This source file includes following definitions.
- suser
- file_from_fd
- add_wait_queue
- remove_wait_queue
- select_wait
- down
- up
1 #ifndef _LINUX_SCHED_H
2 #define _LINUX_SCHED_H
3
4
5
6
7
8
9
10
11
12 #include <asm/param.h>
13
14 extern unsigned long intr_count;
15 extern unsigned long event;
16
17 #include <linux/binfmts.h>
18 #include <linux/personality.h>
19 #include <linux/tasks.h>
20 #include <linux/kernel.h>
21 #include <asm/system.h>
22 #include <asm/page.h>
23
24 #include <linux/smp.h>
25 #include <linux/tty.h>
26 #include <linux/sem.h>
27
28
29
30
31 #define CSIGNAL 0x000000ff
32 #define CLONE_VM 0x00000100
33 #define CLONE_FS 0x00000200
34 #define CLONE_FILES 0x00000400
35 #define CLONE_SIGHAND 0x00000800
36 #define CLONE_PID 0x00001000
37
38
39
40
41
42
43
44
45
46
47
48 extern unsigned long avenrun[];
49
50 #define FSHIFT 11
51 #define FIXED_1 (1<<FSHIFT)
52 #define LOAD_FREQ (5*HZ)
53 #define EXP_1 1884
54 #define EXP_5 2014
55 #define EXP_15 2037
56
57 #define CALC_LOAD(load,exp,n) \
58 load *= exp; \
59 load += n*(FIXED_1-exp); \
60 load >>= FSHIFT;
61
62 #define CT_TO_SECS(x) ((x) / HZ)
63 #define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ)
64
65 extern int nr_running, nr_tasks;
66 extern int last_pid;
67
68 #define FIRST_TASK task[0]
69 #define LAST_TASK task[NR_TASKS-1]
70
71 #include <linux/head.h>
72 #include <linux/fs.h>
73 #include <linux/signal.h>
74 #include <linux/time.h>
75 #include <linux/param.h>
76 #include <linux/resource.h>
77 #include <linux/vm86.h>
78 #include <linux/math_emu.h>
79 #include <linux/ptrace.h>
80 #include <linux/timer.h>
81
82 #include <asm/processor.h>
83
84 #define TASK_RUNNING 0
85 #define TASK_INTERRUPTIBLE 1
86 #define TASK_UNINTERRUPTIBLE 2
87 #define TASK_ZOMBIE 3
88 #define TASK_STOPPED 4
89 #define TASK_SWAPPING 5
90
91
92
93
94 #define SCHED_OTHER 0
95 #define SCHED_FIFO 1
96 #define SCHED_RR 2
97
98 struct sched_param {
99 int sched_priority;
100 };
101
102 #ifndef NULL
103 #define NULL ((void *) 0)
104 #endif
105
106 #ifdef __KERNEL__
107
108 extern void sched_init(void);
109 extern void show_state(void);
110 extern void trap_init(void);
111
112 asmlinkage void schedule(void);
113
114
115 struct files_struct {
116
117 int count;
118
119 fd_set close_on_exec;
120
121
122 struct file * fd[NR_OPEN];
123 };
124
125 #define INIT_FILES { \
126 1, \
127 { { 0, } }, \
128 { NULL, } \
129 }
130
131 struct fs_struct {
132 int count;
133 unsigned short umask;
134 struct inode * root, * pwd;
135 };
136
137 #define INIT_FS { \
138 1, \
139 0022, \
140 NULL, NULL \
141 }
142
143 struct mm_struct {
144 int count;
145 pgd_t * pgd;
146 unsigned long context;
147 unsigned long start_code, end_code, start_data, end_data;
148 unsigned long start_brk, brk, start_stack, start_mmap;
149 unsigned long arg_start, arg_end, env_start, env_end;
150 unsigned long rss, total_vm, locked_vm;
151 unsigned long def_flags;
152 struct vm_area_struct * mmap;
153 struct vm_area_struct * mmap_avl;
154 };
155
156 #define INIT_MM { \
157 1, \
158 swapper_pg_dir, \
159 0, \
160 0, 0, 0, 0, \
161 0, 0, 0, 0, \
162 0, 0, 0, 0, \
163 0, 0, 0, \
164 0, \
165 &init_mmap, &init_mmap }
166
167 struct signal_struct {
168 int count;
169 struct sigaction action[32];
170 };
171
172 #define INIT_SIGNALS { \
173 1, \
174 { {0,}, } }
175
176 struct task_struct {
177
178 volatile long state;
179 long counter;
180 long priority;
181 unsigned long signal;
182 unsigned long blocked;
183 unsigned long flags;
184 int errno;
185 long debugreg[8];
186 struct exec_domain *exec_domain;
187
188 struct linux_binfmt *binfmt;
189 struct task_struct *next_task, *prev_task;
190 struct task_struct *next_run, *prev_run;
191 unsigned long saved_kernel_stack;
192 unsigned long kernel_stack_page;
193 int exit_code, exit_signal;
194
195 unsigned long personality;
196 int dumpable:1;
197 int did_exec:1;
198
199 int pid;
200 int pgrp;
201 int tty_old_pgrp;
202 int session;
203
204 int leader;
205 int groups[NGROUPS];
206
207
208
209
210
211 struct task_struct *p_opptr, *p_pptr, *p_cptr, *p_ysptr, *p_osptr;
212 struct wait_queue *wait_chldexit;
213 unsigned short uid,euid,suid,fsuid;
214 unsigned short gid,egid,sgid,fsgid;
215 unsigned long timeout, policy, rt_priority;
216 unsigned long it_real_value, it_prof_value, it_virt_value;
217 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
218 struct timer_list real_timer;
219 long utime, stime, cutime, cstime, start_time;
220
221 unsigned long min_flt, maj_flt, nswap, cmin_flt, cmaj_flt, cnswap;
222 int swappable:1;
223 unsigned long swap_address;
224 unsigned long old_maj_flt;
225 unsigned long dec_flt;
226 unsigned long swap_cnt;
227
228 struct rlimit rlim[RLIM_NLIMITS];
229 unsigned short used_math;
230 char comm[16];
231
232 int link_count;
233 struct tty_struct *tty;
234
235 struct sem_undo *semundo;
236 struct sem_queue *semsleeping;
237
238 struct desc_struct *ldt;
239
240 struct thread_struct tss;
241
242 struct fs_struct *fs;
243
244 struct files_struct *files;
245
246 struct mm_struct *mm;
247
248 struct signal_struct *sig;
249 #ifdef __SMP__
250 int processor;
251 int last_processor;
252 int lock_depth;
253 #endif
254 };
255
256
257
258
259 #define PF_ALIGNWARN 0x00000001
260
261 #define PF_PTRACED 0x00000010
262 #define PF_TRACESYS 0x00000020
263 #define PF_FORKNOEXEC 0x00000040
264 #define PF_SUPERPRIV 0x00000100
265 #define PF_DUMPCORE 0x00000200
266 #define PF_SIGNALED 0x00000400
267
268 #define PF_STARTING 0x00000100
269 #define PF_EXITING 0x00000200
270
271 #define PF_USEDFPU 0x00100000
272
273
274
275
276
277 #define _STK_LIM (8*1024*1024)
278
279 #define DEF_PRIORITY (20*HZ/100)
280
281
282
283
284
285 #define INIT_TASK \
286 { 0,DEF_PRIORITY,DEF_PRIORITY,0,0,0,0, \
287 { 0, }, \
288 &default_exec_domain, \
289 NULL, \
290 &init_task,&init_task, &init_task, &init_task, \
291 0,(unsigned long) &init_kernel_stack, \
292 0,0,0,0,0, \
293 0,0,0,0,0, \
294 {NOGROUP,}, \
295 &init_task,&init_task,NULL,NULL,NULL,NULL, \
296 0,0,0,0,0,0,0,0, \
297 0,SCHED_OTHER,0,0,0,0,0,0,0, \
298 { NULL, NULL, 0, 0, it_real_fn }, \
299 0,0,0,0,0, \
300 0,0,0,0,0,0, \
301 0,0,0,0,0, \
302 INIT_RLIMITS, \
303 0, \
304 "swapper", \
305 0,NULL, \
306 NULL, NULL, \
307 NULL, \
308 INIT_TSS, \
309 &init_fs, \
310 &init_files, \
311 &init_mm, \
312 &init_signals, \
313 }
314
315 extern struct mm_struct init_mm;
316 extern struct task_struct init_task;
317 extern struct task_struct *task[NR_TASKS];
318 extern struct task_struct *last_task_used_math;
319 extern struct task_struct *current_set[NR_CPUS];
320
321
322
323
324 #define current (0+current_set[smp_processor_id()])
325 extern unsigned long volatile jiffies;
326 extern unsigned long itimer_ticks;
327 extern unsigned long itimer_next;
328 extern struct timeval xtime;
329 extern int need_resched;
330 extern void do_timer(struct pt_regs *);
331
332 extern unsigned int * prof_buffer;
333 extern unsigned long prof_len;
334 extern unsigned long prof_shift;
335
336 extern int securelevel;
337
338 #define CURRENT_TIME (xtime.tv_sec)
339
340 extern void sleep_on(struct wait_queue ** p);
341 extern void interruptible_sleep_on(struct wait_queue ** p);
342 extern void wake_up(struct wait_queue ** p);
343 extern void wake_up_interruptible(struct wait_queue ** p);
344 extern void wake_up_process(struct task_struct * tsk);
345
346 extern void notify_parent(struct task_struct * tsk);
347 extern int send_sig(unsigned long sig,struct task_struct * p,int priv);
348 extern int in_group_p(gid_t grp);
349
350 extern int request_irq(unsigned int irq,
351 void (*handler)(int, void *, struct pt_regs *),
352 unsigned long flags,
353 const char *device,
354 void *dev_id);
355 extern void free_irq(unsigned int irq, void *dev_id);
356
357
358
359
360
361
362
363 extern inline int suser(void)
364 {
365 if (current->euid == 0) {
366 current->flags |= PF_SUPERPRIV;
367 return 1;
368 }
369 return 0;
370 }
371
372 extern void copy_thread(int, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
373 extern void flush_thread(void);
374 extern void exit_thread(void);
375
376 extern void exit_fs(struct task_struct *);
377 extern void exit_files(struct task_struct *);
378 extern void exit_sighand(struct task_struct *);
379 extern void release_thread(struct task_struct *);
380
381 extern int do_execve(char *, char **, char **, struct pt_regs *);
382 extern int do_fork(unsigned long, unsigned long, struct pt_regs *);
383
384
385
386
387
388
389 extern inline struct file *file_from_fd(const unsigned int fd)
390 {
391
392 if (fd >= NR_OPEN)
393 return NULL;
394
395 return current->files->fd[fd];
396 }
397
398
399
400
401
402
403 extern inline void add_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
404 {
405 unsigned long flags;
406
407 #ifdef DEBUG
408 if (wait->next) {
409 __label__ here;
410 unsigned long pc;
411 pc = (unsigned long) &&here;
412 here:
413 printk("add_wait_queue (%08lx): wait->next = %08lx\n",pc,(unsigned long) wait->next);
414 }
415 #endif
416 save_flags(flags);
417 cli();
418 if (!*p) {
419 wait->next = wait;
420 *p = wait;
421 } else {
422 wait->next = (*p)->next;
423 (*p)->next = wait;
424 }
425 restore_flags(flags);
426 }
427
428 extern inline void remove_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
429 {
430 unsigned long flags;
431 struct wait_queue * tmp;
432 #ifdef DEBUG
433 unsigned long ok = 0;
434 #endif
435
436 save_flags(flags);
437 cli();
438 if ((*p == wait) &&
439 #ifdef DEBUG
440 (ok = 1) &&
441 #endif
442 ((*p = wait->next) == wait)) {
443 *p = NULL;
444 } else {
445 tmp = wait;
446 while (tmp->next != wait) {
447 tmp = tmp->next;
448 #ifdef DEBUG
449 if (tmp == *p)
450 ok = 1;
451 #endif
452 }
453 tmp->next = wait->next;
454 }
455 wait->next = NULL;
456 restore_flags(flags);
457 #ifdef DEBUG
458 if (!ok) {
459 __label__ here;
460 ok = (unsigned long) &&here;
461 printk("removed wait_queue not on list.\n");
462 printk("list = %08lx, queue = %08lx\n",(unsigned long) p, (unsigned long) wait);
463 here:
464 printk("eip = %08lx\n",ok);
465 }
466 #endif
467 }
468
469 extern inline void select_wait(struct wait_queue ** wait_address, select_table * p)
470 {
471 struct select_table_entry * entry;
472
473 if (!p || !wait_address)
474 return;
475 if (p->nr >= __MAX_SELECT_TABLE_ENTRIES)
476 return;
477 entry = p->entry + p->nr;
478 entry->wait_address = wait_address;
479 entry->wait.task = current;
480 entry->wait.next = NULL;
481 add_wait_queue(wait_address,&entry->wait);
482 p->nr++;
483 }
484
485 extern void __down(struct semaphore * sem);
486
487
488
489
490 extern inline void down(struct semaphore * sem)
491 {
492 if (sem->count <= 0)
493 __down(sem);
494 sem->count--;
495 }
496
497 extern inline void up(struct semaphore * sem)
498 {
499 sem->count++;
500 wake_up(&sem->wait);
501 }
502
503 #define REMOVE_LINKS(p) do { unsigned long flags; \
504 save_flags(flags) ; cli(); \
505 (p)->next_task->prev_task = (p)->prev_task; \
506 (p)->prev_task->next_task = (p)->next_task; \
507 restore_flags(flags); \
508 if ((p)->p_osptr) \
509 (p)->p_osptr->p_ysptr = (p)->p_ysptr; \
510 if ((p)->p_ysptr) \
511 (p)->p_ysptr->p_osptr = (p)->p_osptr; \
512 else \
513 (p)->p_pptr->p_cptr = (p)->p_osptr; \
514 } while (0)
515
516 #define SET_LINKS(p) do { unsigned long flags; \
517 save_flags(flags); cli(); \
518 (p)->next_task = &init_task; \
519 (p)->prev_task = init_task.prev_task; \
520 init_task.prev_task->next_task = (p); \
521 init_task.prev_task = (p); \
522 restore_flags(flags); \
523 (p)->p_ysptr = NULL; \
524 if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
525 (p)->p_osptr->p_ysptr = p; \
526 (p)->p_pptr->p_cptr = p; \
527 } while (0)
528
529 #define for_each_task(p) \
530 for (p = &init_task ; (p = p->next_task) != &init_task ; )
531
532 #endif
533
534 #endif