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