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 #define FIRST_TASK task[0]
51 #define LAST_TASK task[NR_TASKS-1]
52
53 #include <linux/head.h>
54 #include <linux/fs.h>
55 #include <linux/signal.h>
56 #include <linux/time.h>
57 #include <linux/param.h>
58 #include <linux/resource.h>
59 #include <linux/vm86.h>
60 #include <linux/math_emu.h>
61 #include <linux/ptrace.h>
62
63 #include <asm/processor.h>
64
65 #define TASK_RUNNING 0
66 #define TASK_INTERRUPTIBLE 1
67 #define TASK_UNINTERRUPTIBLE 2
68 #define TASK_ZOMBIE 3
69 #define TASK_STOPPED 4
70 #define TASK_SWAPPING 5
71
72 #ifndef NULL
73 #define NULL ((void *) 0)
74 #endif
75
76 #ifdef __KERNEL__
77
78 extern void sched_init(void);
79 extern void show_state(void);
80 extern void trap_init(void);
81
82 asmlinkage void schedule(void);
83
84 #endif
85
86 struct files_struct {
87 int count;
88 fd_set close_on_exec;
89 struct file * fd[NR_OPEN];
90 };
91
92 #define INIT_FILES { \
93 0, \
94 { { 0, } }, \
95 { NULL, } \
96 }
97
98 struct fs_struct {
99 int count;
100 unsigned short umask;
101 struct inode * root, * pwd;
102 };
103
104 #define INIT_FS { \
105 0, \
106 0022, \
107 NULL, NULL \
108 }
109
110 struct mm_struct {
111 int count;
112 unsigned long start_code, end_code, end_data;
113 unsigned long start_brk, brk, start_stack, start_mmap;
114 unsigned long arg_start, arg_end, env_start, env_end;
115 unsigned long rss;
116 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
117 int swappable:1;
118 unsigned long swap_address;
119 unsigned long old_maj_flt;
120 unsigned long dec_flt;
121 unsigned long swap_cnt;
122 struct vm_area_struct * mmap;
123 struct vm_area_struct * mmap_avl;
124 };
125
126 #define INIT_MMAP { &init_task, 0, 0x40000000, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC }
127
128 #define INIT_MM { \
129 0, \
130 0, 0, 0, \
131 0, 0, 0, 0, \
132 0, 0, 0, 0, \
133 0, \
134 0, 0, 0, 0, \
135 0, \
136 0, 0, 0, 0, \
137 &init_mmap, &init_mmap }
138
139 struct task_struct {
140
141 volatile long state;
142 long counter;
143 long priority;
144 unsigned long signal;
145 unsigned long blocked;
146 unsigned long flags;
147 int errno;
148 int debugreg[8];
149 struct exec_domain *exec_domain;
150
151 struct linux_binfmt *binfmt;
152 struct task_struct *next_task, *prev_task;
153 struct sigaction sigaction[32];
154 unsigned long saved_kernel_stack;
155 unsigned long kernel_stack_page;
156 int exit_code, exit_signal;
157 unsigned long personality;
158 int dumpable:1;
159 int did_exec:1;
160 int pid,pgrp,tty_old_pgrp,session,leader;
161 int groups[NGROUPS];
162
163
164
165
166
167 struct task_struct *p_opptr, *p_pptr, *p_cptr, *p_ysptr, *p_osptr;
168 struct wait_queue *wait_chldexit;
169 unsigned short uid,euid,suid,fsuid;
170 unsigned short gid,egid,sgid,fsgid;
171 unsigned long timeout;
172 unsigned long it_real_value, it_prof_value, it_virt_value;
173 unsigned long it_real_incr, it_prof_incr, it_virt_incr;
174 long utime, stime, cutime, cstime, start_time;
175 struct rlimit rlim[RLIM_NLIMITS];
176 unsigned short used_math;
177 char comm[16];
178
179 int link_count;
180 struct tty_struct *tty;
181
182 struct sem_undo *semundo;
183 struct sem_queue *semsleeping;
184
185 struct desc_struct *ldt;
186
187 struct thread_struct tss;
188
189 struct fs_struct fs[1];
190
191 struct files_struct files[1];
192
193 struct mm_struct mm[1];
194 };
195
196
197
198
199 #define PF_ALIGNWARN 0x00000001
200
201 #define PF_PTRACED 0x00000010
202 #define PF_TRACESYS 0x00000020
203
204
205
206
207 #define CSIGNAL 0x000000ff
208 #define COPYVM 0x00000100
209 #define COPYFD 0x00000200
210
211
212
213
214
215 #define INIT_TASK \
216 { 0,15,15,0,0,0,0, \
217 { 0, }, \
218 &default_exec_domain, \
219 NULL, \
220 &init_task,&init_task, \
221 {{ 0, },}, \
222 0,(unsigned long) &init_kernel_stack, \
223 0,0,0,0,0, \
224 0,0,0,0,0, \
225 {NOGROUP,}, \
226 &init_task,&init_task,NULL,NULL,NULL,NULL, \
227 0,0,0,0,0,0,0,0, \
228 0,0,0,0,0,0,0,0,0,0,0,0, \
229 { {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX}, \
230 {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX}, \
231 { 0, LONG_MAX}, {LONG_MAX, LONG_MAX}, \
232 {MAX_TASKS_PER_USER, MAX_TASKS_PER_USER}, {NR_OPEN, NR_OPEN}}, \
233 0, \
234 "swapper", \
235 0,NULL, \
236 NULL, NULL, \
237 NULL, \
238 INIT_TSS, \
239 { INIT_FS }, \
240 { INIT_FILES }, \
241 { INIT_MM } \
242 }
243
244 #ifdef __KERNEL__
245
246 extern struct task_struct init_task;
247 extern struct task_struct *task[NR_TASKS];
248 extern struct task_struct *last_task_used_math;
249 extern struct task_struct *current;
250 extern unsigned long volatile jiffies;
251 extern unsigned long itimer_ticks;
252 extern unsigned long itimer_next;
253 extern struct timeval xtime;
254 extern int need_resched;
255
256 #define CURRENT_TIME (xtime.tv_sec)
257
258 extern void sleep_on(struct wait_queue ** p);
259 extern void interruptible_sleep_on(struct wait_queue ** p);
260 extern void wake_up(struct wait_queue ** p);
261 extern void wake_up_interruptible(struct wait_queue ** p);
262
263 extern void notify_parent(struct task_struct * tsk);
264 extern int send_sig(unsigned long sig,struct task_struct * p,int priv);
265 extern int in_group_p(gid_t grp);
266
267 extern int request_irq(unsigned int irq,void (*handler)(int, struct pt_regs *),
268 unsigned long flags, const char *device);
269 extern void free_irq(unsigned int irq);
270
271 extern unsigned long copy_thread(int, unsigned long, struct task_struct *, struct pt_regs *);
272 extern void flush_thread(void);
273 extern void exit_thread(void);
274
275 extern int do_execve(char *, char **, char **, struct pt_regs *);
276 asmlinkage int do_signal(unsigned long, struct pt_regs *);
277
278
279
280
281
282
283 extern inline void add_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
284 {
285 unsigned long flags;
286
287 #ifdef DEBUG
288 if (wait->next) {
289 unsigned long pc;
290 __asm__ __volatile__("call 1f\n"
291 "1:\tpopl %0":"=r" (pc));
292 printk("add_wait_queue (%08x): wait->next = %08x\n",pc,(unsigned long) wait->next);
293 }
294 #endif
295 save_flags(flags);
296 cli();
297 if (!*p) {
298 wait->next = wait;
299 *p = wait;
300 } else {
301 wait->next = (*p)->next;
302 (*p)->next = wait;
303 }
304 restore_flags(flags);
305 }
306
307 extern inline void remove_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
308 {
309 unsigned long flags;
310 struct wait_queue * tmp;
311 #ifdef DEBUG
312 unsigned long ok = 0;
313 #endif
314
315 save_flags(flags);
316 cli();
317 if ((*p == wait) &&
318 #ifdef DEBUG
319 (ok = 1) &&
320 #endif
321 ((*p = wait->next) == wait)) {
322 *p = NULL;
323 } else {
324 tmp = wait;
325 while (tmp->next != wait) {
326 tmp = tmp->next;
327 #ifdef DEBUG
328 if (tmp == *p)
329 ok = 1;
330 #endif
331 }
332 tmp->next = wait->next;
333 }
334 wait->next = NULL;
335 restore_flags(flags);
336 #ifdef DEBUG
337 if (!ok) {
338 printk("removed wait_queue not on list.\n");
339 printk("list = %08x, queue = %08x\n",(unsigned long) p, (unsigned long) wait);
340 __asm__("call 1f\n1:\tpopl %0":"=r" (ok));
341 printk("eip = %08x\n",ok);
342 }
343 #endif
344 }
345
346 extern inline void select_wait(struct wait_queue ** wait_address, select_table * p)
347 {
348 struct select_table_entry * entry;
349
350 if (!p || !wait_address)
351 return;
352 if (p->nr >= __MAX_SELECT_TABLE_ENTRIES)
353 return;
354 entry = p->entry + p->nr;
355 entry->wait_address = wait_address;
356 entry->wait.task = current;
357 entry->wait.next = NULL;
358 add_wait_queue(wait_address,&entry->wait);
359 p->nr++;
360 }
361
362 extern void __down(struct semaphore * sem);
363
364
365
366
367 extern inline void down(struct semaphore * sem)
368 {
369 if (sem->count <= 0)
370 __down(sem);
371 sem->count--;
372 }
373
374 extern inline void up(struct semaphore * sem)
375 {
376 sem->count++;
377 wake_up(&sem->wait);
378 }
379
380 #define REMOVE_LINKS(p) do { unsigned long flags; \
381 save_flags(flags) ; cli(); \
382 (p)->next_task->prev_task = (p)->prev_task; \
383 (p)->prev_task->next_task = (p)->next_task; \
384 restore_flags(flags); \
385 if ((p)->p_osptr) \
386 (p)->p_osptr->p_ysptr = (p)->p_ysptr; \
387 if ((p)->p_ysptr) \
388 (p)->p_ysptr->p_osptr = (p)->p_osptr; \
389 else \
390 (p)->p_pptr->p_cptr = (p)->p_osptr; \
391 } while (0)
392
393 #define SET_LINKS(p) do { unsigned long flags; \
394 save_flags(flags); cli(); \
395 (p)->next_task = &init_task; \
396 (p)->prev_task = init_task.prev_task; \
397 init_task.prev_task->next_task = (p); \
398 init_task.prev_task = (p); \
399 restore_flags(flags); \
400 (p)->p_ysptr = NULL; \
401 if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
402 (p)->p_osptr->p_ysptr = p; \
403 (p)->p_pptr->p_cptr = p; \
404 } while (0)
405
406 #define for_each_task(p) \
407 for (p = &init_task ; (p = p->next_task) != &init_task ; )
408
409 #endif
410
411 #endif