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