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b85b710 Update copyright statements to reflect the facts that:
Nick Mathewson authored
1 /*
2 * Copyright 2009 Niels Provos and Nick Mathewson
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
8889a77 Replace all use of config.h with event-config.h.
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26 #include "event-config.h"
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27
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28 /* With glibc we need to define this to get PTHREAD_MUTEX_RECURSIVE. */
29 #define _GNU_SOURCE
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30 #include <pthread.h>
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31
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32 struct event_base;
33 #include <event2/thread.h>
34
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35 #include <stdlib.h>
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36 #include "mm-internal.h"
37
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38 static pthread_mutexattr_t attr_recursive;
39
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40 static void *
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41 evthread_posix_lock_alloc(unsigned locktype)
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42 {
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43 pthread_mutexattr_t *attr = NULL;
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44 pthread_mutex_t *lock = mm_malloc(sizeof(pthread_mutex_t));
45 if (!lock)
46 return NULL;
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47 if (locktype & EVTHREAD_LOCKTYPE_RECURSIVE)
48 attr = &attr_recursive;
49 if (pthread_mutex_init(lock, attr)) {
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50 mm_free(lock);
51 return NULL;
52 }
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53 return lock;
54 }
55
56 static void
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57 evthread_posix_lock_free(void *_lock, unsigned locktype)
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58 {
59 pthread_mutex_t *lock = _lock;
60 pthread_mutex_destroy(lock);
61 mm_free(lock);
62 }
63
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64 static int
65 evthread_posix_lock(unsigned mode, void *_lock)
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66 {
67 pthread_mutex_t *lock = _lock;
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68 if (mode & EVTHREAD_TRY)
69 return pthread_mutex_trylock(lock);
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70 else
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71 return pthread_mutex_lock(lock);
72 }
73
74 static int
75 evthread_posix_unlock(unsigned mode, void *_lock)
76 {
77 pthread_mutex_t *lock = _lock;
78 return pthread_mutex_unlock(lock);
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79 }
80
81 static unsigned long
82 evthread_posix_get_id(void)
83 {
84 union {
85 pthread_t thr;
86 unsigned long id;
87 } r;
88 r.thr = pthread_self();
89 return r.id;
90 }
91
92 int
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93 evthread_use_pthreads(void)
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94 {
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95 struct evthread_lock_callbacks cbs = {
96 EVTHREAD_LOCK_API_VERSION,
97 EVTHREAD_LOCKTYPE_RECURSIVE,
98 evthread_posix_lock_alloc,
99 evthread_posix_lock_free,
100 evthread_posix_lock,
101 evthread_posix_unlock
102 };
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103 /* Set ourselves up to get recursive locks. */
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104 if (pthread_mutexattr_init(&attr_recursive))
105 return -1;
106 if (pthread_mutexattr_settype(&attr_recursive, PTHREAD_MUTEX_RECURSIVE))
107 return -1;
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108
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109 evthread_set_lock_callbacks(&cbs);
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110 evthread_set_id_callback(evthread_posix_get_id);
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111 return 0;
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112 }
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