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 #include <linux/errno.h> 17 #include <linux/nodemask.h> 18 19 #include <asm/system.h> 20 #include <asm/semaphore.h> 21 #include <asm/page.h> 22 #include <asm/ptrace.h> 23 #include <asm/mmu.h> 24 #include <asm/cputime.h> 25 26 #include <linux/smp.h> 27 #include <linux/sem.h> 28 #include <linux/signal.h> 29 #include <linux/securebits.h> 30 #include <linux/fs_struct.h> 31 #include <linux/compiler.h> 32 #include <linux/completion.h> 33 #include <linux/pid.h> 34 #include <linux/percpu.h> 35 #include <linux/topology.h> 36 #include <linux/seccomp.h> 37 38 #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */ 39 40 struct exec_domain; 41 42 /* 43 * cloning flags: 44 */ 45 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ 46 #define CLONE_VM 0x00000100 /* set if VM shared between processes */ 47 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ 48 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ 49 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ 50 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ 51 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ 52 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ 53 #define CLONE_THREAD 0x00010000 /* Same thread group? */ 54 #define CLONE_NEWNS 0x00020000 /* New namespace group? */ 55 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ 56 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ 57 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ 58 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ 59 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ 60 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ 61 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ 62 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ 63 64 /* 65 * List of flags we want to share for kernel threads, 66 * if only because they are not used by them anyway. 67 */ 68 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 69 70 /* 71 * These are the constant used to fake the fixed-point load-average 72 * counting. Some notes: 73 * - 11 bit fractions expand to 22 bits by the multiplies: this gives 74 * a load-average precision of 10 bits integer + 11 bits fractional 75 * - if you want to count load-averages more often, you need more 76 * precision, or rounding will get you. With 2-second counting freq, 77 * the EXP_n values would be 1981, 2034 and 2043 if still using only 78 * 11 bit fractions. 79 */ 80 extern unsigned long avenrun[]; /* Load averages */ 81 82 #define FSHIFT 11 /* nr of bits of precision */ 83 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 84 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */ 85 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 86 #define EXP_5 2014 /* 1/exp(5sec/5min) */ 87 #define EXP_15 2037 /* 1/exp(5sec/15min) */ 88 89 #define CALC_LOAD(load,exp,n) \ 90 load *= exp; \ 91 load += n*(FIXED_1-exp); \ 92 load >>= FSHIFT; 93 94 extern unsigned long total_forks; 95 extern int nr_threads; 96 extern int last_pid; 97 DECLARE_PER_CPU(unsigned long, process_counts); 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); 102 103 #include <linux/time.h> 104 #include <linux/param.h> 105 #include <linux/resource.h> 106 #include <linux/timer.h> 107 108 #include <asm/processor.h> 109 110 #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 16 116 #define EXIT_DEAD 32 117 118 #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)) 122 123 #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)) 127 128 /* Task command name length */ 129 #define TASK_COMM_LEN 16 130 131 /* 132 * Scheduling policies 133 */ 134 #define SCHED_NORMAL 0 135 #define SCHED_FIFO 1 136 #define SCHED_RR 2 137 138 struct sched_param { 139 int sched_priority; 140 }; 141 142 #ifdef __KERNEL__ 143 144 #include <linux/spinlock.h> 145 146 /* 147 * This serializes "schedule()" and also protects 148 * the run-queue from deletions/modifications (but 149 * _adding_ to the beginning of the run-queue has 150 * a separate lock). 151 */ 152 extern rwlock_t tasklist_lock; 153 extern spinlock_t mmlist_lock; 154 155 typedef struct task_struct task_t; 156 157 extern void sched_init(void); 158 extern void sched_init_smp(void); 159 extern void init_idle(task_t *idle, int cpu); 160 161 extern cpumask_t nohz_cpu_mask; 162 163 extern void show_state(void); 164 extern void show_regs(struct pt_regs *); 165 166 /* 167 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 168 * task), SP is the stack pointer of the first frame that should be shown in the back 169 * trace (or NULL if the entire call-chain of the task should be shown). 170 */ 171 extern void show_stack(struct task_struct *task, unsigned long *sp); 172 173 void io_schedule(void); 174 long io_schedule_timeout(long timeout); 175 176 extern void cpu_init (void); 177 extern void trap_init(void); 178 extern void update_process_times(int user); 179 extern void scheduler_tick(void); 180 181 #ifdef CONFIG_DETECT_SOFTLOCKUP 182 extern void softlockup_tick(struct pt_regs *regs); 183 extern void spawn_softlockup_task(void); 184 extern void touch_softlockup_watchdog(void); 185 #else 186 static inline void softlockup_tick(struct pt_regs *regs) 187 { 188 } 189 static inline void spawn_softlockup_task(void) 190 { 191 } 192 static inline void touch_softlockup_watchdog(void) 193 { 194 } 195 #endif 196 197 198 /* Attach to any functions which should be ignored in wchan output. */ 199 #define __sched __attribute__((__section__(".sched.text"))) 200 /* Is this address in the __sched functions? */ 201 extern int in_sched_functions(unsigned long addr); 202 203 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 204 extern signed long FASTCALL(schedule_timeout(signed long timeout)); 205 asmlinkage void schedule(void); 206 207 struct namespace; 208 209 /* Maximum number of active map areas.. This is a random (large) number */ 210 #define DEFAULT_MAX_MAP_COUNT 65536 211 212 extern int sysctl_max_map_count; 213 214 #include <linux/aio.h> 215 216 extern unsigned long 217 arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 218 unsigned long, unsigned long); 219 extern unsigned long 220 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 221 unsigned long len, unsigned long pgoff, 222 unsigned long flags); 223 extern void arch_unmap_area(struct mm_struct *, unsigned long); 224 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 225 226 #define set_mm_counter(mm, member, value) (mm)->_##member = (value) 227 #define get_mm_counter(mm, member) ((mm)->_##member) 228 #define add_mm_counter(mm, member, value) (mm)->_##member += (value) 229 #define inc_mm_counter(mm, member) (mm)->_##member++ 230 #define dec_mm_counter(mm, member) (mm)->_##member-- 231 typedef unsigned long mm_counter_t; 232 233 struct mm_struct { 234 struct vm_area_struct * mmap; /* list of VMAs */ 235 struct rb_root mm_rb; 236 struct vm_area_struct * mmap_cache; /* last find_vma result */ 237 unsigned long (*get_unmapped_area) (struct file *filp, 238 unsigned long addr, unsigned long len, 239 unsigned long pgoff, unsigned long flags); 240 void (*unmap_area) (struct mm_struct *mm, unsigned long addr); 241 unsigned long mmap_base; /* base of mmap area */ 242 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ 243 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ 244 pgd_t * pgd; 245 atomic_t mm_users; /* How many users with user space? */ 246 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ 247 int map_count; /* number of VMAs */ 248 struct rw_semaphore mmap_sem; 249 spinlock_t page_table_lock; /* Protects page tables and some counters */ 250 251 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung 252 * together off init_mm.mmlist, and are protected 253 * by mmlist_lock 254 */ 255 256 unsigned long start_code, end_code, start_data, end_data; 257 unsigned long start_brk, brk, start_stack; 258 unsigned long arg_start, arg_end, env_start, env_end; 259 unsigned long total_vm, locked_vm, shared_vm; 260 unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes; 261 262 /* Special counters protected by the page_table_lock */ 263 mm_counter_t _rss; 264 mm_counter_t _anon_rss; 265 266 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ 267 268 unsigned dumpable:2; 269 cpumask_t cpu_vm_mask; 270 271 /* Architecture-specific MM context */ 272 mm_context_t context; 273 274 /* Token based thrashing protection. */ 275 unsigned long swap_token_time; 276 char recent_pagein; 277 278 /* coredumping support */ 279 int core_waiters; 280 struct completion *core_startup_done, core_done; 281 282 /* aio bits */ 283 rwlock_t ioctx_list_lock; 284 struct kioctx *ioctx_list; 285 286 struct kioctx default_kioctx; 287 288 unsigned long hiwater_rss; /* High-water RSS usage */ 289 unsigned long hiwater_vm; /* High-water virtual memory usage */ 290 }; 291 292 struct sighand_struct { 293 atomic_t count; 294 struct k_sigaction action[_NSIG]; 295 spinlock_t siglock; 296 }; 297 298 /* 299 * NOTE! "signal_struct" does not have it's own 300 * locking, because a shared signal_struct always 301 * implies a shared sighand_struct, so locking 302 * sighand_struct is always a proper superset of 303 * the locking of signal_struct. 304 */ 305 struct signal_struct { 306 atomic_t count; 307 atomic_t live; 308 309 wait_queue_head_t wait_chldexit; /* for wait4() */ 310 311 /* current thread group signal load-balancing target: */ 312 task_t *curr_target; 313 314 /* shared signal handling: */ 315 struct sigpending shared_pending; 316 317 /* thread group exit support */ 318 int group_exit_code; 319 /* overloaded: 320 * - notify group_exit_task when ->count is equal to notify_count 321 * - everyone except group_exit_task is stopped during signal delivery 322 * of fatal signals, group_exit_task processes the signal. 323 */ 324 struct task_struct *group_exit_task; 325 int notify_count; 326 327 /* thread group stop support, overloads group_exit_code too */ 328 int group_stop_count; 329 unsigned int flags; /* see SIGNAL_* flags below */ 330 331 /* POSIX.1b Interval Timers */ 332 struct list_head posix_timers; 333 334 /* ITIMER_REAL timer for the process */ 335 struct timer_list real_timer; 336 unsigned long it_real_value, it_real_incr; 337 338 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 339 cputime_t it_prof_expires, it_virt_expires; 340 cputime_t it_prof_incr, it_virt_incr; 341 342 /* job control IDs */ 343 pid_t pgrp; 344 pid_t tty_old_pgrp; 345 pid_t session; 346 /* boolean value for session group leader */ 347 int leader; 348 349 struct tty_struct *tty; /* NULL if no tty */ 350 351 /* 352 * Cumulative resource counters for dead threads in the group, 353 * and for reaped dead child processes forked by this group. 354 * Live threads maintain their own counters and add to these 355 * in __exit_signal, except for the group leader. 356 */ 357 cputime_t utime, stime, cutime, cstime; 358 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 359 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 360 361 /* 362 * Cumulative ns of scheduled CPU time for dead threads in the 363 * group, not including a zombie group leader. (This only differs 364 * from jiffies_to_ns(utime + stime) if sched_clock uses something 365 * other than jiffies.) 366 */ 367 unsigned long long sched_time; 368 369 /* 370 * We don't bother to synchronize most readers of this at all, 371 * because there is no reader checking a limit that actually needs 372 * to get both rlim_cur and rlim_max atomically, and either one 373 * alone is a single word that can safely be read normally. 374 * getrlimit/setrlimit use task_lock(current->group_leader) to 375 * protect this instead of the siglock, because they really 376 * have no need to disable irqs. 377 */ 378 struct rlimit rlim[RLIM_NLIMITS]; 379 380 struct list_head cpu_timers[3]; 381 382 /* keep the process-shared keyrings here so that they do the right 383 * thing in threads created with CLONE_THREAD */ 384 #ifdef CONFIG_KEYS 385 struct key *session_keyring; /* keyring inherited over fork */ 386 struct key *process_keyring; /* keyring private to this process */ 387 #endif 388 }; 389 390 /* Context switch must be unlocked if interrupts are to be enabled */ 391 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 392 # define __ARCH_WANT_UNLOCKED_CTXSW 393 #endif 394 395 /* 396 * Bits in flags field of signal_struct. 397 */ 398 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 399 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 400 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 401 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 402 403 404 /* 405 * Priority of a process goes from 0..MAX_PRIO-1, valid RT 406 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are 407 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values 408 * are inverted: lower p->prio value means higher priority. 409 * 410 * The MAX_USER_RT_PRIO value allows the actual maximum 411 * RT priority to be separate from the value exported to 412 * user-space. This allows kernel threads to set their 413 * priority to a value higher than any user task. Note: 414 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 415 */ 416 417 #define MAX_USER_RT_PRIO 100 418 #define MAX_RT_PRIO MAX_USER_RT_PRIO 419 420 #define MAX_PRIO (MAX_RT_PRIO + 40) 421 422 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO)) 423 424 /* 425 * Some day this will be a full-fledged user tracking system.. 426 */ 427 struct user_struct { 428 atomic_t __count; /* reference count */ 429 atomic_t processes; /* How many processes does this user have? */ 430 atomic_t files; /* How many open files does this user have? */ 431 atomic_t sigpending; /* How many pending signals does this user have? */ 432 #ifdef CONFIG_INOTIFY 433 atomic_t inotify_watches; /* How many inotify watches does this user have? */ 434 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 435 #endif 436 /* protected by mq_lock */ 437 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 438 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 439 440 #ifdef CONFIG_KEYS 441 struct key *uid_keyring; /* UID specific keyring */ 442 struct key *session_keyring; /* UID's default session keyring */ 443 #endif 444 445 /* Hash table maintenance information */ 446 struct list_head uidhash_list; 447 uid_t uid; 448 }; 449 450 extern struct user_struct *find_user(uid_t); 451 452 extern struct user_struct root_user; 453 #define INIT_USER (&root_user) 454 455 typedef struct prio_array prio_array_t; 456 struct backing_dev_info; 457 struct reclaim_state; 458 459 #ifdef CONFIG_SCHEDSTATS 460 struct sched_info { 461 /* cumulative counters */ 462 unsigned long cpu_time, /* time spent on the cpu */ 463 run_delay, /* time spent waiting on a runqueue */ 464 pcnt; /* # of timeslices run on this cpu */ 465 466 /* timestamps */ 467 unsigned long last_arrival, /* when we last ran on a cpu */ 468 last_queued; /* when we were last queued to run */ 469 }; 470 471 extern struct file_operations proc_schedstat_operations; 472 #endif 473 474 enum idle_type 475 { 476 SCHED_IDLE, 477 NOT_IDLE, 478 NEWLY_IDLE, 479 MAX_IDLE_TYPES 480 }; 481 482 /* 483 * sched-domains (multiprocessor balancing) declarations: 484 */ 485 #ifdef CONFIG_SMP 486 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */ 487 488 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 489 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 490 #define SD_BALANCE_EXEC 4 /* Balance on exec */ 491 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 492 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 493 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 494 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 495 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 496 497 struct sched_group { 498 struct sched_group *next; /* Must be a circular list */ 499 cpumask_t cpumask; 500 501 /* 502 * CPU power of this group, SCHED_LOAD_SCALE being max power for a 503 * single CPU. This is read only (except for setup, hotplug CPU). 504 */ 505 unsigned long cpu_power; 506 }; 507 508 struct sched_domain { 509 /* These fields must be setup */ 510 struct sched_domain *parent; /* top domain must be null terminated */ 511 struct sched_group *groups; /* the balancing groups of the domain */ 512 cpumask_t span; /* span of all CPUs in this domain */ 513 unsigned long min_interval; /* Minimum balance interval ms */ 514 unsigned long max_interval; /* Maximum balance interval ms */ 515 unsigned int busy_factor; /* less balancing by factor if busy */ 516 unsigned int imbalance_pct; /* No balance until over watermark */ 517 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */ 518 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 519 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */ 520 unsigned int busy_idx; 521 unsigned int idle_idx; 522 unsigned int newidle_idx; 523 unsigned int wake_idx; 524 unsigned int forkexec_idx; 525 int flags; /* See SD_* */ 526 527 /* Runtime fields. */ 528 unsigned long last_balance; /* init to jiffies. units in jiffies */ 529 unsigned int balance_interval; /* initialise to 1. units in ms. */ 530 unsigned int nr_balance_failed; /* initialise to 0 */ 531 532 #ifdef CONFIG_SCHEDSTATS 533 /* load_balance() stats */ 534 unsigned long lb_cnt[MAX_IDLE_TYPES]; 535 unsigned long lb_failed[MAX_IDLE_TYPES]; 536 unsigned long lb_balanced[MAX_IDLE_TYPES]; 537 unsigned long lb_imbalance[MAX_IDLE_TYPES]; 538 unsigned long lb_gained[MAX_IDLE_TYPES]; 539 unsigned long lb_hot_gained[MAX_IDLE_TYPES]; 540 unsigned long lb_nobusyg[MAX_IDLE_TYPES]; 541 unsigned long lb_nobusyq[MAX_IDLE_TYPES]; 542 543 /* Active load balancing */ 544 unsigned long alb_cnt; 545 unsigned long alb_failed; 546 unsigned long alb_pushed; 547 548 /* SD_BALANCE_EXEC stats */ 549 unsigned long sbe_cnt; 550 unsigned long sbe_balanced; 551 unsigned long sbe_pushed; 552 553 /* SD_BALANCE_FORK stats */ 554 unsigned long sbf_cnt; 555 unsigned long sbf_balanced; 556 unsigned long sbf_pushed; 557 558 /* try_to_wake_up() stats */ 559 unsigned long ttwu_wake_remote; 560 unsigned long ttwu_move_affine; 561 unsigned long ttwu_move_balance; 562 #endif 563 }; 564 565 extern void partition_sched_domains(cpumask_t *partition1, 566 cpumask_t *partition2); 567 #endif /* CONFIG_SMP */ 568 569 570 struct io_context; /* See blkdev.h */ 571 void exit_io_context(void); 572 struct cpuset; 573 574 #define NGROUPS_SMALL 32 575 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) 576 struct group_info { 577 int ngroups; 578 atomic_t usage; 579 gid_t small_block[NGROUPS_SMALL]; 580 int nblocks; 581 gid_t *blocks[0]; 582 }; 583 584 /* 585 * get_group_info() must be called with the owning task locked (via task_lock()) 586 * when task != current. The reason being that the vast majority of callers are 587 * looking at current->group_info, which can not be changed except by the 588 * current task. Changing current->group_info requires the task lock, too. 589 */ 590 #define get_group_info(group_info) do { \ 591 atomic_inc(&(group_info)->usage); \ 592 } while (0) 593 594 #define put_group_info(group_info) do { \ 595 if (atomic_dec_and_test(&(group_info)->usage)) \ 596 groups_free(group_info); \ 597 } while (0) 598 599 extern struct group_info *groups_alloc(int gidsetsize); 600 extern void groups_free(struct group_info *group_info); 601 extern int set_current_groups(struct group_info *group_info); 602 extern int groups_search(struct group_info *group_info, gid_t grp); 603 /* access the groups "array" with this macro */ 604 #define GROUP_AT(gi, i) \ 605 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) 606 607 608 struct audit_context; /* See audit.c */ 609 struct mempolicy; 610 611 struct task_struct { 612 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 613 struct thread_info *thread_info; 614 atomic_t usage; 615 unsigned long flags; /* per process flags, defined below */ 616 unsigned long ptrace; 617 618 int lock_depth; /* BKL lock depth */ 619 620 #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW) 621 int oncpu; 622 #endif 623 int prio, static_prio; 624 struct list_head run_list; 625 prio_array_t *array; 626 627 unsigned short ioprio; 628 629 unsigned long sleep_avg; 630 unsigned long long timestamp, last_ran; 631 unsigned long long sched_time; /* sched_clock time spent running */ 632 int activated; 633 634 unsigned long policy; 635 cpumask_t cpus_allowed; 636 unsigned int time_slice, first_time_slice; 637 638 #ifdef CONFIG_SCHEDSTATS 639 struct sched_info sched_info; 640 #endif 641 642 struct list_head tasks; 643 /* 644 * ptrace_list/ptrace_children forms the list of my children 645 * that were stolen by a ptracer. 646 */ 647 struct list_head ptrace_children; 648 struct list_head ptrace_list; 649 650 struct mm_struct *mm, *active_mm; 651 652 /* task state */ 653 struct linux_binfmt *binfmt; 654 long exit_state; 655 int exit_code, exit_signal; 656 int pdeath_signal; /* The signal sent when the parent dies */ 657 /* ??? */ 658 unsigned long personality; 659 unsigned did_exec:1; 660 pid_t pid; 661 pid_t tgid; 662 /* 663 * pointers to (original) parent process, youngest child, younger sibling, 664 * older sibling, respectively. (p->father can be replaced with 665 * p->parent->pid) 666 */ 667 struct task_struct *real_parent; /* real parent process (when being debugged) */ 668 struct task_struct *parent; /* parent process */ 669 /* 670 * children/sibling forms the list of my children plus the 671 * tasks I'm ptracing. 672 */ 673 struct list_head children; /* list of my children */ 674 struct list_head sibling; /* linkage in my parent's children list */ 675 struct task_struct *group_leader; /* threadgroup leader */ 676 677 /* PID/PID hash table linkage. */ 678 struct pid pids[PIDTYPE_MAX]; 679 680 struct completion *vfork_done; /* for vfork() */ 681 int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 682 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 683 684 unsigned long rt_priority; 685 cputime_t utime, stime; 686 unsigned long nvcsw, nivcsw; /* context switch counts */ 687 struct timespec start_time; 688 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 689 unsigned long min_flt, maj_flt; 690 691 cputime_t it_prof_expires, it_virt_expires; 692 unsigned long long it_sched_expires; 693 struct list_head cpu_timers[3]; 694 695 /* process credentials */ 696 uid_t uid,euid,suid,fsuid; 697 gid_t gid,egid,sgid,fsgid; 698 struct group_info *group_info; 699 kernel_cap_t cap_effective, cap_inheritable, cap_permitted; 700 unsigned keep_capabilities:1; 701 struct user_struct *user; 702 #ifdef CONFIG_KEYS 703 struct key *thread_keyring; /* keyring private to this thread */ 704 unsigned char jit_keyring; /* default keyring to attach requested keys to */ 705 #endif 706 int oomkilladj; /* OOM kill score adjustment (bit shift). */ 707 char comm[TASK_COMM_LEN]; /* executable name excluding path 708 - access with [gs]et_task_comm (which lock 709 it with task_lock()) 710 - initialized normally by flush_old_exec */ 711 /* file system info */ 712 int link_count, total_link_count; 713 /* ipc stuff */ 714 struct sysv_sem sysvsem; 715 /* CPU-specific state of this task */ 716 struct thread_struct thread; 717 /* filesystem information */ 718 struct fs_struct *fs; 719 /* open file information */ 720 struct files_struct *files; 721 /* namespace */ 722 struct namespace *namespace; 723 /* signal handlers */ 724 struct signal_struct *signal; 725 struct sighand_struct *sighand; 726 727 sigset_t blocked, real_blocked; 728 struct sigpending pending; 729 730 unsigned long sas_ss_sp; 731 size_t sas_ss_size; 732 int (*notifier)(void *priv); 733 void *notifier_data; 734 sigset_t *notifier_mask; 735 736 void *security; 737 struct audit_context *audit_context; 738 seccomp_t seccomp; 739 740 /* Thread group tracking */ 741 u32 parent_exec_id; 742 u32 self_exec_id; 743 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 744 spinlock_t alloc_lock; 745 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */ 746 spinlock_t proc_lock; 747 748 /* journalling filesystem info */ 749 void *journal_info; 750 751 /* VM state */ 752 struct reclaim_state *reclaim_state; 753 754 struct dentry *proc_dentry; 755 struct backing_dev_info *backing_dev_info; 756 757 struct io_context *io_context; 758 759 unsigned long ptrace_message; 760 siginfo_t *last_siginfo; /* For ptrace use. */ 761 /* 762 * current io wait handle: wait queue entry to use for io waits 763 * If this thread is processing aio, this points at the waitqueue 764 * inside the currently handled kiocb. It may be NULL (i.e. default 765 * to a stack based synchronous wait) if its doing sync IO. 766 */ 767 wait_queue_t *io_wait; 768 /* i/o counters(bytes read/written, #syscalls */ 769 u64 rchar, wchar, syscr, syscw; 770 #if defined(CONFIG_BSD_PROCESS_ACCT) 771 u64 acct_rss_mem1; /* accumulated rss usage */ 772 u64 acct_vm_mem1; /* accumulated virtual memory usage */ 773 clock_t acct_stimexpd; /* clock_t-converted stime since last update */ 774 #endif 775 #ifdef CONFIG_NUMA 776 struct mempolicy *mempolicy; 777 short il_next; 778 #endif 779 #ifdef CONFIG_CPUSETS 780 struct cpuset *cpuset; 781 nodemask_t mems_allowed; 782 int cpuset_mems_generation; 783 #endif 784 atomic_t fs_excl; /* holding fs exclusive resources */ 785 }; 786 787 static inline pid_t process_group(struct task_struct *tsk) 788 { 789 return tsk->signal->pgrp; 790 } 791 792 /** 793 * pid_alive - check that a task structure is not stale 794 * @p: Task structure to be checked. 795 * 796 * Test if a process is not yet dead (at most zombie state) 797 * If pid_alive fails, then pointers within the task structure 798 * can be stale and must not be dereferenced. 799 */ 800 static inline int pid_alive(struct task_struct *p) 801 { 802 return p->pids[PIDTYPE_PID].nr != 0; 803 } 804 805 extern void free_task(struct task_struct *tsk); 806 extern void __put_task_struct(struct task_struct *tsk); 807 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 808 #define put_task_struct(tsk) \ 809 do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0) 810 811 /* 812 * Per process flags 813 */ 814 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 815 /* Not implemented yet, only for 486*/ 816 #define PF_STARTING 0x00000002 /* being created */ 817 #define PF_EXITING 0x00000004 /* getting shut down */ 818 #define PF_DEAD 0x00000008 /* Dead */ 819 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 820 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 821 #define PF_DUMPCORE 0x00000200 /* dumped core */ 822 #define PF_SIGNALED 0x00000400 /* killed by a signal */ 823 #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 824 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 825 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 826 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */ 827 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 828 #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 829 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 830 #define PF_KSWAPD 0x00040000 /* I am kswapd */ 831 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 832 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 833 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */ 834 #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */ 835 #define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */ 836 837 /* 838 * Only the _current_ task can read/write to tsk->flags, but other 839 * tasks can access tsk->flags in readonly mode for example 840 * with tsk_used_math (like during threaded core dumping). 841 * There is however an exception to this rule during ptrace 842 * or during fork: the ptracer task is allowed to write to the 843 * child->flags of its traced child (same goes for fork, the parent 844 * can write to the child->flags), because we're guaranteed the 845 * child is not running and in turn not changing child->flags 846 * at the same time the parent does it. 847 */ 848 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 849 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 850 #define clear_used_math() clear_stopped_child_used_math(current) 851 #define set_used_math() set_stopped_child_used_math(current) 852 #define conditional_stopped_child_used_math(condition, child) \ 853 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 854 #define conditional_used_math(condition) \ 855 conditional_stopped_child_used_math(condition, current) 856 #define copy_to_stopped_child_used_math(child) \ 857 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 858 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 859 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 860 #define used_math() tsk_used_math(current) 861 862 #ifdef CONFIG_SMP 863 extern int set_cpus_allowed(task_t *p, cpumask_t new_mask); 864 #else 865 static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask) 866 { 867 if (!cpus_intersects(new_mask, cpu_online_map)) 868 return -EINVAL; 869 return 0; 870 } 871 #endif 872 873 extern unsigned long long sched_clock(void); 874 extern unsigned long long current_sched_time(const task_t *current_task); 875 876 /* sched_exec is called by processes performing an exec */ 877 #ifdef CONFIG_SMP 878 extern void sched_exec(void); 879 #else 880 #define sched_exec() {} 881 #endif 882 883 #ifdef CONFIG_HOTPLUG_CPU 884 extern void idle_task_exit(void); 885 #else 886 static inline void idle_task_exit(void) {} 887 #endif 888 889 extern void sched_idle_next(void); 890 extern void set_user_nice(task_t *p, long nice); 891 extern int task_prio(const task_t *p); 892 extern int task_nice(const task_t *p); 893 extern int can_nice(const task_t *p, const int nice); 894 extern int task_curr(const task_t *p); 895 extern int idle_cpu(int cpu); 896 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 897 extern task_t *idle_task(int cpu); 898 899 void yield(void); 900 901 /* 902 * The default (Linux) execution domain. 903 */ 904 extern struct exec_domain default_exec_domain; 905 906 union thread_union { 907 struct thread_info thread_info; 908 unsigned long stack[THREAD_SIZE/sizeof(long)]; 909 }; 910 911 #ifndef __HAVE_ARCH_KSTACK_END 912 static inline int kstack_end(void *addr) 913 { 914 /* Reliable end of stack detection: 915 * Some APM bios versions misalign the stack 916 */ 917 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 918 } 919 #endif 920 921 extern union thread_union init_thread_union; 922 extern struct task_struct init_task; 923 924 extern struct mm_struct init_mm; 925 926 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr) 927 extern struct task_struct *find_task_by_pid_type(int type, int pid); 928 extern void set_special_pids(pid_t session, pid_t pgrp); 929 extern void __set_special_pids(pid_t session, pid_t pgrp); 930 931 /* per-UID process charging. */ 932 extern struct user_struct * alloc_uid(uid_t); 933 static inline struct user_struct *get_uid(struct user_struct *u) 934 { 935 atomic_inc(&u->__count); 936 return u; 937 } 938 extern void free_uid(struct user_struct *); 939 extern void switch_uid(struct user_struct *); 940 941 #include <asm/current.h> 942 943 extern void do_timer(struct pt_regs *); 944 945 extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); 946 extern int FASTCALL(wake_up_process(struct task_struct * tsk)); 947 extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, 948 unsigned long clone_flags)); 949 #ifdef CONFIG_SMP 950 extern void kick_process(struct task_struct *tsk); 951 #else 952 static inline void kick_process(struct task_struct *tsk) { } 953 #endif 954 extern void FASTCALL(sched_fork(task_t * p, int clone_flags)); 955 extern void FASTCALL(sched_exit(task_t * p)); 956 957 extern int in_group_p(gid_t); 958 extern int in_egroup_p(gid_t); 959 960 extern void proc_caches_init(void); 961 extern void flush_signals(struct task_struct *); 962 extern void flush_signal_handlers(struct task_struct *, int force_default); 963 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 964 965 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 966 { 967 unsigned long flags; 968 int ret; 969 970 spin_lock_irqsave(&tsk->sighand->siglock, flags); 971 ret = dequeue_signal(tsk, mask, info); 972 spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 973 974 return ret; 975 } 976 977 extern void block_all_signals(int (*notifier)(void *priv), void *priv, 978 sigset_t *mask); 979 extern void unblock_all_signals(void); 980 extern void release_task(struct task_struct * p); 981 extern int send_sig_info(int, struct siginfo *, struct task_struct *); 982 extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); 983 extern int force_sigsegv(int, struct task_struct *); 984 extern int force_sig_info(int, struct siginfo *, struct task_struct *); 985 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp); 986 extern int kill_pg_info(int, struct siginfo *, pid_t); 987 extern int kill_proc_info(int, struct siginfo *, pid_t); 988 extern void do_notify_parent(struct task_struct *, int); 989 extern void force_sig(int, struct task_struct *); 990 extern void force_sig_specific(int, struct task_struct *); 991 extern int send_sig(int, struct task_struct *, int); 992 extern void zap_other_threads(struct task_struct *p); 993 extern int kill_pg(pid_t, int, int); 994 extern int kill_sl(pid_t, int, int); 995 extern int kill_proc(pid_t, int, int); 996 extern struct sigqueue *sigqueue_alloc(void); 997 extern void sigqueue_free(struct sigqueue *); 998 extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); 999 extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); 1000 extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *); 1001 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 1002 1003 /* These can be the second arg to send_sig_info/send_group_sig_info. */ 1004 #define SEND_SIG_NOINFO ((struct siginfo *) 0) 1005 #define SEND_SIG_PRIV ((struct siginfo *) 1) 1006 #define SEND_SIG_FORCED ((struct siginfo *) 2) 1007 1008 /* True if we are on the alternate signal stack. */ 1009 1010 static inline int on_sig_stack(unsigned long sp) 1011 { 1012 return (sp - current->sas_ss_sp < current->sas_ss_size); 1013 } 1014 1015 static inline int sas_ss_flags(unsigned long sp) 1016 { 1017 return (current->sas_ss_size == 0 ? SS_DISABLE 1018 : on_sig_stack(sp) ? SS_ONSTACK : 0); 1019 } 1020 1021 1022 #ifdef CONFIG_SECURITY 1023 /* code is in security.c */ 1024 extern int capable(int cap); 1025 #else 1026 static inline int capable(int cap) 1027 { 1028 if (cap_raised(current->cap_effective, cap)) { 1029 current->flags |= PF_SUPERPRIV; 1030 return 1; 1031 } 1032 return 0; 1033 } 1034 #endif 1035 1036 /* 1037 * Routines for handling mm_structs 1038 */ 1039 extern struct mm_struct * mm_alloc(void); 1040 1041 /* mmdrop drops the mm and the page tables */ 1042 extern void FASTCALL(__mmdrop(struct mm_struct *)); 1043 static inline void mmdrop(struct mm_struct * mm) 1044 { 1045 if (atomic_dec_and_test(&mm->mm_count)) 1046 __mmdrop(mm); 1047 } 1048 1049 /* mmput gets rid of the mappings and all user-space */ 1050 extern void mmput(struct mm_struct *); 1051 /* Grab a reference to a task's mm, if it is not already going away */ 1052 extern struct mm_struct *get_task_mm(struct task_struct *task); 1053 /* Remove the current tasks stale references to the old mm_struct */ 1054 extern void mm_release(struct task_struct *, struct mm_struct *); 1055 1056 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 1057 extern void flush_thread(void); 1058 extern void exit_thread(void); 1059 1060 extern void exit_files(struct task_struct *); 1061 extern void exit_signal(struct task_struct *); 1062 extern void __exit_signal(struct task_struct *); 1063 extern void exit_sighand(struct task_struct *); 1064 extern void __exit_sighand(struct task_struct *); 1065 extern void exit_itimers(struct signal_struct *); 1066 1067 extern NORET_TYPE void do_group_exit(int); 1068 1069 extern void daemonize(const char *, ...); 1070 extern int allow_signal(int); 1071 extern int disallow_signal(int); 1072 extern task_t *child_reaper; 1073 1074 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 1075 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 1076 task_t *fork_idle(int); 1077 1078 extern void set_task_comm(struct task_struct *tsk, char *from); 1079 extern void get_task_comm(char *to, struct task_struct *tsk); 1080 1081 #ifdef CONFIG_SMP 1082 extern void wait_task_inactive(task_t * p); 1083 #else 1084 #define wait_task_inactive(p) do { } while (0) 1085 #endif 1086 1087 #define remove_parent(p) list_del_init(&(p)->sibling) 1088 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children) 1089 1090 #define REMOVE_LINKS(p) do { \ 1091 if (thread_group_leader(p)) \ 1092 list_del_init(&(p)->tasks); \ 1093 remove_parent(p); \ 1094 } while (0) 1095 1096 #define SET_LINKS(p) do { \ 1097 if (thread_group_leader(p)) \ 1098 list_add_tail(&(p)->tasks,&init_task.tasks); \ 1099 add_parent(p, (p)->parent); \ 1100 } while (0) 1101 1102 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks) 1103 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks) 1104 1105 #define for_each_process(p) \ 1106 for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 1107 1108 /* 1109 * Careful: do_each_thread/while_each_thread is a double loop so 1110 * 'break' will not work as expected - use goto instead. 1111 */ 1112 #define do_each_thread(g, t) \ 1113 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 1114 1115 #define while_each_thread(g, t) \ 1116 while ((t = next_thread(t)) != g) 1117 1118 extern task_t * FASTCALL(next_thread(const task_t *p)); 1119 1120 #define thread_group_leader(p) (p->pid == p->tgid) 1121 1122 static inline int thread_group_empty(task_t *p) 1123 { 1124 return list_empty(&p->pids[PIDTYPE_TGID].pid_list); 1125 } 1126 1127 #define delay_group_leader(p) \ 1128 (thread_group_leader(p) && !thread_group_empty(p)) 1129 1130 extern void unhash_process(struct task_struct *p); 1131 1132 /* 1133 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring 1134 * subscriptions and synchronises with wait4(). Also used in procfs. Also 1135 * pins the final release of task.io_context. 1136 * 1137 * Nests both inside and outside of read_lock(&tasklist_lock). 1138 * It must not be nested with write_lock_irq(&tasklist_lock), 1139 * neither inside nor outside. 1140 */ 1141 static inline void task_lock(struct task_struct *p) 1142 { 1143 spin_lock(&p->alloc_lock); 1144 } 1145 1146 static inline void task_unlock(struct task_struct *p) 1147 { 1148 spin_unlock(&p->alloc_lock); 1149 } 1150 1151 /* set thread flags in other task's structures 1152 * - see asm/thread_info.h for TIF_xxxx flags available 1153 */ 1154 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1155 { 1156 set_ti_thread_flag(tsk->thread_info,flag); 1157 } 1158 1159 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1160 { 1161 clear_ti_thread_flag(tsk->thread_info,flag); 1162 } 1163 1164 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1165 { 1166 return test_and_set_ti_thread_flag(tsk->thread_info,flag); 1167 } 1168 1169 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1170 { 1171 return test_and_clear_ti_thread_flag(tsk->thread_info,flag); 1172 } 1173 1174 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1175 { 1176 return test_ti_thread_flag(tsk->thread_info,flag); 1177 } 1178 1179 static inline void set_tsk_need_resched(struct task_struct *tsk) 1180 { 1181 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1182 } 1183 1184 static inline void clear_tsk_need_resched(struct task_struct *tsk) 1185 { 1186 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1187 } 1188 1189 static inline int signal_pending(struct task_struct *p) 1190 { 1191 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 1192 } 1193 1194 static inline int need_resched(void) 1195 { 1196 return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 1197 } 1198 1199 /* 1200 * cond_resched() and cond_resched_lock(): latency reduction via 1201 * explicit rescheduling in places that are safe. The return 1202 * value indicates whether a reschedule was done in fact. 1203 * cond_resched_lock() will drop the spinlock before scheduling, 1204 * cond_resched_softirq() will enable bhs before scheduling. 1205 */ 1206 extern int cond_resched(void); 1207 extern int cond_resched_lock(spinlock_t * lock); 1208 extern int cond_resched_softirq(void); 1209 1210 /* 1211 * Does a critical section need to be broken due to another 1212 * task waiting?: 1213 */ 1214 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) 1215 # define need_lockbreak(lock) ((lock)->break_lock) 1216 #else 1217 # define need_lockbreak(lock) 0 1218 #endif 1219 1220 /* 1221 * Does a critical section need to be broken due to another 1222 * task waiting or preemption being signalled: 1223 */ 1224 static inline int lock_need_resched(spinlock_t *lock) 1225 { 1226 if (need_lockbreak(lock) || need_resched()) 1227 return 1; 1228 return 0; 1229 } 1230 1231 /* Reevaluate whether the task has signals pending delivery. 1232 This is required every time the blocked sigset_t changes. 1233 callers must hold sighand->siglock. */ 1234 1235 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t)); 1236 extern void recalc_sigpending(void); 1237 1238 extern void signal_wake_up(struct task_struct *t, int resume_stopped); 1239 1240 /* 1241 * Wrappers for p->thread_info->cpu access. No-op on UP. 1242 */ 1243 #ifdef CONFIG_SMP 1244 1245 static inline unsigned int task_cpu(const struct task_struct *p) 1246 { 1247 return p->thread_info->cpu; 1248 } 1249 1250 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1251 { 1252 p->thread_info->cpu = cpu; 1253 } 1254 1255 #else 1256 1257 static inline unsigned int task_cpu(const struct task_struct *p) 1258 { 1259 return 0; 1260 } 1261 1262 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1263 { 1264 } 1265 1266 #endif /* CONFIG_SMP */ 1267 1268 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1269 extern void arch_pick_mmap_layout(struct mm_struct *mm); 1270 #else 1271 static inline void arch_pick_mmap_layout(struct mm_struct *mm) 1272 { 1273 mm->mmap_base = TASK_UNMAPPED_BASE; 1274 mm->get_unmapped_area = arch_get_unmapped_area; 1275 mm->unmap_area = arch_unmap_area; 1276 } 1277 #endif 1278 1279 extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); 1280 extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 1281 1282 #ifdef CONFIG_MAGIC_SYSRQ 1283 1284 extern void normalize_rt_tasks(void); 1285 1286 #endif 1287 1288 #ifdef CONFIG_PM 1289 /* 1290 * Check if a process has been frozen 1291 */ 1292 static inline int frozen(struct task_struct *p) 1293 { 1294 return p->flags & PF_FROZEN; 1295 } 1296 1297 /* 1298 * Check if there is a request to freeze a process 1299 */ 1300 static inline int freezing(struct task_struct *p) 1301 { 1302 return p->flags & PF_FREEZE; 1303 } 1304 1305 /* 1306 * Request that a process be frozen 1307 * FIXME: SMP problem. We may not modify other process' flags! 1308 */ 1309 static inline void freeze(struct task_struct *p) 1310 { 1311 p->flags |= PF_FREEZE; 1312 } 1313 1314 /* 1315 * Wake up a frozen process 1316 */ 1317 static inline int thaw_process(struct task_struct *p) 1318 { 1319 if (frozen(p)) { 1320 p->flags &= ~PF_FROZEN; 1321 wake_up_process(p); 1322 return 1; 1323 } 1324 return 0; 1325 } 1326 1327 /* 1328 * freezing is complete, mark process as frozen 1329 */ 1330 static inline void frozen_process(struct task_struct *p) 1331 { 1332 p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN; 1333 } 1334 1335 extern void refrigerator(void); 1336 extern int freeze_processes(void); 1337 extern void thaw_processes(void); 1338 1339 static inline int try_to_freeze(void) 1340 { 1341 if (freezing(current)) { 1342 refrigerator(); 1343 return 1; 1344 } else 1345 return 0; 1346 } 1347 #else 1348 static inline int frozen(struct task_struct *p) { return 0; } 1349 static inline int freezing(struct task_struct *p) { return 0; } 1350 static inline void freeze(struct task_struct *p) { BUG(); } 1351 static inline int thaw_process(struct task_struct *p) { return 1; } 1352 static inline void frozen_process(struct task_struct *p) { BUG(); } 1353 1354 static inline void refrigerator(void) {} 1355 static inline int freeze_processes(void) { BUG(); return 0; } 1356 static inline void thaw_processes(void) {} 1357 1358 static inline int try_to_freeze(void) { return 0; } 1359 1360 #endif /* CONFIG_PM */ 1361 #endif /* __KERNEL__ */ 1362 1363 #endif 1364