2
* -------------------------------------------------------------
7
* Semaphores aren't actually part of the PThreads standard.
8
* They are defined by the POSIX Standard:
10
* POSIX 1003.1b-1993 (POSIX.1b)
12
* -------------------------------------------------------------
14
* --------------------------------------------------------------------------
16
* Pthreads-win32 - POSIX Threads Library for Win32
17
* Copyright(C) 1998 John E. Bossom
18
* Copyright(C) 1999,2005 Pthreads-win32 contributors
20
* Contact Email: rpj@callisto.canberra.edu.au
22
* The current list of contributors is contained
23
* in the file CONTRIBUTORS included with the source
24
* code distribution. The list can also be seen at the
25
* following World Wide Web location:
26
* http://sources.redhat.com/pthreads-win32/contributors.html
28
* This library is free software; you can redistribute it and/or
29
* modify it under the terms of the GNU Lesser General Public
30
* License as published by the Free Software Foundation; either
31
* version 2 of the License, or (at your option) any later version.
33
* This library is distributed in the hope that it will be useful,
34
* but WITHOUT ANY WARRANTY; without even the implied warranty of
35
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
36
* Lesser General Public License for more details.
38
* You should have received a copy of the GNU Lesser General Public
39
* License along with this library in the file COPYING.LIB;
40
* if not, write to the Free Software Foundation, Inc.,
41
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
45
#include "semaphore.h"
46
#include "implement.h"
50
sem_post (sem_t * sem)
52
* ------------------------------------------------------
54
* This function posts a wakeup to a semaphore.
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* pointer to an instance of sem_t
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* This function posts a wakeup to a semaphore. If there
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* are waiting threads (or processes), one is awakened;
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* otherwise, the semaphore value is incremented by one.
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* 0 successfully posted semaphore,
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* -1 failed, error in errno
69
* EINVAL 'sem' is not a valid semaphore,
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* ENOSYS semaphores are not supported,
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* ERANGE semaphore count is too big
73
* ------------------------------------------------------
83
else if ((result = pthread_mutex_lock (&s->lock)) == 0)
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(void) pthread_mutex_unlock (&s->lock);
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if (s->value < SEM_VALUE_MAX)
105
&& !ReleaseSemaphore (s->sem, 1, NULL))
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#endif /* NEED_SEM */
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(void) pthread_mutex_unlock (&s->lock);