1 /* $NetBSD: evthread_pthread.c,v 1.1.1.1 2013/04/11 16:43:25 christos Exp $ */
2 /*
3 * Copyright 2009-2012 Niels Provos and Nick Mathewson
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27 #include "event2/event-config.h"
28 #include <sys/cdefs.h>
29 __RCSID("$NetBSD: evthread_pthread.c,v 1.1.1.1 2013/04/11 16:43:25 christos Exp $");
30
31 /* With glibc we need to define this to get PTHREAD_MUTEX_RECURSIVE. */
32 #define _GNU_SOURCE
33 #include <pthread.h>
34
35 struct event_base;
36 #include "event2/thread.h"
37
38 #include <stdlib.h>
39 #include <string.h>
40 #include "mm-internal.h"
41 #include "evthread-internal.h"
42
43 static pthread_mutexattr_t attr_recursive;
44
45 static void *
evthread_posix_lock_alloc(unsigned locktype)46 evthread_posix_lock_alloc(unsigned locktype)
47 {
48 pthread_mutexattr_t *attr = NULL;
49 pthread_mutex_t *lock = mm_malloc(sizeof(pthread_mutex_t));
50 if (!lock)
51 return NULL;
52 if (locktype & EVTHREAD_LOCKTYPE_RECURSIVE)
53 attr = &attr_recursive;
54 if (pthread_mutex_init(lock, attr)) {
55 mm_free(lock);
56 return NULL;
57 }
58 return lock;
59 }
60
61 static void
evthread_posix_lock_free(void * _lock,unsigned locktype)62 evthread_posix_lock_free(void *_lock, unsigned locktype)
63 {
64 pthread_mutex_t *lock = _lock;
65 pthread_mutex_destroy(lock);
66 mm_free(lock);
67 }
68
69 static int
evthread_posix_lock(unsigned mode,void * _lock)70 evthread_posix_lock(unsigned mode, void *_lock)
71 {
72 pthread_mutex_t *lock = _lock;
73 if (mode & EVTHREAD_TRY)
74 return pthread_mutex_trylock(lock);
75 else
76 return pthread_mutex_lock(lock);
77 }
78
79 static int
evthread_posix_unlock(unsigned mode,void * _lock)80 evthread_posix_unlock(unsigned mode, void *_lock)
81 {
82 pthread_mutex_t *lock = _lock;
83 return pthread_mutex_unlock(lock);
84 }
85
86 static unsigned long
evthread_posix_get_id(void)87 evthread_posix_get_id(void)
88 {
89 union {
90 pthread_t thr;
91 #if _EVENT_SIZEOF_PTHREAD_T > _EVENT_SIZEOF_LONG
92 ev_uint64_t id;
93 #else
94 unsigned long id;
95 #endif
96 } r;
97 #if _EVENT_SIZEOF_PTHREAD_T < _EVENT_SIZEOF_LONG
98 memset(&r, 0, sizeof(r));
99 #endif
100 r.thr = pthread_self();
101 return (unsigned long)r.id;
102 }
103
104 static void *
evthread_posix_cond_alloc(unsigned condflags)105 evthread_posix_cond_alloc(unsigned condflags)
106 {
107 pthread_cond_t *cond = mm_malloc(sizeof(pthread_cond_t));
108 if (!cond)
109 return NULL;
110 if (pthread_cond_init(cond, NULL)) {
111 mm_free(cond);
112 return NULL;
113 }
114 return cond;
115 }
116
117 static void
evthread_posix_cond_free(void * _cond)118 evthread_posix_cond_free(void *_cond)
119 {
120 pthread_cond_t *cond = _cond;
121 pthread_cond_destroy(cond);
122 mm_free(cond);
123 }
124
125 static int
evthread_posix_cond_signal(void * _cond,int broadcast)126 evthread_posix_cond_signal(void *_cond, int broadcast)
127 {
128 pthread_cond_t *cond = _cond;
129 int r;
130 if (broadcast)
131 r = pthread_cond_broadcast(cond);
132 else
133 r = pthread_cond_signal(cond);
134 return r ? -1 : 0;
135 }
136
137 static int
evthread_posix_cond_wait(void * _cond,void * _lock,const struct timeval * tv)138 evthread_posix_cond_wait(void *_cond, void *_lock, const struct timeval *tv)
139 {
140 int r;
141 pthread_cond_t *cond = _cond;
142 pthread_mutex_t *lock = _lock;
143
144 if (tv) {
145 struct timeval now, abstime;
146 struct timespec ts;
147 evutil_gettimeofday(&now, NULL);
148 evutil_timeradd(&now, tv, &abstime);
149 ts.tv_sec = abstime.tv_sec;
150 ts.tv_nsec = abstime.tv_usec*1000;
151 r = pthread_cond_timedwait(cond, lock, &ts);
152 if (r == ETIMEDOUT)
153 return 1;
154 else if (r)
155 return -1;
156 else
157 return 0;
158 } else {
159 r = pthread_cond_wait(cond, lock);
160 return r ? -1 : 0;
161 }
162 }
163
164 int
evthread_use_pthreads(void)165 evthread_use_pthreads(void)
166 {
167 struct evthread_lock_callbacks cbs = {
168 EVTHREAD_LOCK_API_VERSION,
169 EVTHREAD_LOCKTYPE_RECURSIVE,
170 evthread_posix_lock_alloc,
171 evthread_posix_lock_free,
172 evthread_posix_lock,
173 evthread_posix_unlock
174 };
175 struct evthread_condition_callbacks cond_cbs = {
176 EVTHREAD_CONDITION_API_VERSION,
177 evthread_posix_cond_alloc,
178 evthread_posix_cond_free,
179 evthread_posix_cond_signal,
180 evthread_posix_cond_wait
181 };
182 /* Set ourselves up to get recursive locks. */
183 if (pthread_mutexattr_init(&attr_recursive))
184 return -1;
185 if (pthread_mutexattr_settype(&attr_recursive, PTHREAD_MUTEX_RECURSIVE))
186 return -1;
187
188 evthread_set_lock_callbacks(&cbs);
189 evthread_set_condition_callbacks(&cond_cbs);
190 evthread_set_id_callback(evthread_posix_get_id);
191 return 0;
192 }
193