mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-11-10 13:29:58 -05:00
06211b7c8f
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1426 fefdeb5f-60dc-0310-8127-8f9354f1896f
69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/* $Id$ */
|
|
|
|
/***
|
|
This file is part of PulseAudio.
|
|
|
|
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
|
|
|
|
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. */
|
|
}
|