mirror of
https://github.com/libretro/pcsx2.git
synced 2024-12-13 21:28:38 +00:00
4457fe40fc
git-svn-id: http://pcsx2.googlecode.com/svn/trunk@2897 96395faa-99c1-11dd-bbfe-3dabce05a288
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
|
|
* -------------------------------------------------------------
|
|
*
|
|
* Module: sem_getvalue.c
|
|
*
|
|
* Purpose:
|
|
* Semaphores aren't actually part of PThreads.
|
|
* They are defined by the POSIX Standard:
|
|
*
|
|
* POSIX 1003.1-2001
|
|
*
|
|
* -------------------------------------------------------------
|
|
*
|
|
* --------------------------------------------------------------------------
|
|
*
|
|
* Pthreads-win32 - POSIX Threads Library for Win32
|
|
* Copyright(C) 1998 John E. Bossom
|
|
* Copyright(C) 1999,2005 Pthreads-win32 contributors
|
|
*
|
|
* Contact Email: rpj@callisto.canberra.edu.au
|
|
*
|
|
* The current list of contributors is contained
|
|
* in the file CONTRIBUTORS included with the source
|
|
* code distribution. The list can also be seen at the
|
|
* following World Wide Web location:
|
|
* http://sources.redhat.com/pthreads-win32/contributors.html
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library in the file COPYING.LIB;
|
|
* if not, write to the Free Software Foundation, Inc.,
|
|
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
*/
|
|
|
|
#include "ptw32pch.h"
|
|
#include "semaphore.h"
|
|
|
|
|
|
int
|
|
sem_getvalue (sem_t * sem, int *sval)
|
|
/*
|
|
* ------------------------------------------------------
|
|
* DOCPUBLIC
|
|
* This function stores the current count value of the
|
|
* semaphore.
|
|
* RESULTS
|
|
*
|
|
* Return value
|
|
*
|
|
* 0 sval has been set.
|
|
* -1 failed, error in errno
|
|
*
|
|
* in global errno
|
|
*
|
|
* EINVAL 'sem' is not a valid semaphore,
|
|
* ENOSYS this function is not supported,
|
|
*
|
|
*
|
|
* PARAMETERS
|
|
*
|
|
* sem pointer to an instance of sem_t
|
|
*
|
|
* sval pointer to int.
|
|
*
|
|
* DESCRIPTION
|
|
* This function stores the current count value of the semaphore
|
|
* pointed to by sem in the int pointed to by sval.
|
|
*/
|
|
{
|
|
if (sem == NULL || *sem == NULL || sval == NULL)
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
else
|
|
{
|
|
long value;
|
|
register sem_t s = *sem;
|
|
int result = 0;
|
|
|
|
if ((result = pthread_mutex_lock(&s->lock)) == 0)
|
|
{
|
|
/* See sem_destroy.c
|
|
*/
|
|
if (*sem == NULL)
|
|
{
|
|
(void) pthread_mutex_unlock (&s->lock);
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
value = s->value;
|
|
(void) pthread_mutex_unlock(&s->lock);
|
|
*sval = value;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
} /* sem_getvalue */
|