 DECLARE_PER_CPU(unsigned long, process_counts);
  93 extern int nr_processes(void);
  94 extern unsigned long nr_running(void);
  95 extern unsigned long nr_uninterruptible(void);
  96 extern unsigned long nr_iowait(void);
  97
  98 #include <linux/time.h>
  99 #include <linux/param.h>
 100 #include <linux/resource.h>
 101 #include <linux/timer.h>
 102
 103 #include <asm/processor.h>
 104
 105 #define TASK_RUNNING            0
 106 #define TASK_INTERRUPTIBLE      1
 107 #define TASK_UNINTERRUPTIBLE    2
 108 #define TASK_STOPPED            4
 109 #define TASK_TRACED             8
 110 #define TASK_ZOMBIE             16
 111 #define TASK_DEAD               32
 112
 113 #define __set_task_state(tsk, state_value)              \
 114         do { (tsk)->state = (state_value); } while (0)
 115 #define set_task_state(tsk, state_value)                \
 116         set_mb((tsk)->state, (state_value))
 117
 118 #define __set_current_state(state_value)                        \
 119         do { current->state = (state_value); } while (0)
 120 #define set_current_state(state_value)          \
 121         set_mb(current->state, (state_value))
 122
 123 /*
 124  * Scheduling policies
 125  */
 126 #define SCHED_NORMAL            0
 127 #define SCHED_FIFO              1
 128 #define SCHED_RR                2
 129
 130 struct sched_param {
 131         int sched_priority;
 132 };
 133
 134 #ifdef __KERNEL__
 135
 136 #include <linux/spinlock.h>
 137
 138 /*
 139  * This serializes "schedule()" and also protects
 140  * the run-queue from deletions/modifications (but
 141  * _adding_ to the beginning of the run-queue has
 142  * a separate lock).
 143  */
 144 extern rwlock_t tasklist_lock;
 145 extern spinlock_t mmlist_lock;
 146
 147 typedef struct task_struct task_t;
 148
 149 extern void sched_init(void);
 150 extern void sched_init_smp(void);
 151 extern void init_idle(task_t *idle, int cpu);
 152
 153 extern cpumask_t nohz_cpu_mask;
 154
 155 extern void show_state(void);
 156 extern void show_regs(struct pt_regs *);
 157
 158 /*
 159  * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
 160  * task), SP is the stack pointer of the first frame that should be shown in the back
 161  * trace (or NULL if the entire call-chain of the task should be shown).
 162  */
 163 extern void show_stack(struct task_struct *task, unsigned long *sp);
 164
 165 void io_schedule(void);
 166 long io_schedule_timeout(long timeout);
 167
 168 extern void cpu_init (void);
 169 extern void trap_init(void);
 170 extern void update_process_times(int user);
 171 extern void scheduler_tick(int user_tick, int system);
 172 extern unsigned long cache_decay_ticks;
 173
 174 /* Attach to any functions which should be ignored in wchan output. */
 175 #define __sched         __attribute__((__section__(".sched.text")))
 176 /* Is this address in the __sched functions? */
 177 extern int in_sched_functions(unsigned long addr);
 178
 179 #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
 180 extern signed long FASTCALL(schedule_timeout(signed long timeout));
 181 asmlinkage void schedule(void);
 182
 183 struct namespace;
 184
 185 /* Maximum number of active map areas.. This is a random (large) number */
 186 #define DEFAULT_MAX_MAP_COUNT   65536
 187
 188 extern int sysctl_max_map_count;
 189
 190 #include <linux/aio.h>
 191
 192 extern unsigned long
 193 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
 194                        unsigned long, unsigned long);
 195 extern unsigned long
 196 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
 197                           unsigned long len, unsigned long pgoff,
 198                           unsigned long flags);
 199 extern void arch_unmap_area(struct vm_area_struct *area);
 200 extern void arch_unmap_area_topdown(struct vm_area_struct *area);
 201
 202
 203 struct mm_struct {
 204         struct vm_area_struct * mmap;           /* list of VMAs */
 205         struct rb_root mm_rb;
 206         struct vm_area_struct * mmap_cache;     /* last find_vma result */
 207         unsigned long (*get_unmapped_area) (struct file *filp,
 208                                 unsigned long addr, unsigned long len,
 209                                 unsigned long pgoff, unsigned long flags);
 210         void (*unmap_area) (struct vm_area_struct *area);
 211         unsigned long mmap_base;                /* base of mmap area */
 212         unsigned long free_area_cache;          /* first hole */
 213         pgd_t * pgd;
 214         atomic_t mm_users;                      /* How many users with user space? */
 215         atomic_t mm_count;                      /* How many references to "struct mm_struct" (users count as 1) */
 216         int map_count;                          /* number of VMAs */
 217         struct rw_semaphore mmap_sem;
 218         spinlock_t page_table_lock;             /* Protects task page tables and mm->rss */
 219
 220         struct list_head mmlist;                /* List of all active mm's.  These are globally strung
 221                                                  * together off init_mm.mmlist, and are protected
 222                                                  * by mmlist_lock
 223                                                  */
 224
 225         unsigned long start_code, end_code, start_data, end_data;
 226         unsigned long start_brk, brk, start_stack;
 227         unsigned long arg_start, arg_end, env_start, env_end;
 228         unsigned long rss, total_vm, locked_vm, shared_vm;
 229         unsigned long exec_vm, stack_vm, reserved_vm, def_flags;
 230
 231         unsigned long saved_auxv[42]; /* for /proc/PID/auxv */
 232
 233         unsigned dumpable:1;
 234         cpumask_t cpu_vm_mask;
 235
 236         /* Architecture-specific MM context */
 237         mm_context_t context;
 238
 239         /* Token based thrashing protection. */
 240         unsigned long swap_token_time;
 241         char recent_pagein;
 242
 243         /* coredumping support */
 244         int core_waiters;
 245         struct completion *core_startup_done, core_done;
 246
 247         /* aio bits */
 248         rwlock_t                ioctx_list_lock;
 249         struct kioctx           *ioctx_list;
 250
 251         struct kioctx           default_kioctx;
 252 };
 253
 254 extern int mmlist_nr;
 255
 256 struct sighand_struct {
 257         atomic_t                count;
 258         struct k_sigaction      action[_NSIG];
 259         spinlock_t              siglock;
 260 };
 261
 262 /*
 263  * NOTE! "signal_struct" does not have it's own
 264  * locking, because a shared signal_struct always
 265  * implies a shared sighand_struct, so locking
 266  * sighand_struct is always a proper superset of
 267  * the locking of signal_struct.
 268  */
 269 struct signal_struct {
 270         atomic_t                count;
 271
 272         /* current thread group signal load-balancing target: */
 273         task_t                  *curr_target;
 274
 275         /* shared signal handling: */
 276         struct sigpending       shared_pending;
 277
 278         /* thread group exit support */
 279         int                     group_exit;
 280         int                     group_exit_code;
 281         /* overloaded:
 282          * - notify group_exit_task when ->count is equal to notify_count
 283          * - everyone except group_exit_task is stopped during signal delivery
 284          *   of fatal signals, group_exit_task processes the signal.
 285          */
 286         struct task_struct      *group_exit_task;
 287         int                     notify_count;
 288
 289         /* thread group stop support, overloads group_exit_code too */
 290         int                     group_stop_count;
 291         /* 1 if group stopped since last SIGCONT, -1 if SIGCONT since report */
 292         int                     stop_state;
 293
 294         /* POSIX.1b Interval Timers */
 295         struct list_head posix_timers;
 296
 297         /* job control IDs */
 298         pid_t pgrp;
 299         pid_t tty_old_pgrp;
 300         pid_t session;
 301         /* boolean value for session group leader */
 302         int leader;
 303
 304         struct tty_struct *tty; /* NULL if no tty */
 305
 306         /*
 307          * Cumulative resource counters for dead threads in the group,
 308          * and for reaped dead child processes forked by this group.
 309          * Live threads maintain their own counters and add to these
 310          * in __exit_signal, except for the group leader.
 311          */
 312         unsigned long utime, stime, cutime, cstime;
 313         unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
 314         unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
 315 };
 316
 317 /*
 318  * Priority of a process goes from 0..MAX_PRIO-1, valid RT
 319  * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
 320  * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
 321  * are inverted: lower p->prio value means higher priority.
 322  *
 323  * The MAX_USER_RT_PRIO value allows the actual maximum
 324  * RT priority to be separate from the value exported to
 325  * user-space.  This allows kernel threads to set their
 326  * priority to a value higher than any user task. Note:
 327  * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
 328  */
 329
 330 #define MAX_USER_RT_PRIO        100
 331 #define MAX_RT_PRIO             MAX_USER_RT_PRIO
 332
 333 #define MAX_PRIO                (MAX_RT_PRIO + 40)
 334
 335 #define rt_task(p)              (unlikely((p)->prio < MAX_RT_PRIO))
 336
 337 /*
 338  * Some day this will be a full-fledged user tracking system..
 339  */
 340 struct user_struct {
 341         atomic_t __count;       /* reference count */
 342         atomic_t processes;     /* How many processes does this user have? */
 343         atomic_t files;         /* How many open files does this user have? */
 344         atomic_t sigpending;    /* How many pending signals does this user have? */
 345         /* protected by mq_lock */
 346         unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
 347         unsigned long locked_shm; /* How many pages of mlocked shm ? */
 348
 349         /* Hash table maintenance information */
 350         struct list_head uidhash_list;
 351         uid_t uid;
 352 };
 353
 354 extern struct user_struct *find_user(uid_t);
 355
 356 extern struct user_struct root_user;
 357 #define INIT_USER (&root_user)
 358
 359 typedef struct prio_array prio_array_t;
 360 struct backing_dev_info;
 361 struct reclaim_state;
 362
 363 /* POSIX.1b interval timer structure. */
 364 struct k_itimer {
 365         struct list_head list;           /* free/ allocate list */
 366         spinlock_t it_lock;
 367         clockid_t it_clock;             /* which timer type */
 368         timer_t it_id;                  /* timer id */
 369         int it_overrun;                 /* overrun on pending signal  */
 370         int it_overrun_last;             /* overrun on last delivered signal */
 371         int it_requeue_pending;          /* waiting to requeue this timer */
 372         int it_sigev_notify;             /* notify word of sigevent struct */
 373         int it_sigev_signo;              /* signo word of sigevent struct */
 374         sigval_t it_sigev_value;         /* value word of sigevent struct */
 375         unsigned long it_incr;          /* interval specified in jiffies */
 376         struct task_struct *it_process; /* process to send signal to */
 377         struct timer_list it_timer;
 378         struct sigqueue *sigq;          /* signal queue entry. */
 379         struct list_head abs_timer_entry; /* clock abs_timer_list */
 380         struct timespec wall_to_prev;   /* wall_to_monotonic used when set */
 381 };
 382
 383 #ifdef CONFIG_SCHEDSTATS
 384 struct sched_info {
 385         /* cumulative counters */
 386         unsigned long   cpu_time,       /* time spent on the cpu */
 387                         run_delay,      /* time spent waiting on a runqueue */
 388                         pcnt;           /* # of timeslices run on this cpu */
 389
 390         /* timestamps */
 391         unsigned long   last_arrival,   /* when we last ran on a cpu */
 392                         last_queued;    /* when we were last queued to run */
 393 };
 394
 395 extern struct file_operations proc_schedstat_operations;
 396 #endif
 397
 398 struct io_context;                      /* See blkdev.h */
 399 void exit_io_context(void);
 400
 401 #define NGROUPS_SMALL           32
 402 #define NGROUPS_PER_BLOCK       ((int)(PAGE_SIZE / sizeof(gid_t)))
 403 struct group_info {
 404         int ngroups;
 405         atomic_t usage;
 406         gid_t small_block[NGROUPS_SMALL];
 407         int nblocks;
 408         gid_t *blocks[0];
 409 };
 410
 411 /*
 412  * get_group_info() must be called with the owning task locked (via task_lock())
 413  * when task != current.  The reason being that the vast majority of callers are
 414  * looking at current->group_info, which can not be changed except by the
 415  * current task.  Changing current->group_info requires the task lock, too.
 416  */
 417 #define get_group_info(group_info) do { \
 418         atomic_inc(&(group_info)->usage); \
 419 } while (0)
 420
 421 #define put_group_info(group_info) do { \
 422         if (atomic_dec_and_test(&(group_info)->usage)) \
 423                 groups_free(group_info); \
 424 } while (0)
 425
 426 struct group_info *groups_alloc(int gidsetsize);
 427 void groups_free(struct group_info *group_info);
 428 int set_current_groups(struct group_info *group_info);
 429 /* access the groups "array" with this macro */
 430 #define GROUP_AT(gi, i) \
 431     ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
 432
 433
 434 struct audit_context;           /* See audit.c */
 435 struct mempolicy;
 436
 437 struct task_struct {
 438         volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
 439         struct thread_info *thread_info;
 440         atomic_t usage;
 441         unsigned long flags;    /* per process flags, defined below */
 442         unsigned long ptrace;
 443
 444         int lock_depth;         /* Lock depth */
 445
 446         int prio, static_prio;
 447         struct list_head run_list;
 448         prio_array_t *array;
 449
 450         unsigned long sleep_avg;
 451         long interactive_credit;
 452         unsigned long long timestamp, last_ran;
 453         int activated;
 454
 455         unsigned long policy;
 456         cpumask_t cpus_allowed;
 457         unsigned int time_slice, first_time_slice;
 458
 459 #ifdef CONFIG_SCHEDSTATS
 460         struct sched_info sched_info;
 461 #endif
 462
 463         struct list_head tasks;
 464         /*
 465          * ptrace_list/ptrace_children forms the list of my children
 466          * that were stolen by a ptracer.
 467          */
 468         struct list_head ptrace_children;
 469         struct list_head ptrace_list;
 470
 471         struct mm_struct *mm, *active_mm;
 472
 473 /* task state */
 474         struct linux_binfmt *binfmt;
 475         int exit_code, exit_signal;
 476         int pdeath_signal;  /*  The signal sent when the parent dies  */
 477         /* ??? */
 478         unsigned long personality;
 479         unsigned did_exec:1;
 480         pid_t pid;
 481         pid_t tgid;
 482         /*
 483          * pointers to (original) parent process, youngest child, younger sibling,
 484          * older sibling, respectively.  (p->father can be replaced with
 485          * p->parent->pid)
 486          */
 487         struct task_struct *real_parent; /* real parent process (when being debugged) */
 488         struct task_struct *parent;     /* parent process */
 489         /*
 490          * children/sibling forms the list of my children plus the
 491          * tasks I'm ptracing.
 492          */
 493         struct list_head children;      /* list of my children */
 494         struct list_head sibling;       /* linkage in my parent's children list */
 495         struct task_struct *group_leader;       /* threadgroup leader */
 496
 497         /* PID/PID hash table linkage. */
 498         struct pid pids[PIDTYPE_MAX];
 499
 500         wait_queue_head_t wait_chldexit;        /* for wait4() */
 501         struct completion *vfork_done;          /* for vfork() */
 502         int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
 503         int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
 504
 505         unsigned long rt_priority;
 506         unsigned long it_real_value, it_prof_value, it_virt_value;
 507         unsigned long it_real_incr, it_prof_incr, it_virt_incr;
 508         struct timer_list real_timer;
 509         unsigned long utime, stime;
 510         unsigned long nvcsw, nivcsw; /* context switch counts */
 511         struct timespec start_time;
 512 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
 513         unsigned long min_flt, maj_flt;
 514 /* process credentials */
 515         uid_t uid,euid,suid,fsuid;
 516         gid_t gid,egid,sgid,fsgid;
 517         struct group_info *group_info;
 518         kernel_cap_t   cap_effective, cap_inheritable, cap_permitted;
 519         unsigned keep_capabilities:1;
 520         struct user_struct *user;
 521 /* limits */
 522         struct rlimit rlim[RLIM_NLIMITS];
 523         unsigned short used_math;
 524         char comm[16];
 525 /* file system info */
 526         int link_count, total_link_count;
 527 /* ipc stuff */
 528         struct sysv_sem sysvsem;
 529 /* CPU-specific state of this task */
 530         struct thread_struct thread;
 531 /* filesystem information */
 532         struct fs_struct *fs;
 533 /* open file information */
 534         struct files_struct *files;
 535 /* namespace */
 536         struct namespace *namespace;
 537 /* signal handlers */
 538         struct signal_struct *signal;
 539         struct sighand_struct *sighand;
 540
 541         sigset_t blocked, real_blocked;
 542         struct sigpending pending;
 543
 544         unsigned long sas_ss_sp;
 545         size_t sas_ss_size;
 546         int (*notifier)(void *priv);
 547         void *notifier_data;
 548         sigset_t *notifier_mask;
 549
 550         void *security;
 551         struct audit_context *audit_context;
 552
 553 /* Thread group tracking */
 554         u32 parent_exec_id;
 555         u32 self_exec_id;
 556 /* Protection of (de-)allocation: mm, files, fs, tty */
 557         spinlock_t alloc_lock;
 558 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
 559         spinlock_t proc_lock;
 560 /* context-switch lock */
 561         spinlock_t switch_lock;
 562
 563 /* journalling filesystem info */
 564         void *journal_info;
 565
 566 /* VM state */
 567         struct reclaim_state *reclaim_state;
 568
 569         struct dentry *proc_dentry;
 570         struct backing_dev_info *backing_dev_info;
 571
 572         struct io_context *io_context;
 573
 574         unsigned long ptrace_message;
 575         siginfo_t *last_siginfo; /* For ptrace use.  */
 576 /*
 577  * current io wait handle: wait queue entry to use for io waits
 578  * If this thread is processing aio, this points at the waitqueue
 579  * inside the currently handled kiocb. It may be NULL (i.e. default
 580  * to a stack based synchronous wait) if its doing sync IO.
 581  */
 582         wait_queue_t *io_wait;
 583 #ifdef CONFIG_NUMA
 584         struct mempolicy *mempolicy;
 585         short il_next;          /* could be shared with used_math */
 586 #endif
 587 };
 588
 589 static inline pid_t process_group(struct task_struct *tsk)
 590 {
 591         return tsk->signal->pgrp;
 592 }
 593
 594 extern void free_task(struct task_struct *tsk);
 595 extern void __put_task_struct(struct task_struct *tsk);
 596 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
 597 #define put_task_struct(tsk) \
 598 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
 599
 600 /*
 601  * Per process flags
 602  */
 603 #define PF_ALIGNWARN    0x00000001      /* Print alignment warning msgs */
 604                                         /* Not implemented yet, only for 486*/
 605 #define PF_STARTING     0x00000002      /* being created */
 606 #define PF_EXITING      0x00000004      /* getting shut down */
 607 #define PF_DEAD         0x00000008      /* Dead */
 608 #define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
 609 #define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
 610 #define PF_DUMPCORE     0x00000200      /* dumped core */
 611 #define PF_SIGNALED     0x00000400      /* killed by a signal */
 612 #define PF_MEMALLOC     0x00000800      /* Allocating memory */
 613 #define PF_MEMDIE       0x00001000      /* Killed for out-of-memory */
 614 #define PF_FLUSHER      0x00002000      /* responsible for disk writeback */
 615
 616 #define PF_FREEZE       0x00004000      /* this task should be frozen for suspend */
 617 #define PF_NOFREEZE     0x00008000      /* this thread should not be frozen */
 618 #define PF_FROZEN       0x00010000      /* frozen for system suspend */
 619 #define PF_FSTRANS      0x00020000      /* inside a filesystem transaction */
 620 #define PF_KSWAPD       0x00040000      /* I am kswapd */
 621 #define PF_SWAPOFF      0x00080000      /* I am in swapoff */
 622 #define PF_LESS_THROTTLE 0x00100000     /* Throttle me less: I clean memory */
 623 #define PF_SYNCWRITE    0x00200000      /* I am doing a sync write */
 624
 625 #ifdef CONFIG_SMP
 626 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
 627 #else
 628 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
 629 {
 630         return 0;
 631 }
 632 #endif
 633
 634 extern unsigned long long sched_clock(void);
 635
 636 /* sched_exec is called by processes performing an exec */
 637 #ifdef CONFIG_SMP
 638 extern void sched_exec(void);
 639 #else
 640 #define sched_exec()   {}
 641 #endif
 642
 643 extern void sched_idle_next(void);
 644 extern void set_user_nice(task_t *p, long nice);
 645 extern int task_prio(const task_t *p);
 646 extern int task_nice(const task_t *p);
 647 extern int task_curr(const task_t *p);
 648 extern int idle_cpu(int cpu);
 649
 650 void yield(void);
 651
 652 /*
 653  * The default (Linux) execution domain.
 654  */
 655 extern struct exec_domain       default_exec_domain;
 656
 657 union thread_union {
 658         struct thread_info thread_info;
 659         unsigned long stack[THREAD_SIZE/sizeof(long)];
 660 };
 661
 662 #ifndef __HAVE_ARCH_KSTACK_END
 663 static inline int kstack_end(void *addr)
 664 {
 665         /* Reliable end of stack detection:
 666          * Some APM bios versions misalign the stack
 667          */
 668         return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
 669 }
 670 #endif
 671
 672 extern union thread_union init_thread_union;
 673 extern struct task_struct init_task;
 674
 675 extern struct   mm_struct init_mm;
 676
 677 #define find_task_by_pid(nr)    find_task_by_pid_type(PIDTYPE_PID, nr)
 678 extern struct task_struct *find_task_by_pid_type(int type, int pid);
 679 extern void set_special_pids(pid_t session, pid_t pgrp);
 680 extern void __set_special_pids(pid_t session, pid_t pgrp);
 681
 682 /* per-UID process charging. */
 683 extern struct user_struct * alloc_uid(uid_t);
 684 static inline struct user_struct *get_uid(struct user_struct *u)
 685 {
 686         atomic_inc(&u->__count);
 687         return u;
 688 }
 689 extern void free_uid(struct user_struct *);
 690 extern void switch_uid(struct user_struct *);
 691
 692 #include <asm/current.h>
 693
 694 extern unsigned long itimer_ticks;
 695 extern unsigned long itimer_next;
 696 extern void do_timer(struct pt_regs *);
 697
 698 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
 699 extern int FASTCALL(wake_up_process(struct task_struct * tsk));
 700 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
 701                                                 unsigned long clone_flags));
 702 #ifdef CONFIG_SMP
 703  extern void kick_process(struct task_struct *tsk);
 704 #else
 705  static inline void kick_process(struct task_struct *tsk) { }
 706 #endif
 707 extern void FASTCALL(sched_fork(task_t * p));
 708 extern void FASTCALL(sched_exit(task_t * p));
 709
 710 extern int in_group_p(gid_t);
 711 extern int in_egroup_p(gid_t);
 712
 713 extern void proc_caches_init(void);
 714 extern void flush_signals(struct task_struct *);
 715 extern void flush_signal_handlers(struct task_struct *, int force_default);
 716 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
 717
 718 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
 719 {
 720         unsigned long flags;
 721         int ret;
 722
 723         spin_lock_irqsave(&tsk->sighand->siglock, flags);
 724         ret = dequeue_signal(tsk, mask, info);
 725         spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
 726
 727         return ret;
 728 }
 729
 730 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
 731                               sigset_t *mask);
 732 extern void unblock_all_signals(void);
 733 extern void release_task(struct task_struct * p);
 734 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
 735 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
 736 extern int force_sigsegv(int, struct task_struct *);
 737 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
 738 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
 739 extern int kill_pg_info(int, struct siginfo *, pid_t);
 740 extern int kill_sl_info(int, struct siginfo *, pid_t);
 741 extern int kill_proc_info(int, struct siginfo *, pid_t);
 742 extern void do_notify_parent(struct task_struct *, int);
 743 extern void force_sig(int, struct task_struct *);
 744 extern void force_sig_specific(int, struct task_struct *);
 745 extern int send_sig(int, struct task_struct *, int);
 746 extern void zap_other_threads(struct task_struct *p);
 747 extern int kill_pg(pid_t, int, int);
 748 extern int kill_sl(pid_t, int, int);
 749 extern int kill_proc(pid_t, int, int);
 750 extern struct sigqueue *sigqueue_alloc(void);
 751 extern void sigqueue_free(struct sigqueue *);
 752 extern int send_sigqueue(int, struct sigqueue *,  struct task_struct *);
 753 extern int send_group_sigqueue(int, struct sigqueue *,  struct task_struct *);
 754 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
 755 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
 756
 757 /* These can be the second arg to send_sig_info/send_group_sig_info.  */
 758 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
 759 #define SEND_SIG_PRIV   ((struct siginfo *) 1)
 760 #define SEND_SIG_FORCED ((struct siginfo *) 2)
 761
 762 /* True if we are on the alternate signal stack.  */
 763
 764 static inline int on_sig_stack(unsigned long sp)
 765 {
 766         return (sp - current->sas_ss_sp < current->sas_ss_size);
 767 }
 768
 769 static inline int sas_ss_flags(unsigned long sp)
 770 {
 771         return (current->sas_ss_size == 0 ? SS_DISABLE
 772                 : on_sig_stack(sp) ? SS_ONSTACK : 0);
 773 }
 774
 775
 776 #ifdef CONFIG_SECURITY
 777 /* code is in security.c */
 778 extern int capable(int cap);
 779 #else
 780 static inline int capable(int cap)
 781 {
 782         if (cap_raised(current->cap_effective, cap)) {
 783                 current->flags |= PF_SUPERPRIV;
 784                 return 1;
 785         }
 786         return 0;
 787 }
 788 #endif
 789
 790 /*
 791  * Routines for handling mm_structs
 792  */
 793 extern struct mm_struct * mm_alloc(void);
 794
 795 /* mmdrop drops the mm and the page tables */
 796 extern void FASTCALL(__mmdrop(struct mm_struct *));
 797 static inline void mmdrop(struct mm_struct * mm)
 798 {
 799         if (atomic_dec_and_test(&mm->mm_count))
 800                 __mmdrop(mm);
 801 }
 802
 803 /* mmput gets rid of the mappings and all user-space */
 804 extern void mmput(struct mm_struct *);
 805 /* Grab a reference to a task's mm, if it is not already going away */
 806 extern struct mm_struct *get_task_mm(struct task_struct *task);
 807 /* Remove the current tasks stale references to the old mm_struct */
 808 extern void mm_release(struct task_struct *, struct mm_struct *);
 809
 810 extern int  copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
 811 extern void flush_thread(void);
 812 extern void exit_thread(void);
 813
 814 extern void exit_mm(struct task_struct *);
 815 extern void exit_files(struct task_struct *);
 816 extern void exit_signal(struct task_struct *);
 817 extern void __exit_signal(struct task_struct *);
 818 extern void exit_sighand(struct task_struct *);
 819 extern void __exit_sighand(struct task_struct *);
 820 extern void exit_itimers(struct signal_struct *);
 821
 822 extern NORET_TYPE void do_group_exit(int);
 823
 824 extern void reparent_to_init(void);
 825 extern void daemonize(const char *, ...);
 826 extern int allow_signal(int);
 827 extern int disallow_signal(int);
 828 extern task_t *child_reaper;
 829
 830 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
 831 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
 832 task_t *fork_idle(int);
 833
 834 extern void set_task_comm(struct task_struct *tsk, char *from);
 835 extern void get_task_comm(char *to, struct task_struct *tsk);
 836
 837 #ifdef CONFIG_SMP
 838 extern void wait_task_inactive(task_t * p);
 839 #else
 840 #define wait_task_inactive(p)   do { } while (0)
 841 #endif
 842
 843 #define remove_parent(p)        list_del_init(&(p)->sibling)
 844 #define add_parent(p, parent)   list_add_tail(&(p)->sibling,&(parent)->children)
 845
 846 #define REMOVE_LINKS(p) do {                                    \
 847         if (thread_group_leader(p))                             \
 848                 list_del_init(&(p)->tasks);                     \
 849         remove_parent(p);                                       \
 850         } while (0)
 851
 852 #define SET_LINKS(p) do {                                       \
 853         if (thread_group_leader(p))                             \
 854                 list_add_tail(&(p)->tasks,&init_task.tasks);    \
 855         add_parent(p, (p)->parent);                             \
 856         } while (0)
 857
 858 #define next_task(p)    list_entry((p)->tasks.next, struct task_struct, tasks)
 859 #define prev_task(p)    list_entry((p)->tasks.prev, struct task_struct, tasks)
 860
 861 #define for_each_process(p) \
 862         for (p = &init_task ; (p = next_task(p)) != &init_task ; )
 863
 864 /*
 865  * Careful: do_each_thread/while_each_thread is a double loop so
 866  *          'break' will not work as expected - use goto instead.
 867  */
 868 #define do_each_thread(g, t) \
 869         for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
 870
 871 #define while_each_thread(g, t) \
 872         while ((t = next_thread(t)) != g)
 873
 874 extern task_t * FASTCALL(next_thread(const task_t *p));
 875
 876 #define thread_group_leader(p)  (p->pid == p->tgid)
 877
 878 static inline int thread_group_empty(task_t *p)
 879 {
 880         return list_empty(&p->pids[PIDTYPE_TGID].pid_list);
 881 }
 882
 883 #define delay_group_leader(p) \
 884                 (thread_group_leader(p) && !thread_group_empty(p))
 885
 886 extern void unhash_process(struct task_struct *p);
 887
 888 /*
 889  * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm and
 890  * synchronises with wait4().
 891  *
 892  * Nests both inside and outside of read_lock(&tasklist_lock).
 893  * It must not be nested with write_lock_irq(&tasklist_lock),
 894  * neither inside nor outside.
 895  */
 896 static inline void task_lock(struct task_struct *p)
 897 {
 898         spin_lock(&p->alloc_lock);
 899 }
 900
 901 static inline void task_unlock(struct task_struct *p)
 902 {
 903         spin_unlock(&p->alloc_lock);
 904 }
 905
 906 /* set thread flags in other task's structures
 907  * - see asm/thread_info.h for TIF_xxxx flags available
 908  */
 909 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
 910 {
 911         set_ti_thread_flag(tsk->thread_info,flag);
 912 }
 913
 914 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
 915 {
 916         clear_ti_thread_flag(tsk->thread_info,flag);
 917 }
 918
 919 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
 920 {
 921         return test_and_set_ti_thread_flag(tsk->thread_info,flag);
 922 }
 923
 924 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
 925 {
 926         return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
 927 }
 928
 929 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
 930 {
 931         return test_ti_thread_flag(tsk->thread_info,flag);
 932 }
 933
 934 static inline void set_tsk_need_resched(struct task_struct *tsk)
 935 {
 936         set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
 937 }
 938
 939 static inline void clear_tsk_need_resched(struct task_struct *tsk)
 940 {
 941         clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
 942 }
 943
 944 static inline int signal_pending(struct task_struct *p)
 945 {
 946         return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
 947 }
 948
 949 static inline int need_resched(void)
 950 {
 951         return unlikely(test_thread_flag(TIF_NEED_RESCHED));
 952 }
 953
 954 extern void __cond_resched(void);
 955 static inline void cond_resched(void)
 956 {
 957         if (need_resched())
 958                 __cond_resched();
 959 }
 960
 961 /*
 962  * cond_resched_lock() - if a reschedule is pending, drop the given lock,
 963  * call schedule, and on return reacquire the lock.
 964  *
 965  * This works OK both with and without CONFIG_PREEMPT.  We do strange low-level
 966  * operations here to prevent schedule() from being called twice (once via
 967  * spin_unlock(), once by hand).
 968  */
 969 static inline void cond_resched_lock(spinlock_t * lock)
 970 {
 971         if (need_resched()) {
 972                 _raw_spin_unlock(lock);
 973                 preempt_enable_no_resched();
 974                 __cond_resched();
 975                 spin_lock(lock);
 976         }
 977 }
 978
 979 /* Reevaluate whether the task has signals pending delivery.
 980    This is required every time the blocked sigset_t changes.
 981    callers must hold sighand->siglock.  */
 982
 983 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
 984 extern void recalc_sigpending(void);
 985
 986 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
 987
 988 /*
 989  * Wrappers for p->thread_info->cpu access. No-op on UP.
 990  */
 991 #ifdef CONFIG_SMP
 992
 993 static inline unsigned int task_cpu(const struct task_struct *p)
 994 {
 995         return p->thread_info->cpu;
 996 }
 997
 998 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
 999 {
1000         p->thread_info->cpu = cpu;
1001 }
1002
1003 #else
1004
1005 static inline unsigned int task_cpu(const struct task_struct *p)
1006 {
1007         return 0;
1008 }
1009
1010 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1011 {
1012 }
1013
1014 #endif /* CONFIG_SMP */
1015
1016 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1017 extern void arch_pick_mmap_layout(struct mm_struct *mm);
1018 #else
1019 static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1020 {
1021         mm->mmap_base = TASK_UNMAPPED_BASE;
1022         mm->get_unmapped_area = arch_get_unmapped_area;
1023         mm->unmap_area = arch_unmap_area;
1024 }
1025 #endif
1026
1027 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1028 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1029 static inline int try_to_freeze(void) { return 0; }//johnson add for new jffs2
1030 #endif /* __KERNEL__ */
1031
1032 #endif