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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
b7b3c76a DW |
4 | #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */ |
5 | ||
6 | /* | |
7 | * cloning flags: | |
8 | */ | |
9 | #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ | |
10 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ | |
11 | #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ | |
12 | #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ | |
13 | #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ | |
14 | #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ | |
15 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ | |
16 | #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ | |
17 | #define CLONE_THREAD 0x00010000 /* Same thread group? */ | |
18 | #define CLONE_NEWNS 0x00020000 /* New namespace group? */ | |
19 | #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ | |
20 | #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ | |
21 | #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ | |
22 | #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ | |
23 | #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ | |
24 | #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ | |
25 | #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ | |
26 | #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ | |
071df104 | 27 | #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ |
b7b3c76a DW |
28 | |
29 | /* | |
30 | * Scheduling policies | |
31 | */ | |
32 | #define SCHED_NORMAL 0 | |
33 | #define SCHED_FIFO 1 | |
34 | #define SCHED_RR 2 | |
35 | #define SCHED_BATCH 3 | |
36 | ||
a3b6714e | 37 | #ifdef __KERNEL__ |
b7b3c76a DW |
38 | |
39 | struct sched_param { | |
40 | int sched_priority; | |
41 | }; | |
42 | ||
1da177e4 LT |
43 | #include <asm/param.h> /* for HZ */ |
44 | ||
1da177e4 LT |
45 | #include <linux/capability.h> |
46 | #include <linux/threads.h> | |
47 | #include <linux/kernel.h> | |
48 | #include <linux/types.h> | |
49 | #include <linux/timex.h> | |
50 | #include <linux/jiffies.h> | |
51 | #include <linux/rbtree.h> | |
52 | #include <linux/thread_info.h> | |
53 | #include <linux/cpumask.h> | |
54 | #include <linux/errno.h> | |
55 | #include <linux/nodemask.h> | |
56 | ||
57 | #include <asm/system.h> | |
58 | #include <asm/semaphore.h> | |
59 | #include <asm/page.h> | |
60 | #include <asm/ptrace.h> | |
61 | #include <asm/mmu.h> | |
62 | #include <asm/cputime.h> | |
63 | ||
64 | #include <linux/smp.h> | |
65 | #include <linux/sem.h> | |
66 | #include <linux/signal.h> | |
67 | #include <linux/securebits.h> | |
68 | #include <linux/fs_struct.h> | |
69 | #include <linux/compiler.h> | |
70 | #include <linux/completion.h> | |
71 | #include <linux/pid.h> | |
72 | #include <linux/percpu.h> | |
73 | #include <linux/topology.h> | |
74 | #include <linux/seccomp.h> | |
e56d0903 | 75 | #include <linux/rcupdate.h> |
0771dfef | 76 | #include <linux/futex.h> |
23f78d4a | 77 | #include <linux/rtmutex.h> |
1da177e4 | 78 | |
a3b6714e DW |
79 | #include <linux/time.h> |
80 | #include <linux/param.h> | |
81 | #include <linux/resource.h> | |
82 | #include <linux/timer.h> | |
83 | #include <linux/hrtimer.h> | |
84 | ||
85 | #include <asm/processor.h> | |
36d57ac4 | 86 | |
1da177e4 | 87 | struct exec_domain; |
c87e2837 | 88 | struct futex_pi_state; |
1da177e4 | 89 | |
1da177e4 LT |
90 | /* |
91 | * List of flags we want to share for kernel threads, | |
92 | * if only because they are not used by them anyway. | |
93 | */ | |
94 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
95 | ||
96 | /* | |
97 | * These are the constant used to fake the fixed-point load-average | |
98 | * counting. Some notes: | |
99 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
100 | * a load-average precision of 10 bits integer + 11 bits fractional | |
101 | * - if you want to count load-averages more often, you need more | |
102 | * precision, or rounding will get you. With 2-second counting freq, | |
103 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
104 | * 11 bit fractions. | |
105 | */ | |
106 | extern unsigned long avenrun[]; /* Load averages */ | |
107 | ||
108 | #define FSHIFT 11 /* nr of bits of precision */ | |
109 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
110 | #define LOAD_FREQ (5*HZ) /* 5 sec intervals */ | |
111 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ | |
112 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
113 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
114 | ||
115 | #define CALC_LOAD(load,exp,n) \ | |
116 | load *= exp; \ | |
117 | load += n*(FIXED_1-exp); \ | |
118 | load >>= FSHIFT; | |
119 | ||
120 | extern unsigned long total_forks; | |
121 | extern int nr_threads; | |
1da177e4 LT |
122 | DECLARE_PER_CPU(unsigned long, process_counts); |
123 | extern int nr_processes(void); | |
124 | extern unsigned long nr_running(void); | |
125 | extern unsigned long nr_uninterruptible(void); | |
db1b1fef | 126 | extern unsigned long nr_active(void); |
1da177e4 | 127 | extern unsigned long nr_iowait(void); |
2dd73a4f | 128 | extern unsigned long weighted_cpuload(const int cpu); |
1da177e4 | 129 | |
1da177e4 | 130 | |
4a8342d2 LT |
131 | /* |
132 | * Task state bitmask. NOTE! These bits are also | |
133 | * encoded in fs/proc/array.c: get_task_state(). | |
134 | * | |
135 | * We have two separate sets of flags: task->state | |
136 | * is about runnability, while task->exit_state are | |
137 | * about the task exiting. Confusing, but this way | |
138 | * modifying one set can't modify the other one by | |
139 | * mistake. | |
140 | */ | |
1da177e4 LT |
141 | #define TASK_RUNNING 0 |
142 | #define TASK_INTERRUPTIBLE 1 | |
143 | #define TASK_UNINTERRUPTIBLE 2 | |
4a8342d2 LT |
144 | #define TASK_STOPPED 4 |
145 | #define TASK_TRACED 8 | |
146 | /* in tsk->exit_state */ | |
147 | #define EXIT_ZOMBIE 16 | |
148 | #define EXIT_DEAD 32 | |
149 | /* in tsk->state again */ | |
150 | #define TASK_NONINTERACTIVE 64 | |
c394cc9f | 151 | #define TASK_DEAD 128 |
1da177e4 LT |
152 | |
153 | #define __set_task_state(tsk, state_value) \ | |
154 | do { (tsk)->state = (state_value); } while (0) | |
155 | #define set_task_state(tsk, state_value) \ | |
156 | set_mb((tsk)->state, (state_value)) | |
157 | ||
498d0c57 AM |
158 | /* |
159 | * set_current_state() includes a barrier so that the write of current->state | |
160 | * is correctly serialised wrt the caller's subsequent test of whether to | |
161 | * actually sleep: | |
162 | * | |
163 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
164 | * if (do_i_need_to_sleep()) | |
165 | * schedule(); | |
166 | * | |
167 | * If the caller does not need such serialisation then use __set_current_state() | |
168 | */ | |
1da177e4 LT |
169 | #define __set_current_state(state_value) \ |
170 | do { current->state = (state_value); } while (0) | |
171 | #define set_current_state(state_value) \ | |
172 | set_mb(current->state, (state_value)) | |
173 | ||
174 | /* Task command name length */ | |
175 | #define TASK_COMM_LEN 16 | |
176 | ||
1da177e4 LT |
177 | #include <linux/spinlock.h> |
178 | ||
179 | /* | |
180 | * This serializes "schedule()" and also protects | |
181 | * the run-queue from deletions/modifications (but | |
182 | * _adding_ to the beginning of the run-queue has | |
183 | * a separate lock). | |
184 | */ | |
185 | extern rwlock_t tasklist_lock; | |
186 | extern spinlock_t mmlist_lock; | |
187 | ||
36c8b586 | 188 | struct task_struct; |
1da177e4 LT |
189 | |
190 | extern void sched_init(void); | |
191 | extern void sched_init_smp(void); | |
36c8b586 | 192 | extern void init_idle(struct task_struct *idle, int cpu); |
1da177e4 LT |
193 | |
194 | extern cpumask_t nohz_cpu_mask; | |
195 | ||
196 | extern void show_state(void); | |
197 | extern void show_regs(struct pt_regs *); | |
198 | ||
199 | /* | |
200 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
201 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
202 | * trace (or NULL if the entire call-chain of the task should be shown). | |
203 | */ | |
204 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
205 | ||
206 | void io_schedule(void); | |
207 | long io_schedule_timeout(long timeout); | |
208 | ||
209 | extern void cpu_init (void); | |
210 | extern void trap_init(void); | |
211 | extern void update_process_times(int user); | |
212 | extern void scheduler_tick(void); | |
213 | ||
8446f1d3 | 214 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
6687a97d | 215 | extern void softlockup_tick(void); |
8446f1d3 IM |
216 | extern void spawn_softlockup_task(void); |
217 | extern void touch_softlockup_watchdog(void); | |
218 | #else | |
6687a97d | 219 | static inline void softlockup_tick(void) |
8446f1d3 IM |
220 | { |
221 | } | |
222 | static inline void spawn_softlockup_task(void) | |
223 | { | |
224 | } | |
225 | static inline void touch_softlockup_watchdog(void) | |
226 | { | |
227 | } | |
228 | #endif | |
229 | ||
230 | ||
1da177e4 LT |
231 | /* Attach to any functions which should be ignored in wchan output. */ |
232 | #define __sched __attribute__((__section__(".sched.text"))) | |
233 | /* Is this address in the __sched functions? */ | |
234 | extern int in_sched_functions(unsigned long addr); | |
235 | ||
236 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
237 | extern signed long FASTCALL(schedule_timeout(signed long timeout)); | |
64ed93a2 NA |
238 | extern signed long schedule_timeout_interruptible(signed long timeout); |
239 | extern signed long schedule_timeout_uninterruptible(signed long timeout); | |
1da177e4 LT |
240 | asmlinkage void schedule(void); |
241 | ||
ab516013 | 242 | struct nsproxy; |
1da177e4 LT |
243 | |
244 | /* Maximum number of active map areas.. This is a random (large) number */ | |
245 | #define DEFAULT_MAX_MAP_COUNT 65536 | |
246 | ||
247 | extern int sysctl_max_map_count; | |
248 | ||
249 | #include <linux/aio.h> | |
250 | ||
251 | extern unsigned long | |
252 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
253 | unsigned long, unsigned long); | |
254 | extern unsigned long | |
255 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
256 | unsigned long len, unsigned long pgoff, | |
257 | unsigned long flags); | |
1363c3cd WW |
258 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
259 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
1da177e4 | 260 | |
f412ac08 HD |
261 | #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS |
262 | /* | |
263 | * The mm counters are not protected by its page_table_lock, | |
264 | * so must be incremented atomically. | |
265 | */ | |
d3cb4871 CL |
266 | #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) |
267 | #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) | |
268 | #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) | |
269 | #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) | |
270 | #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) | |
271 | typedef atomic_long_t mm_counter_t; | |
f412ac08 HD |
272 | |
273 | #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ | |
274 | /* | |
275 | * The mm counters are protected by its page_table_lock, | |
276 | * so can be incremented directly. | |
277 | */ | |
1da177e4 LT |
278 | #define set_mm_counter(mm, member, value) (mm)->_##member = (value) |
279 | #define get_mm_counter(mm, member) ((mm)->_##member) | |
280 | #define add_mm_counter(mm, member, value) (mm)->_##member += (value) | |
281 | #define inc_mm_counter(mm, member) (mm)->_##member++ | |
282 | #define dec_mm_counter(mm, member) (mm)->_##member-- | |
f412ac08 HD |
283 | typedef unsigned long mm_counter_t; |
284 | ||
285 | #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ | |
4294621f | 286 | |
f412ac08 HD |
287 | #define get_mm_rss(mm) \ |
288 | (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) | |
365e9c87 HD |
289 | #define update_hiwater_rss(mm) do { \ |
290 | unsigned long _rss = get_mm_rss(mm); \ | |
291 | if ((mm)->hiwater_rss < _rss) \ | |
292 | (mm)->hiwater_rss = _rss; \ | |
293 | } while (0) | |
294 | #define update_hiwater_vm(mm) do { \ | |
295 | if ((mm)->hiwater_vm < (mm)->total_vm) \ | |
296 | (mm)->hiwater_vm = (mm)->total_vm; \ | |
297 | } while (0) | |
298 | ||
1da177e4 LT |
299 | struct mm_struct { |
300 | struct vm_area_struct * mmap; /* list of VMAs */ | |
301 | struct rb_root mm_rb; | |
302 | struct vm_area_struct * mmap_cache; /* last find_vma result */ | |
303 | unsigned long (*get_unmapped_area) (struct file *filp, | |
304 | unsigned long addr, unsigned long len, | |
305 | unsigned long pgoff, unsigned long flags); | |
1363c3cd | 306 | void (*unmap_area) (struct mm_struct *mm, unsigned long addr); |
0551fbd2 BH |
307 | unsigned long mmap_base; /* base of mmap area */ |
308 | unsigned long task_size; /* size of task vm space */ | |
309 | unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ | |
1363c3cd | 310 | unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ |
1da177e4 LT |
311 | pgd_t * pgd; |
312 | atomic_t mm_users; /* How many users with user space? */ | |
313 | atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ | |
314 | int map_count; /* number of VMAs */ | |
315 | struct rw_semaphore mmap_sem; | |
316 | spinlock_t page_table_lock; /* Protects page tables and some counters */ | |
317 | ||
318 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung | |
319 | * together off init_mm.mmlist, and are protected | |
320 | * by mmlist_lock | |
321 | */ | |
322 | ||
f412ac08 HD |
323 | /* Special counters, in some configurations protected by the |
324 | * page_table_lock, in other configurations by being atomic. | |
325 | */ | |
4294621f | 326 | mm_counter_t _file_rss; |
1da177e4 LT |
327 | mm_counter_t _anon_rss; |
328 | ||
f449952b HD |
329 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ |
330 | unsigned long hiwater_vm; /* High-water virtual memory usage */ | |
331 | ||
332 | unsigned long total_vm, locked_vm, shared_vm, exec_vm; | |
333 | unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; | |
334 | unsigned long start_code, end_code, start_data, end_data; | |
335 | unsigned long start_brk, brk, start_stack; | |
336 | unsigned long arg_start, arg_end, env_start, env_end; | |
337 | ||
36d57ac4 | 338 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ |
1da177e4 | 339 | |
d6e71144 | 340 | unsigned dumpable:2; |
1da177e4 LT |
341 | cpumask_t cpu_vm_mask; |
342 | ||
343 | /* Architecture-specific MM context */ | |
344 | mm_context_t context; | |
345 | ||
346 | /* Token based thrashing protection. */ | |
347 | unsigned long swap_token_time; | |
348 | char recent_pagein; | |
349 | ||
350 | /* coredumping support */ | |
351 | int core_waiters; | |
352 | struct completion *core_startup_done, core_done; | |
353 | ||
354 | /* aio bits */ | |
355 | rwlock_t ioctx_list_lock; | |
356 | struct kioctx *ioctx_list; | |
1da177e4 LT |
357 | }; |
358 | ||
359 | struct sighand_struct { | |
360 | atomic_t count; | |
361 | struct k_sigaction action[_NSIG]; | |
362 | spinlock_t siglock; | |
363 | }; | |
364 | ||
0e464814 | 365 | struct pacct_struct { |
f6ec29a4 KK |
366 | int ac_flag; |
367 | long ac_exitcode; | |
0e464814 | 368 | unsigned long ac_mem; |
77787bfb KK |
369 | cputime_t ac_utime, ac_stime; |
370 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
371 | }; |
372 | ||
1da177e4 LT |
373 | /* |
374 | * NOTE! "signal_struct" does not have it's own | |
375 | * locking, because a shared signal_struct always | |
376 | * implies a shared sighand_struct, so locking | |
377 | * sighand_struct is always a proper superset of | |
378 | * the locking of signal_struct. | |
379 | */ | |
380 | struct signal_struct { | |
381 | atomic_t count; | |
382 | atomic_t live; | |
383 | ||
384 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
385 | ||
386 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 387 | struct task_struct *curr_target; |
1da177e4 LT |
388 | |
389 | /* shared signal handling: */ | |
390 | struct sigpending shared_pending; | |
391 | ||
392 | /* thread group exit support */ | |
393 | int group_exit_code; | |
394 | /* overloaded: | |
395 | * - notify group_exit_task when ->count is equal to notify_count | |
396 | * - everyone except group_exit_task is stopped during signal delivery | |
397 | * of fatal signals, group_exit_task processes the signal. | |
398 | */ | |
399 | struct task_struct *group_exit_task; | |
400 | int notify_count; | |
401 | ||
402 | /* thread group stop support, overloads group_exit_code too */ | |
403 | int group_stop_count; | |
404 | unsigned int flags; /* see SIGNAL_* flags below */ | |
405 | ||
406 | /* POSIX.1b Interval Timers */ | |
407 | struct list_head posix_timers; | |
408 | ||
409 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 410 | struct hrtimer real_timer; |
05cfb614 | 411 | struct task_struct *tsk; |
2ff678b8 | 412 | ktime_t it_real_incr; |
1da177e4 LT |
413 | |
414 | /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ | |
415 | cputime_t it_prof_expires, it_virt_expires; | |
416 | cputime_t it_prof_incr, it_virt_incr; | |
417 | ||
418 | /* job control IDs */ | |
419 | pid_t pgrp; | |
420 | pid_t tty_old_pgrp; | |
421 | pid_t session; | |
422 | /* boolean value for session group leader */ | |
423 | int leader; | |
424 | ||
425 | struct tty_struct *tty; /* NULL if no tty */ | |
426 | ||
427 | /* | |
428 | * Cumulative resource counters for dead threads in the group, | |
429 | * and for reaped dead child processes forked by this group. | |
430 | * Live threads maintain their own counters and add to these | |
431 | * in __exit_signal, except for the group leader. | |
432 | */ | |
433 | cputime_t utime, stime, cutime, cstime; | |
434 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; | |
435 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
436 | ||
437 | /* | |
438 | * Cumulative ns of scheduled CPU time for dead threads in the | |
439 | * group, not including a zombie group leader. (This only differs | |
440 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
441 | * other than jiffies.) | |
442 | */ | |
443 | unsigned long long sched_time; | |
444 | ||
445 | /* | |
446 | * We don't bother to synchronize most readers of this at all, | |
447 | * because there is no reader checking a limit that actually needs | |
448 | * to get both rlim_cur and rlim_max atomically, and either one | |
449 | * alone is a single word that can safely be read normally. | |
450 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
451 | * protect this instead of the siglock, because they really | |
452 | * have no need to disable irqs. | |
453 | */ | |
454 | struct rlimit rlim[RLIM_NLIMITS]; | |
455 | ||
456 | struct list_head cpu_timers[3]; | |
457 | ||
458 | /* keep the process-shared keyrings here so that they do the right | |
459 | * thing in threads created with CLONE_THREAD */ | |
460 | #ifdef CONFIG_KEYS | |
461 | struct key *session_keyring; /* keyring inherited over fork */ | |
462 | struct key *process_keyring; /* keyring private to this process */ | |
463 | #endif | |
0e464814 KK |
464 | #ifdef CONFIG_BSD_PROCESS_ACCT |
465 | struct pacct_struct pacct; /* per-process accounting information */ | |
466 | #endif | |
ad4ecbcb SN |
467 | #ifdef CONFIG_TASKSTATS |
468 | spinlock_t stats_lock; | |
469 | struct taskstats *stats; | |
470 | #endif | |
1da177e4 LT |
471 | }; |
472 | ||
4866cde0 NP |
473 | /* Context switch must be unlocked if interrupts are to be enabled */ |
474 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW | |
475 | # define __ARCH_WANT_UNLOCKED_CTXSW | |
476 | #endif | |
477 | ||
1da177e4 LT |
478 | /* |
479 | * Bits in flags field of signal_struct. | |
480 | */ | |
481 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
482 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ | |
483 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ | |
484 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ | |
485 | ||
486 | ||
487 | /* | |
488 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
b0a9499c IM |
489 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH |
490 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority | |
491 | * values are inverted: lower p->prio value means higher priority. | |
1da177e4 LT |
492 | * |
493 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
494 | * RT priority to be separate from the value exported to | |
495 | * user-space. This allows kernel threads to set their | |
496 | * priority to a value higher than any user task. Note: | |
497 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
498 | */ | |
499 | ||
500 | #define MAX_USER_RT_PRIO 100 | |
501 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
502 | ||
503 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
504 | ||
b29739f9 IM |
505 | #define rt_prio(prio) unlikely((prio) < MAX_RT_PRIO) |
506 | #define rt_task(p) rt_prio((p)->prio) | |
d425b274 | 507 | #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH)) |
57a6f51c ON |
508 | #define is_rt_policy(p) ((p) != SCHED_NORMAL && (p) != SCHED_BATCH) |
509 | #define has_rt_policy(p) unlikely(is_rt_policy((p)->policy)) | |
1da177e4 LT |
510 | |
511 | /* | |
512 | * Some day this will be a full-fledged user tracking system.. | |
513 | */ | |
514 | struct user_struct { | |
515 | atomic_t __count; /* reference count */ | |
516 | atomic_t processes; /* How many processes does this user have? */ | |
517 | atomic_t files; /* How many open files does this user have? */ | |
518 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 519 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
520 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
521 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
522 | #endif | |
1da177e4 LT |
523 | /* protected by mq_lock */ |
524 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
525 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ | |
526 | ||
527 | #ifdef CONFIG_KEYS | |
528 | struct key *uid_keyring; /* UID specific keyring */ | |
529 | struct key *session_keyring; /* UID's default session keyring */ | |
530 | #endif | |
531 | ||
532 | /* Hash table maintenance information */ | |
533 | struct list_head uidhash_list; | |
534 | uid_t uid; | |
535 | }; | |
536 | ||
537 | extern struct user_struct *find_user(uid_t); | |
538 | ||
539 | extern struct user_struct root_user; | |
540 | #define INIT_USER (&root_user) | |
541 | ||
1da177e4 LT |
542 | struct backing_dev_info; |
543 | struct reclaim_state; | |
544 | ||
52f17b6c | 545 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
546 | struct sched_info { |
547 | /* cumulative counters */ | |
548 | unsigned long cpu_time, /* time spent on the cpu */ | |
549 | run_delay, /* time spent waiting on a runqueue */ | |
550 | pcnt; /* # of timeslices run on this cpu */ | |
551 | ||
552 | /* timestamps */ | |
553 | unsigned long last_arrival, /* when we last ran on a cpu */ | |
554 | last_queued; /* when we were last queued to run */ | |
555 | }; | |
52f17b6c | 556 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 557 | |
52f17b6c | 558 | #ifdef CONFIG_SCHEDSTATS |
1da177e4 | 559 | extern struct file_operations proc_schedstat_operations; |
52f17b6c | 560 | #endif /* CONFIG_SCHEDSTATS */ |
1da177e4 | 561 | |
ca74e92b SN |
562 | #ifdef CONFIG_TASK_DELAY_ACCT |
563 | struct task_delay_info { | |
564 | spinlock_t lock; | |
565 | unsigned int flags; /* Private per-task flags */ | |
566 | ||
567 | /* For each stat XXX, add following, aligned appropriately | |
568 | * | |
569 | * struct timespec XXX_start, XXX_end; | |
570 | * u64 XXX_delay; | |
571 | * u32 XXX_count; | |
572 | * | |
573 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
574 | * single lock above (split into XXX_lock if contention is an issue). | |
575 | */ | |
0ff92245 SN |
576 | |
577 | /* | |
578 | * XXX_count is incremented on every XXX operation, the delay | |
579 | * associated with the operation is added to XXX_delay. | |
580 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
581 | */ | |
582 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
583 | u64 blkio_delay; /* wait for sync block io completion */ | |
584 | u64 swapin_delay; /* wait for swapin block io completion */ | |
585 | u32 blkio_count; /* total count of the number of sync block */ | |
586 | /* io operations performed */ | |
587 | u32 swapin_count; /* total count of the number of swapin block */ | |
588 | /* io operations performed */ | |
ca74e92b | 589 | }; |
52f17b6c CS |
590 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
591 | ||
592 | static inline int sched_info_on(void) | |
593 | { | |
594 | #ifdef CONFIG_SCHEDSTATS | |
595 | return 1; | |
596 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
597 | extern int delayacct_on; | |
598 | return delayacct_on; | |
599 | #else | |
600 | return 0; | |
ca74e92b | 601 | #endif |
52f17b6c | 602 | } |
ca74e92b | 603 | |
1da177e4 LT |
604 | enum idle_type |
605 | { | |
606 | SCHED_IDLE, | |
607 | NOT_IDLE, | |
608 | NEWLY_IDLE, | |
609 | MAX_IDLE_TYPES | |
610 | }; | |
611 | ||
612 | /* | |
613 | * sched-domains (multiprocessor balancing) declarations: | |
614 | */ | |
1da177e4 LT |
615 | #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */ |
616 | ||
2dd73a4f | 617 | #ifdef CONFIG_SMP |
1da177e4 LT |
618 | #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ |
619 | #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ | |
620 | #define SD_BALANCE_EXEC 4 /* Balance on exec */ | |
147cbb4b NP |
621 | #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ |
622 | #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ | |
623 | #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ | |
624 | #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ | |
625 | #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ | |
5c45bf27 SS |
626 | #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ |
627 | ||
628 | #define BALANCE_FOR_POWER ((sched_mc_power_savings || sched_smt_power_savings) \ | |
629 | ? SD_POWERSAVINGS_BALANCE : 0) | |
630 | ||
1da177e4 LT |
631 | |
632 | struct sched_group { | |
633 | struct sched_group *next; /* Must be a circular list */ | |
634 | cpumask_t cpumask; | |
635 | ||
636 | /* | |
637 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
638 | * single CPU. This is read only (except for setup, hotplug CPU). | |
639 | */ | |
640 | unsigned long cpu_power; | |
641 | }; | |
642 | ||
643 | struct sched_domain { | |
644 | /* These fields must be setup */ | |
645 | struct sched_domain *parent; /* top domain must be null terminated */ | |
646 | struct sched_group *groups; /* the balancing groups of the domain */ | |
647 | cpumask_t span; /* span of all CPUs in this domain */ | |
648 | unsigned long min_interval; /* Minimum balance interval ms */ | |
649 | unsigned long max_interval; /* Maximum balance interval ms */ | |
650 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
651 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
652 | unsigned long long cache_hot_time; /* Task considered cache hot (ns) */ | |
653 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ | |
654 | unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */ | |
7897986b NP |
655 | unsigned int busy_idx; |
656 | unsigned int idle_idx; | |
657 | unsigned int newidle_idx; | |
658 | unsigned int wake_idx; | |
147cbb4b | 659 | unsigned int forkexec_idx; |
1da177e4 LT |
660 | int flags; /* See SD_* */ |
661 | ||
662 | /* Runtime fields. */ | |
663 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
664 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
665 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
666 | ||
667 | #ifdef CONFIG_SCHEDSTATS | |
668 | /* load_balance() stats */ | |
669 | unsigned long lb_cnt[MAX_IDLE_TYPES]; | |
670 | unsigned long lb_failed[MAX_IDLE_TYPES]; | |
671 | unsigned long lb_balanced[MAX_IDLE_TYPES]; | |
672 | unsigned long lb_imbalance[MAX_IDLE_TYPES]; | |
673 | unsigned long lb_gained[MAX_IDLE_TYPES]; | |
674 | unsigned long lb_hot_gained[MAX_IDLE_TYPES]; | |
675 | unsigned long lb_nobusyg[MAX_IDLE_TYPES]; | |
676 | unsigned long lb_nobusyq[MAX_IDLE_TYPES]; | |
677 | ||
678 | /* Active load balancing */ | |
679 | unsigned long alb_cnt; | |
680 | unsigned long alb_failed; | |
681 | unsigned long alb_pushed; | |
682 | ||
68767a0a NP |
683 | /* SD_BALANCE_EXEC stats */ |
684 | unsigned long sbe_cnt; | |
685 | unsigned long sbe_balanced; | |
1da177e4 LT |
686 | unsigned long sbe_pushed; |
687 | ||
68767a0a NP |
688 | /* SD_BALANCE_FORK stats */ |
689 | unsigned long sbf_cnt; | |
690 | unsigned long sbf_balanced; | |
691 | unsigned long sbf_pushed; | |
692 | ||
1da177e4 LT |
693 | /* try_to_wake_up() stats */ |
694 | unsigned long ttwu_wake_remote; | |
695 | unsigned long ttwu_move_affine; | |
696 | unsigned long ttwu_move_balance; | |
697 | #endif | |
698 | }; | |
699 | ||
51888ca2 | 700 | extern int partition_sched_domains(cpumask_t *partition1, |
1a20ff27 | 701 | cpumask_t *partition2); |
198e2f18 | 702 | |
703 | /* | |
704 | * Maximum cache size the migration-costs auto-tuning code will | |
705 | * search from: | |
706 | */ | |
707 | extern unsigned int max_cache_size; | |
708 | ||
709 | #endif /* CONFIG_SMP */ | |
1da177e4 LT |
710 | |
711 | ||
712 | struct io_context; /* See blkdev.h */ | |
1da177e4 LT |
713 | struct cpuset; |
714 | ||
715 | #define NGROUPS_SMALL 32 | |
716 | #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) | |
717 | struct group_info { | |
718 | int ngroups; | |
719 | atomic_t usage; | |
720 | gid_t small_block[NGROUPS_SMALL]; | |
721 | int nblocks; | |
722 | gid_t *blocks[0]; | |
723 | }; | |
724 | ||
725 | /* | |
726 | * get_group_info() must be called with the owning task locked (via task_lock()) | |
727 | * when task != current. The reason being that the vast majority of callers are | |
728 | * looking at current->group_info, which can not be changed except by the | |
729 | * current task. Changing current->group_info requires the task lock, too. | |
730 | */ | |
731 | #define get_group_info(group_info) do { \ | |
732 | atomic_inc(&(group_info)->usage); \ | |
733 | } while (0) | |
734 | ||
735 | #define put_group_info(group_info) do { \ | |
736 | if (atomic_dec_and_test(&(group_info)->usage)) \ | |
737 | groups_free(group_info); \ | |
738 | } while (0) | |
739 | ||
3e30148c DH |
740 | extern struct group_info *groups_alloc(int gidsetsize); |
741 | extern void groups_free(struct group_info *group_info); | |
742 | extern int set_current_groups(struct group_info *group_info); | |
743 | extern int groups_search(struct group_info *group_info, gid_t grp); | |
1da177e4 LT |
744 | /* access the groups "array" with this macro */ |
745 | #define GROUP_AT(gi, i) \ | |
746 | ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) | |
747 | ||
383f2835 | 748 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 749 | extern void prefetch_stack(struct task_struct *t); |
383f2835 KC |
750 | #else |
751 | static inline void prefetch_stack(struct task_struct *t) { } | |
752 | #endif | |
1da177e4 LT |
753 | |
754 | struct audit_context; /* See audit.c */ | |
755 | struct mempolicy; | |
b92ce558 | 756 | struct pipe_inode_info; |
4865ecf1 | 757 | struct uts_namespace; |
1da177e4 | 758 | |
3dee386e CK |
759 | enum sleep_type { |
760 | SLEEP_NORMAL, | |
761 | SLEEP_NONINTERACTIVE, | |
762 | SLEEP_INTERACTIVE, | |
763 | SLEEP_INTERRUPTED, | |
764 | }; | |
765 | ||
70b97a7f IM |
766 | struct prio_array; |
767 | ||
1da177e4 LT |
768 | struct task_struct { |
769 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
770 | struct thread_info *thread_info; | |
771 | atomic_t usage; | |
772 | unsigned long flags; /* per process flags, defined below */ | |
773 | unsigned long ptrace; | |
774 | ||
36772092 | 775 | int lock_depth; /* BKL lock depth */ |
1da177e4 | 776 | |
2dd73a4f PW |
777 | #ifdef CONFIG_SMP |
778 | #ifdef __ARCH_WANT_UNLOCKED_CTXSW | |
4866cde0 NP |
779 | int oncpu; |
780 | #endif | |
2dd73a4f PW |
781 | #endif |
782 | int load_weight; /* for niceness load balancing purposes */ | |
b29739f9 | 783 | int prio, static_prio, normal_prio; |
1da177e4 | 784 | struct list_head run_list; |
70b97a7f | 785 | struct prio_array *array; |
1da177e4 | 786 | |
22e2c507 | 787 | unsigned short ioprio; |
6c5c9341 | 788 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 789 | unsigned int btrace_seq; |
6c5c9341 | 790 | #endif |
1da177e4 LT |
791 | unsigned long sleep_avg; |
792 | unsigned long long timestamp, last_ran; | |
793 | unsigned long long sched_time; /* sched_clock time spent running */ | |
3dee386e | 794 | enum sleep_type sleep_type; |
1da177e4 LT |
795 | |
796 | unsigned long policy; | |
797 | cpumask_t cpus_allowed; | |
798 | unsigned int time_slice, first_time_slice; | |
799 | ||
52f17b6c | 800 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
801 | struct sched_info sched_info; |
802 | #endif | |
803 | ||
804 | struct list_head tasks; | |
805 | /* | |
806 | * ptrace_list/ptrace_children forms the list of my children | |
807 | * that were stolen by a ptracer. | |
808 | */ | |
809 | struct list_head ptrace_children; | |
810 | struct list_head ptrace_list; | |
811 | ||
812 | struct mm_struct *mm, *active_mm; | |
813 | ||
814 | /* task state */ | |
815 | struct linux_binfmt *binfmt; | |
816 | long exit_state; | |
817 | int exit_code, exit_signal; | |
818 | int pdeath_signal; /* The signal sent when the parent dies */ | |
819 | /* ??? */ | |
820 | unsigned long personality; | |
821 | unsigned did_exec:1; | |
822 | pid_t pid; | |
823 | pid_t tgid; | |
0a425405 AV |
824 | |
825 | #ifdef CONFIG_CC_STACKPROTECTOR | |
826 | /* Canary value for the -fstack-protector gcc feature */ | |
827 | unsigned long stack_canary; | |
828 | #endif | |
1da177e4 LT |
829 | /* |
830 | * pointers to (original) parent process, youngest child, younger sibling, | |
831 | * older sibling, respectively. (p->father can be replaced with | |
832 | * p->parent->pid) | |
833 | */ | |
834 | struct task_struct *real_parent; /* real parent process (when being debugged) */ | |
835 | struct task_struct *parent; /* parent process */ | |
836 | /* | |
837 | * children/sibling forms the list of my children plus the | |
838 | * tasks I'm ptracing. | |
839 | */ | |
840 | struct list_head children; /* list of my children */ | |
841 | struct list_head sibling; /* linkage in my parent's children list */ | |
842 | struct task_struct *group_leader; /* threadgroup leader */ | |
843 | ||
844 | /* PID/PID hash table linkage. */ | |
92476d7f | 845 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 846 | struct list_head thread_group; |
1da177e4 LT |
847 | |
848 | struct completion *vfork_done; /* for vfork() */ | |
849 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
850 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
851 | ||
852 | unsigned long rt_priority; | |
853 | cputime_t utime, stime; | |
854 | unsigned long nvcsw, nivcsw; /* context switch counts */ | |
855 | struct timespec start_time; | |
856 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ | |
857 | unsigned long min_flt, maj_flt; | |
858 | ||
859 | cputime_t it_prof_expires, it_virt_expires; | |
860 | unsigned long long it_sched_expires; | |
861 | struct list_head cpu_timers[3]; | |
862 | ||
863 | /* process credentials */ | |
864 | uid_t uid,euid,suid,fsuid; | |
865 | gid_t gid,egid,sgid,fsgid; | |
866 | struct group_info *group_info; | |
867 | kernel_cap_t cap_effective, cap_inheritable, cap_permitted; | |
868 | unsigned keep_capabilities:1; | |
869 | struct user_struct *user; | |
870 | #ifdef CONFIG_KEYS | |
b5f545c8 | 871 | struct key *request_key_auth; /* assumed request_key authority */ |
1da177e4 | 872 | struct key *thread_keyring; /* keyring private to this thread */ |
3e30148c | 873 | unsigned char jit_keyring; /* default keyring to attach requested keys to */ |
1da177e4 | 874 | #endif |
e07e23e1 AV |
875 | /* |
876 | * fpu_counter contains the number of consecutive context switches | |
877 | * that the FPU is used. If this is over a threshold, the lazy fpu | |
878 | * saving becomes unlazy to save the trap. This is an unsigned char | |
879 | * so that after 256 times the counter wraps and the behavior turns | |
880 | * lazy again; this to deal with bursty apps that only use FPU for | |
881 | * a short time | |
882 | */ | |
883 | unsigned char fpu_counter; | |
1da177e4 | 884 | int oomkilladj; /* OOM kill score adjustment (bit shift). */ |
36772092 PBG |
885 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
886 | - access with [gs]et_task_comm (which lock | |
887 | it with task_lock()) | |
888 | - initialized normally by flush_old_exec */ | |
1da177e4 LT |
889 | /* file system info */ |
890 | int link_count, total_link_count; | |
3d5b6fcc | 891 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
892 | /* ipc stuff */ |
893 | struct sysv_sem sysvsem; | |
3d5b6fcc | 894 | #endif |
1da177e4 LT |
895 | /* CPU-specific state of this task */ |
896 | struct thread_struct thread; | |
897 | /* filesystem information */ | |
898 | struct fs_struct *fs; | |
899 | /* open file information */ | |
900 | struct files_struct *files; | |
1651e14e | 901 | /* namespaces */ |
ab516013 | 902 | struct nsproxy *nsproxy; |
1da177e4 LT |
903 | /* signal handlers */ |
904 | struct signal_struct *signal; | |
905 | struct sighand_struct *sighand; | |
906 | ||
907 | sigset_t blocked, real_blocked; | |
150256d8 | 908 | sigset_t saved_sigmask; /* To be restored with TIF_RESTORE_SIGMASK */ |
1da177e4 LT |
909 | struct sigpending pending; |
910 | ||
911 | unsigned long sas_ss_sp; | |
912 | size_t sas_ss_size; | |
913 | int (*notifier)(void *priv); | |
914 | void *notifier_data; | |
915 | sigset_t *notifier_mask; | |
916 | ||
917 | void *security; | |
918 | struct audit_context *audit_context; | |
919 | seccomp_t seccomp; | |
920 | ||
921 | /* Thread group tracking */ | |
922 | u32 parent_exec_id; | |
923 | u32 self_exec_id; | |
924 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ | |
925 | spinlock_t alloc_lock; | |
1da177e4 | 926 | |
b29739f9 IM |
927 | /* Protection of the PI data structures: */ |
928 | spinlock_t pi_lock; | |
929 | ||
23f78d4a IM |
930 | #ifdef CONFIG_RT_MUTEXES |
931 | /* PI waiters blocked on a rt_mutex held by this task */ | |
932 | struct plist_head pi_waiters; | |
933 | /* Deadlock detection and priority inheritance handling */ | |
934 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
935 | #endif |
936 | ||
408894ee IM |
937 | #ifdef CONFIG_DEBUG_MUTEXES |
938 | /* mutex deadlock detection */ | |
939 | struct mutex_waiter *blocked_on; | |
940 | #endif | |
de30a2b3 IM |
941 | #ifdef CONFIG_TRACE_IRQFLAGS |
942 | unsigned int irq_events; | |
943 | int hardirqs_enabled; | |
944 | unsigned long hardirq_enable_ip; | |
945 | unsigned int hardirq_enable_event; | |
946 | unsigned long hardirq_disable_ip; | |
947 | unsigned int hardirq_disable_event; | |
948 | int softirqs_enabled; | |
949 | unsigned long softirq_disable_ip; | |
950 | unsigned int softirq_disable_event; | |
951 | unsigned long softirq_enable_ip; | |
952 | unsigned int softirq_enable_event; | |
953 | int hardirq_context; | |
954 | int softirq_context; | |
955 | #endif | |
fbb9ce95 IM |
956 | #ifdef CONFIG_LOCKDEP |
957 | # define MAX_LOCK_DEPTH 30UL | |
958 | u64 curr_chain_key; | |
959 | int lockdep_depth; | |
960 | struct held_lock held_locks[MAX_LOCK_DEPTH]; | |
961 | unsigned int lockdep_recursion; | |
962 | #endif | |
408894ee | 963 | |
1da177e4 LT |
964 | /* journalling filesystem info */ |
965 | void *journal_info; | |
966 | ||
967 | /* VM state */ | |
968 | struct reclaim_state *reclaim_state; | |
969 | ||
1da177e4 LT |
970 | struct backing_dev_info *backing_dev_info; |
971 | ||
972 | struct io_context *io_context; | |
973 | ||
974 | unsigned long ptrace_message; | |
975 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
976 | /* | |
977 | * current io wait handle: wait queue entry to use for io waits | |
978 | * If this thread is processing aio, this points at the waitqueue | |
979 | * inside the currently handled kiocb. It may be NULL (i.e. default | |
980 | * to a stack based synchronous wait) if its doing sync IO. | |
981 | */ | |
982 | wait_queue_t *io_wait; | |
983 | /* i/o counters(bytes read/written, #syscalls */ | |
984 | u64 rchar, wchar, syscr, syscw; | |
8f0ab514 | 985 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
986 | u64 acct_rss_mem1; /* accumulated rss usage */ |
987 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
db5fed26 | 988 | cputime_t acct_stimexpd;/* stime since last update */ |
1da177e4 LT |
989 | #endif |
990 | #ifdef CONFIG_NUMA | |
991 | struct mempolicy *mempolicy; | |
992 | short il_next; | |
993 | #endif | |
994 | #ifdef CONFIG_CPUSETS | |
995 | struct cpuset *cpuset; | |
996 | nodemask_t mems_allowed; | |
997 | int cpuset_mems_generation; | |
825a46af | 998 | int cpuset_mem_spread_rotor; |
1da177e4 | 999 | #endif |
0771dfef | 1000 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1001 | #ifdef CONFIG_COMPAT |
1002 | struct compat_robust_list_head __user *compat_robust_list; | |
1003 | #endif | |
c87e2837 IM |
1004 | struct list_head pi_state_list; |
1005 | struct futex_pi_state *pi_state_cache; | |
0771dfef | 1006 | |
22e2c507 | 1007 | atomic_t fs_excl; /* holding fs exclusive resources */ |
e56d0903 | 1008 | struct rcu_head rcu; |
b92ce558 JA |
1009 | |
1010 | /* | |
1011 | * cache last used pipe for splice | |
1012 | */ | |
1013 | struct pipe_inode_info *splice_pipe; | |
ca74e92b SN |
1014 | #ifdef CONFIG_TASK_DELAY_ACCT |
1015 | struct task_delay_info *delays; | |
1016 | #endif | |
1da177e4 LT |
1017 | }; |
1018 | ||
1019 | static inline pid_t process_group(struct task_struct *tsk) | |
1020 | { | |
1021 | return tsk->signal->pgrp; | |
1022 | } | |
1023 | ||
22c935f4 EB |
1024 | static inline struct pid *task_pid(struct task_struct *task) |
1025 | { | |
1026 | return task->pids[PIDTYPE_PID].pid; | |
1027 | } | |
1028 | ||
1029 | static inline struct pid *task_tgid(struct task_struct *task) | |
1030 | { | |
1031 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1032 | } | |
1033 | ||
1034 | static inline struct pid *task_pgrp(struct task_struct *task) | |
1035 | { | |
1036 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1037 | } | |
1038 | ||
1039 | static inline struct pid *task_session(struct task_struct *task) | |
1040 | { | |
1041 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1042 | } | |
1043 | ||
1da177e4 LT |
1044 | /** |
1045 | * pid_alive - check that a task structure is not stale | |
1046 | * @p: Task structure to be checked. | |
1047 | * | |
1048 | * Test if a process is not yet dead (at most zombie state) | |
1049 | * If pid_alive fails, then pointers within the task structure | |
1050 | * can be stale and must not be dereferenced. | |
1051 | */ | |
1052 | static inline int pid_alive(struct task_struct *p) | |
1053 | { | |
92476d7f | 1054 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1055 | } |
1056 | ||
f400e198 SB |
1057 | /** |
1058 | * is_init - check if a task structure is the first user space | |
1059 | * task the kernel created. | |
1060 | * @p: Task structure to be checked. | |
1061 | */ | |
1062 | static inline int is_init(struct task_struct *tsk) | |
1063 | { | |
1064 | return tsk->pid == 1; | |
1065 | } | |
1066 | ||
1da177e4 | 1067 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1068 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1069 | |
158d9ebd | 1070 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1071 | |
1072 | static inline void put_task_struct(struct task_struct *t) | |
1073 | { | |
1074 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1075 | __put_task_struct(t); |
e56d0903 | 1076 | } |
1da177e4 LT |
1077 | |
1078 | /* | |
1079 | * Per process flags | |
1080 | */ | |
1081 | #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ | |
1082 | /* Not implemented yet, only for 486*/ | |
1083 | #define PF_STARTING 0x00000002 /* being created */ | |
1084 | #define PF_EXITING 0x00000004 /* getting shut down */ | |
1da177e4 LT |
1085 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
1086 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ | |
1087 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1088 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1089 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1090 | #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ | |
1091 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ | |
1092 | #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */ | |
1093 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ | |
1094 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1095 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1096 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
1097 | #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ | |
1098 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ | |
b31dc66a JA |
1099 | #define PF_BORROWED_MM 0x00200000 /* I am a kthread doing use_mm */ |
1100 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ | |
1101 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1102 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1103 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
c61afb18 | 1104 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
61a87122 | 1105 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
1da177e4 LT |
1106 | |
1107 | /* | |
1108 | * Only the _current_ task can read/write to tsk->flags, but other | |
1109 | * tasks can access tsk->flags in readonly mode for example | |
1110 | * with tsk_used_math (like during threaded core dumping). | |
1111 | * There is however an exception to this rule during ptrace | |
1112 | * or during fork: the ptracer task is allowed to write to the | |
1113 | * child->flags of its traced child (same goes for fork, the parent | |
1114 | * can write to the child->flags), because we're guaranteed the | |
1115 | * child is not running and in turn not changing child->flags | |
1116 | * at the same time the parent does it. | |
1117 | */ | |
1118 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1119 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1120 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1121 | #define set_used_math() set_stopped_child_used_math(current) | |
1122 | #define conditional_stopped_child_used_math(condition, child) \ | |
1123 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1124 | #define conditional_used_math(condition) \ | |
1125 | conditional_stopped_child_used_math(condition, current) | |
1126 | #define copy_to_stopped_child_used_math(child) \ | |
1127 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1128 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1129 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1130 | #define used_math() tsk_used_math(current) | |
1131 | ||
1132 | #ifdef CONFIG_SMP | |
36c8b586 | 1133 | extern int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask); |
1da177e4 | 1134 | #else |
36c8b586 | 1135 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1da177e4 | 1136 | { |
4098f991 | 1137 | if (!cpu_isset(0, new_mask)) |
1da177e4 LT |
1138 | return -EINVAL; |
1139 | return 0; | |
1140 | } | |
1141 | #endif | |
1142 | ||
1143 | extern unsigned long long sched_clock(void); | |
36c8b586 IM |
1144 | extern unsigned long long |
1145 | current_sched_time(const struct task_struct *current_task); | |
1da177e4 LT |
1146 | |
1147 | /* sched_exec is called by processes performing an exec */ | |
1148 | #ifdef CONFIG_SMP | |
1149 | extern void sched_exec(void); | |
1150 | #else | |
1151 | #define sched_exec() {} | |
1152 | #endif | |
1153 | ||
1154 | #ifdef CONFIG_HOTPLUG_CPU | |
1155 | extern void idle_task_exit(void); | |
1156 | #else | |
1157 | static inline void idle_task_exit(void) {} | |
1158 | #endif | |
1159 | ||
1160 | extern void sched_idle_next(void); | |
b29739f9 IM |
1161 | |
1162 | #ifdef CONFIG_RT_MUTEXES | |
36c8b586 IM |
1163 | extern int rt_mutex_getprio(struct task_struct *p); |
1164 | extern void rt_mutex_setprio(struct task_struct *p, int prio); | |
1165 | extern void rt_mutex_adjust_pi(struct task_struct *p); | |
b29739f9 | 1166 | #else |
36c8b586 | 1167 | static inline int rt_mutex_getprio(struct task_struct *p) |
b29739f9 IM |
1168 | { |
1169 | return p->normal_prio; | |
1170 | } | |
95e02ca9 | 1171 | # define rt_mutex_adjust_pi(p) do { } while (0) |
b29739f9 IM |
1172 | #endif |
1173 | ||
36c8b586 IM |
1174 | extern void set_user_nice(struct task_struct *p, long nice); |
1175 | extern int task_prio(const struct task_struct *p); | |
1176 | extern int task_nice(const struct task_struct *p); | |
1177 | extern int can_nice(const struct task_struct *p, const int nice); | |
1178 | extern int task_curr(const struct task_struct *p); | |
1da177e4 LT |
1179 | extern int idle_cpu(int cpu); |
1180 | extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); | |
36c8b586 IM |
1181 | extern struct task_struct *idle_task(int cpu); |
1182 | extern struct task_struct *curr_task(int cpu); | |
1183 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
1184 | |
1185 | void yield(void); | |
1186 | ||
1187 | /* | |
1188 | * The default (Linux) execution domain. | |
1189 | */ | |
1190 | extern struct exec_domain default_exec_domain; | |
1191 | ||
1192 | union thread_union { | |
1193 | struct thread_info thread_info; | |
1194 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
1195 | }; | |
1196 | ||
1197 | #ifndef __HAVE_ARCH_KSTACK_END | |
1198 | static inline int kstack_end(void *addr) | |
1199 | { | |
1200 | /* Reliable end of stack detection: | |
1201 | * Some APM bios versions misalign the stack | |
1202 | */ | |
1203 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
1204 | } | |
1205 | #endif | |
1206 | ||
1207 | extern union thread_union init_thread_union; | |
1208 | extern struct task_struct init_task; | |
1209 | ||
1210 | extern struct mm_struct init_mm; | |
1211 | ||
1212 | #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr) | |
1213 | extern struct task_struct *find_task_by_pid_type(int type, int pid); | |
1214 | extern void set_special_pids(pid_t session, pid_t pgrp); | |
1215 | extern void __set_special_pids(pid_t session, pid_t pgrp); | |
1216 | ||
1217 | /* per-UID process charging. */ | |
1218 | extern struct user_struct * alloc_uid(uid_t); | |
1219 | static inline struct user_struct *get_uid(struct user_struct *u) | |
1220 | { | |
1221 | atomic_inc(&u->__count); | |
1222 | return u; | |
1223 | } | |
1224 | extern void free_uid(struct user_struct *); | |
1225 | extern void switch_uid(struct user_struct *); | |
1226 | ||
1227 | #include <asm/current.h> | |
1228 | ||
3171a030 | 1229 | extern void do_timer(unsigned long ticks); |
1da177e4 LT |
1230 | |
1231 | extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); | |
1232 | extern int FASTCALL(wake_up_process(struct task_struct * tsk)); | |
1233 | extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, | |
1234 | unsigned long clone_flags)); | |
1235 | #ifdef CONFIG_SMP | |
1236 | extern void kick_process(struct task_struct *tsk); | |
1237 | #else | |
1238 | static inline void kick_process(struct task_struct *tsk) { } | |
1239 | #endif | |
36c8b586 IM |
1240 | extern void FASTCALL(sched_fork(struct task_struct * p, int clone_flags)); |
1241 | extern void FASTCALL(sched_exit(struct task_struct * p)); | |
1da177e4 LT |
1242 | |
1243 | extern int in_group_p(gid_t); | |
1244 | extern int in_egroup_p(gid_t); | |
1245 | ||
1246 | extern void proc_caches_init(void); | |
1247 | extern void flush_signals(struct task_struct *); | |
1248 | extern void flush_signal_handlers(struct task_struct *, int force_default); | |
1249 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
1250 | ||
1251 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
1252 | { | |
1253 | unsigned long flags; | |
1254 | int ret; | |
1255 | ||
1256 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
1257 | ret = dequeue_signal(tsk, mask, info); | |
1258 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
1259 | ||
1260 | return ret; | |
1261 | } | |
1262 | ||
1263 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
1264 | sigset_t *mask); | |
1265 | extern void unblock_all_signals(void); | |
1266 | extern void release_task(struct task_struct * p); | |
1267 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1268 | extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); | |
1269 | extern int force_sigsegv(int, struct task_struct *); | |
1270 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 EB |
1271 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
1272 | extern int kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); | |
1273 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); | |
2425c08b | 1274 | extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); |
c4b92fc1 EB |
1275 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
1276 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
1da177e4 LT |
1277 | extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp); |
1278 | extern int kill_pg_info(int, struct siginfo *, pid_t); | |
1279 | extern int kill_proc_info(int, struct siginfo *, pid_t); | |
1280 | extern void do_notify_parent(struct task_struct *, int); | |
1281 | extern void force_sig(int, struct task_struct *); | |
1282 | extern void force_sig_specific(int, struct task_struct *); | |
1283 | extern int send_sig(int, struct task_struct *, int); | |
1284 | extern void zap_other_threads(struct task_struct *p); | |
1285 | extern int kill_pg(pid_t, int, int); | |
1da177e4 LT |
1286 | extern int kill_proc(pid_t, int, int); |
1287 | extern struct sigqueue *sigqueue_alloc(void); | |
1288 | extern void sigqueue_free(struct sigqueue *); | |
1289 | extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); | |
1290 | extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); | |
9ac95f2f | 1291 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 LT |
1292 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
1293 | ||
1294 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ | |
1295 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
1296 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
1297 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
1298 | ||
621d3121 ON |
1299 | static inline int is_si_special(const struct siginfo *info) |
1300 | { | |
1301 | return info <= SEND_SIG_FORCED; | |
1302 | } | |
1303 | ||
1da177e4 LT |
1304 | /* True if we are on the alternate signal stack. */ |
1305 | ||
1306 | static inline int on_sig_stack(unsigned long sp) | |
1307 | { | |
1308 | return (sp - current->sas_ss_sp < current->sas_ss_size); | |
1309 | } | |
1310 | ||
1311 | static inline int sas_ss_flags(unsigned long sp) | |
1312 | { | |
1313 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
1314 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
1315 | } | |
1316 | ||
1da177e4 LT |
1317 | /* |
1318 | * Routines for handling mm_structs | |
1319 | */ | |
1320 | extern struct mm_struct * mm_alloc(void); | |
1321 | ||
1322 | /* mmdrop drops the mm and the page tables */ | |
1323 | extern void FASTCALL(__mmdrop(struct mm_struct *)); | |
1324 | static inline void mmdrop(struct mm_struct * mm) | |
1325 | { | |
1326 | if (atomic_dec_and_test(&mm->mm_count)) | |
1327 | __mmdrop(mm); | |
1328 | } | |
1329 | ||
1330 | /* mmput gets rid of the mappings and all user-space */ | |
1331 | extern void mmput(struct mm_struct *); | |
1332 | /* Grab a reference to a task's mm, if it is not already going away */ | |
1333 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
1334 | /* Remove the current tasks stale references to the old mm_struct */ | |
1335 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
1336 | ||
1337 | extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); | |
1338 | extern void flush_thread(void); | |
1339 | extern void exit_thread(void); | |
1340 | ||
1da177e4 | 1341 | extern void exit_files(struct task_struct *); |
6b3934ef | 1342 | extern void __cleanup_signal(struct signal_struct *); |
a7e5328a | 1343 | extern void __cleanup_sighand(struct sighand_struct *); |
1da177e4 LT |
1344 | extern void exit_itimers(struct signal_struct *); |
1345 | ||
1346 | extern NORET_TYPE void do_group_exit(int); | |
1347 | ||
1da177e4 LT |
1348 | extern void daemonize(const char *, ...); |
1349 | extern int allow_signal(int); | |
1350 | extern int disallow_signal(int); | |
36c8b586 | 1351 | extern struct task_struct *child_reaper; |
1da177e4 LT |
1352 | |
1353 | extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); | |
1354 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); | |
36c8b586 | 1355 | struct task_struct *fork_idle(int); |
1da177e4 LT |
1356 | |
1357 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
1358 | extern void get_task_comm(char *to, struct task_struct *tsk); | |
1359 | ||
1360 | #ifdef CONFIG_SMP | |
36c8b586 | 1361 | extern void wait_task_inactive(struct task_struct * p); |
1da177e4 LT |
1362 | #else |
1363 | #define wait_task_inactive(p) do { } while (0) | |
1364 | #endif | |
1365 | ||
1366 | #define remove_parent(p) list_del_init(&(p)->sibling) | |
8fafabd8 | 1367 | #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children) |
1da177e4 | 1368 | |
5e85d4ab | 1369 | #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) |
1da177e4 LT |
1370 | |
1371 | #define for_each_process(p) \ | |
1372 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
1373 | ||
1374 | /* | |
1375 | * Careful: do_each_thread/while_each_thread is a double loop so | |
1376 | * 'break' will not work as expected - use goto instead. | |
1377 | */ | |
1378 | #define do_each_thread(g, t) \ | |
1379 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
1380 | ||
1381 | #define while_each_thread(g, t) \ | |
1382 | while ((t = next_thread(t)) != g) | |
1383 | ||
de12a787 EB |
1384 | /* de_thread depends on thread_group_leader not being a pid based check */ |
1385 | #define thread_group_leader(p) (p == p->group_leader) | |
1da177e4 | 1386 | |
0804ef4b EB |
1387 | /* Do to the insanities of de_thread it is possible for a process |
1388 | * to have the pid of the thread group leader without actually being | |
1389 | * the thread group leader. For iteration through the pids in proc | |
1390 | * all we care about is that we have a task with the appropriate | |
1391 | * pid, we don't actually care if we have the right task. | |
1392 | */ | |
1393 | static inline int has_group_leader_pid(struct task_struct *p) | |
1394 | { | |
1395 | return p->pid == p->tgid; | |
1396 | } | |
1397 | ||
36c8b586 | 1398 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 ON |
1399 | { |
1400 | return list_entry(rcu_dereference(p->thread_group.next), | |
36c8b586 | 1401 | struct task_struct, thread_group); |
47e65328 ON |
1402 | } |
1403 | ||
36c8b586 | 1404 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 1405 | { |
47e65328 | 1406 | return list_empty(&p->thread_group); |
1da177e4 LT |
1407 | } |
1408 | ||
1409 | #define delay_group_leader(p) \ | |
1410 | (thread_group_leader(p) && !thread_group_empty(p)) | |
1411 | ||
1da177e4 | 1412 | /* |
260ea101 | 1413 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 1414 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
053199ed | 1415 | * pins the final release of task.io_context. Also protects ->cpuset. |
1da177e4 LT |
1416 | * |
1417 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
1418 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
1419 | * neither inside nor outside. | |
1420 | */ | |
1421 | static inline void task_lock(struct task_struct *p) | |
1422 | { | |
1423 | spin_lock(&p->alloc_lock); | |
1424 | } | |
1425 | ||
1426 | static inline void task_unlock(struct task_struct *p) | |
1427 | { | |
1428 | spin_unlock(&p->alloc_lock); | |
1429 | } | |
1430 | ||
f63ee72e ON |
1431 | extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
1432 | unsigned long *flags); | |
1433 | ||
1434 | static inline void unlock_task_sighand(struct task_struct *tsk, | |
1435 | unsigned long *flags) | |
1436 | { | |
1437 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
1438 | } | |
1439 | ||
f037360f AV |
1440 | #ifndef __HAVE_THREAD_FUNCTIONS |
1441 | ||
a1261f54 | 1442 | #define task_thread_info(task) (task)->thread_info |
9fc65876 | 1443 | #define task_stack_page(task) ((void*)((task)->thread_info)) |
a1261f54 | 1444 | |
10ebffde AV |
1445 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
1446 | { | |
1447 | *task_thread_info(p) = *task_thread_info(org); | |
1448 | task_thread_info(p)->task = p; | |
1449 | } | |
1450 | ||
1451 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
1452 | { | |
1453 | return (unsigned long *)(p->thread_info + 1); | |
1454 | } | |
1455 | ||
f037360f AV |
1456 | #endif |
1457 | ||
1da177e4 LT |
1458 | /* set thread flags in other task's structures |
1459 | * - see asm/thread_info.h for TIF_xxxx flags available | |
1460 | */ | |
1461 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1462 | { | |
a1261f54 | 1463 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1464 | } |
1465 | ||
1466 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1467 | { | |
a1261f54 | 1468 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1469 | } |
1470 | ||
1471 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1472 | { | |
a1261f54 | 1473 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1477 | { | |
a1261f54 | 1478 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1479 | } |
1480 | ||
1481 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1482 | { | |
a1261f54 | 1483 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1484 | } |
1485 | ||
1486 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1487 | { | |
1488 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1489 | } | |
1490 | ||
1491 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1492 | { | |
1493 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1494 | } | |
1495 | ||
1496 | static inline int signal_pending(struct task_struct *p) | |
1497 | { | |
1498 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
1499 | } | |
1500 | ||
1501 | static inline int need_resched(void) | |
1502 | { | |
1503 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); | |
1504 | } | |
1505 | ||
1506 | /* | |
1507 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1508 | * explicit rescheduling in places that are safe. The return | |
1509 | * value indicates whether a reschedule was done in fact. | |
1510 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1511 | * cond_resched_softirq() will enable bhs before scheduling. | |
1512 | */ | |
1513 | extern int cond_resched(void); | |
1514 | extern int cond_resched_lock(spinlock_t * lock); | |
1515 | extern int cond_resched_softirq(void); | |
1516 | ||
1517 | /* | |
1518 | * Does a critical section need to be broken due to another | |
1519 | * task waiting?: | |
1520 | */ | |
1521 | #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) | |
1522 | # define need_lockbreak(lock) ((lock)->break_lock) | |
1523 | #else | |
1524 | # define need_lockbreak(lock) 0 | |
1525 | #endif | |
1526 | ||
1527 | /* | |
1528 | * Does a critical section need to be broken due to another | |
1529 | * task waiting or preemption being signalled: | |
1530 | */ | |
1531 | static inline int lock_need_resched(spinlock_t *lock) | |
1532 | { | |
1533 | if (need_lockbreak(lock) || need_resched()) | |
1534 | return 1; | |
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | /* Reevaluate whether the task has signals pending delivery. | |
1539 | This is required every time the blocked sigset_t changes. | |
1540 | callers must hold sighand->siglock. */ | |
1541 | ||
1542 | extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t)); | |
1543 | extern void recalc_sigpending(void); | |
1544 | ||
1545 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
1546 | ||
1547 | /* | |
1548 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
1549 | */ | |
1550 | #ifdef CONFIG_SMP | |
1551 | ||
1552 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1553 | { | |
a1261f54 | 1554 | return task_thread_info(p)->cpu; |
1da177e4 LT |
1555 | } |
1556 | ||
1557 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1558 | { | |
a1261f54 | 1559 | task_thread_info(p)->cpu = cpu; |
1da177e4 LT |
1560 | } |
1561 | ||
1562 | #else | |
1563 | ||
1564 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1565 | { | |
1566 | return 0; | |
1567 | } | |
1568 | ||
1569 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1570 | { | |
1571 | } | |
1572 | ||
1573 | #endif /* CONFIG_SMP */ | |
1574 | ||
1575 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1576 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1577 | #else | |
1578 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) | |
1579 | { | |
1580 | mm->mmap_base = TASK_UNMAPPED_BASE; | |
1581 | mm->get_unmapped_area = arch_get_unmapped_area; | |
1582 | mm->unmap_area = arch_unmap_area; | |
1583 | } | |
1584 | #endif | |
1585 | ||
1586 | extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); | |
1587 | extern long sched_getaffinity(pid_t pid, cpumask_t *mask); | |
1588 | ||
5c45bf27 SS |
1589 | #include <linux/sysdev.h> |
1590 | extern int sched_mc_power_savings, sched_smt_power_savings; | |
1591 | extern struct sysdev_attribute attr_sched_mc_power_savings, attr_sched_smt_power_savings; | |
1592 | extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls); | |
1593 | ||
1da177e4 LT |
1594 | extern void normalize_rt_tasks(void); |
1595 | ||
1da177e4 | 1596 | #ifdef CONFIG_PM |
3e1d1d28 CL |
1597 | /* |
1598 | * Check if a process has been frozen | |
1599 | */ | |
1600 | static inline int frozen(struct task_struct *p) | |
1601 | { | |
1602 | return p->flags & PF_FROZEN; | |
1603 | } | |
1604 | ||
1605 | /* | |
1606 | * Check if there is a request to freeze a process | |
1607 | */ | |
1608 | static inline int freezing(struct task_struct *p) | |
1609 | { | |
1610 | return p->flags & PF_FREEZE; | |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * Request that a process be frozen | |
1615 | * FIXME: SMP problem. We may not modify other process' flags! | |
1616 | */ | |
1617 | static inline void freeze(struct task_struct *p) | |
1618 | { | |
1619 | p->flags |= PF_FREEZE; | |
1620 | } | |
1621 | ||
a7ef7878 RW |
1622 | /* |
1623 | * Sometimes we may need to cancel the previous 'freeze' request | |
1624 | */ | |
1625 | static inline void do_not_freeze(struct task_struct *p) | |
1626 | { | |
1627 | p->flags &= ~PF_FREEZE; | |
1628 | } | |
1629 | ||
3e1d1d28 CL |
1630 | /* |
1631 | * Wake up a frozen process | |
1632 | */ | |
1633 | static inline int thaw_process(struct task_struct *p) | |
1634 | { | |
1635 | if (frozen(p)) { | |
1636 | p->flags &= ~PF_FROZEN; | |
1637 | wake_up_process(p); | |
1638 | return 1; | |
1639 | } | |
1640 | return 0; | |
1641 | } | |
1642 | ||
1643 | /* | |
1644 | * freezing is complete, mark process as frozen | |
1645 | */ | |
1646 | static inline void frozen_process(struct task_struct *p) | |
1647 | { | |
1648 | p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN; | |
1649 | } | |
1650 | ||
1651 | extern void refrigerator(void); | |
1da177e4 LT |
1652 | extern int freeze_processes(void); |
1653 | extern void thaw_processes(void); | |
1654 | ||
3e1d1d28 | 1655 | static inline int try_to_freeze(void) |
1da177e4 | 1656 | { |
3e1d1d28 CL |
1657 | if (freezing(current)) { |
1658 | refrigerator(); | |
1da177e4 LT |
1659 | return 1; |
1660 | } else | |
1661 | return 0; | |
1662 | } | |
1663 | #else | |
3e1d1d28 CL |
1664 | static inline int frozen(struct task_struct *p) { return 0; } |
1665 | static inline int freezing(struct task_struct *p) { return 0; } | |
1666 | static inline void freeze(struct task_struct *p) { BUG(); } | |
1667 | static inline int thaw_process(struct task_struct *p) { return 1; } | |
1668 | static inline void frozen_process(struct task_struct *p) { BUG(); } | |
1669 | ||
1670 | static inline void refrigerator(void) {} | |
1da177e4 LT |
1671 | static inline int freeze_processes(void) { BUG(); return 0; } |
1672 | static inline void thaw_processes(void) {} | |
1673 | ||
3e1d1d28 CL |
1674 | static inline int try_to_freeze(void) { return 0; } |
1675 | ||
1da177e4 LT |
1676 | #endif /* CONFIG_PM */ |
1677 | #endif /* __KERNEL__ */ | |
1678 | ||
1679 | #endif |