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