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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 | ||
36d57ac4 L |
38 | #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */ |
39 | ||
1da177e4 LT |
40 | struct exec_domain; |
41 | ||
42 | /* | |
43 | * cloning flags: | |
44 | */ | |
45 | #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ | |
46 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ | |
47 | #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ | |
48 | #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ | |
49 | #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ | |
50 | #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ | |
51 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ | |
52 | #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ | |
53 | #define CLONE_THREAD 0x00010000 /* Same thread group? */ | |
54 | #define CLONE_NEWNS 0x00020000 /* New namespace group? */ | |
55 | #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ | |
56 | #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ | |
57 | #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ | |
58 | #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ | |
59 | #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ | |
60 | #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ | |
61 | #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ | |
62 | #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ | |
63 | ||
64 | /* | |
65 | * List of flags we want to share for kernel threads, | |
66 | * if only because they are not used by them anyway. | |
67 | */ | |
68 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
69 | ||
70 | /* | |
71 | * These are the constant used to fake the fixed-point load-average | |
72 | * counting. Some notes: | |
73 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
74 | * a load-average precision of 10 bits integer + 11 bits fractional | |
75 | * - if you want to count load-averages more often, you need more | |
76 | * precision, or rounding will get you. With 2-second counting freq, | |
77 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
78 | * 11 bit fractions. | |
79 | */ | |
80 | extern unsigned long avenrun[]; /* Load averages */ | |
81 | ||
82 | #define FSHIFT 11 /* nr of bits of precision */ | |
83 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
84 | #define LOAD_FREQ (5*HZ) /* 5 sec intervals */ | |
85 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ | |
86 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
87 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
88 | ||
89 | #define CALC_LOAD(load,exp,n) \ | |
90 | load *= exp; \ | |
91 | load += n*(FIXED_1-exp); \ | |
92 | load >>= FSHIFT; | |
93 | ||
94 | extern unsigned long total_forks; | |
95 | extern int nr_threads; | |
96 | extern int last_pid; | |
97 | DECLARE_PER_CPU(unsigned long, process_counts); | |
98 | extern int nr_processes(void); | |
99 | extern unsigned long nr_running(void); | |
100 | extern unsigned long nr_uninterruptible(void); | |
101 | extern unsigned long nr_iowait(void); | |
102 | ||
103 | #include <linux/time.h> | |
104 | #include <linux/param.h> | |
105 | #include <linux/resource.h> | |
106 | #include <linux/timer.h> | |
107 | ||
108 | #include <asm/processor.h> | |
109 | ||
4a8342d2 LT |
110 | /* |
111 | * Task state bitmask. NOTE! These bits are also | |
112 | * encoded in fs/proc/array.c: get_task_state(). | |
113 | * | |
114 | * We have two separate sets of flags: task->state | |
115 | * is about runnability, while task->exit_state are | |
116 | * about the task exiting. Confusing, but this way | |
117 | * modifying one set can't modify the other one by | |
118 | * mistake. | |
119 | */ | |
1da177e4 LT |
120 | #define TASK_RUNNING 0 |
121 | #define TASK_INTERRUPTIBLE 1 | |
122 | #define TASK_UNINTERRUPTIBLE 2 | |
4a8342d2 LT |
123 | #define TASK_STOPPED 4 |
124 | #define TASK_TRACED 8 | |
125 | /* in tsk->exit_state */ | |
126 | #define EXIT_ZOMBIE 16 | |
127 | #define EXIT_DEAD 32 | |
128 | /* in tsk->state again */ | |
129 | #define TASK_NONINTERACTIVE 64 | |
1da177e4 LT |
130 | |
131 | #define __set_task_state(tsk, state_value) \ | |
132 | do { (tsk)->state = (state_value); } while (0) | |
133 | #define set_task_state(tsk, state_value) \ | |
134 | set_mb((tsk)->state, (state_value)) | |
135 | ||
498d0c57 AM |
136 | /* |
137 | * set_current_state() includes a barrier so that the write of current->state | |
138 | * is correctly serialised wrt the caller's subsequent test of whether to | |
139 | * actually sleep: | |
140 | * | |
141 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
142 | * if (do_i_need_to_sleep()) | |
143 | * schedule(); | |
144 | * | |
145 | * If the caller does not need such serialisation then use __set_current_state() | |
146 | */ | |
1da177e4 LT |
147 | #define __set_current_state(state_value) \ |
148 | do { current->state = (state_value); } while (0) | |
149 | #define set_current_state(state_value) \ | |
150 | set_mb(current->state, (state_value)) | |
151 | ||
152 | /* Task command name length */ | |
153 | #define TASK_COMM_LEN 16 | |
154 | ||
155 | /* | |
156 | * Scheduling policies | |
157 | */ | |
158 | #define SCHED_NORMAL 0 | |
159 | #define SCHED_FIFO 1 | |
160 | #define SCHED_RR 2 | |
161 | ||
162 | struct sched_param { | |
163 | int sched_priority; | |
164 | }; | |
165 | ||
166 | #ifdef __KERNEL__ | |
167 | ||
168 | #include <linux/spinlock.h> | |
169 | ||
170 | /* | |
171 | * This serializes "schedule()" and also protects | |
172 | * the run-queue from deletions/modifications (but | |
173 | * _adding_ to the beginning of the run-queue has | |
174 | * a separate lock). | |
175 | */ | |
176 | extern rwlock_t tasklist_lock; | |
177 | extern spinlock_t mmlist_lock; | |
178 | ||
179 | typedef struct task_struct task_t; | |
180 | ||
181 | extern void sched_init(void); | |
182 | extern void sched_init_smp(void); | |
183 | extern void init_idle(task_t *idle, int cpu); | |
184 | ||
185 | extern cpumask_t nohz_cpu_mask; | |
186 | ||
187 | extern void show_state(void); | |
188 | extern void show_regs(struct pt_regs *); | |
189 | ||
190 | /* | |
191 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
192 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
193 | * trace (or NULL if the entire call-chain of the task should be shown). | |
194 | */ | |
195 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
196 | ||
197 | void io_schedule(void); | |
198 | long io_schedule_timeout(long timeout); | |
199 | ||
200 | extern void cpu_init (void); | |
201 | extern void trap_init(void); | |
202 | extern void update_process_times(int user); | |
203 | extern void scheduler_tick(void); | |
204 | ||
8446f1d3 IM |
205 | #ifdef CONFIG_DETECT_SOFTLOCKUP |
206 | extern void softlockup_tick(struct pt_regs *regs); | |
207 | extern void spawn_softlockup_task(void); | |
208 | extern void touch_softlockup_watchdog(void); | |
209 | #else | |
210 | static inline void softlockup_tick(struct pt_regs *regs) | |
211 | { | |
212 | } | |
213 | static inline void spawn_softlockup_task(void) | |
214 | { | |
215 | } | |
216 | static inline void touch_softlockup_watchdog(void) | |
217 | { | |
218 | } | |
219 | #endif | |
220 | ||
221 | ||
1da177e4 LT |
222 | /* Attach to any functions which should be ignored in wchan output. */ |
223 | #define __sched __attribute__((__section__(".sched.text"))) | |
224 | /* Is this address in the __sched functions? */ | |
225 | extern int in_sched_functions(unsigned long addr); | |
226 | ||
227 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
228 | extern signed long FASTCALL(schedule_timeout(signed long timeout)); | |
64ed93a2 NA |
229 | extern signed long schedule_timeout_interruptible(signed long timeout); |
230 | extern signed long schedule_timeout_uninterruptible(signed long timeout); | |
1da177e4 LT |
231 | asmlinkage void schedule(void); |
232 | ||
233 | struct namespace; | |
234 | ||
235 | /* Maximum number of active map areas.. This is a random (large) number */ | |
236 | #define DEFAULT_MAX_MAP_COUNT 65536 | |
237 | ||
238 | extern int sysctl_max_map_count; | |
239 | ||
240 | #include <linux/aio.h> | |
241 | ||
242 | extern unsigned long | |
243 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
244 | unsigned long, unsigned long); | |
245 | extern unsigned long | |
246 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
247 | unsigned long len, unsigned long pgoff, | |
248 | unsigned long flags); | |
1363c3cd WW |
249 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
250 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
1da177e4 | 251 | |
f412ac08 HD |
252 | #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS |
253 | /* | |
254 | * The mm counters are not protected by its page_table_lock, | |
255 | * so must be incremented atomically. | |
256 | */ | |
257 | #ifdef ATOMIC64_INIT | |
258 | #define set_mm_counter(mm, member, value) atomic64_set(&(mm)->_##member, value) | |
259 | #define get_mm_counter(mm, member) ((unsigned long)atomic64_read(&(mm)->_##member)) | |
260 | #define add_mm_counter(mm, member, value) atomic64_add(value, &(mm)->_##member) | |
261 | #define inc_mm_counter(mm, member) atomic64_inc(&(mm)->_##member) | |
262 | #define dec_mm_counter(mm, member) atomic64_dec(&(mm)->_##member) | |
263 | typedef atomic64_t mm_counter_t; | |
264 | #else /* !ATOMIC64_INIT */ | |
265 | /* | |
266 | * The counters wrap back to 0 at 2^32 * PAGE_SIZE, | |
267 | * that is, at 16TB if using 4kB page size. | |
268 | */ | |
269 | #define set_mm_counter(mm, member, value) atomic_set(&(mm)->_##member, value) | |
270 | #define get_mm_counter(mm, member) ((unsigned long)atomic_read(&(mm)->_##member)) | |
271 | #define add_mm_counter(mm, member, value) atomic_add(value, &(mm)->_##member) | |
272 | #define inc_mm_counter(mm, member) atomic_inc(&(mm)->_##member) | |
273 | #define dec_mm_counter(mm, member) atomic_dec(&(mm)->_##member) | |
274 | typedef atomic_t mm_counter_t; | |
275 | #endif /* !ATOMIC64_INIT */ | |
276 | ||
277 | #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ | |
278 | /* | |
279 | * The mm counters are protected by its page_table_lock, | |
280 | * so can be incremented directly. | |
281 | */ | |
1da177e4 LT |
282 | #define set_mm_counter(mm, member, value) (mm)->_##member = (value) |
283 | #define get_mm_counter(mm, member) ((mm)->_##member) | |
284 | #define add_mm_counter(mm, member, value) (mm)->_##member += (value) | |
285 | #define inc_mm_counter(mm, member) (mm)->_##member++ | |
286 | #define dec_mm_counter(mm, member) (mm)->_##member-- | |
f412ac08 HD |
287 | typedef unsigned long mm_counter_t; |
288 | ||
289 | #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ | |
4294621f | 290 | |
f412ac08 HD |
291 | #define get_mm_rss(mm) \ |
292 | (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) | |
365e9c87 HD |
293 | #define update_hiwater_rss(mm) do { \ |
294 | unsigned long _rss = get_mm_rss(mm); \ | |
295 | if ((mm)->hiwater_rss < _rss) \ | |
296 | (mm)->hiwater_rss = _rss; \ | |
297 | } while (0) | |
298 | #define update_hiwater_vm(mm) do { \ | |
299 | if ((mm)->hiwater_vm < (mm)->total_vm) \ | |
300 | (mm)->hiwater_vm = (mm)->total_vm; \ | |
301 | } while (0) | |
302 | ||
1da177e4 LT |
303 | struct mm_struct { |
304 | struct vm_area_struct * mmap; /* list of VMAs */ | |
305 | struct rb_root mm_rb; | |
306 | struct vm_area_struct * mmap_cache; /* last find_vma result */ | |
307 | unsigned long (*get_unmapped_area) (struct file *filp, | |
308 | unsigned long addr, unsigned long len, | |
309 | unsigned long pgoff, unsigned long flags); | |
1363c3cd WW |
310 | void (*unmap_area) (struct mm_struct *mm, unsigned long addr); |
311 | unsigned long mmap_base; /* base of mmap area */ | |
312 | unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ | |
313 | unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ | |
1da177e4 LT |
314 | pgd_t * pgd; |
315 | atomic_t mm_users; /* How many users with user space? */ | |
316 | atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ | |
317 | int map_count; /* number of VMAs */ | |
318 | struct rw_semaphore mmap_sem; | |
319 | spinlock_t page_table_lock; /* Protects page tables and some counters */ | |
320 | ||
321 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung | |
322 | * together off init_mm.mmlist, and are protected | |
323 | * by mmlist_lock | |
324 | */ | |
325 | ||
f412ac08 HD |
326 | /* Special counters, in some configurations protected by the |
327 | * page_table_lock, in other configurations by being atomic. | |
328 | */ | |
4294621f | 329 | mm_counter_t _file_rss; |
1da177e4 LT |
330 | mm_counter_t _anon_rss; |
331 | ||
f449952b HD |
332 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ |
333 | unsigned long hiwater_vm; /* High-water virtual memory usage */ | |
334 | ||
335 | unsigned long total_vm, locked_vm, shared_vm, exec_vm; | |
336 | unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; | |
337 | unsigned long start_code, end_code, start_data, end_data; | |
338 | unsigned long start_brk, brk, start_stack; | |
339 | unsigned long arg_start, arg_end, env_start, env_end; | |
340 | ||
36d57ac4 | 341 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ |
1da177e4 | 342 | |
d6e71144 | 343 | unsigned dumpable:2; |
1da177e4 LT |
344 | cpumask_t cpu_vm_mask; |
345 | ||
346 | /* Architecture-specific MM context */ | |
347 | mm_context_t context; | |
348 | ||
349 | /* Token based thrashing protection. */ | |
350 | unsigned long swap_token_time; | |
351 | char recent_pagein; | |
352 | ||
353 | /* coredumping support */ | |
354 | int core_waiters; | |
355 | struct completion *core_startup_done, core_done; | |
356 | ||
357 | /* aio bits */ | |
358 | rwlock_t ioctx_list_lock; | |
359 | struct kioctx *ioctx_list; | |
1da177e4 | 360 | struct kioctx default_kioctx; |
1da177e4 LT |
361 | }; |
362 | ||
363 | struct sighand_struct { | |
364 | atomic_t count; | |
365 | struct k_sigaction action[_NSIG]; | |
366 | spinlock_t siglock; | |
367 | }; | |
368 | ||
369 | /* | |
370 | * NOTE! "signal_struct" does not have it's own | |
371 | * locking, because a shared signal_struct always | |
372 | * implies a shared sighand_struct, so locking | |
373 | * sighand_struct is always a proper superset of | |
374 | * the locking of signal_struct. | |
375 | */ | |
376 | struct signal_struct { | |
377 | atomic_t count; | |
378 | atomic_t live; | |
379 | ||
380 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
381 | ||
382 | /* current thread group signal load-balancing target: */ | |
383 | task_t *curr_target; | |
384 | ||
385 | /* shared signal handling: */ | |
386 | struct sigpending shared_pending; | |
387 | ||
388 | /* thread group exit support */ | |
389 | int group_exit_code; | |
390 | /* overloaded: | |
391 | * - notify group_exit_task when ->count is equal to notify_count | |
392 | * - everyone except group_exit_task is stopped during signal delivery | |
393 | * of fatal signals, group_exit_task processes the signal. | |
394 | */ | |
395 | struct task_struct *group_exit_task; | |
396 | int notify_count; | |
397 | ||
398 | /* thread group stop support, overloads group_exit_code too */ | |
399 | int group_stop_count; | |
400 | unsigned int flags; /* see SIGNAL_* flags below */ | |
401 | ||
402 | /* POSIX.1b Interval Timers */ | |
403 | struct list_head posix_timers; | |
404 | ||
405 | /* ITIMER_REAL timer for the process */ | |
406 | struct timer_list real_timer; | |
407 | unsigned long it_real_value, it_real_incr; | |
408 | ||
409 | /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ | |
410 | cputime_t it_prof_expires, it_virt_expires; | |
411 | cputime_t it_prof_incr, it_virt_incr; | |
412 | ||
413 | /* job control IDs */ | |
414 | pid_t pgrp; | |
415 | pid_t tty_old_pgrp; | |
416 | pid_t session; | |
417 | /* boolean value for session group leader */ | |
418 | int leader; | |
419 | ||
420 | struct tty_struct *tty; /* NULL if no tty */ | |
421 | ||
422 | /* | |
423 | * Cumulative resource counters for dead threads in the group, | |
424 | * and for reaped dead child processes forked by this group. | |
425 | * Live threads maintain their own counters and add to these | |
426 | * in __exit_signal, except for the group leader. | |
427 | */ | |
428 | cputime_t utime, stime, cutime, cstime; | |
429 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; | |
430 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
431 | ||
432 | /* | |
433 | * Cumulative ns of scheduled CPU time for dead threads in the | |
434 | * group, not including a zombie group leader. (This only differs | |
435 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
436 | * other than jiffies.) | |
437 | */ | |
438 | unsigned long long sched_time; | |
439 | ||
440 | /* | |
441 | * We don't bother to synchronize most readers of this at all, | |
442 | * because there is no reader checking a limit that actually needs | |
443 | * to get both rlim_cur and rlim_max atomically, and either one | |
444 | * alone is a single word that can safely be read normally. | |
445 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
446 | * protect this instead of the siglock, because they really | |
447 | * have no need to disable irqs. | |
448 | */ | |
449 | struct rlimit rlim[RLIM_NLIMITS]; | |
450 | ||
451 | struct list_head cpu_timers[3]; | |
452 | ||
453 | /* keep the process-shared keyrings here so that they do the right | |
454 | * thing in threads created with CLONE_THREAD */ | |
455 | #ifdef CONFIG_KEYS | |
456 | struct key *session_keyring; /* keyring inherited over fork */ | |
457 | struct key *process_keyring; /* keyring private to this process */ | |
458 | #endif | |
459 | }; | |
460 | ||
4866cde0 NP |
461 | /* Context switch must be unlocked if interrupts are to be enabled */ |
462 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW | |
463 | # define __ARCH_WANT_UNLOCKED_CTXSW | |
464 | #endif | |
465 | ||
1da177e4 LT |
466 | /* |
467 | * Bits in flags field of signal_struct. | |
468 | */ | |
469 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
470 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ | |
471 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ | |
472 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ | |
473 | ||
474 | ||
475 | /* | |
476 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
477 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are | |
478 | * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values | |
479 | * are inverted: lower p->prio value means higher priority. | |
480 | * | |
481 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
482 | * RT priority to be separate from the value exported to | |
483 | * user-space. This allows kernel threads to set their | |
484 | * priority to a value higher than any user task. Note: | |
485 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
486 | */ | |
487 | ||
488 | #define MAX_USER_RT_PRIO 100 | |
489 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
490 | ||
491 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
492 | ||
493 | #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO)) | |
494 | ||
495 | /* | |
496 | * Some day this will be a full-fledged user tracking system.. | |
497 | */ | |
498 | struct user_struct { | |
499 | atomic_t __count; /* reference count */ | |
500 | atomic_t processes; /* How many processes does this user have? */ | |
501 | atomic_t files; /* How many open files does this user have? */ | |
502 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
0eeca283 RL |
503 | #ifdef CONFIG_INOTIFY |
504 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ | |
505 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
506 | #endif | |
1da177e4 LT |
507 | /* protected by mq_lock */ |
508 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
509 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ | |
510 | ||
511 | #ifdef CONFIG_KEYS | |
512 | struct key *uid_keyring; /* UID specific keyring */ | |
513 | struct key *session_keyring; /* UID's default session keyring */ | |
514 | #endif | |
515 | ||
516 | /* Hash table maintenance information */ | |
517 | struct list_head uidhash_list; | |
518 | uid_t uid; | |
519 | }; | |
520 | ||
521 | extern struct user_struct *find_user(uid_t); | |
522 | ||
523 | extern struct user_struct root_user; | |
524 | #define INIT_USER (&root_user) | |
525 | ||
526 | typedef struct prio_array prio_array_t; | |
527 | struct backing_dev_info; | |
528 | struct reclaim_state; | |
529 | ||
530 | #ifdef CONFIG_SCHEDSTATS | |
531 | struct sched_info { | |
532 | /* cumulative counters */ | |
533 | unsigned long cpu_time, /* time spent on the cpu */ | |
534 | run_delay, /* time spent waiting on a runqueue */ | |
535 | pcnt; /* # of timeslices run on this cpu */ | |
536 | ||
537 | /* timestamps */ | |
538 | unsigned long last_arrival, /* when we last ran on a cpu */ | |
539 | last_queued; /* when we were last queued to run */ | |
540 | }; | |
541 | ||
542 | extern struct file_operations proc_schedstat_operations; | |
543 | #endif | |
544 | ||
545 | enum idle_type | |
546 | { | |
547 | SCHED_IDLE, | |
548 | NOT_IDLE, | |
549 | NEWLY_IDLE, | |
550 | MAX_IDLE_TYPES | |
551 | }; | |
552 | ||
553 | /* | |
554 | * sched-domains (multiprocessor balancing) declarations: | |
555 | */ | |
556 | #ifdef CONFIG_SMP | |
557 | #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */ | |
558 | ||
559 | #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ | |
560 | #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ | |
561 | #define SD_BALANCE_EXEC 4 /* Balance on exec */ | |
147cbb4b NP |
562 | #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ |
563 | #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ | |
564 | #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ | |
565 | #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ | |
566 | #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ | |
1da177e4 LT |
567 | |
568 | struct sched_group { | |
569 | struct sched_group *next; /* Must be a circular list */ | |
570 | cpumask_t cpumask; | |
571 | ||
572 | /* | |
573 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
574 | * single CPU. This is read only (except for setup, hotplug CPU). | |
575 | */ | |
576 | unsigned long cpu_power; | |
577 | }; | |
578 | ||
579 | struct sched_domain { | |
580 | /* These fields must be setup */ | |
581 | struct sched_domain *parent; /* top domain must be null terminated */ | |
582 | struct sched_group *groups; /* the balancing groups of the domain */ | |
583 | cpumask_t span; /* span of all CPUs in this domain */ | |
584 | unsigned long min_interval; /* Minimum balance interval ms */ | |
585 | unsigned long max_interval; /* Maximum balance interval ms */ | |
586 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
587 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
588 | unsigned long long cache_hot_time; /* Task considered cache hot (ns) */ | |
589 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ | |
590 | unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */ | |
7897986b NP |
591 | unsigned int busy_idx; |
592 | unsigned int idle_idx; | |
593 | unsigned int newidle_idx; | |
594 | unsigned int wake_idx; | |
147cbb4b | 595 | unsigned int forkexec_idx; |
1da177e4 LT |
596 | int flags; /* See SD_* */ |
597 | ||
598 | /* Runtime fields. */ | |
599 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
600 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
601 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
602 | ||
603 | #ifdef CONFIG_SCHEDSTATS | |
604 | /* load_balance() stats */ | |
605 | unsigned long lb_cnt[MAX_IDLE_TYPES]; | |
606 | unsigned long lb_failed[MAX_IDLE_TYPES]; | |
607 | unsigned long lb_balanced[MAX_IDLE_TYPES]; | |
608 | unsigned long lb_imbalance[MAX_IDLE_TYPES]; | |
609 | unsigned long lb_gained[MAX_IDLE_TYPES]; | |
610 | unsigned long lb_hot_gained[MAX_IDLE_TYPES]; | |
611 | unsigned long lb_nobusyg[MAX_IDLE_TYPES]; | |
612 | unsigned long lb_nobusyq[MAX_IDLE_TYPES]; | |
613 | ||
614 | /* Active load balancing */ | |
615 | unsigned long alb_cnt; | |
616 | unsigned long alb_failed; | |
617 | unsigned long alb_pushed; | |
618 | ||
68767a0a NP |
619 | /* SD_BALANCE_EXEC stats */ |
620 | unsigned long sbe_cnt; | |
621 | unsigned long sbe_balanced; | |
1da177e4 LT |
622 | unsigned long sbe_pushed; |
623 | ||
68767a0a NP |
624 | /* SD_BALANCE_FORK stats */ |
625 | unsigned long sbf_cnt; | |
626 | unsigned long sbf_balanced; | |
627 | unsigned long sbf_pushed; | |
628 | ||
1da177e4 LT |
629 | /* try_to_wake_up() stats */ |
630 | unsigned long ttwu_wake_remote; | |
631 | unsigned long ttwu_move_affine; | |
632 | unsigned long ttwu_move_balance; | |
633 | #endif | |
634 | }; | |
635 | ||
1a20ff27 DG |
636 | extern void partition_sched_domains(cpumask_t *partition1, |
637 | cpumask_t *partition2); | |
1da177e4 LT |
638 | #endif /* CONFIG_SMP */ |
639 | ||
640 | ||
641 | struct io_context; /* See blkdev.h */ | |
642 | void exit_io_context(void); | |
643 | struct cpuset; | |
644 | ||
645 | #define NGROUPS_SMALL 32 | |
646 | #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) | |
647 | struct group_info { | |
648 | int ngroups; | |
649 | atomic_t usage; | |
650 | gid_t small_block[NGROUPS_SMALL]; | |
651 | int nblocks; | |
652 | gid_t *blocks[0]; | |
653 | }; | |
654 | ||
655 | /* | |
656 | * get_group_info() must be called with the owning task locked (via task_lock()) | |
657 | * when task != current. The reason being that the vast majority of callers are | |
658 | * looking at current->group_info, which can not be changed except by the | |
659 | * current task. Changing current->group_info requires the task lock, too. | |
660 | */ | |
661 | #define get_group_info(group_info) do { \ | |
662 | atomic_inc(&(group_info)->usage); \ | |
663 | } while (0) | |
664 | ||
665 | #define put_group_info(group_info) do { \ | |
666 | if (atomic_dec_and_test(&(group_info)->usage)) \ | |
667 | groups_free(group_info); \ | |
668 | } while (0) | |
669 | ||
3e30148c DH |
670 | extern struct group_info *groups_alloc(int gidsetsize); |
671 | extern void groups_free(struct group_info *group_info); | |
672 | extern int set_current_groups(struct group_info *group_info); | |
673 | extern int groups_search(struct group_info *group_info, gid_t grp); | |
1da177e4 LT |
674 | /* access the groups "array" with this macro */ |
675 | #define GROUP_AT(gi, i) \ | |
676 | ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) | |
677 | ||
383f2835 KC |
678 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
679 | extern void prefetch_stack(struct task_struct*); | |
680 | #else | |
681 | static inline void prefetch_stack(struct task_struct *t) { } | |
682 | #endif | |
1da177e4 LT |
683 | |
684 | struct audit_context; /* See audit.c */ | |
685 | struct mempolicy; | |
686 | ||
687 | struct task_struct { | |
688 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
689 | struct thread_info *thread_info; | |
690 | atomic_t usage; | |
691 | unsigned long flags; /* per process flags, defined below */ | |
692 | unsigned long ptrace; | |
693 | ||
36772092 | 694 | int lock_depth; /* BKL lock depth */ |
1da177e4 | 695 | |
4866cde0 NP |
696 | #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW) |
697 | int oncpu; | |
698 | #endif | |
1da177e4 LT |
699 | int prio, static_prio; |
700 | struct list_head run_list; | |
701 | prio_array_t *array; | |
702 | ||
22e2c507 JA |
703 | unsigned short ioprio; |
704 | ||
1da177e4 LT |
705 | unsigned long sleep_avg; |
706 | unsigned long long timestamp, last_ran; | |
707 | unsigned long long sched_time; /* sched_clock time spent running */ | |
708 | int activated; | |
709 | ||
710 | unsigned long policy; | |
711 | cpumask_t cpus_allowed; | |
712 | unsigned int time_slice, first_time_slice; | |
713 | ||
714 | #ifdef CONFIG_SCHEDSTATS | |
715 | struct sched_info sched_info; | |
716 | #endif | |
717 | ||
718 | struct list_head tasks; | |
719 | /* | |
720 | * ptrace_list/ptrace_children forms the list of my children | |
721 | * that were stolen by a ptracer. | |
722 | */ | |
723 | struct list_head ptrace_children; | |
724 | struct list_head ptrace_list; | |
725 | ||
726 | struct mm_struct *mm, *active_mm; | |
727 | ||
728 | /* task state */ | |
729 | struct linux_binfmt *binfmt; | |
730 | long exit_state; | |
731 | int exit_code, exit_signal; | |
732 | int pdeath_signal; /* The signal sent when the parent dies */ | |
733 | /* ??? */ | |
734 | unsigned long personality; | |
735 | unsigned did_exec:1; | |
736 | pid_t pid; | |
737 | pid_t tgid; | |
738 | /* | |
739 | * pointers to (original) parent process, youngest child, younger sibling, | |
740 | * older sibling, respectively. (p->father can be replaced with | |
741 | * p->parent->pid) | |
742 | */ | |
743 | struct task_struct *real_parent; /* real parent process (when being debugged) */ | |
744 | struct task_struct *parent; /* parent process */ | |
745 | /* | |
746 | * children/sibling forms the list of my children plus the | |
747 | * tasks I'm ptracing. | |
748 | */ | |
749 | struct list_head children; /* list of my children */ | |
750 | struct list_head sibling; /* linkage in my parent's children list */ | |
751 | struct task_struct *group_leader; /* threadgroup leader */ | |
752 | ||
753 | /* PID/PID hash table linkage. */ | |
754 | struct pid pids[PIDTYPE_MAX]; | |
755 | ||
756 | struct completion *vfork_done; /* for vfork() */ | |
757 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
758 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
759 | ||
760 | unsigned long rt_priority; | |
761 | cputime_t utime, stime; | |
762 | unsigned long nvcsw, nivcsw; /* context switch counts */ | |
763 | struct timespec start_time; | |
764 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ | |
765 | unsigned long min_flt, maj_flt; | |
766 | ||
767 | cputime_t it_prof_expires, it_virt_expires; | |
768 | unsigned long long it_sched_expires; | |
769 | struct list_head cpu_timers[3]; | |
770 | ||
771 | /* process credentials */ | |
772 | uid_t uid,euid,suid,fsuid; | |
773 | gid_t gid,egid,sgid,fsgid; | |
774 | struct group_info *group_info; | |
775 | kernel_cap_t cap_effective, cap_inheritable, cap_permitted; | |
776 | unsigned keep_capabilities:1; | |
777 | struct user_struct *user; | |
778 | #ifdef CONFIG_KEYS | |
779 | struct key *thread_keyring; /* keyring private to this thread */ | |
3e30148c | 780 | unsigned char jit_keyring; /* default keyring to attach requested keys to */ |
1da177e4 LT |
781 | #endif |
782 | int oomkilladj; /* OOM kill score adjustment (bit shift). */ | |
36772092 PBG |
783 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
784 | - access with [gs]et_task_comm (which lock | |
785 | it with task_lock()) | |
786 | - initialized normally by flush_old_exec */ | |
1da177e4 LT |
787 | /* file system info */ |
788 | int link_count, total_link_count; | |
789 | /* ipc stuff */ | |
790 | struct sysv_sem sysvsem; | |
791 | /* CPU-specific state of this task */ | |
792 | struct thread_struct thread; | |
793 | /* filesystem information */ | |
794 | struct fs_struct *fs; | |
795 | /* open file information */ | |
796 | struct files_struct *files; | |
797 | /* namespace */ | |
798 | struct namespace *namespace; | |
799 | /* signal handlers */ | |
800 | struct signal_struct *signal; | |
801 | struct sighand_struct *sighand; | |
802 | ||
803 | sigset_t blocked, real_blocked; | |
804 | struct sigpending pending; | |
805 | ||
806 | unsigned long sas_ss_sp; | |
807 | size_t sas_ss_size; | |
808 | int (*notifier)(void *priv); | |
809 | void *notifier_data; | |
810 | sigset_t *notifier_mask; | |
811 | ||
812 | void *security; | |
813 | struct audit_context *audit_context; | |
814 | seccomp_t seccomp; | |
815 | ||
816 | /* Thread group tracking */ | |
817 | u32 parent_exec_id; | |
818 | u32 self_exec_id; | |
819 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ | |
820 | spinlock_t alloc_lock; | |
821 | /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */ | |
822 | spinlock_t proc_lock; | |
1da177e4 LT |
823 | |
824 | /* journalling filesystem info */ | |
825 | void *journal_info; | |
826 | ||
827 | /* VM state */ | |
828 | struct reclaim_state *reclaim_state; | |
829 | ||
830 | struct dentry *proc_dentry; | |
831 | struct backing_dev_info *backing_dev_info; | |
832 | ||
833 | struct io_context *io_context; | |
834 | ||
835 | unsigned long ptrace_message; | |
836 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
837 | /* | |
838 | * current io wait handle: wait queue entry to use for io waits | |
839 | * If this thread is processing aio, this points at the waitqueue | |
840 | * inside the currently handled kiocb. It may be NULL (i.e. default | |
841 | * to a stack based synchronous wait) if its doing sync IO. | |
842 | */ | |
843 | wait_queue_t *io_wait; | |
844 | /* i/o counters(bytes read/written, #syscalls */ | |
845 | u64 rchar, wchar, syscr, syscw; | |
846 | #if defined(CONFIG_BSD_PROCESS_ACCT) | |
847 | u64 acct_rss_mem1; /* accumulated rss usage */ | |
848 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
849 | clock_t acct_stimexpd; /* clock_t-converted stime since last update */ | |
850 | #endif | |
851 | #ifdef CONFIG_NUMA | |
852 | struct mempolicy *mempolicy; | |
853 | short il_next; | |
854 | #endif | |
855 | #ifdef CONFIG_CPUSETS | |
856 | struct cpuset *cpuset; | |
857 | nodemask_t mems_allowed; | |
858 | int cpuset_mems_generation; | |
859 | #endif | |
22e2c507 | 860 | atomic_t fs_excl; /* holding fs exclusive resources */ |
1da177e4 LT |
861 | }; |
862 | ||
863 | static inline pid_t process_group(struct task_struct *tsk) | |
864 | { | |
865 | return tsk->signal->pgrp; | |
866 | } | |
867 | ||
868 | /** | |
869 | * pid_alive - check that a task structure is not stale | |
870 | * @p: Task structure to be checked. | |
871 | * | |
872 | * Test if a process is not yet dead (at most zombie state) | |
873 | * If pid_alive fails, then pointers within the task structure | |
874 | * can be stale and must not be dereferenced. | |
875 | */ | |
876 | static inline int pid_alive(struct task_struct *p) | |
877 | { | |
878 | return p->pids[PIDTYPE_PID].nr != 0; | |
879 | } | |
880 | ||
881 | extern void free_task(struct task_struct *tsk); | |
882 | extern void __put_task_struct(struct task_struct *tsk); | |
883 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) | |
884 | #define put_task_struct(tsk) \ | |
885 | do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0) | |
886 | ||
887 | /* | |
888 | * Per process flags | |
889 | */ | |
890 | #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ | |
891 | /* Not implemented yet, only for 486*/ | |
892 | #define PF_STARTING 0x00000002 /* being created */ | |
893 | #define PF_EXITING 0x00000004 /* getting shut down */ | |
894 | #define PF_DEAD 0x00000008 /* Dead */ | |
895 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ | |
896 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ | |
897 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
898 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
899 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
900 | #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ | |
901 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ | |
902 | #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */ | |
903 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ | |
904 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
905 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
906 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
907 | #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ | |
908 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ | |
909 | #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */ | |
910 | #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */ | |
911 | #define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */ | |
912 | ||
913 | /* | |
914 | * Only the _current_ task can read/write to tsk->flags, but other | |
915 | * tasks can access tsk->flags in readonly mode for example | |
916 | * with tsk_used_math (like during threaded core dumping). | |
917 | * There is however an exception to this rule during ptrace | |
918 | * or during fork: the ptracer task is allowed to write to the | |
919 | * child->flags of its traced child (same goes for fork, the parent | |
920 | * can write to the child->flags), because we're guaranteed the | |
921 | * child is not running and in turn not changing child->flags | |
922 | * at the same time the parent does it. | |
923 | */ | |
924 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
925 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
926 | #define clear_used_math() clear_stopped_child_used_math(current) | |
927 | #define set_used_math() set_stopped_child_used_math(current) | |
928 | #define conditional_stopped_child_used_math(condition, child) \ | |
929 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
930 | #define conditional_used_math(condition) \ | |
931 | conditional_stopped_child_used_math(condition, current) | |
932 | #define copy_to_stopped_child_used_math(child) \ | |
933 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
934 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
935 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
936 | #define used_math() tsk_used_math(current) | |
937 | ||
938 | #ifdef CONFIG_SMP | |
939 | extern int set_cpus_allowed(task_t *p, cpumask_t new_mask); | |
940 | #else | |
941 | static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask) | |
942 | { | |
4098f991 | 943 | if (!cpu_isset(0, new_mask)) |
1da177e4 LT |
944 | return -EINVAL; |
945 | return 0; | |
946 | } | |
947 | #endif | |
948 | ||
949 | extern unsigned long long sched_clock(void); | |
950 | extern unsigned long long current_sched_time(const task_t *current_task); | |
951 | ||
952 | /* sched_exec is called by processes performing an exec */ | |
953 | #ifdef CONFIG_SMP | |
954 | extern void sched_exec(void); | |
955 | #else | |
956 | #define sched_exec() {} | |
957 | #endif | |
958 | ||
959 | #ifdef CONFIG_HOTPLUG_CPU | |
960 | extern void idle_task_exit(void); | |
961 | #else | |
962 | static inline void idle_task_exit(void) {} | |
963 | #endif | |
964 | ||
965 | extern void sched_idle_next(void); | |
966 | extern void set_user_nice(task_t *p, long nice); | |
967 | extern int task_prio(const task_t *p); | |
968 | extern int task_nice(const task_t *p); | |
e43379f1 | 969 | extern int can_nice(const task_t *p, const int nice); |
1da177e4 LT |
970 | extern int task_curr(const task_t *p); |
971 | extern int idle_cpu(int cpu); | |
972 | extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); | |
973 | extern task_t *idle_task(int cpu); | |
a2a97982 KO |
974 | extern task_t *curr_task(int cpu); |
975 | extern void set_curr_task(int cpu, task_t *p); | |
1da177e4 LT |
976 | |
977 | void yield(void); | |
978 | ||
979 | /* | |
980 | * The default (Linux) execution domain. | |
981 | */ | |
982 | extern struct exec_domain default_exec_domain; | |
983 | ||
984 | union thread_union { | |
985 | struct thread_info thread_info; | |
986 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
987 | }; | |
988 | ||
989 | #ifndef __HAVE_ARCH_KSTACK_END | |
990 | static inline int kstack_end(void *addr) | |
991 | { | |
992 | /* Reliable end of stack detection: | |
993 | * Some APM bios versions misalign the stack | |
994 | */ | |
995 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
996 | } | |
997 | #endif | |
998 | ||
999 | extern union thread_union init_thread_union; | |
1000 | extern struct task_struct init_task; | |
1001 | ||
1002 | extern struct mm_struct init_mm; | |
1003 | ||
1004 | #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr) | |
1005 | extern struct task_struct *find_task_by_pid_type(int type, int pid); | |
1006 | extern void set_special_pids(pid_t session, pid_t pgrp); | |
1007 | extern void __set_special_pids(pid_t session, pid_t pgrp); | |
1008 | ||
1009 | /* per-UID process charging. */ | |
1010 | extern struct user_struct * alloc_uid(uid_t); | |
1011 | static inline struct user_struct *get_uid(struct user_struct *u) | |
1012 | { | |
1013 | atomic_inc(&u->__count); | |
1014 | return u; | |
1015 | } | |
1016 | extern void free_uid(struct user_struct *); | |
1017 | extern void switch_uid(struct user_struct *); | |
1018 | ||
1019 | #include <asm/current.h> | |
1020 | ||
1021 | extern void do_timer(struct pt_regs *); | |
1022 | ||
1023 | extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); | |
1024 | extern int FASTCALL(wake_up_process(struct task_struct * tsk)); | |
1025 | extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, | |
1026 | unsigned long clone_flags)); | |
1027 | #ifdef CONFIG_SMP | |
1028 | extern void kick_process(struct task_struct *tsk); | |
1029 | #else | |
1030 | static inline void kick_process(struct task_struct *tsk) { } | |
1031 | #endif | |
476d139c | 1032 | extern void FASTCALL(sched_fork(task_t * p, int clone_flags)); |
1da177e4 LT |
1033 | extern void FASTCALL(sched_exit(task_t * p)); |
1034 | ||
1035 | extern int in_group_p(gid_t); | |
1036 | extern int in_egroup_p(gid_t); | |
1037 | ||
1038 | extern void proc_caches_init(void); | |
1039 | extern void flush_signals(struct task_struct *); | |
1040 | extern void flush_signal_handlers(struct task_struct *, int force_default); | |
1041 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
1042 | ||
1043 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
1044 | { | |
1045 | unsigned long flags; | |
1046 | int ret; | |
1047 | ||
1048 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
1049 | ret = dequeue_signal(tsk, mask, info); | |
1050 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
1051 | ||
1052 | return ret; | |
1053 | } | |
1054 | ||
1055 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
1056 | sigset_t *mask); | |
1057 | extern void unblock_all_signals(void); | |
1058 | extern void release_task(struct task_struct * p); | |
1059 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1060 | extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); | |
1061 | extern int force_sigsegv(int, struct task_struct *); | |
1062 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
1063 | extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp); | |
1064 | extern int kill_pg_info(int, struct siginfo *, pid_t); | |
1065 | extern int kill_proc_info(int, struct siginfo *, pid_t); | |
46113830 | 1066 | extern int kill_proc_info_as_uid(int, struct siginfo *, pid_t, uid_t, uid_t); |
1da177e4 LT |
1067 | extern void do_notify_parent(struct task_struct *, int); |
1068 | extern void force_sig(int, struct task_struct *); | |
1069 | extern void force_sig_specific(int, struct task_struct *); | |
1070 | extern int send_sig(int, struct task_struct *, int); | |
1071 | extern void zap_other_threads(struct task_struct *p); | |
1072 | extern int kill_pg(pid_t, int, int); | |
1073 | extern int kill_sl(pid_t, int, int); | |
1074 | extern int kill_proc(pid_t, int, int); | |
1075 | extern struct sigqueue *sigqueue_alloc(void); | |
1076 | extern void sigqueue_free(struct sigqueue *); | |
1077 | extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); | |
1078 | extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); | |
1079 | extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *); | |
1080 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); | |
1081 | ||
1082 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ | |
1083 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
1084 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
1085 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
1086 | ||
1087 | /* True if we are on the alternate signal stack. */ | |
1088 | ||
1089 | static inline int on_sig_stack(unsigned long sp) | |
1090 | { | |
1091 | return (sp - current->sas_ss_sp < current->sas_ss_size); | |
1092 | } | |
1093 | ||
1094 | static inline int sas_ss_flags(unsigned long sp) | |
1095 | { | |
1096 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
1097 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
1098 | } | |
1099 | ||
1100 | ||
1101 | #ifdef CONFIG_SECURITY | |
1102 | /* code is in security.c */ | |
1103 | extern int capable(int cap); | |
1104 | #else | |
1105 | static inline int capable(int cap) | |
1106 | { | |
1107 | if (cap_raised(current->cap_effective, cap)) { | |
1108 | current->flags |= PF_SUPERPRIV; | |
1109 | return 1; | |
1110 | } | |
1111 | return 0; | |
1112 | } | |
1113 | #endif | |
1114 | ||
1115 | /* | |
1116 | * Routines for handling mm_structs | |
1117 | */ | |
1118 | extern struct mm_struct * mm_alloc(void); | |
1119 | ||
1120 | /* mmdrop drops the mm and the page tables */ | |
1121 | extern void FASTCALL(__mmdrop(struct mm_struct *)); | |
1122 | static inline void mmdrop(struct mm_struct * mm) | |
1123 | { | |
1124 | if (atomic_dec_and_test(&mm->mm_count)) | |
1125 | __mmdrop(mm); | |
1126 | } | |
1127 | ||
1128 | /* mmput gets rid of the mappings and all user-space */ | |
1129 | extern void mmput(struct mm_struct *); | |
1130 | /* Grab a reference to a task's mm, if it is not already going away */ | |
1131 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
1132 | /* Remove the current tasks stale references to the old mm_struct */ | |
1133 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
1134 | ||
1135 | extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); | |
1136 | extern void flush_thread(void); | |
1137 | extern void exit_thread(void); | |
1138 | ||
1da177e4 LT |
1139 | extern void exit_files(struct task_struct *); |
1140 | extern void exit_signal(struct task_struct *); | |
1141 | extern void __exit_signal(struct task_struct *); | |
1142 | extern void exit_sighand(struct task_struct *); | |
1143 | extern void __exit_sighand(struct task_struct *); | |
1144 | extern void exit_itimers(struct signal_struct *); | |
1145 | ||
1146 | extern NORET_TYPE void do_group_exit(int); | |
1147 | ||
1da177e4 LT |
1148 | extern void daemonize(const char *, ...); |
1149 | extern int allow_signal(int); | |
1150 | extern int disallow_signal(int); | |
1151 | extern task_t *child_reaper; | |
1152 | ||
1153 | extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); | |
1154 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); | |
1155 | task_t *fork_idle(int); | |
1156 | ||
1157 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
1158 | extern void get_task_comm(char *to, struct task_struct *tsk); | |
1159 | ||
1160 | #ifdef CONFIG_SMP | |
1161 | extern void wait_task_inactive(task_t * p); | |
1162 | #else | |
1163 | #define wait_task_inactive(p) do { } while (0) | |
1164 | #endif | |
1165 | ||
1166 | #define remove_parent(p) list_del_init(&(p)->sibling) | |
1167 | #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children) | |
1168 | ||
1169 | #define REMOVE_LINKS(p) do { \ | |
1170 | if (thread_group_leader(p)) \ | |
1171 | list_del_init(&(p)->tasks); \ | |
1172 | remove_parent(p); \ | |
1173 | } while (0) | |
1174 | ||
1175 | #define SET_LINKS(p) do { \ | |
1176 | if (thread_group_leader(p)) \ | |
1177 | list_add_tail(&(p)->tasks,&init_task.tasks); \ | |
1178 | add_parent(p, (p)->parent); \ | |
1179 | } while (0) | |
1180 | ||
1181 | #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks) | |
1182 | #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks) | |
1183 | ||
1184 | #define for_each_process(p) \ | |
1185 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
1186 | ||
1187 | /* | |
1188 | * Careful: do_each_thread/while_each_thread is a double loop so | |
1189 | * 'break' will not work as expected - use goto instead. | |
1190 | */ | |
1191 | #define do_each_thread(g, t) \ | |
1192 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
1193 | ||
1194 | #define while_each_thread(g, t) \ | |
1195 | while ((t = next_thread(t)) != g) | |
1196 | ||
1197 | extern task_t * FASTCALL(next_thread(const task_t *p)); | |
1198 | ||
1199 | #define thread_group_leader(p) (p->pid == p->tgid) | |
1200 | ||
1201 | static inline int thread_group_empty(task_t *p) | |
1202 | { | |
1203 | return list_empty(&p->pids[PIDTYPE_TGID].pid_list); | |
1204 | } | |
1205 | ||
1206 | #define delay_group_leader(p) \ | |
1207 | (thread_group_leader(p) && !thread_group_empty(p)) | |
1208 | ||
1209 | extern void unhash_process(struct task_struct *p); | |
1210 | ||
1211 | /* | |
1212 | * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring | |
22e2c507 | 1213 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
053199ed | 1214 | * pins the final release of task.io_context. Also protects ->cpuset. |
1da177e4 LT |
1215 | * |
1216 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
1217 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
1218 | * neither inside nor outside. | |
1219 | */ | |
1220 | static inline void task_lock(struct task_struct *p) | |
1221 | { | |
1222 | spin_lock(&p->alloc_lock); | |
1223 | } | |
1224 | ||
1225 | static inline void task_unlock(struct task_struct *p) | |
1226 | { | |
1227 | spin_unlock(&p->alloc_lock); | |
1228 | } | |
1229 | ||
1230 | /* set thread flags in other task's structures | |
1231 | * - see asm/thread_info.h for TIF_xxxx flags available | |
1232 | */ | |
1233 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1234 | { | |
1235 | set_ti_thread_flag(tsk->thread_info,flag); | |
1236 | } | |
1237 | ||
1238 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1239 | { | |
1240 | clear_ti_thread_flag(tsk->thread_info,flag); | |
1241 | } | |
1242 | ||
1243 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1244 | { | |
1245 | return test_and_set_ti_thread_flag(tsk->thread_info,flag); | |
1246 | } | |
1247 | ||
1248 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1249 | { | |
1250 | return test_and_clear_ti_thread_flag(tsk->thread_info,flag); | |
1251 | } | |
1252 | ||
1253 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1254 | { | |
1255 | return test_ti_thread_flag(tsk->thread_info,flag); | |
1256 | } | |
1257 | ||
1258 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1259 | { | |
1260 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1261 | } | |
1262 | ||
1263 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1264 | { | |
1265 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1266 | } | |
1267 | ||
1268 | static inline int signal_pending(struct task_struct *p) | |
1269 | { | |
1270 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
1271 | } | |
1272 | ||
1273 | static inline int need_resched(void) | |
1274 | { | |
1275 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); | |
1276 | } | |
1277 | ||
1278 | /* | |
1279 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1280 | * explicit rescheduling in places that are safe. The return | |
1281 | * value indicates whether a reschedule was done in fact. | |
1282 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1283 | * cond_resched_softirq() will enable bhs before scheduling. | |
1284 | */ | |
1285 | extern int cond_resched(void); | |
1286 | extern int cond_resched_lock(spinlock_t * lock); | |
1287 | extern int cond_resched_softirq(void); | |
1288 | ||
1289 | /* | |
1290 | * Does a critical section need to be broken due to another | |
1291 | * task waiting?: | |
1292 | */ | |
1293 | #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) | |
1294 | # define need_lockbreak(lock) ((lock)->break_lock) | |
1295 | #else | |
1296 | # define need_lockbreak(lock) 0 | |
1297 | #endif | |
1298 | ||
1299 | /* | |
1300 | * Does a critical section need to be broken due to another | |
1301 | * task waiting or preemption being signalled: | |
1302 | */ | |
1303 | static inline int lock_need_resched(spinlock_t *lock) | |
1304 | { | |
1305 | if (need_lockbreak(lock) || need_resched()) | |
1306 | return 1; | |
1307 | return 0; | |
1308 | } | |
1309 | ||
1310 | /* Reevaluate whether the task has signals pending delivery. | |
1311 | This is required every time the blocked sigset_t changes. | |
1312 | callers must hold sighand->siglock. */ | |
1313 | ||
1314 | extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t)); | |
1315 | extern void recalc_sigpending(void); | |
1316 | ||
1317 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
1318 | ||
1319 | /* | |
1320 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
1321 | */ | |
1322 | #ifdef CONFIG_SMP | |
1323 | ||
1324 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1325 | { | |
1326 | return p->thread_info->cpu; | |
1327 | } | |
1328 | ||
1329 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1330 | { | |
1331 | p->thread_info->cpu = cpu; | |
1332 | } | |
1333 | ||
1334 | #else | |
1335 | ||
1336 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1337 | { | |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1342 | { | |
1343 | } | |
1344 | ||
1345 | #endif /* CONFIG_SMP */ | |
1346 | ||
1347 | #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT | |
1348 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1349 | #else | |
1350 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) | |
1351 | { | |
1352 | mm->mmap_base = TASK_UNMAPPED_BASE; | |
1353 | mm->get_unmapped_area = arch_get_unmapped_area; | |
1354 | mm->unmap_area = arch_unmap_area; | |
1355 | } | |
1356 | #endif | |
1357 | ||
1358 | extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); | |
1359 | extern long sched_getaffinity(pid_t pid, cpumask_t *mask); | |
1360 | ||
1361 | #ifdef CONFIG_MAGIC_SYSRQ | |
1362 | ||
1363 | extern void normalize_rt_tasks(void); | |
1364 | ||
1365 | #endif | |
1366 | ||
1da177e4 | 1367 | #ifdef CONFIG_PM |
3e1d1d28 CL |
1368 | /* |
1369 | * Check if a process has been frozen | |
1370 | */ | |
1371 | static inline int frozen(struct task_struct *p) | |
1372 | { | |
1373 | return p->flags & PF_FROZEN; | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * Check if there is a request to freeze a process | |
1378 | */ | |
1379 | static inline int freezing(struct task_struct *p) | |
1380 | { | |
1381 | return p->flags & PF_FREEZE; | |
1382 | } | |
1383 | ||
1384 | /* | |
1385 | * Request that a process be frozen | |
1386 | * FIXME: SMP problem. We may not modify other process' flags! | |
1387 | */ | |
1388 | static inline void freeze(struct task_struct *p) | |
1389 | { | |
1390 | p->flags |= PF_FREEZE; | |
1391 | } | |
1392 | ||
1393 | /* | |
1394 | * Wake up a frozen process | |
1395 | */ | |
1396 | static inline int thaw_process(struct task_struct *p) | |
1397 | { | |
1398 | if (frozen(p)) { | |
1399 | p->flags &= ~PF_FROZEN; | |
1400 | wake_up_process(p); | |
1401 | return 1; | |
1402 | } | |
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * freezing is complete, mark process as frozen | |
1408 | */ | |
1409 | static inline void frozen_process(struct task_struct *p) | |
1410 | { | |
1411 | p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN; | |
1412 | } | |
1413 | ||
1414 | extern void refrigerator(void); | |
1da177e4 LT |
1415 | extern int freeze_processes(void); |
1416 | extern void thaw_processes(void); | |
1417 | ||
3e1d1d28 | 1418 | static inline int try_to_freeze(void) |
1da177e4 | 1419 | { |
3e1d1d28 CL |
1420 | if (freezing(current)) { |
1421 | refrigerator(); | |
1da177e4 LT |
1422 | return 1; |
1423 | } else | |
1424 | return 0; | |
1425 | } | |
1426 | #else | |
3e1d1d28 CL |
1427 | static inline int frozen(struct task_struct *p) { return 0; } |
1428 | static inline int freezing(struct task_struct *p) { return 0; } | |
1429 | static inline void freeze(struct task_struct *p) { BUG(); } | |
1430 | static inline int thaw_process(struct task_struct *p) { return 1; } | |
1431 | static inline void frozen_process(struct task_struct *p) { BUG(); } | |
1432 | ||
1433 | static inline void refrigerator(void) {} | |
1da177e4 LT |
1434 | static inline int freeze_processes(void) { BUG(); return 0; } |
1435 | static inline void thaw_processes(void) {} | |
1436 | ||
3e1d1d28 CL |
1437 | static inline int try_to_freeze(void) { return 0; } |
1438 | ||
1da177e4 LT |
1439 | #endif /* CONFIG_PM */ |
1440 | #endif /* __KERNEL__ */ | |
1441 | ||
1442 | #endif |