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code.delx.au - pulseaudio/blob - src/pulsecore/mutex-posix.c
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
29 #include <pulse/xmalloc.h>
30 #include <pulsecore/macro.h>
35 pthread_mutex_t mutex
;
42 pa_mutex
* pa_mutex_new(bool recursive
, bool inherit_priority
) {
44 pthread_mutexattr_t attr
;
45 #ifdef HAVE_PTHREAD_PRIO_INHERIT
49 pa_assert_se(pthread_mutexattr_init(&attr
) == 0);
52 pa_assert_se(pthread_mutexattr_settype(&attr
, PTHREAD_MUTEX_RECURSIVE
) == 0);
54 #ifdef HAVE_PTHREAD_PRIO_INHERIT
55 if (inherit_priority
) {
56 r
= pthread_mutexattr_setprotocol(&attr
, PTHREAD_PRIO_INHERIT
);
57 pa_assert(r
== 0 || r
== ENOTSUP
);
61 m
= pa_xnew(pa_mutex
, 1);
63 #ifndef HAVE_PTHREAD_PRIO_INHERIT
64 pa_assert_se(pthread_mutex_init(&m
->mutex
, &attr
) == 0);
67 if ((r
= pthread_mutex_init(&m
->mutex
, &attr
))) {
69 /* If this failed, then this was probably due to non-available
70 * priority inheritance. In which case we fall back to normal
72 pa_assert(r
== ENOTSUP
&& inherit_priority
);
74 pa_assert_se(pthread_mutexattr_setprotocol(&attr
, PTHREAD_PRIO_NONE
) == 0);
75 pa_assert_se(pthread_mutex_init(&m
->mutex
, &attr
) == 0);
82 void pa_mutex_free(pa_mutex
*m
) {
85 pa_assert_se(pthread_mutex_destroy(&m
->mutex
) == 0);
89 void pa_mutex_lock(pa_mutex
*m
) {
92 pa_assert_se(pthread_mutex_lock(&m
->mutex
) == 0);
95 bool pa_mutex_try_lock(pa_mutex
*m
) {
99 if ((r
= pthread_mutex_trylock(&m
->mutex
)) != 0) {
100 pa_assert(r
== EBUSY
);
107 void pa_mutex_unlock(pa_mutex
*m
) {
110 pa_assert_se(pthread_mutex_unlock(&m
->mutex
) == 0);
113 pa_cond
*pa_cond_new(void) {
116 c
= pa_xnew(pa_cond
, 1);
117 pa_assert_se(pthread_cond_init(&c
->cond
, NULL
) == 0);
121 void pa_cond_free(pa_cond
*c
) {
124 pa_assert_se(pthread_cond_destroy(&c
->cond
) == 0);
128 void pa_cond_signal(pa_cond
*c
, int broadcast
) {
132 pa_assert_se(pthread_cond_broadcast(&c
->cond
) == 0);
134 pa_assert_se(pthread_cond_signal(&c
->cond
) == 0);
137 int pa_cond_wait(pa_cond
*c
, pa_mutex
*m
) {
141 return pthread_cond_wait(&c
->cond
, &m
->mutex
);
144 pa_mutex
* pa_static_mutex_get(pa_static_mutex
*s
, bool recursive
, bool inherit_priority
) {
149 /* First, check if already initialized and short cut */
150 if ((m
= pa_atomic_ptr_load(&s
->ptr
)))
153 /* OK, not initialized, so let's allocate, and fill in */
154 m
= pa_mutex_new(recursive
, inherit_priority
);
155 if ((pa_atomic_ptr_cmpxchg(&s
->ptr
, NULL
, m
)))
160 /* Him, filling in failed, so someone else must have filled in
162 pa_assert_se(m
= pa_atomic_ptr_load(&s
->ptr
));