default: esd is obsolete, hence don't load it anymore by default
[pulseaudio-mirror.git] / src / pulsecore / semaphore-posix.c
blob2aa1bce906fe0634136b9fcc724dfc854e71ccc4
1 /***
2 This file is part of PulseAudio.
4 Copyright 2006 Lennart Poettering
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2.1 of the License,
9 or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19 USA.
20 ***/
22 #ifdef HAVE_CONFIG_H
23 #include <config.h>
24 #endif
26 #include <errno.h>
27 #include <pthread.h>
28 #include <semaphore.h>
30 #include <pulse/xmalloc.h>
31 #include <pulsecore/macro.h>
33 #include "semaphore.h"
35 struct pa_semaphore {
36 sem_t sem;
39 pa_semaphore* pa_semaphore_new(unsigned value) {
40 pa_semaphore *s;
42 s = pa_xnew(pa_semaphore, 1);
43 pa_assert_se(sem_init(&s->sem, 0, value) == 0);
44 return s;
47 void pa_semaphore_free(pa_semaphore *s) {
48 pa_assert(s);
49 pa_assert_se(sem_destroy(&s->sem) == 0);
50 pa_xfree(s);
53 void pa_semaphore_post(pa_semaphore *s) {
54 pa_assert(s);
55 pa_assert_se(sem_post(&s->sem) == 0);
58 void pa_semaphore_wait(pa_semaphore *s) {
59 int ret;
60 pa_assert(s);
62 do {
63 ret = sem_wait(&s->sem);
64 } while (ret < 0 && errno == EINTR);
66 pa_assert(ret == 0);
69 pa_semaphore* pa_static_semaphore_get(pa_static_semaphore *s, unsigned value) {
70 pa_semaphore *m;
72 pa_assert(s);
74 /* First, check if already initialized and short cut */
75 if ((m = pa_atomic_ptr_load(&s->ptr)))
76 return m;
78 /* OK, not initialized, so let's allocate, and fill in */
79 m = pa_semaphore_new(value);
80 if ((pa_atomic_ptr_cmpxchg(&s->ptr, NULL, m)))
81 return m;
83 pa_semaphore_free(m);
85 /* Him, filling in failed, so someone else must have filled in
86 * already */
87 pa_assert_se(m = pa_atomic_ptr_load(&s->ptr));
88 return m;