mirror of https://github.com/PCSX2/pcsx2.git
113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/*
|
|
* pthread_spin_destroy.c
|
|
*
|
|
* Description:
|
|
* This translation unit implements spin lock 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"
|
|
|
|
|
|
int
|
|
pthread_spin_destroy (pthread_spinlock_t * lock)
|
|
{
|
|
register pthread_spinlock_t s;
|
|
int result = 0;
|
|
|
|
if (lock == NULL || *lock == NULL)
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
if ((s = *lock) != PTHREAD_SPINLOCK_INITIALIZER)
|
|
{
|
|
if (s->interlock == PTW32_SPIN_USE_MUTEX)
|
|
{
|
|
result = pthread_mutex_destroy (&(s->u.mutex));
|
|
}
|
|
else if ((PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED !=
|
|
PTW32_INTERLOCKED_COMPARE_EXCHANGE ((PTW32_INTERLOCKED_LPLONG)
|
|
& (s->interlock),
|
|
(PTW32_INTERLOCKED_LONG)
|
|
PTW32_OBJECT_INVALID,
|
|
(PTW32_INTERLOCKED_LONG)
|
|
PTW32_SPIN_UNLOCKED))
|
|
{
|
|
result = EINVAL;
|
|
}
|
|
|
|
if (0 == result)
|
|
{
|
|
/*
|
|
* We are relying on the application to ensure that all other threads
|
|
* have finished with the spinlock before destroying it.
|
|
*/
|
|
*lock = NULL;
|
|
(void) free (s);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* See notes in ptw32_spinlock_check_need_init() above also.
|
|
*/
|
|
EnterCriticalSection (&ptw32_spinlock_test_init_lock);
|
|
|
|
/*
|
|
* Check again.
|
|
*/
|
|
if (*lock == PTHREAD_SPINLOCK_INITIALIZER)
|
|
{
|
|
/*
|
|
* This is all we need to do to destroy a statically
|
|
* initialised spinlock that has not yet been used (initialised).
|
|
* If we get to here, another thread
|
|
* waiting to initialise this mutex will get an EINVAL.
|
|
*/
|
|
*lock = NULL;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* The spinlock has been initialised while we were waiting
|
|
* so assume it's in use.
|
|
*/
|
|
result = EBUSY;
|
|
}
|
|
|
|
LeaveCriticalSection (&ptw32_spinlock_test_init_lock);
|
|
}
|
|
|
|
return (result);
|
|
}
|