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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
/***
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 2.1 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
#ifndef OS_IS_WIN32
#include <pthread.h>
#endif
#include <signal.h>
#include <stdio.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#else
#include <pulsecore/poll.h>
#endif
#include <pulse/xmalloc.h>
#include <pulse/mainloop.h>
#include <pulse/i18n.h>
#include <pulsecore/log.h>
#include <pulsecore/hashmap.h>
#include <pulsecore/thread.h>
#include <pulsecore/mutex.h>
#include <pulsecore/macro.h>
#include "thread-mainloop.h"
struct pa_threaded_mainloop {
pa_mainloop *real_mainloop;
int n_waiting, n_waiting_for_accept;
pa_thread* thread;
pa_mutex* mutex;
pa_cond* cond, *accept_cond;
};
static inline int in_worker(pa_threaded_mainloop *m) {
return pa_thread_self() == m->thread;
}
static int poll_func(struct pollfd *ufds, unsigned long nfds, int timeout, void *userdata) {
pa_mutex *mutex = userdata;
int r;
pa_assert(mutex);
/* Before entering poll() we unlock the mutex, so that
* avahi_simple_poll_quit() can succeed from another thread. */
pa_mutex_unlock(mutex);
r = poll(ufds, nfds, timeout);
pa_mutex_lock(mutex);
return r;
}
static void thread(void *userdata) {
pa_threaded_mainloop *m = userdata;
#ifndef OS_IS_WIN32
sigset_t mask;
/* Make sure that signals are delivered to the main thread */
sigfillset(&mask);
pthread_sigmask(SIG_BLOCK, &mask, NULL);
#endif
pa_mutex_lock(m->mutex);
pa_mainloop_run(m->real_mainloop, NULL);
pa_mutex_unlock(m->mutex);
}
pa_threaded_mainloop *pa_threaded_mainloop_new(void) {
pa_threaded_mainloop *m;
pa_init_i18n();
m = pa_xnew(pa_threaded_mainloop, 1);
if (!(m->real_mainloop = pa_mainloop_new())) {
pa_xfree(m);
return NULL;
}
m->mutex = pa_mutex_new(TRUE, TRUE);
m->cond = pa_cond_new();
m->accept_cond = pa_cond_new();
m->thread = NULL;
pa_mainloop_set_poll_func(m->real_mainloop, poll_func, m->mutex);
m->n_waiting = 0;
return m;
}
void pa_threaded_mainloop_free(pa_threaded_mainloop* m) {
pa_assert(m);
/* Make sure that this function is not called from the helper thread */
pa_assert((m->thread && !pa_thread_is_running(m->thread)) || !in_worker(m));
pa_threaded_mainloop_stop(m);
if (m->thread)
pa_thread_free(m->thread);
pa_mainloop_free(m->real_mainloop);
pa_mutex_free(m->mutex);
pa_cond_free(m->cond);
pa_cond_free(m->accept_cond);
pa_xfree(m);
}
int pa_threaded_mainloop_start(pa_threaded_mainloop *m) {
pa_assert(m);
pa_assert(!m->thread || !pa_thread_is_running(m->thread));
if (!(m->thread = pa_thread_new(thread, m)))
return -1;
return 0;
}
void pa_threaded_mainloop_stop(pa_threaded_mainloop *m) {
pa_assert(m);
if (!m->thread || !pa_thread_is_running(m->thread))
return;
/* Make sure that this function is not called from the helper thread */
pa_assert(!in_worker(m));
pa_mutex_lock(m->mutex);
pa_mainloop_quit(m->real_mainloop, 0);
pa_mutex_unlock(m->mutex);
pa_thread_join(m->thread);
}
void pa_threaded_mainloop_lock(pa_threaded_mainloop *m) {
pa_assert(m);
/* Make sure that this function is not called from the helper thread */
pa_assert(!m->thread || !pa_thread_is_running(m->thread) || !in_worker(m));
pa_mutex_lock(m->mutex);
}
void pa_threaded_mainloop_unlock(pa_threaded_mainloop *m) {
pa_assert(m);
/* Make sure that this function is not called from the helper thread */
pa_assert(!m->thread || !pa_thread_is_running(m->thread) || !in_worker(m));
pa_mutex_unlock(m->mutex);
}
void pa_threaded_mainloop_signal(pa_threaded_mainloop *m, int wait_for_accept) {
pa_assert(m);
pa_cond_signal(m->cond, 1);
if (wait_for_accept) {
m->n_waiting_for_accept ++;
while (m->n_waiting_for_accept > 0)
pa_cond_wait(m->accept_cond, m->mutex);
}
}
void pa_threaded_mainloop_wait(pa_threaded_mainloop *m) {
pa_assert(m);
/* Make sure that this function is not called from the helper thread */
pa_assert(!m->thread || !pa_thread_is_running(m->thread) || !in_worker(m));
m->n_waiting ++;
pa_cond_wait(m->cond, m->mutex);
pa_assert(m->n_waiting > 0);
m->n_waiting --;
}
void pa_threaded_mainloop_accept(pa_threaded_mainloop *m) {
pa_assert(m);
/* Make sure that this function is not called from the helper thread */
pa_assert(!m->thread || !pa_thread_is_running(m->thread) || !in_worker(m));
pa_assert(m->n_waiting_for_accept > 0);
m->n_waiting_for_accept --;
pa_cond_signal(m->accept_cond, 0);
}
int pa_threaded_mainloop_get_retval(pa_threaded_mainloop *m) {
pa_assert(m);
return pa_mainloop_get_retval(m->real_mainloop);
}
pa_mainloop_api* pa_threaded_mainloop_get_api(pa_threaded_mainloop*m) {
pa_assert(m);
return pa_mainloop_get_api(m->real_mainloop);
}
int pa_threaded_mainloop_in_thread(pa_threaded_mainloop *m) {
pa_assert(m);
return m->thread && pa_thread_self() == m->thread;
}
|
