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 */ 26 #ifdef HAVE_CONFIG_H 27 #include "event-config.h" 28 #endif 29 30 #include <pthread.h> 31 struct event_base; 32 #include <event2/thread.h> 33 34 #include "mm-internal.h" 35 36 static void * 37 evthread_posix_lock_create(void) 38 { 39 pthread_mutex_t *lock = mm_malloc(sizeof(pthread_mutex_t)); 40 if (!lock) 41 return NULL; 42 pthread_mutex_init(lock, NULL); 43 return lock; 44 } 45 46 static void 47 evthread_posix_lock_free(void *_lock) 48 { 49 pthread_mutex_t *lock = _lock; 50 pthread_mutex_destroy(lock); 51 mm_free(lock); 52 } 53 54 static void 55 evthread_posix_lock(int mode, void *_lock) 56 { 57 pthread_mutex_t *lock = _lock; 58 if (0 != (mode & EVTHREAD_LOCK)) 59 pthread_mutex_lock(lock); 60 else 61 pthread_mutex_unlock(lock); 62 } 63 64 static unsigned long 65 evthread_posix_get_id(void) 66 { 67 union { 68 pthread_t thr; 69 unsigned long id; 70 } r; 71 r.thr = pthread_self(); 72 return r.id; 73 } 74 75 int 76 evthread_use_pthreads(struct event_base *base) 77 { 78 evthread_set_lock_create_callbacks(base, 79 evthread_posix_lock_create, 80 evthread_posix_lock_free); 81 evthread_set_locking_callback(base, evthread_posix_lock); 82 evthread_set_id_callback(base, evthread_posix_get_id); 83 return -1; 84 } 85