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 extern void do_timer(struct pt_regs *);
285
286 extern unsigned long * prof_buffer;
287 extern unsigned long prof_len;
288 extern unsigned long prof_shift;
289
290 #define CURRENT_TIME (xtime.tv_sec)
291
292 extern void sleep_on(struct wait_queue ** p);
293 extern void interruptible_sleep_on(struct wait_queue ** p);
294 extern void wake_up(struct wait_queue ** p);
295 extern void wake_up_interruptible(struct wait_queue ** p);
296 extern void wake_up_process(struct task_struct * tsk);
297
298 extern void notify_parent(struct task_struct * tsk);
299 extern int send_sig(unsigned long sig,struct task_struct * p,int priv);
300 extern int in_group_p(gid_t grp);
301
302 extern int request_irq(unsigned int irq,void (*handler)(int, struct pt_regs *),
303 unsigned long flags, const char *device);
304 extern void free_irq(unsigned int irq);
305
306 extern void copy_thread(int, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
307 extern void flush_thread(void);
308 extern void exit_thread(void);
309
310 extern void exit_fs(struct task_struct *);
311 extern void exit_files(struct task_struct *);
312 extern void exit_sighand(struct task_struct *);
313
314 extern int do_execve(char *, char **, char **, struct pt_regs *);
315 extern int do_fork(unsigned long, unsigned long, struct pt_regs *);
316
317
318
319
320
321
322 extern inline void add_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
323 {
324 unsigned long flags;
325
326 #ifdef DEBUG
327 if (wait->next) {
328 __label__ here;
329 unsigned long pc;
330 pc = (unsigned long) &&here;
331 here:
332 printk("add_wait_queue (%08lx): wait->next = %08lx\n",pc,(unsigned long) wait->next);
333 }
334 #endif
335 save_flags(flags);
336 cli();
337 if (!*p) {
338 wait->next = wait;
339 *p = wait;
340 } else {
341 wait->next = (*p)->next;
342 (*p)->next = wait;
343 }
344 restore_flags(flags);
345 }
346
347 extern inline void remove_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
348 {
349 unsigned long flags;
350 struct wait_queue * tmp;
351 #ifdef DEBUG
352 unsigned long ok = 0;
353 #endif
354
355 save_flags(flags);
356 cli();
357 if ((*p == wait) &&
358 #ifdef DEBUG
359 (ok = 1) &&
360 #endif
361 ((*p = wait->next) == wait)) {
362 *p = NULL;
363 } else {
364 tmp = wait;
365 while (tmp->next != wait) {
366 tmp = tmp->next;
367 #ifdef DEBUG
368 if (tmp == *p)
369 ok = 1;
370 #endif
371 }
372 tmp->next = wait->next;
373 }
374 wait->next = NULL;
375 restore_flags(flags);
376 #ifdef DEBUG
377 if (!ok) {
378 __label__ here;
379 ok = (unsigned long) &&here;
380 printk("removed wait_queue not on list.\n");
381 printk("list = %08lx, queue = %08lx\n",(unsigned long) p, (unsigned long) wait);
382 here:
383 printk("eip = %08lx\n",ok);
384 }
385 #endif
386 }
387
388 extern inline void select_wait(struct wait_queue ** wait_address, select_table * p)
389 {
390 struct select_table_entry * entry;
391
392 if (!p || !wait_address)
393 return;
394 if (p->nr >= __MAX_SELECT_TABLE_ENTRIES)
395 return;
396 entry = p->entry + p->nr;
397 entry->wait_address = wait_address;
398 entry->wait.task = current;
399 entry->wait.next = NULL;
400 add_wait_queue(wait_address,&entry->wait);
401 p->nr++;
402 }
403
404 extern void __down(struct semaphore * sem);
405
406
407
408
409 extern inline void down(struct semaphore * sem)
410 {
411 if (sem->count <= 0)
412 __down(sem);
413 sem->count--;
414 }
415
416 extern inline void up(struct semaphore * sem)
417 {
418 sem->count++;
419 wake_up(&sem->wait);
420 }
421
422 #define REMOVE_LINKS(p) do { unsigned long flags; \
423 save_flags(flags) ; cli(); \
424 (p)->next_task->prev_task = (p)->prev_task; \
425 (p)->prev_task->next_task = (p)->next_task; \
426 restore_flags(flags); \
427 if ((p)->p_osptr) \
428 (p)->p_osptr->p_ysptr = (p)->p_ysptr; \
429 if ((p)->p_ysptr) \
430 (p)->p_ysptr->p_osptr = (p)->p_osptr; \
431 else \
432 (p)->p_pptr->p_cptr = (p)->p_osptr; \
433 } while (0)
434
435 #define SET_LINKS(p) do { unsigned long flags; \
436 save_flags(flags); cli(); \
437 (p)->next_task = &init_task; \
438 (p)->prev_task = init_task.prev_task; \
439 init_task.prev_task->next_task = (p); \
440 init_task.prev_task = (p); \
441 restore_flags(flags); \
442 (p)->p_ysptr = NULL; \
443 if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
444 (p)->p_osptr->p_ysptr = p; \
445 (p)->p_pptr->p_cptr = p; \
446 } while (0)
447
448 #define for_each_task(p) \
449 for (p = &init_task ; (p = p->next_task) != &init_task ; )
450
451 #endif
452
453 #endif