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
23
24
25
26
27
28
29
30
31
32
33 extern unsigned long avenrun[];
34
35 #define FSHIFT 11
36 #define FIXED_1 (1<<FSHIFT)
37 #define LOAD_FREQ (5*HZ)
38 #define EXP_1 1884
39 #define EXP_5 2014
40 #define EXP_15 2037
41
42 #define CALC_LOAD(load,exp,n) \
43 load *= exp; \
44 load += n*(FIXED_1-exp); \
45 load >>= FSHIFT;
46
47 #define CT_TO_SECS(x) ((x) / HZ)
48 #define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ)
49
50 extern int nr_running, nr_tasks;
51
52 #define FIRST_TASK task[0]
53 #define LAST_TASK task[NR_TASKS-1]
54
55 #include <linux/head.h>
56 #include <linux/fs.h>
57 #include <linux/signal.h>
58 #include <linux/time.h>
59 #include <linux/param.h>
60 #include <linux/resource.h>
61 #include <linux/vm86.h>
62 #include <linux/math_emu.h>
63 #include <linux/ptrace.h>
64
65 #include <asm/processor.h>
66
67 #define TASK_RUNNING 0
68 #define TASK_INTERRUPTIBLE 1
69 #define TASK_UNINTERRUPTIBLE 2
70 #define TASK_ZOMBIE 3
71 #define TASK_STOPPED 4
72 #define TASK_SWAPPING 5
73
74 #ifndef NULL
75 #define NULL ((void *) 0)
76 #endif
77
78 #ifdef __KERNEL__
79
80 #define barrier() __asm__("": : :"memory")
81
82 extern void sched_init(void);
83 extern void show_state(void);
84 extern void trap_init(void);
85
86 asmlinkage void schedule(void);
87
88 #endif
89
90 struct files_struct {
91 int count;
92 fd_set close_on_exec;
93 struct file * fd[NR_OPEN];
94 };
95
96 #define INIT_FILES { \
97 0, \
98 { { 0, } }, \
99 { NULL, } \
100 }
101
102 struct fs_struct {
103 int count;
104 unsigned short umask;
105 struct inode * root, * pwd;
106 };
107
108 #define INIT_FS { \
109 0, \
110 0022, \
111 NULL, NULL \
112 }
113
114 struct mm_struct {
115 int count;
116 unsigned long start_code, end_code, start_data, end_data;
117 unsigned long start_brk, brk, start_stack, start_mmap;
118 unsigned long arg_start, arg_end, env_start, env_end;
119 unsigned long rss;
120 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
121 int swappable:1;
122 unsigned long swap_address;
123 unsigned long old_maj_flt;
124 unsigned long dec_flt;
125 unsigned long swap_cnt;
126 struct vm_area_struct * mmap;
127 struct vm_area_struct * mmap_avl;
128 };
129
130 #define INIT_MM { \
131 0, \
132 0, 0, 0, 0, \
133 0, 0, 0, 0, \
134 0, 0, 0, 0, \
135 0, \
136 0, 0, 0, 0, \
137 0, \
138 0, 0, 0, 0, \
139 &init_mmap, &init_mmap }
140
141 struct task_struct {
142
143 volatile long state;
144 long counter;
145 long priority;
146 unsigned long signal;
147 unsigned long blocked;
148 unsigned long flags;
149 int errno;
150 int debugreg[8];
151 struct exec_domain *exec_domain;
152
153 struct linux_binfmt *binfmt;
154 struct task_struct *next_task, *prev_task;
155 struct task_struct *next_run, *prev_run;
156 struct sigaction sigaction[32];
157 unsigned long saved_kernel_stack;
158 unsigned long kernel_stack_page;
159 int exit_code, exit_signal;
160 unsigned long personality;
161 int dumpable:1;
162 int did_exec:1;
163 int pid,pgrp,tty_old_pgrp,session,leader;
164 int groups[NGROUPS];
165
166
167
168
169
170 struct task_struct *p_opptr, *p_pptr, *p_cptr, *p_ysptr, *p_osptr;
171 struct wait_queue *wait_chldexit;
172 unsigned short uid,euid,suid,fsuid;
173 unsigned short gid,egid,sgid,fsgid;
174 unsigned long timeout;
175 unsigned long it_real_value, it_prof_value, it_virt_value;
176 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
177 long utime, stime, cutime, cstime, start_time;
178 struct rlimit rlim[RLIM_NLIMITS];
179 unsigned short used_math;
180 char comm[16];
181
182 int link_count;
183 struct tty_struct *tty;
184
185 struct sem_undo *semundo;
186 struct sem_queue *semsleeping;
187
188 struct desc_struct *ldt;
189
190 struct thread_struct tss;
191
192 struct fs_struct fs[1];
193
194 struct files_struct files[1];
195
196 struct mm_struct mm[1];
197 };
198
199
200
201
202 #define PF_ALIGNWARN 0x00000001
203
204 #define PF_PTRACED 0x00000010
205 #define PF_TRACESYS 0x00000020
206
207 #define PF_STARTING 0x00000100
208 #define PF_EXITING 0x00000200
209
210
211
212
213 #define CSIGNAL 0x000000ff
214 #define COPYVM 0x00000100
215 #define COPYFD 0x00000200
216
217
218
219
220
221 #define _STK_LIM (8*1024*1024)
222
223
224
225
226
227 #define INIT_TASK \
228 { 0,15*HZ/100,15*HZ/100,0,0,0,0, \
229 { 0, }, \
230 &default_exec_domain, \
231 NULL, \
232 &init_task,&init_task, &init_task, &init_task, \
233 {{ 0, },}, \
234 0,(unsigned long) &init_kernel_stack, \
235 0,0,0,0,0, \
236 0,0,0,0,0, \
237 {NOGROUP,}, \
238 &init_task,&init_task,NULL,NULL,NULL,NULL, \
239 0,0,0,0,0,0,0,0, \
240 0,0,0,0,0,0,0,0,0,0,0,0, \
241 { {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX}, \
242 {LONG_MAX, LONG_MAX}, {_STK_LIM, _STK_LIM}, \
243 { 0, LONG_MAX}, {LONG_MAX, LONG_MAX}, \
244 {MAX_TASKS_PER_USER, MAX_TASKS_PER_USER}, {NR_OPEN, NR_OPEN}}, \
245 0, \
246 "swapper", \
247 0,NULL, \
248 NULL, NULL, \
249 NULL, \
250 INIT_TSS, \
251 { INIT_FS }, \
252 { INIT_FILES }, \
253 { INIT_MM } \
254 }
255
256 #ifdef __KERNEL__
257
258 extern struct task_struct init_task;
259 extern struct task_struct *task[NR_TASKS];
260 extern struct task_struct *last_task_used_math;
261 extern struct task_struct *current;
262 extern unsigned long volatile jiffies;
263 extern unsigned long itimer_ticks;
264 extern unsigned long itimer_next;
265 extern struct timeval xtime;
266 extern int need_resched;
267
268 #define CURRENT_TIME (xtime.tv_sec)
269
270 extern void sleep_on(struct wait_queue ** p);
271 extern void interruptible_sleep_on(struct wait_queue ** p);
272 extern void wake_up(struct wait_queue ** p);
273 extern void wake_up_interruptible(struct wait_queue ** p);
274
275 extern void notify_parent(struct task_struct * tsk);
276 extern int send_sig(unsigned long sig,struct task_struct * p,int priv);
277 extern int in_group_p(gid_t grp);
278
279 extern int request_irq(unsigned int irq,void (*handler)(int, struct pt_regs *),
280 unsigned long flags, const char *device);
281 extern void free_irq(unsigned int irq);
282
283 extern void copy_thread(int, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
284 extern void flush_thread(void);
285 extern void exit_thread(void);
286
287 extern int do_execve(char *, char **, char **, struct pt_regs *);
288 extern int do_fork(unsigned long, unsigned long, struct pt_regs *);
289
290
291
292
293
294
295 extern inline void add_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
296 {
297 unsigned long flags;
298
299 #ifdef DEBUG
300 if (wait->next) {
301 __label__ here;
302 unsigned long pc;
303 pc = (unsigned long) &&here;
304 here:
305 printk("add_wait_queue (%08lx): wait->next = %08lx\n",pc,(unsigned long) wait->next);
306 }
307 #endif
308 save_flags(flags);
309 cli();
310 if (!*p) {
311 wait->next = wait;
312 *p = wait;
313 } else {
314 wait->next = (*p)->next;
315 (*p)->next = wait;
316 }
317 restore_flags(flags);
318 }
319
320 extern inline void remove_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
321 {
322 unsigned long flags;
323 struct wait_queue * tmp;
324 #ifdef DEBUG
325 unsigned long ok = 0;
326 #endif
327
328 save_flags(flags);
329 cli();
330 if ((*p == wait) &&
331 #ifdef DEBUG
332 (ok = 1) &&
333 #endif
334 ((*p = wait->next) == wait)) {
335 *p = NULL;
336 } else {
337 tmp = wait;
338 while (tmp->next != wait) {
339 tmp = tmp->next;
340 #ifdef DEBUG
341 if (tmp == *p)
342 ok = 1;
343 #endif
344 }
345 tmp->next = wait->next;
346 }
347 wait->next = NULL;
348 restore_flags(flags);
349 #ifdef DEBUG
350 if (!ok) {
351 __label__ here;
352 ok = (unsigned long) &&here;
353 printk("removed wait_queue not on list.\n");
354 printk("list = %08lx, queue = %08lx\n",(unsigned long) p, (unsigned long) wait);
355 here:
356 printk("eip = %08lx\n",ok);
357 }
358 #endif
359 }
360
361 extern inline void select_wait(struct wait_queue ** wait_address, select_table * p)
362 {
363 struct select_table_entry * entry;
364
365 if (!p || !wait_address)
366 return;
367 if (p->nr >= __MAX_SELECT_TABLE_ENTRIES)
368 return;
369 entry = p->entry + p->nr;
370 entry->wait_address = wait_address;
371 entry->wait.task = current;
372 entry->wait.next = NULL;
373 add_wait_queue(wait_address,&entry->wait);
374 p->nr++;
375 }
376
377 extern void __down(struct semaphore * sem);
378
379
380
381
382 extern inline void down(struct semaphore * sem)
383 {
384 if (sem->count <= 0)
385 __down(sem);
386 sem->count--;
387 }
388
389 extern inline void up(struct semaphore * sem)
390 {
391 sem->count++;
392 wake_up(&sem->wait);
393 }
394
395 #define REMOVE_LINKS(p) do { unsigned long flags; \
396 save_flags(flags) ; cli(); \
397 (p)->next_task->prev_task = (p)->prev_task; \
398 (p)->prev_task->next_task = (p)->next_task; \
399 restore_flags(flags); \
400 if ((p)->p_osptr) \
401 (p)->p_osptr->p_ysptr = (p)->p_ysptr; \
402 if ((p)->p_ysptr) \
403 (p)->p_ysptr->p_osptr = (p)->p_osptr; \
404 else \
405 (p)->p_pptr->p_cptr = (p)->p_osptr; \
406 } while (0)
407
408 #define SET_LINKS(p) do { unsigned long flags; \
409 save_flags(flags); cli(); \
410 (p)->next_task = &init_task; \
411 (p)->prev_task = init_task.prev_task; \
412 init_task.prev_task->next_task = (p); \
413 init_task.prev_task = (p); \
414 restore_flags(flags); \
415 (p)->p_ysptr = NULL; \
416 if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
417 (p)->p_osptr->p_ysptr = p; \
418 (p)->p_pptr->p_cptr = p; \
419 } while (0)
420
421 #define for_each_task(p) \
422 for (p = &init_task ; (p = p->next_task) != &init_task ; )
423
424 #endif
425
426 #endif