summaryrefslogtreecommitdiffstats
path: root/src/pulsecore/thread-posix.c
blob: 15ade29098b0a09f1731382fb79e8d8096e8d5c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/* $Id$ */

/***
  This file is part of PulseAudio.
 
  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 <pthread.h>
#include <atomic_ops.h>

#include <pulse/xmalloc.h>

#include "thread.h"

#define ASSERT_SUCCESS(x) do { \
    int _r = (x); \
    assert(_r == 0); \
} while(0)

struct pa_thread {
    pthread_t id;
    pa_thread_func_t thread_func;
    void *userdata;
    AO_t running;
};

struct pa_tls {
    pthread_key_t key;
};

static pa_tls *thread_tls;
static pthread_once_t thread_tls_once = PTHREAD_ONCE_INIT;

static void thread_tls_once_func(void) {
    thread_tls = pa_tls_new(NULL);
    assert(thread_tls);
}

static void* internal_thread_func(void *userdata) {
    pa_thread *t = userdata;
    assert(t);

    t->id = pthread_self();

    ASSERT_SUCCESS(pthread_once(&thread_tls_once, thread_tls_once_func));
    pa_tls_set(thread_tls, t);
    
    AO_store_release_write(&t->running, 1);
    t->thread_func(t->userdata);
    AO_store_release_write(&t->running, 0);
    
    return NULL;
}

pa_thread* pa_thread_new(pa_thread_func_t thread_func, void *userdata) {
    pa_thread *t;

    t = pa_xnew(pa_thread, 1);
    t->thread_func = thread_func;
    t->userdata = userdata;

    if (pthread_create(&t->id, NULL, internal_thread_func, t) < 0) {
        pa_xfree(t);
        return NULL;
    }

    return t;
}

int pa_thread_is_running(pa_thread *t) {
    assert(t);

    return !!AO_load_acquire_read(&t->running);
}

void pa_thread_free(pa_thread *t) {
    assert(t);
    
    pa_thread_join(t);
    pa_xfree(t);
}

int pa_thread_join(pa_thread *t) {
    assert(t);
    
    return pthread_join(t->id, NULL);
}

pa_thread* pa_thread_self(void) {
    ASSERT_SUCCESS(pthread_once(&thread_tls_once, thread_tls_once_func));
    return pa_tls_get(thread_tls);
}

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) {
    assert(t);

    ASSERT_SUCCESS(pthread_key_delete(t->key));
    pa_xfree(t);
}

void *pa_tls_get(pa_tls *t) {
    assert(t);
    
    return pthread_getspecific(t->key);
}

void *pa_tls_set(pa_tls *t, void *userdata) {
    void *r;
    
    r = pthread_getspecific(t->key);
    ASSERT_SUCCESS(pthread_setspecific(t->key, userdata));
    return r;
}