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/* $Id$ */
/***
This file is part of PulseAudio.
PulseAudio 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.
PulseAudio 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
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdio.h>
#include <windows.h>
#include <pulsecore/mutex.h>
#include "once.h"
void pa_once(pa_once_t *control, pa_once_func_t func) {
HANDLE mutex;
char name[64];
assert(control);
assert(func);
/* Create the global mutex */
sprintf(name, "pulse%d", (int)GetCurrentProcessId());
mutex = CreateMutex(NULL, FALSE, name);
assert(mutex);
/* Create the local mutex */
WaitForSingleObject(mutex, INFINITE);
if (!control->mutex)
control->mutex = pa_mutex_new(1);
ReleaseMutex(mutex);
CloseHandle(mutex);
/* Execute function */
pa_mutex_lock(control->mutex);
if (!control->once_value) {
control->once_value = 1;
func();
}
pa_mutex_unlock(control->mutex);
/* Caveat: We have to make sure that the once func has completed
* before returning, even if the once func is not actually
* executed by us. Hence the awkward locking. */
}
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