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1 | /* Copyright (C) 2002 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
18 | ||
19 | #ifndef _SEMAPHORE_H | |
20 | #define _SEMAPHORE_H 1 | |
21 | ||
22 | #include <features.h> | |
23 | #include <sys/types.h> | |
24 | #ifdef __USE_XOPEN2K | |
25 | # define __need_timespec | |
26 | # include <time.h> | |
27 | #endif | |
28 | ||
29 | /* Get the definition for sem_t. */ | |
30 | #include <bits/semaphore.h> | |
31 | ||
32 | ||
33 | __BEGIN_DECLS | |
34 | ||
35 | /* Initialize semaphore object SEM to VALUE. If PSHARED then share it | |
36 | with other processes. */ | |
37 | extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value) | |
38 | __THROW; | |
39 | /* Free resources associated with semaphore object SEM. */ | |
40 | extern int sem_destroy (sem_t *__sem) __THROW; | |
41 | ||
42 | /* Open a named semaphore NAME with open flaot OFLAG. */ | |
43 | extern sem_t *sem_open (__const char *__name, int __oflag, ...) __THROW; | |
44 | ||
45 | /* Close descriptor for named semaphore SEM. */ | |
46 | extern int sem_close (sem_t *__sem) __THROW; | |
47 | ||
48 | /* Remove named semaphore NAME. */ | |
49 | extern int sem_unlink (__const char *__name) __THROW; | |
50 | ||
51 | /* Wait for SEM being posted. */ | |
52 | extern int sem_wait (sem_t *__sem) __THROW; | |
53 | ||
54 | #ifdef __USE_XOPEN2K | |
55 | /* Similar to `sem_wait' but wait only until ABSTIME. */ | |
56 | extern int sem_timedwait (sem_t *__restrict __sem, | |
57 | __const struct timespec *__restrict __abstime) | |
58 | __THROW; | |
59 | #endif | |
60 | ||
61 | /* Test whether SEM is posted. */ | |
62 | extern int sem_trywait (sem_t *__sem) __THROW; | |
63 | ||
64 | /* Post SEM. */ | |
65 | extern int sem_post (sem_t *__sem) __THROW; | |
66 | ||
67 | /* Get current value of SEM and store it in *SVAL. */ | |
68 | extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval) | |
69 | __THROW; | |
70 | ||
71 | ||
72 | __END_DECLS | |
73 | ||
74 | #endif /* semaphore.h */ |