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
|
/***
This file is part of avahi.
avahi 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.
avahi 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 Lesser General
Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with avahi; 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 <poll.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <pthread.h>
#include <signal.h>
#include "llist.h"
#include "malloc.h"
#include "timeval.h"
#include "simple-watch.h"
#include "thread-watch.h"
struct AvahiThreadedPoll {
AvahiSimplePoll *simple_poll;
pthread_t thread_id;
pthread_mutex_t mutex;
int thread_running;
int retval;
};
static int poll_func(struct pollfd *ufds, unsigned int nfds, int timeout, void *userdata) {
pthread_mutex_t *mutex = userdata;
int r;
/* Before entering poll() we unlock the mutex, so that
* avahi_simple_poll_quit() can succeed from another thread. */
pthread_mutex_unlock(mutex);
r = poll(ufds, nfds, timeout);
pthread_mutex_lock(mutex);
return r;
}
static void* thread(void *userdata){
AvahiThreadedPoll *p = userdata;
sigset_t mask;
/* Make sure that signals are delivered to the main thread */
sigfillset(&mask);
pthread_sigmask(SIG_BLOCK, &mask, NULL);
pthread_mutex_lock(&p->mutex);
p->retval = avahi_simple_poll_loop(p->simple_poll);
pthread_mutex_unlock(&p->mutex);
return NULL;
}
AvahiThreadedPoll *avahi_threaded_poll_new(void) {
AvahiThreadedPoll *p;
if (!(p = avahi_new(AvahiThreadedPoll, 1)))
goto fail; /* OOM */
if (!(p->simple_poll = avahi_simple_poll_new()))
goto fail;
pthread_mutex_init(&p->mutex, NULL);
avahi_simple_poll_set_func(p->simple_poll, poll_func, &p->mutex);
p->thread_running = 0;
return p;
fail:
if (p) {
if (p->simple_poll) {
avahi_simple_poll_free(p->simple_poll);
pthread_mutex_destroy(&p->mutex);
}
avahi_free(p);
}
return NULL;
}
void avahi_threaded_poll_free(AvahiThreadedPoll *p) {
assert(p);
/* Make sure that this function is not called from the helper thread */
assert(!p->thread_running || !pthread_equal(pthread_self(), p->thread_id));
if (p->thread_running)
avahi_threaded_poll_stop(p);
if (p->simple_poll)
avahi_simple_poll_free(p->simple_poll);
pthread_mutex_destroy(&p->mutex);
avahi_free(p);
}
const AvahiPoll* avahi_threaded_poll_get(AvahiThreadedPoll *p) {
assert(p);
return avahi_simple_poll_get(p->simple_poll);
}
int avahi_threaded_poll_start(AvahiThreadedPoll *p) {
assert(p);
assert(!p->thread_running);
if (pthread_create(&p->thread_id, NULL, thread, p) < 0)
return -1;
p->thread_running = 1;
return 0;
}
int avahi_threaded_poll_stop(AvahiThreadedPoll *p) {
assert(p);
if (!p->thread_running)
return -1;
/* Make sure that this function is not called from the helper thread */
assert(!pthread_equal(pthread_self(), p->thread_id));
pthread_mutex_lock(&p->mutex);
avahi_simple_poll_quit(p->simple_poll);
pthread_mutex_unlock(&p->mutex);
pthread_join(p->thread_id, NULL);
p->thread_running = 0;
return p->retval;
}
void avahi_threaded_poll_quit(AvahiThreadedPoll *p) {
assert(p);
/* Make sure that this function is called from the helper thread */
assert(pthread_equal(pthread_self(), p->thread_id));
avahi_simple_poll_quit(p->simple_poll);
}
void avahi_threaded_poll_lock(AvahiThreadedPoll *p) {
assert(p);
/* Make sure that this function is not called from the helper thread */
assert(!p->thread_running || !pthread_equal(pthread_self(), p->thread_id));
pthread_mutex_lock(&p->mutex);
}
void avahi_threaded_poll_unlock(AvahiThreadedPoll *p) {
assert(p);
/* Make sure that this function is not called from the helper thread */
assert(!p->thread_running || !pthread_equal(pthread_self(), p->thread_id));
pthread_mutex_unlock(&p->mutex);
}
|
