mirror of
https://github.com/libretro/pcsx2.git
synced 2024-12-14 05:38:51 +00:00
93 lines
3.2 KiB
C
93 lines
3.2 KiB
C
/*
|
|
* ptw32_mutex_check_need_init.c
|
|
*
|
|
* Description:
|
|
* This translation unit implements mutual exclusion (mutex) primitives.
|
|
*
|
|
* --------------------------------------------------------------------------
|
|
*
|
|
* 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 "pthread.h"
|
|
#include "implement.h"
|
|
|
|
static struct pthread_mutexattr_t_ ptw32_recursive_mutexattr_s =
|
|
{PTHREAD_PROCESS_PRIVATE, PTHREAD_MUTEX_RECURSIVE};
|
|
static struct pthread_mutexattr_t_ ptw32_errorcheck_mutexattr_s =
|
|
{PTHREAD_PROCESS_PRIVATE, PTHREAD_MUTEX_ERRORCHECK};
|
|
static pthread_mutexattr_t ptw32_recursive_mutexattr = &ptw32_recursive_mutexattr_s;
|
|
static pthread_mutexattr_t ptw32_errorcheck_mutexattr = &ptw32_errorcheck_mutexattr_s;
|
|
|
|
|
|
INLINE int
|
|
ptw32_mutex_check_need_init (pthread_mutex_t * mutex)
|
|
{
|
|
register int result = 0;
|
|
register pthread_mutex_t mtx;
|
|
ptw32_mcs_local_node_t node;
|
|
|
|
ptw32_mcs_lock_acquire(&ptw32_mutex_test_init_lock, &node);
|
|
|
|
/*
|
|
* We got here possibly under race
|
|
* conditions. Check again inside the critical section
|
|
* and only initialise if the mutex is valid (not been destroyed).
|
|
* If a static mutex has been destroyed, the application can
|
|
* re-initialise it only by calling pthread_mutex_init()
|
|
* explicitly.
|
|
*/
|
|
mtx = *mutex;
|
|
|
|
if (mtx == PTHREAD_MUTEX_INITIALIZER)
|
|
{
|
|
result = pthread_mutex_init (mutex, NULL);
|
|
}
|
|
else if (mtx == PTHREAD_RECURSIVE_MUTEX_INITIALIZER)
|
|
{
|
|
result = pthread_mutex_init (mutex, &ptw32_recursive_mutexattr);
|
|
}
|
|
else if (mtx == PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
|
|
{
|
|
result = pthread_mutex_init (mutex, &ptw32_errorcheck_mutexattr);
|
|
}
|
|
else if (mtx == NULL)
|
|
{
|
|
/*
|
|
* The mutex has been destroyed while we were waiting to
|
|
* initialise it, so the operation that caused the
|
|
* auto-initialisation should fail.
|
|
*/
|
|
result = EINVAL;
|
|
}
|
|
|
|
ptw32_mcs_lock_release(&node);
|
|
|
|
return (result);
|
|
}
|