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