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/* $Id$ */
/***
This file is part of PulseAudio.
Copyright 2006 Lennart Poettering
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 <pthread.h>
#include <sched.h>
#include <errno.h>
#include <pulse/xmalloc.h>
#include <pulsecore/mutex.h>
#include <pulsecore/once.h>
#include <pulsecore/atomic.h>
#include <pulsecore/macro.h>
#include "thread.h"
struct pa_thread {
pthread_t id;
pa_thread_func_t thread_func;
void *userdata;
pa_atomic_t running;
};
struct pa_tls {
pthread_key_t key;
};
static void thread_free_cb(void *p) {
pa_thread *t = p;
pa_assert(t);
if (!t->thread_func)
/* This is a foreign thread, we need to free the struct */
pa_xfree(t);
}
PA_STATIC_TLS_DECLARE(current_thread, thread_free_cb);
static void* internal_thread_func(void *userdata) {
pa_thread *t = userdata;
pa_assert(t);
t->id = pthread_self();
PA_STATIC_TLS_SET(current_thread, t);
pa_atomic_inc(&t->running);
t->thread_func(t->userdata);
pa_atomic_sub(&t->running, 2);
return NULL;
}
pa_thread* pa_thread_new(pa_thread_func_t thread_func, void *userdata) {
pa_thread *t;
pa_assert(thread_func);
t = pa_xnew(pa_thread, 1);
t->thread_func = thread_func;
t->userdata = userdata;
pa_atomic_store(&t->running, 0);
if (pthread_create(&t->id, NULL, internal_thread_func, t) < 0) {
pa_xfree(t);
return NULL;
}
pa_atomic_inc(&t->running);
return t;
}
int pa_thread_is_running(pa_thread *t) {
pa_assert(t);
/* Unfortunately there is no way to tell whether a "foreign"
* thread is still running. See
* http://udrepper.livejournal.com/16844.html for more
* information */
pa_assert(t->thread_func);
return pa_atomic_load(&t->running) > 0;
}
void pa_thread_free(pa_thread *t) {
pa_assert(t);
pa_thread_join(t);
pa_xfree(t);
}
int pa_thread_join(pa_thread *t) {
pa_assert(t);
return pthread_join(t->id, NULL);
}
pa_thread* pa_thread_self(void) {
pa_thread *t;
if ((t = PA_STATIC_TLS_GET(current_thread)))
return t;
/* This is a foreign thread, let's create a pthread structure to
* make sure that we can always return a sensible pointer */
t = pa_xnew(pa_thread, 1);
t->id = pthread_self();
t->thread_func = NULL;
t->userdata = NULL;
pa_atomic_store(&t->running, 2);
PA_STATIC_TLS_SET(current_thread, t);
return t;
}
void* pa_thread_get_data(pa_thread *t) {
pa_assert(t);
return t->userdata;
}
void pa_thread_set_data(pa_thread *t, void *userdata) {
pa_assert(t);
t->userdata = userdata;
}
void pa_thread_yield(void) {
#ifdef HAVE_PTHREAD_YIELD
pthread_yield();
#else
pa_assert_se(sched_yield() == 0);
#endif
}
pa_tls* pa_tls_new(pa_free_cb_t free_cb) {
pa_tls *t;
t = pa_xnew(pa_tls, 1);
if (pthread_key_create(&t->key, free_cb) < 0) {
pa_xfree(t);
return NULL;
}
return t;
}
void pa_tls_free(pa_tls *t) {
pa_assert(t);
pa_assert_se(pthread_key_delete(t->key) == 0);
pa_xfree(t);
}
void *pa_tls_get(pa_tls *t) {
pa_assert(t);
return pthread_getspecific(t->key);
}
void *pa_tls_set(pa_tls *t, void *userdata) {
void *r;
r = pthread_getspecific(t->key);
pa_assert_se(pthread_setspecific(t->key, userdata) == 0);
return r;
}
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