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ipc/chromium/src/third_party/libevent/evthread_pthread.c@6474c204b198 (annotated)

ipc/chromium/src/third_party/libevent/evthread_pthread.c

Wed, 31 Dec 2014 06:09:35 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 06:09:35 +0100
changeset 0
6474c204b198
permissions
-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

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

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