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