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01: /* Copyright (C) 2002, 2003, 2011 Free Software Foundation, Inc.
02:    This file is part of the GNU C Library.
03: 
04:    The GNU C Library is free software; you can redistribute it and/or
05:    modify it under the terms of the GNU Lesser General Public
06:    License as published by the Free Software Foundation; either
07:    version 2.1 of the License, or (at your option) any later version.
08: 
09:    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 flags 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: 
53:    This function is a cancellation point and therefore not marked with
54:    __THROW.  */
55: extern int sem_wait (sem_t *__sem);
56: 
57: #ifdef __USE_XOPEN2K
58: /* Similar to `sem_wait' but wait only until ABSTIME.
59: 
60:    This function is a cancellation point and therefore not marked with
61:    __THROW.  */
62: extern int sem_timedwait (sem_t *__restrict __sem,
63:                           __const struct timespec *__restrict __abstime);
64: #endif
65: 
66: /* Test whether SEM is posted.  */
67: extern int sem_trywait (sem_t *__sem) __THROWNL;
68: 
69: /* Post SEM.  */
70: extern int sem_post (sem_t *__sem) __THROWNL;
71: 
72: /* Get current value of SEM and store it in *SVAL.  */
73: extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval)
74:      __THROW;
75: 
76: 
77: __END_DECLS
78: 
79: #endif  /* semaphore.h */
80: 

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