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