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1da177e4 LT |
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 | struct exec_domain; | |
39 | ||
40 | /* | |
41 | * cloning flags: | |
42 | */ | |
43 | #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ | |
44 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ | |
45 | #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ | |
46 | #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ | |
47 | #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ | |
48 | #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ | |
49 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ | |
50 | #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ | |
51 | #define CLONE_THREAD 0x00010000 /* Same thread group? */ | |
52 | #define CLONE_NEWNS 0x00020000 /* New namespace group? */ | |
53 | #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ | |
54 | #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ | |
55 | #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ | |
56 | #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ | |
57 | #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ | |
58 | #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ | |
59 | #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ | |
60 | #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ | |
61 | ||
62 | /* | |
63 | * List of flags we want to share for kernel threads, | |
64 | * if only because they are not used by them anyway. | |
65 | */ | |
66 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
67 | ||
68 | /* | |
69 | * These are the constant used to fake the fixed-point load-average | |
70 | * counting. Some notes: | |
71 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
72 | * a load-average precision of 10 bits integer + 11 bits fractional | |
73 | * - if you want to count load-averages more often, you need more | |
74 | * precision, or rounding will get you. With 2-second counting freq, | |
75 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
76 | * 11 bit fractions. | |
77 | */ | |
78 | extern unsigned long avenrun[]; /* Load averages */ | |
79 | ||
80 | #define FSHIFT 11 /* nr of bits of precision */ | |
81 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
82 | #define LOAD_FREQ (5*HZ) /* 5 sec intervals */ | |
83 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ | |
84 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
85 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
86 | ||
87 | #define CALC_LOAD(load,exp,n) \ | |
88 | load *= exp; \ | |
89 | load += n*(FIXED_1-exp); \ | |
90 | load >>= FSHIFT; | |
91 | ||
92 | extern unsigned long total_forks; | |
93 | extern int nr_threads; | |
94 | extern int last_pid; | |
95 | DECLARE_PER_CPU(unsigned long, process_counts); | |
96 | extern int nr_processes(void); | |
97 | extern unsigned long nr_running(void); | |
98 | extern unsigned long nr_uninterruptible(void); | |
99 | extern unsigned long nr_iowait(void); | |
100 | ||
101 | #include <linux/time.h> | |
102 | #include <linux/param.h> | |
103 | #include <linux/resource.h> | |
104 | #include <linux/timer.h> | |
105 | ||
106 | #include <asm/processor.h> | |
107 | ||
108 | #define TASK_RUNNING 0 | |
109 | #define TASK_INTERRUPTIBLE 1 | |
110 | #define TASK_UNINTERRUPTIBLE 2 | |
111 | #define TASK_STOPPED 4 | |
112 | #define TASK_TRACED 8 | |
113 | #define EXIT_ZOMBIE 16 | |
114 | #define EXIT_DEAD 32 | |
115 | ||
116 | #define __set_task_state(tsk, state_value) \ | |
117 | do { (tsk)->state = (state_value); } while (0) | |
118 | #define set_task_state(tsk, state_value) \ | |
119 | set_mb((tsk)->state, (state_value)) | |
120 | ||
121 | #define __set_current_state(state_value) \ | |
122 | do { current->state = (state_value); } while (0) | |
123 | #define set_current_state(state_value) \ | |
124 | set_mb(current->state, (state_value)) | |
125 | ||
126 | /* Task command name length */ | |
127 | #define TASK_COMM_LEN 16 | |
128 | ||
129 | /* | |
130 | * Scheduling policies | |
131 | */ | |
132 | #define SCHED_NORMAL 0 | |
133 | #define SCHED_FIFO 1 | |
134 | #define SCHED_RR 2 | |
135 | ||
136 | struct sched_param { | |
137 | int sched_priority; | |
138 | }; | |
139 | ||
140 | #ifdef __KERNEL__ | |
141 | ||
142 | #include <linux/spinlock.h> | |
143 | ||
144 | /* | |
145 | * This serializes "schedule()" and also protects | |
146 | * the run-queue from deletions/modifications (but | |
147 | * _adding_ to the beginning of the run-queue has | |
148 | * a separate lock). | |
149 | */ | |
150 | extern rwlock_t tasklist_lock; | |
151 | extern spinlock_t mmlist_lock; | |
152 | ||
153 | typedef struct task_struct task_t; | |
154 | ||
155 | extern void sched_init(void); | |
156 | extern void sched_init_smp(void); | |
157 | extern void init_idle(task_t *idle, int cpu); | |
158 | ||
159 | extern cpumask_t nohz_cpu_mask; | |
160 | ||
161 | extern void show_state(void); | |
162 | extern void show_regs(struct pt_regs *); | |
163 | ||
164 | /* | |
165 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
166 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
167 | * trace (or NULL if the entire call-chain of the task should be shown). | |
168 | */ | |
169 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
170 | ||
171 | void io_schedule(void); | |
172 | long io_schedule_timeout(long timeout); | |
173 | ||
174 | extern void cpu_init (void); | |
175 | extern void trap_init(void); | |
176 | extern void update_process_times(int user); | |
177 | extern void scheduler_tick(void); | |
178 | ||
179 | /* Attach to any functions which should be ignored in wchan output. */ | |
180 | #define __sched __attribute__((__section__(".sched.text"))) | |
181 | /* Is this address in the __sched functions? */ | |
182 | extern int in_sched_functions(unsigned long addr); | |
183 | ||
184 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
185 | extern signed long FASTCALL(schedule_timeout(signed long timeout)); | |
186 | asmlinkage void schedule(void); | |
187 | ||
188 | struct namespace; | |
189 | ||
190 | /* Maximum number of active map areas.. This is a random (large) number */ | |
191 | #define DEFAULT_MAX_MAP_COUNT 65536 | |
192 | ||
193 | extern int sysctl_max_map_count; | |
194 | ||
195 | #include <linux/aio.h> | |
196 | ||
197 | extern unsigned long | |
198 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
199 | unsigned long, unsigned long); | |
200 | extern unsigned long | |
201 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
202 | unsigned long len, unsigned long pgoff, | |
203 | unsigned long flags); | |
1363c3cd WW |
204 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
205 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
1da177e4 LT |
206 | |
207 | #define set_mm_counter(mm, member, value) (mm)->_##member = (value) | |
208 | #define get_mm_counter(mm, member) ((mm)->_##member) | |
209 | #define add_mm_counter(mm, member, value) (mm)->_##member += (value) | |
210 | #define inc_mm_counter(mm, member) (mm)->_##member++ | |
211 | #define dec_mm_counter(mm, member) (mm)->_##member-- | |
212 | typedef unsigned long mm_counter_t; | |
213 | ||
214 | struct mm_struct { | |
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); | |
1363c3cd WW |
221 | void (*unmap_area) (struct mm_struct *mm, unsigned long addr); |
222 | unsigned long mmap_base; /* base of mmap area */ | |
223 | unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ | |
224 | unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ | |
1da177e4 LT |
225 | pgd_t * pgd; |
226 | atomic_t mm_users; /* How many users with user space? */ | |
227 | atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ | |
228 | int map_count; /* number of VMAs */ | |
229 | struct rw_semaphore mmap_sem; | |
230 | spinlock_t page_table_lock; /* Protects page tables and some counters */ | |
231 | ||
232 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung | |
233 | * together off init_mm.mmlist, and are protected | |
234 | * by mmlist_lock | |
235 | */ | |
236 | ||
237 | unsigned long start_code, end_code, start_data, end_data; | |
238 | unsigned long start_brk, brk, start_stack; | |
239 | unsigned long arg_start, arg_end, env_start, env_end; | |
240 | unsigned long total_vm, locked_vm, shared_vm; | |
241 | unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes; | |
242 | ||
243 | /* Special counters protected by the page_table_lock */ | |
244 | mm_counter_t _rss; | |
245 | mm_counter_t _anon_rss; | |
246 | ||
247 | unsigned long saved_auxv[42]; /* for /proc/PID/auxv */ | |
248 | ||
d6e71144 | 249 | unsigned dumpable:2; |
1da177e4 LT |
250 | cpumask_t cpu_vm_mask; |
251 | ||
252 | /* Architecture-specific MM context */ | |
253 | mm_context_t context; | |
254 | ||
255 | /* Token based thrashing protection. */ | |
256 | unsigned long swap_token_time; | |
257 | char recent_pagein; | |
258 | ||
259 | /* coredumping support */ | |
260 | int core_waiters; | |
261 | struct completion *core_startup_done, core_done; | |
262 | ||
263 | /* aio bits */ | |
264 | rwlock_t ioctx_list_lock; | |
265 | struct kioctx *ioctx_list; | |
266 | ||
267 | struct kioctx default_kioctx; | |
268 | ||
269 | unsigned long hiwater_rss; /* High-water RSS usage */ | |
270 | unsigned long hiwater_vm; /* High-water virtual memory usage */ | |
271 | }; | |
272 | ||
273 | struct sighand_struct { | |
274 | atomic_t count; | |
275 | struct k_sigaction action[_NSIG]; | |
276 | spinlock_t siglock; | |
277 | }; | |
278 | ||
279 | /* | |
280 | * NOTE! "signal_struct" does not have it's own | |
281 | * locking, because a shared signal_struct always | |
282 | * implies a shared sighand_struct, so locking | |
283 | * sighand_struct is always a proper superset of | |
284 | * the locking of signal_struct. | |
285 | */ | |
286 | struct signal_struct { | |
287 | atomic_t count; | |
288 | atomic_t live; | |
289 | ||
290 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
291 | ||
292 | /* current thread group signal load-balancing target: */ | |
293 | task_t *curr_target; | |
294 | ||
295 | /* shared signal handling: */ | |
296 | struct sigpending shared_pending; | |
297 | ||
298 | /* thread group exit support */ | |
299 | int group_exit_code; | |
300 | /* overloaded: | |
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. | |
304 | */ | |
305 | struct task_struct *group_exit_task; | |
306 | int notify_count; | |
307 | ||
308 | /* thread group stop support, overloads group_exit_code too */ | |
309 | int group_stop_count; | |
310 | unsigned int flags; /* see SIGNAL_* flags below */ | |
311 | ||
312 | /* POSIX.1b Interval Timers */ | |
313 | struct list_head posix_timers; | |
314 | ||
315 | /* ITIMER_REAL timer for the process */ | |
316 | struct timer_list real_timer; | |
317 | unsigned long it_real_value, it_real_incr; | |
318 | ||
319 | /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ | |
320 | cputime_t it_prof_expires, it_virt_expires; | |
321 | cputime_t it_prof_incr, it_virt_incr; | |
322 | ||
323 | /* job control IDs */ | |
324 | pid_t pgrp; | |
325 | pid_t tty_old_pgrp; | |
326 | pid_t session; | |
327 | /* boolean value for session group leader */ | |
328 | int leader; | |
329 | ||
330 | struct tty_struct *tty; /* NULL if no tty */ | |
331 | ||
332 | /* | |
333 | * Cumulative resource counters for dead threads in the group, | |
334 | * and for reaped dead child processes forked by this group. | |
335 | * Live threads maintain their own counters and add to these | |
336 | * in __exit_signal, except for the group leader. | |
337 | */ | |
338 | cputime_t utime, stime, cutime, cstime; | |
339 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; | |
340 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
341 | ||
342 | /* | |
343 | * Cumulative ns of scheduled CPU time for dead threads in the | |
344 | * group, not including a zombie group leader. (This only differs | |
345 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
346 | * other than jiffies.) | |
347 | */ | |
348 | unsigned long long sched_time; | |
349 | ||
350 | /* | |
351 | * We don't bother to synchronize most readers of this at all, | |
352 | * because there is no reader checking a limit that actually needs | |
353 | * to get both rlim_cur and rlim_max atomically, and either one | |
354 | * alone is a single word that can safely be read normally. | |
355 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
356 | * protect this instead of the siglock, because they really | |
357 | * have no need to disable irqs. | |
358 | */ | |
359 | struct rlimit rlim[RLIM_NLIMITS]; | |
360 | ||
361 | struct list_head cpu_timers[3]; | |
362 | ||
363 | /* keep the process-shared keyrings here so that they do the right | |
364 | * thing in threads created with CLONE_THREAD */ | |
365 | #ifdef CONFIG_KEYS | |
366 | struct key *session_keyring; /* keyring inherited over fork */ | |
367 | struct key *process_keyring; /* keyring private to this process */ | |
368 | #endif | |
369 | }; | |
370 | ||
4866cde0 NP |
371 | /* Context switch must be unlocked if interrupts are to be enabled */ |
372 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW | |
373 | # define __ARCH_WANT_UNLOCKED_CTXSW | |
374 | #endif | |
375 | ||
1da177e4 LT |
376 | /* |
377 | * Bits in flags field of signal_struct. | |
378 | */ | |
379 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
380 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ | |
381 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ | |
382 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ | |
383 | ||
384 | ||
385 | /* | |
386 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
387 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are | |
388 | * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values | |
389 | * are inverted: lower p->prio value means higher priority. | |
390 | * | |
391 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
392 | * RT priority to be separate from the value exported to | |
393 | * user-space. This allows kernel threads to set their | |
394 | * priority to a value higher than any user task. Note: | |
395 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
396 | */ | |
397 | ||
398 | #define MAX_USER_RT_PRIO 100 | |
399 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
400 | ||
401 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
402 | ||
403 | #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO)) | |
404 | ||
405 | /* | |
406 | * Some day this will be a full-fledged user tracking system.. | |
407 | */ | |
408 | struct user_struct { | |
409 | atomic_t __count; /* reference count */ | |
410 | atomic_t processes; /* How many processes does this user have? */ | |
411 | atomic_t files; /* How many open files does this user have? */ | |
412 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
413 | /* protected by mq_lock */ | |
414 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
415 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ | |
416 | ||
417 | #ifdef CONFIG_KEYS | |
418 | struct key *uid_keyring; /* UID specific keyring */ | |
419 | struct key *session_keyring; /* UID's default session keyring */ | |
420 | #endif | |
421 | ||
422 | /* Hash table maintenance information */ | |
423 | struct list_head uidhash_list; | |
424 | uid_t uid; | |
425 | }; | |
426 | ||
427 | extern struct user_struct *find_user(uid_t); | |
428 | ||
429 | extern struct user_struct root_user; | |
430 | #define INIT_USER (&root_user) | |
431 | ||
432 | typedef struct prio_array prio_array_t; | |
433 | struct backing_dev_info; | |
434 | struct reclaim_state; | |
435 | ||
436 | #ifdef CONFIG_SCHEDSTATS | |
437 | struct sched_info { | |
438 | /* cumulative counters */ | |
439 | unsigned long cpu_time, /* time spent on the cpu */ | |
440 | run_delay, /* time spent waiting on a runqueue */ | |
441 | pcnt; /* # of timeslices run on this cpu */ | |
442 | ||
443 | /* timestamps */ | |
444 | unsigned long last_arrival, /* when we last ran on a cpu */ | |
445 | last_queued; /* when we were last queued to run */ | |
446 | }; | |
447 | ||
448 | extern struct file_operations proc_schedstat_operations; | |
449 | #endif | |
450 | ||
451 | enum idle_type | |
452 | { | |
453 | SCHED_IDLE, | |
454 | NOT_IDLE, | |
455 | NEWLY_IDLE, | |
456 | MAX_IDLE_TYPES | |
457 | }; | |
458 | ||
459 | /* | |
460 | * sched-domains (multiprocessor balancing) declarations: | |
461 | */ | |
462 | #ifdef CONFIG_SMP | |
463 | #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */ | |
464 | ||
465 | #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ | |
466 | #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ | |
467 | #define SD_BALANCE_EXEC 4 /* Balance on exec */ | |
147cbb4b NP |
468 | #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ |
469 | #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ | |
470 | #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ | |
471 | #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ | |
472 | #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ | |
1da177e4 LT |
473 | |
474 | struct sched_group { | |
475 | struct sched_group *next; /* Must be a circular list */ | |
476 | cpumask_t cpumask; | |
477 | ||
478 | /* | |
479 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
480 | * single CPU. This is read only (except for setup, hotplug CPU). | |
481 | */ | |
482 | unsigned long cpu_power; | |
483 | }; | |
484 | ||
485 | struct sched_domain { | |
486 | /* These fields must be setup */ | |
487 | struct sched_domain *parent; /* top domain must be null terminated */ | |
488 | struct sched_group *groups; /* the balancing groups of the domain */ | |
489 | cpumask_t span; /* span of all CPUs in this domain */ | |
490 | unsigned long min_interval; /* Minimum balance interval ms */ | |
491 | unsigned long max_interval; /* Maximum balance interval ms */ | |
492 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
493 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
494 | unsigned long long cache_hot_time; /* Task considered cache hot (ns) */ | |
495 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ | |
496 | unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */ | |
7897986b NP |
497 | unsigned int busy_idx; |
498 | unsigned int idle_idx; | |
499 | unsigned int newidle_idx; | |
500 | unsigned int wake_idx; | |
147cbb4b | 501 | unsigned int forkexec_idx; |
1da177e4 LT |
502 | int flags; /* See SD_* */ |
503 | ||
504 | /* Runtime fields. */ | |
505 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
506 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
507 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
508 | ||
509 | #ifdef CONFIG_SCHEDSTATS | |
510 | /* load_balance() stats */ | |
511 | unsigned long lb_cnt[MAX_IDLE_TYPES]; | |
512 | unsigned long lb_failed[MAX_IDLE_TYPES]; | |
513 | unsigned long lb_balanced[MAX_IDLE_TYPES]; | |
514 | unsigned long lb_imbalance[MAX_IDLE_TYPES]; | |
515 | unsigned long lb_gained[MAX_IDLE_TYPES]; | |
516 | unsigned long lb_hot_gained[MAX_IDLE_TYPES]; | |
517 | unsigned long lb_nobusyg[MAX_IDLE_TYPES]; | |
518 | unsigned long lb_nobusyq[MAX_IDLE_TYPES]; | |
519 | ||
520 | /* Active load balancing */ | |
521 | unsigned long alb_cnt; | |
522 | unsigned long alb_failed; | |
523 | unsigned long alb_pushed; | |
524 | ||
68767a0a NP |
525 | /* SD_BALANCE_EXEC stats */ |
526 | unsigned long sbe_cnt; | |
527 | unsigned long sbe_balanced; | |
1da177e4 LT |
528 | unsigned long sbe_pushed; |
529 | ||
68767a0a NP |
530 | /* SD_BALANCE_FORK stats */ |
531 | unsigned long sbf_cnt; | |
532 | unsigned long sbf_balanced; | |
533 | unsigned long sbf_pushed; | |
534 | ||
1da177e4 LT |
535 | /* try_to_wake_up() stats */ |
536 | unsigned long ttwu_wake_remote; | |
537 | unsigned long ttwu_move_affine; | |
538 | unsigned long ttwu_move_balance; | |
539 | #endif | |
540 | }; | |
541 | ||
1a20ff27 DG |
542 | extern void partition_sched_domains(cpumask_t *partition1, |
543 | cpumask_t *partition2); | |
1da177e4 LT |
544 | #ifdef ARCH_HAS_SCHED_DOMAIN |
545 | /* Useful helpers that arch setup code may use. Defined in kernel/sched.c */ | |
546 | extern cpumask_t cpu_isolated_map; | |
547 | extern void init_sched_build_groups(struct sched_group groups[], | |
548 | cpumask_t span, int (*group_fn)(int cpu)); | |
549 | extern void cpu_attach_domain(struct sched_domain *sd, int cpu); | |
550 | #endif /* ARCH_HAS_SCHED_DOMAIN */ | |
551 | #endif /* CONFIG_SMP */ | |
552 | ||
553 | ||
554 | struct io_context; /* See blkdev.h */ | |
555 | void exit_io_context(void); | |
556 | struct cpuset; | |
557 | ||
558 | #define NGROUPS_SMALL 32 | |
559 | #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) | |
560 | struct group_info { | |
561 | int ngroups; | |
562 | atomic_t usage; | |
563 | gid_t small_block[NGROUPS_SMALL]; | |
564 | int nblocks; | |
565 | gid_t *blocks[0]; | |
566 | }; | |
567 | ||
568 | /* | |
569 | * get_group_info() must be called with the owning task locked (via task_lock()) | |
570 | * when task != current. The reason being that the vast majority of callers are | |
571 | * looking at current->group_info, which can not be changed except by the | |
572 | * current task. Changing current->group_info requires the task lock, too. | |
573 | */ | |
574 | #define get_group_info(group_info) do { \ | |
575 | atomic_inc(&(group_info)->usage); \ | |
576 | } while (0) | |
577 | ||
578 | #define put_group_info(group_info) do { \ | |
579 | if (atomic_dec_and_test(&(group_info)->usage)) \ | |
580 | groups_free(group_info); \ | |
581 | } while (0) | |
582 | ||
3e30148c DH |
583 | extern struct group_info *groups_alloc(int gidsetsize); |
584 | extern void groups_free(struct group_info *group_info); | |
585 | extern int set_current_groups(struct group_info *group_info); | |
586 | extern int groups_search(struct group_info *group_info, gid_t grp); | |
1da177e4 LT |
587 | /* access the groups "array" with this macro */ |
588 | #define GROUP_AT(gi, i) \ | |
589 | ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) | |
590 | ||
591 | ||
592 | struct audit_context; /* See audit.c */ | |
593 | struct mempolicy; | |
594 | ||
595 | struct task_struct { | |
596 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
597 | struct thread_info *thread_info; | |
598 | atomic_t usage; | |
599 | unsigned long flags; /* per process flags, defined below */ | |
600 | unsigned long ptrace; | |
601 | ||
36772092 | 602 | int lock_depth; /* BKL lock depth */ |
1da177e4 | 603 | |
4866cde0 NP |
604 | #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW) |
605 | int oncpu; | |
606 | #endif | |
1da177e4 LT |
607 | int prio, static_prio; |
608 | struct list_head run_list; | |
609 | prio_array_t *array; | |
610 | ||
22e2c507 JA |
611 | unsigned short ioprio; |
612 | ||
1da177e4 LT |
613 | unsigned long sleep_avg; |
614 | unsigned long long timestamp, last_ran; | |
615 | unsigned long long sched_time; /* sched_clock time spent running */ | |
616 | int activated; | |
617 | ||
618 | unsigned long policy; | |
619 | cpumask_t cpus_allowed; | |
620 | unsigned int time_slice, first_time_slice; | |
621 | ||
622 | #ifdef CONFIG_SCHEDSTATS | |
623 | struct sched_info sched_info; | |
624 | #endif | |
625 | ||
626 | struct list_head tasks; | |
627 | /* | |
628 | * ptrace_list/ptrace_children forms the list of my children | |
629 | * that were stolen by a ptracer. | |
630 | */ | |
631 | struct list_head ptrace_children; | |
632 | struct list_head ptrace_list; | |
633 | ||
634 | struct mm_struct *mm, *active_mm; | |
635 | ||
636 | /* task state */ | |
637 | struct linux_binfmt *binfmt; | |
638 | long exit_state; | |
639 | int exit_code, exit_signal; | |
640 | int pdeath_signal; /* The signal sent when the parent dies */ | |
641 | /* ??? */ | |
642 | unsigned long personality; | |
643 | unsigned did_exec:1; | |
644 | pid_t pid; | |
645 | pid_t tgid; | |
646 | /* | |
647 | * pointers to (original) parent process, youngest child, younger sibling, | |
648 | * older sibling, respectively. (p->father can be replaced with | |
649 | * p->parent->pid) | |
650 | */ | |
651 | struct task_struct *real_parent; /* real parent process (when being debugged) */ | |
652 | struct task_struct *parent; /* parent process */ | |
653 | /* | |
654 | * children/sibling forms the list of my children plus the | |
655 | * tasks I'm ptracing. | |
656 | */ | |
657 | struct list_head children; /* list of my children */ | |
658 | struct list_head sibling; /* linkage in my parent's children list */ | |
659 | struct task_struct *group_leader; /* threadgroup leader */ | |
660 | ||
661 | /* PID/PID hash table linkage. */ | |
662 | struct pid pids[PIDTYPE_MAX]; | |
663 | ||
664 | struct completion *vfork_done; /* for vfork() */ | |
665 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
666 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
667 | ||
668 | unsigned long rt_priority; | |
669 | cputime_t utime, stime; | |
670 | unsigned long nvcsw, nivcsw; /* context switch counts */ | |
671 | struct timespec start_time; | |
672 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ | |
673 | unsigned long min_flt, maj_flt; | |
674 | ||
675 | cputime_t it_prof_expires, it_virt_expires; | |
676 | unsigned long long it_sched_expires; | |
677 | struct list_head cpu_timers[3]; | |
678 | ||
679 | /* process credentials */ | |
680 | uid_t uid,euid,suid,fsuid; | |
681 | gid_t gid,egid,sgid,fsgid; | |
682 | struct group_info *group_info; | |
683 | kernel_cap_t cap_effective, cap_inheritable, cap_permitted; | |
684 | unsigned keep_capabilities:1; | |
685 | struct user_struct *user; | |
686 | #ifdef CONFIG_KEYS | |
687 | struct key *thread_keyring; /* keyring private to this thread */ | |
3e30148c | 688 | unsigned char jit_keyring; /* default keyring to attach requested keys to */ |
1da177e4 LT |
689 | #endif |
690 | int oomkilladj; /* OOM kill score adjustment (bit shift). */ | |
36772092 PBG |
691 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
692 | - access with [gs]et_task_comm (which lock | |
693 | it with task_lock()) | |
694 | - initialized normally by flush_old_exec */ | |
1da177e4 LT |
695 | /* file system info */ |
696 | int link_count, total_link_count; | |
697 | /* ipc stuff */ | |
698 | struct sysv_sem sysvsem; | |
699 | /* CPU-specific state of this task */ | |
700 | struct thread_struct thread; | |
701 | /* filesystem information */ | |
702 | struct fs_struct *fs; | |
703 | /* open file information */ | |
704 | struct files_struct *files; | |
705 | /* namespace */ | |
706 | struct namespace *namespace; | |
707 | /* signal handlers */ | |
708 | struct signal_struct *signal; | |
709 | struct sighand_struct *sighand; | |
710 | ||
711 | sigset_t blocked, real_blocked; | |
712 | struct sigpending pending; | |
713 | ||
714 | unsigned long sas_ss_sp; | |
715 | size_t sas_ss_size; | |
716 | int (*notifier)(void *priv); | |
717 | void *notifier_data; | |
718 | sigset_t *notifier_mask; | |
719 | ||
720 | void *security; | |
721 | struct audit_context *audit_context; | |
722 | seccomp_t seccomp; | |
723 | ||
724 | /* Thread group tracking */ | |
725 | u32 parent_exec_id; | |
726 | u32 self_exec_id; | |
727 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ | |
728 | spinlock_t alloc_lock; | |
729 | /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */ | |
730 | spinlock_t proc_lock; | |
1da177e4 LT |
731 | |
732 | /* journalling filesystem info */ | |
733 | void *journal_info; | |
734 | ||
735 | /* VM state */ | |
736 | struct reclaim_state *reclaim_state; | |
737 | ||
738 | struct dentry *proc_dentry; | |
739 | struct backing_dev_info *backing_dev_info; | |
740 | ||
741 | struct io_context *io_context; | |
742 | ||
743 | unsigned long ptrace_message; | |
744 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
745 | /* | |
746 | * current io wait handle: wait queue entry to use for io waits | |
747 | * If this thread is processing aio, this points at the waitqueue | |
748 | * inside the currently handled kiocb. It may be NULL (i.e. default | |
749 | * to a stack based synchronous wait) if its doing sync IO. | |
750 | */ | |
751 | wait_queue_t *io_wait; | |
752 | /* i/o counters(bytes read/written, #syscalls */ | |
753 | u64 rchar, wchar, syscr, syscw; | |
754 | #if defined(CONFIG_BSD_PROCESS_ACCT) | |
755 | u64 acct_rss_mem1; /* accumulated rss usage */ | |
756 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
757 | clock_t acct_stimexpd; /* clock_t-converted stime since last update */ | |
758 | #endif | |
759 | #ifdef CONFIG_NUMA | |
760 | struct mempolicy *mempolicy; | |
761 | short il_next; | |
762 | #endif | |
763 | #ifdef CONFIG_CPUSETS | |
764 | struct cpuset *cpuset; | |
765 | nodemask_t mems_allowed; | |
766 | int cpuset_mems_generation; | |
767 | #endif | |
22e2c507 | 768 | atomic_t fs_excl; /* holding fs exclusive resources */ |
1da177e4 LT |
769 | }; |
770 | ||
771 | static inline pid_t process_group(struct task_struct *tsk) | |
772 | { | |
773 | return tsk->signal->pgrp; | |
774 | } | |
775 | ||
776 | /** | |
777 | * pid_alive - check that a task structure is not stale | |
778 | * @p: Task structure to be checked. | |
779 | * | |
780 | * Test if a process is not yet dead (at most zombie state) | |
781 | * If pid_alive fails, then pointers within the task structure | |
782 | * can be stale and must not be dereferenced. | |
783 | */ | |
784 | static inline int pid_alive(struct task_struct *p) | |
785 | { | |
786 | return p->pids[PIDTYPE_PID].nr != 0; | |
787 | } | |
788 | ||
789 | extern void free_task(struct task_struct *tsk); | |
790 | extern void __put_task_struct(struct task_struct *tsk); | |
791 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) | |
792 | #define put_task_struct(tsk) \ | |
793 | do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0) | |
794 | ||
795 | /* | |
796 | * Per process flags | |
797 | */ | |
798 | #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ | |
799 | /* Not implemented yet, only for 486*/ | |
800 | #define PF_STARTING 0x00000002 /* being created */ | |
801 | #define PF_EXITING 0x00000004 /* getting shut down */ | |
802 | #define PF_DEAD 0x00000008 /* Dead */ | |
803 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ | |
804 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ | |
805 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
806 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
807 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
808 | #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ | |
809 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ | |
810 | #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */ | |
811 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ | |
812 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
813 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
814 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
815 | #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ | |
816 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ | |
817 | #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */ | |
818 | #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */ | |
819 | #define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */ | |
820 | ||
821 | /* | |
822 | * Only the _current_ task can read/write to tsk->flags, but other | |
823 | * tasks can access tsk->flags in readonly mode for example | |
824 | * with tsk_used_math (like during threaded core dumping). | |
825 | * There is however an exception to this rule during ptrace | |
826 | * or during fork: the ptracer task is allowed to write to the | |
827 | * child->flags of its traced child (same goes for fork, the parent | |
828 | * can write to the child->flags), because we're guaranteed the | |
829 | * child is not running and in turn not changing child->flags | |
830 | * at the same time the parent does it. | |
831 | */ | |
832 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
833 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
834 | #define clear_used_math() clear_stopped_child_used_math(current) | |
835 | #define set_used_math() set_stopped_child_used_math(current) | |
836 | #define conditional_stopped_child_used_math(condition, child) \ | |
837 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
838 | #define conditional_used_math(condition) \ | |
839 | conditional_stopped_child_used_math(condition, current) | |
840 | #define copy_to_stopped_child_used_math(child) \ | |
841 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
842 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
843 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
844 | #define used_math() tsk_used_math(current) | |
845 | ||
846 | #ifdef CONFIG_SMP | |
847 | extern int set_cpus_allowed(task_t *p, cpumask_t new_mask); | |
848 | #else | |
849 | static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask) | |
850 | { | |
851 | if (!cpus_intersects(new_mask, cpu_online_map)) | |
852 | return -EINVAL; | |
853 | return 0; | |
854 | } | |
855 | #endif | |
856 | ||
857 | extern unsigned long long sched_clock(void); | |
858 | extern unsigned long long current_sched_time(const task_t *current_task); | |
859 | ||
860 | /* sched_exec is called by processes performing an exec */ | |
861 | #ifdef CONFIG_SMP | |
862 | extern void sched_exec(void); | |
863 | #else | |
864 | #define sched_exec() {} | |
865 | #endif | |
866 | ||
867 | #ifdef CONFIG_HOTPLUG_CPU | |
868 | extern void idle_task_exit(void); | |
869 | #else | |
870 | static inline void idle_task_exit(void) {} | |
871 | #endif | |
872 | ||
873 | extern void sched_idle_next(void); | |
874 | extern void set_user_nice(task_t *p, long nice); | |
875 | extern int task_prio(const task_t *p); | |
876 | extern int task_nice(const task_t *p); | |
e43379f1 | 877 | extern int can_nice(const task_t *p, const int nice); |
1da177e4 LT |
878 | extern int task_curr(const task_t *p); |
879 | extern int idle_cpu(int cpu); | |
880 | extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); | |
881 | extern task_t *idle_task(int cpu); | |
882 | ||
883 | void yield(void); | |
884 | ||
885 | /* | |
886 | * The default (Linux) execution domain. | |
887 | */ | |
888 | extern struct exec_domain default_exec_domain; | |
889 | ||
890 | union thread_union { | |
891 | struct thread_info thread_info; | |
892 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
893 | }; | |
894 | ||
895 | #ifndef __HAVE_ARCH_KSTACK_END | |
896 | static inline int kstack_end(void *addr) | |
897 | { | |
898 | /* Reliable end of stack detection: | |
899 | * Some APM bios versions misalign the stack | |
900 | */ | |
901 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
902 | } | |
903 | #endif | |
904 | ||
905 | extern union thread_union init_thread_union; | |
906 | extern struct task_struct init_task; | |
907 | ||
908 | extern struct mm_struct init_mm; | |
909 | ||
910 | #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr) | |
911 | extern struct task_struct *find_task_by_pid_type(int type, int pid); | |
912 | extern void set_special_pids(pid_t session, pid_t pgrp); | |
913 | extern void __set_special_pids(pid_t session, pid_t pgrp); | |
914 | ||
915 | /* per-UID process charging. */ | |
916 | extern struct user_struct * alloc_uid(uid_t); | |
917 | static inline struct user_struct *get_uid(struct user_struct *u) | |
918 | { | |
919 | atomic_inc(&u->__count); | |
920 | return u; | |
921 | } | |
922 | extern void free_uid(struct user_struct *); | |
923 | extern void switch_uid(struct user_struct *); | |
924 | ||
925 | #include <asm/current.h> | |
926 | ||
927 | extern void do_timer(struct pt_regs *); | |
928 | ||
929 | extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); | |
930 | extern int FASTCALL(wake_up_process(struct task_struct * tsk)); | |
931 | extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, | |
932 | unsigned long clone_flags)); | |
933 | #ifdef CONFIG_SMP | |
934 | extern void kick_process(struct task_struct *tsk); | |
935 | #else | |
936 | static inline void kick_process(struct task_struct *tsk) { } | |
937 | #endif | |
476d139c | 938 | extern void FASTCALL(sched_fork(task_t * p, int clone_flags)); |
1da177e4 LT |
939 | extern void FASTCALL(sched_exit(task_t * p)); |
940 | ||
941 | extern int in_group_p(gid_t); | |
942 | extern int in_egroup_p(gid_t); | |
943 | ||
944 | extern void proc_caches_init(void); | |
945 | extern void flush_signals(struct task_struct *); | |
946 | extern void flush_signal_handlers(struct task_struct *, int force_default); | |
947 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
948 | ||
949 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
950 | { | |
951 | unsigned long flags; | |
952 | int ret; | |
953 | ||
954 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
955 | ret = dequeue_signal(tsk, mask, info); | |
956 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
957 | ||
958 | return ret; | |
959 | } | |
960 | ||
961 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
962 | sigset_t *mask); | |
963 | extern void unblock_all_signals(void); | |
964 | extern void release_task(struct task_struct * p); | |
965 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
966 | extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); | |
967 | extern int force_sigsegv(int, struct task_struct *); | |
968 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
969 | extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp); | |
970 | extern int kill_pg_info(int, struct siginfo *, pid_t); | |
971 | extern int kill_proc_info(int, struct siginfo *, pid_t); | |
972 | extern void do_notify_parent(struct task_struct *, int); | |
973 | extern void force_sig(int, struct task_struct *); | |
974 | extern void force_sig_specific(int, struct task_struct *); | |
975 | extern int send_sig(int, struct task_struct *, int); | |
976 | extern void zap_other_threads(struct task_struct *p); | |
977 | extern int kill_pg(pid_t, int, int); | |
978 | extern int kill_sl(pid_t, int, int); | |
979 | extern int kill_proc(pid_t, int, int); | |
980 | extern struct sigqueue *sigqueue_alloc(void); | |
981 | extern void sigqueue_free(struct sigqueue *); | |
982 | extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); | |
983 | extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); | |
984 | extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *); | |
985 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); | |
986 | ||
987 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ | |
988 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
989 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
990 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
991 | ||
992 | /* True if we are on the alternate signal stack. */ | |
993 | ||
994 | static inline int on_sig_stack(unsigned long sp) | |
995 | { | |
996 | return (sp - current->sas_ss_sp < current->sas_ss_size); | |
997 | } | |
998 | ||
999 | static inline int sas_ss_flags(unsigned long sp) | |
1000 | { | |
1001 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
1002 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
1003 | } | |
1004 | ||
1005 | ||
1006 | #ifdef CONFIG_SECURITY | |
1007 | /* code is in security.c */ | |
1008 | extern int capable(int cap); | |
1009 | #else | |
1010 | static inline int capable(int cap) | |
1011 | { | |
1012 | if (cap_raised(current->cap_effective, cap)) { | |
1013 | current->flags |= PF_SUPERPRIV; | |
1014 | return 1; | |
1015 | } | |
1016 | return 0; | |
1017 | } | |
1018 | #endif | |
1019 | ||
1020 | /* | |
1021 | * Routines for handling mm_structs | |
1022 | */ | |
1023 | extern struct mm_struct * mm_alloc(void); | |
1024 | ||
1025 | /* mmdrop drops the mm and the page tables */ | |
1026 | extern void FASTCALL(__mmdrop(struct mm_struct *)); | |
1027 | static inline void mmdrop(struct mm_struct * mm) | |
1028 | { | |
1029 | if (atomic_dec_and_test(&mm->mm_count)) | |
1030 | __mmdrop(mm); | |
1031 | } | |
1032 | ||
1033 | /* mmput gets rid of the mappings and all user-space */ | |
1034 | extern void mmput(struct mm_struct *); | |
1035 | /* Grab a reference to a task's mm, if it is not already going away */ | |
1036 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
1037 | /* Remove the current tasks stale references to the old mm_struct */ | |
1038 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
1039 | ||
1040 | extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); | |
1041 | extern void flush_thread(void); | |
1042 | extern void exit_thread(void); | |
1043 | ||
1da177e4 LT |
1044 | extern void exit_files(struct task_struct *); |
1045 | extern void exit_signal(struct task_struct *); | |
1046 | extern void __exit_signal(struct task_struct *); | |
1047 | extern void exit_sighand(struct task_struct *); | |
1048 | extern void __exit_sighand(struct task_struct *); | |
1049 | extern void exit_itimers(struct signal_struct *); | |
1050 | ||
1051 | extern NORET_TYPE void do_group_exit(int); | |
1052 | ||
1da177e4 LT |
1053 | extern void daemonize(const char *, ...); |
1054 | extern int allow_signal(int); | |
1055 | extern int disallow_signal(int); | |
1056 | extern task_t *child_reaper; | |
1057 | ||
1058 | extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); | |
1059 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); | |
1060 | task_t *fork_idle(int); | |
1061 | ||
1062 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
1063 | extern void get_task_comm(char *to, struct task_struct *tsk); | |
1064 | ||
1065 | #ifdef CONFIG_SMP | |
1066 | extern void wait_task_inactive(task_t * p); | |
1067 | #else | |
1068 | #define wait_task_inactive(p) do { } while (0) | |
1069 | #endif | |
1070 | ||
1071 | #define remove_parent(p) list_del_init(&(p)->sibling) | |
1072 | #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children) | |
1073 | ||
1074 | #define REMOVE_LINKS(p) do { \ | |
1075 | if (thread_group_leader(p)) \ | |
1076 | list_del_init(&(p)->tasks); \ | |
1077 | remove_parent(p); \ | |
1078 | } while (0) | |
1079 | ||
1080 | #define SET_LINKS(p) do { \ | |
1081 | if (thread_group_leader(p)) \ | |
1082 | list_add_tail(&(p)->tasks,&init_task.tasks); \ | |
1083 | add_parent(p, (p)->parent); \ | |
1084 | } while (0) | |
1085 | ||
1086 | #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks) | |
1087 | #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks) | |
1088 | ||
1089 | #define for_each_process(p) \ | |
1090 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
1091 | ||
1092 | /* | |
1093 | * Careful: do_each_thread/while_each_thread is a double loop so | |
1094 | * 'break' will not work as expected - use goto instead. | |
1095 | */ | |
1096 | #define do_each_thread(g, t) \ | |
1097 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
1098 | ||
1099 | #define while_each_thread(g, t) \ | |
1100 | while ((t = next_thread(t)) != g) | |
1101 | ||
1102 | extern task_t * FASTCALL(next_thread(const task_t *p)); | |
1103 | ||
1104 | #define thread_group_leader(p) (p->pid == p->tgid) | |
1105 | ||
1106 | static inline int thread_group_empty(task_t *p) | |
1107 | { | |
1108 | return list_empty(&p->pids[PIDTYPE_TGID].pid_list); | |
1109 | } | |
1110 | ||
1111 | #define delay_group_leader(p) \ | |
1112 | (thread_group_leader(p) && !thread_group_empty(p)) | |
1113 | ||
1114 | extern void unhash_process(struct task_struct *p); | |
1115 | ||
1116 | /* | |
1117 | * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring | |
22e2c507 JA |
1118 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
1119 | * pins the final release of task.io_context. | |
1da177e4 LT |
1120 | * |
1121 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
1122 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
1123 | * neither inside nor outside. | |
1124 | */ | |
1125 | static inline void task_lock(struct task_struct *p) | |
1126 | { | |
1127 | spin_lock(&p->alloc_lock); | |
1128 | } | |
1129 | ||
1130 | static inline void task_unlock(struct task_struct *p) | |
1131 | { | |
1132 | spin_unlock(&p->alloc_lock); | |
1133 | } | |
1134 | ||
1135 | /* set thread flags in other task's structures | |
1136 | * - see asm/thread_info.h for TIF_xxxx flags available | |
1137 | */ | |
1138 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1139 | { | |
1140 | set_ti_thread_flag(tsk->thread_info,flag); | |
1141 | } | |
1142 | ||
1143 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1144 | { | |
1145 | clear_ti_thread_flag(tsk->thread_info,flag); | |
1146 | } | |
1147 | ||
1148 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1149 | { | |
1150 | return test_and_set_ti_thread_flag(tsk->thread_info,flag); | |
1151 | } | |
1152 | ||
1153 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1154 | { | |
1155 | return test_and_clear_ti_thread_flag(tsk->thread_info,flag); | |
1156 | } | |
1157 | ||
1158 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1159 | { | |
1160 | return test_ti_thread_flag(tsk->thread_info,flag); | |
1161 | } | |
1162 | ||
1163 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1164 | { | |
1165 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1166 | } | |
1167 | ||
1168 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1169 | { | |
1170 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1171 | } | |
1172 | ||
1173 | static inline int signal_pending(struct task_struct *p) | |
1174 | { | |
1175 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
1176 | } | |
1177 | ||
1178 | static inline int need_resched(void) | |
1179 | { | |
1180 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); | |
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1185 | * explicit rescheduling in places that are safe. The return | |
1186 | * value indicates whether a reschedule was done in fact. | |
1187 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1188 | * cond_resched_softirq() will enable bhs before scheduling. | |
1189 | */ | |
1190 | extern int cond_resched(void); | |
1191 | extern int cond_resched_lock(spinlock_t * lock); | |
1192 | extern int cond_resched_softirq(void); | |
1193 | ||
1194 | /* | |
1195 | * Does a critical section need to be broken due to another | |
1196 | * task waiting?: | |
1197 | */ | |
1198 | #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) | |
1199 | # define need_lockbreak(lock) ((lock)->break_lock) | |
1200 | #else | |
1201 | # define need_lockbreak(lock) 0 | |
1202 | #endif | |
1203 | ||
1204 | /* | |
1205 | * Does a critical section need to be broken due to another | |
1206 | * task waiting or preemption being signalled: | |
1207 | */ | |
1208 | static inline int lock_need_resched(spinlock_t *lock) | |
1209 | { | |
1210 | if (need_lockbreak(lock) || need_resched()) | |
1211 | return 1; | |
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | /* Reevaluate whether the task has signals pending delivery. | |
1216 | This is required every time the blocked sigset_t changes. | |
1217 | callers must hold sighand->siglock. */ | |
1218 | ||
1219 | extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t)); | |
1220 | extern void recalc_sigpending(void); | |
1221 | ||
1222 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
1223 | ||
1224 | /* | |
1225 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
1226 | */ | |
1227 | #ifdef CONFIG_SMP | |
1228 | ||
1229 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1230 | { | |
1231 | return p->thread_info->cpu; | |
1232 | } | |
1233 | ||
1234 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1235 | { | |
1236 | p->thread_info->cpu = cpu; | |
1237 | } | |
1238 | ||
1239 | #else | |
1240 | ||
1241 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1242 | { | |
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1247 | { | |
1248 | } | |
1249 | ||
1250 | #endif /* CONFIG_SMP */ | |
1251 | ||
1252 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1253 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1254 | #else | |
1255 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) | |
1256 | { | |
1257 | mm->mmap_base = TASK_UNMAPPED_BASE; | |
1258 | mm->get_unmapped_area = arch_get_unmapped_area; | |
1259 | mm->unmap_area = arch_unmap_area; | |
1260 | } | |
1261 | #endif | |
1262 | ||
1263 | extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); | |
1264 | extern long sched_getaffinity(pid_t pid, cpumask_t *mask); | |
1265 | ||
1266 | #ifdef CONFIG_MAGIC_SYSRQ | |
1267 | ||
1268 | extern void normalize_rt_tasks(void); | |
1269 | ||
1270 | #endif | |
1271 | ||
1da177e4 | 1272 | #ifdef CONFIG_PM |
3e1d1d28 CL |
1273 | /* |
1274 | * Check if a process has been frozen | |
1275 | */ | |
1276 | static inline int frozen(struct task_struct *p) | |
1277 | { | |
1278 | return p->flags & PF_FROZEN; | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * Check if there is a request to freeze a process | |
1283 | */ | |
1284 | static inline int freezing(struct task_struct *p) | |
1285 | { | |
1286 | return p->flags & PF_FREEZE; | |
1287 | } | |
1288 | ||
1289 | /* | |
1290 | * Request that a process be frozen | |
1291 | * FIXME: SMP problem. We may not modify other process' flags! | |
1292 | */ | |
1293 | static inline void freeze(struct task_struct *p) | |
1294 | { | |
1295 | p->flags |= PF_FREEZE; | |
1296 | } | |
1297 | ||
1298 | /* | |
1299 | * Wake up a frozen process | |
1300 | */ | |
1301 | static inline int thaw_process(struct task_struct *p) | |
1302 | { | |
1303 | if (frozen(p)) { | |
1304 | p->flags &= ~PF_FROZEN; | |
1305 | wake_up_process(p); | |
1306 | return 1; | |
1307 | } | |
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | /* | |
1312 | * freezing is complete, mark process as frozen | |
1313 | */ | |
1314 | static inline void frozen_process(struct task_struct *p) | |
1315 | { | |
1316 | p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN; | |
1317 | } | |
1318 | ||
1319 | extern void refrigerator(void); | |
1da177e4 LT |
1320 | extern int freeze_processes(void); |
1321 | extern void thaw_processes(void); | |
1322 | ||
3e1d1d28 | 1323 | static inline int try_to_freeze(void) |
1da177e4 | 1324 | { |
3e1d1d28 CL |
1325 | if (freezing(current)) { |
1326 | refrigerator(); | |
1da177e4 LT |
1327 | return 1; |
1328 | } else | |
1329 | return 0; | |
1330 | } | |
1331 | #else | |
3e1d1d28 CL |
1332 | static inline int frozen(struct task_struct *p) { return 0; } |
1333 | static inline int freezing(struct task_struct *p) { return 0; } | |
1334 | static inline void freeze(struct task_struct *p) { BUG(); } | |
1335 | static inline int thaw_process(struct task_struct *p) { return 1; } | |
1336 | static inline void frozen_process(struct task_struct *p) { BUG(); } | |
1337 | ||
1338 | static inline void refrigerator(void) {} | |
1da177e4 LT |
1339 | static inline int freeze_processes(void) { BUG(); return 0; } |
1340 | static inline void thaw_processes(void) {} | |
1341 | ||
3e1d1d28 CL |
1342 | static inline int try_to_freeze(void) { return 0; } |
1343 | ||
1da177e4 LT |
1344 | #endif /* CONFIG_PM */ |
1345 | #endif /* __KERNEL__ */ | |
1346 | ||
1347 | #endif |