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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/* $Id$ */
/***
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 <sched.h>
#include <atomic_ops.h>
#include <pulse/xmalloc.h>
#include <pulsecore/mutex.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 pa_mutex *once_mutex;
static pthread_once_t thread_once_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_fetch_and_add1_full(&t->running);
t->thread_func(t->userdata);
AO_fetch_and_add_full(&t->running, (AO_t) -2);
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;
AO_store_full(&t->running, 0);
if (pthread_create(&t->id, NULL, internal_thread_func, t) < 0) {
pa_xfree(t);
return NULL;
}
AO_fetch_and_add1_full(&t->running);
return t;
}
int pa_thread_is_running(pa_thread *t) {
AO_t r;
assert(t);
r = AO_load_full(&t->running);
return r == 1 || r == 2;
}
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) {
pa_thread *t;
ASSERT_SUCCESS(pthread_once(&thread_tls_once, thread_tls_once_func));
if ((t = pa_tls_get(thread_tls)))
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;
AO_store_full(&t->running, 1);
pa_tls_set(thread_tls, t);
return t;
}
void pa_thread_yield(void) {
#ifdef HAVE_PTHREAD_YIELD
pthread_yield();
#else
ASSERT_SUCCESS(sched_yield());
#endif
}
static void thread_once_once_func(void) {
once_mutex = pa_mutex_new(0);
assert(once_mutex);
}
void pa_thread_once(pa_thread_once_t *control, pa_thread_once_func_t once_func) {
assert(control);
assert(once_func);
ASSERT_SUCCESS(pthread_once(&thread_once_once, thread_once_once_func));
pa_mutex_lock(once_mutex);
if (*control == PA_THREAD_ONCE_INIT) {
*control = ~PA_THREAD_ONCE_INIT;
pa_mutex_unlock(once_mutex);
once_func();
} else
pa_mutex_unlock(once_mutex);
}
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;
}
|
