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
184 struct desc_struct *ldt;
185
186 struct thread_struct tss;
187
188 struct fs_struct fs[1];
189
190 struct files_struct files[1];
191
192 struct mm_struct mm[1];
193 };
194
195
196
197
198 #define PF_ALIGNWARN 0x00000001
199
200 #define PF_PTRACED 0x00000010
201 #define PF_TRACESYS 0x00000020
202
203
204
205
206 #define CSIGNAL 0x000000ff
207 #define COPYVM 0x00000100
208 #define COPYFD 0x00000200
209
210
211
212
213
214 #define INIT_TASK \
215 { 0,15,15,0,0,0,0, \
216 { 0, }, \
217 &default_exec_domain, \
218 NULL, \
219 &init_task,&init_task, \
220 {{ 0, },}, \
221 0,(unsigned long) &init_kernel_stack, \
222 0,0,0,0,0, \
223 0,0,0,0,0, \
224 {NOGROUP,}, \
225 &init_task,&init_task,NULL,NULL,NULL,NULL, \
226 0,0,0,0,0,0,0,0, \
227 0,0,0,0,0,0,0,0,0,0,0,0, \
228 { {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX}, \
229 {LONG_MAX, LONG_MAX}, {LONG_MAX, LONG_MAX}, \
230 { 0, LONG_MAX}, {LONG_MAX, LONG_MAX}}, \
231 0, \
232 "swapper", \
233 0,NULL, \
234 NULL, \
235 NULL, \
236 INIT_TSS, \
237 { INIT_FS }, \
238 { INIT_FILES }, \
239 { INIT_MM } \
240 }
241
242 #ifdef __KERNEL__
243
244 extern struct task_struct init_task;
245 extern struct task_struct *task[NR_TASKS];
246 extern struct task_struct *last_task_used_math;
247 extern struct task_struct *current;
248 extern unsigned long volatile jiffies;
249 extern unsigned long itimer_ticks;
250 extern unsigned long itimer_next;
251 extern struct timeval xtime;
252 extern int need_resched;
253
254 #define CURRENT_TIME (xtime.tv_sec)
255
256 extern void sleep_on(struct wait_queue ** p);
257 extern void interruptible_sleep_on(struct wait_queue ** p);
258 extern void wake_up(struct wait_queue ** p);
259 extern void wake_up_interruptible(struct wait_queue ** p);
260
261 extern void notify_parent(struct task_struct * tsk);
262 extern int send_sig(unsigned long sig,struct task_struct * p,int priv);
263 extern int in_group_p(gid_t grp);
264
265 extern int request_irq(unsigned int irq,void (*handler)(int, struct pt_regs *),
266 unsigned long flags, const char *device);
267 extern void free_irq(unsigned int irq);
268
269 extern unsigned long copy_thread(int, unsigned long, struct task_struct *, struct pt_regs *);
270 extern void start_thread(struct pt_regs *, unsigned long pc, unsigned long sp);
271 extern void flush_thread(void);
272 extern void exit_thread(void);
273
274 extern int do_execve(char *, char **, char **, struct pt_regs *);
275 asmlinkage int do_signal(unsigned long, struct pt_regs *);
276
277
278
279
280
281
282 extern inline void add_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
283 {
284 unsigned long flags;
285
286 #ifdef DEBUG
287 if (wait->next) {
288 unsigned long pc;
289 __asm__ __volatile__("call 1f\n"
290 "1:\tpopl %0":"=r" (pc));
291 printk("add_wait_queue (%08x): wait->next = %08x\n",pc,(unsigned long) wait->next);
292 }
293 #endif
294 save_flags(flags);
295 cli();
296 if (!*p) {
297 wait->next = wait;
298 *p = wait;
299 } else {
300 wait->next = (*p)->next;
301 (*p)->next = wait;
302 }
303 restore_flags(flags);
304 }
305
306 extern inline void remove_wait_queue(struct wait_queue ** p, struct wait_queue * wait)
307 {
308 unsigned long flags;
309 struct wait_queue * tmp;
310 #ifdef DEBUG
311 unsigned long ok = 0;
312 #endif
313
314 save_flags(flags);
315 cli();
316 if ((*p == wait) &&
317 #ifdef DEBUG
318 (ok = 1) &&
319 #endif
320 ((*p = wait->next) == wait)) {
321 *p = NULL;
322 } else {
323 tmp = wait;
324 while (tmp->next != wait) {
325 tmp = tmp->next;
326 #ifdef DEBUG
327 if (tmp == *p)
328 ok = 1;
329 #endif
330 }
331 tmp->next = wait->next;
332 }
333 wait->next = NULL;
334 restore_flags(flags);
335 #ifdef DEBUG
336 if (!ok) {
337 printk("removed wait_queue not on list.\n");
338 printk("list = %08x, queue = %08x\n",(unsigned long) p, (unsigned long) wait);
339 __asm__("call 1f\n1:\tpopl %0":"=r" (ok));
340 printk("eip = %08x\n",ok);
341 }
342 #endif
343 }
344
345 extern inline void select_wait(struct wait_queue ** wait_address, select_table * p)
346 {
347 struct select_table_entry * entry;
348
349 if (!p || !wait_address)
350 return;
351 if (p->nr >= __MAX_SELECT_TABLE_ENTRIES)
352 return;
353 entry = p->entry + p->nr;
354 entry->wait_address = wait_address;
355 entry->wait.task = current;
356 entry->wait.next = NULL;
357 add_wait_queue(wait_address,&entry->wait);
358 p->nr++;
359 }
360
361 extern void __down(struct semaphore * sem);
362
363
364
365
366 extern inline void down(struct semaphore * sem)
367 {
368 if (sem->count <= 0)
369 __down(sem);
370 sem->count--;
371 }
372
373 extern inline void up(struct semaphore * sem)
374 {
375 sem->count++;
376 wake_up(&sem->wait);
377 }
378
379 #define REMOVE_LINKS(p) do { unsigned long flags; \
380 save_flags(flags) ; cli(); \
381 (p)->next_task->prev_task = (p)->prev_task; \
382 (p)->prev_task->next_task = (p)->next_task; \
383 restore_flags(flags); \
384 if ((p)->p_osptr) \
385 (p)->p_osptr->p_ysptr = (p)->p_ysptr; \
386 if ((p)->p_ysptr) \
387 (p)->p_ysptr->p_osptr = (p)->p_osptr; \
388 else \
389 (p)->p_pptr->p_cptr = (p)->p_osptr; \
390 } while (0)
391
392 #define SET_LINKS(p) do { unsigned long flags; \
393 save_flags(flags); cli(); \
394 (p)->next_task = &init_task; \
395 (p)->prev_task = init_task.prev_task; \
396 init_task.prev_task->next_task = (p); \
397 init_task.prev_task = (p); \
398 restore_flags(flags); \
399 (p)->p_ysptr = NULL; \
400 if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \
401 (p)->p_osptr->p_ysptr = p; \
402 (p)->p_pptr->p_cptr = p; \
403 } while (0)
404
405 #define for_each_task(p) \
406 for (p = &init_task ; (p = p->next_task) != &init_task ; )
407
408 #endif
409
410 #endif