mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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5effc83479
FSF addresses used in PA sources are no longer valid and rpmlint generates numerous warnings during packaging because of this. This patch changes all FSF addresses to FSF web page according to the GPL how-to: https://www.gnu.org/licenses/gpl-howto.en.html Done automatically by sed-ing through sources.
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2006 Lennart Poettering
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <pulsecore/macro.h>
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#include "once.h"
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/* See http://www.hpl.hp.com/research/linux/atomic_ops/example.php4 for the
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* reference algorithm used here. */
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bool pa_once_begin(pa_once *control) {
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pa_mutex *m;
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pa_assert(control);
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if (pa_atomic_load(&control->done))
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return false;
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/* Caveat: We have to make sure that the once func has completed
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* before returning, even if the once func is not actually
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* executed by us. Hence the awkward locking. */
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m = pa_static_mutex_get(&control->mutex, false, false);
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pa_mutex_lock(m);
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if (pa_atomic_load(&control->done)) {
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pa_mutex_unlock(m);
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return false;
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}
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return true;
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}
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void pa_once_end(pa_once *control) {
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pa_mutex *m;
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pa_assert(control);
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pa_assert(!pa_atomic_load(&control->done));
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pa_atomic_store(&control->done, 1);
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m = pa_static_mutex_get(&control->mutex, false, false);
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pa_mutex_unlock(m);
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}
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/* Not reentrant -- how could it be? */
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void pa_run_once(pa_once *control, pa_once_func_t func) {
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pa_assert(control);
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pa_assert(func);
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if (pa_once_begin(control)) {
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func();
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pa_once_end(control);
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}
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}
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