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Diffstat (limited to 'libs/libevent/docs/evthread_pthread.c')
| -rw-r--r-- | libs/libevent/docs/evthread_pthread.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/libs/libevent/docs/evthread_pthread.c b/libs/libevent/docs/evthread_pthread.c new file mode 100644 index 0000000000..4e11f74970 --- /dev/null +++ b/libs/libevent/docs/evthread_pthread.c @@ -0,0 +1,191 @@ +/* + * Copyright 2009-2012 Niels Provos and Nick Mathewson + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#include "event2/event-config.h" +#include "evconfig-private.h" + +/* With glibc we need to define _GNU_SOURCE to get PTHREAD_MUTEX_RECURSIVE. + * This comes from evconfig-private.h + */ +#include <pthread.h> + +struct event_base; +#include "event2/thread.h" + +#include <stdlib.h> +#include <string.h> +#include "mm-internal.h" +#include "evthread-internal.h" + +static pthread_mutexattr_t attr_recursive; + +static void * +evthread_posix_lock_alloc(unsigned locktype) +{ + pthread_mutexattr_t *attr = NULL; + pthread_mutex_t *lock = mm_malloc(sizeof(pthread_mutex_t)); + if (!lock) + return NULL; + if (locktype & EVTHREAD_LOCKTYPE_RECURSIVE) + attr = &attr_recursive; + if (pthread_mutex_init(lock, attr)) { + mm_free(lock); + return NULL; + } + return lock; +} + +static void +evthread_posix_lock_free(void *lock_, unsigned locktype) +{ + pthread_mutex_t *lock = lock_; + pthread_mutex_destroy(lock); + mm_free(lock); +} + +static int +evthread_posix_lock(unsigned mode, void *lock_) +{ + pthread_mutex_t *lock = lock_; + if (mode & EVTHREAD_TRY) + return pthread_mutex_trylock(lock); + else + return pthread_mutex_lock(lock); +} + +static int +evthread_posix_unlock(unsigned mode, void *lock_) +{ + pthread_mutex_t *lock = lock_; + return pthread_mutex_unlock(lock); +} + +static unsigned long +evthread_posix_get_id(void) +{ + union { + pthread_t thr; +#if EVENT__SIZEOF_PTHREAD_T > EVENT__SIZEOF_LONG + ev_uint64_t id; +#else + unsigned long id; +#endif + } r; +#if EVENT__SIZEOF_PTHREAD_T < EVENT__SIZEOF_LONG + memset(&r, 0, sizeof(r)); +#endif + r.thr = pthread_self(); + return (unsigned long)r.id; +} + +static void * +evthread_posix_cond_alloc(unsigned condflags) +{ + pthread_cond_t *cond = mm_malloc(sizeof(pthread_cond_t)); + if (!cond) + return NULL; + if (pthread_cond_init(cond, NULL)) { + mm_free(cond); + return NULL; + } + return cond; +} + +static void +evthread_posix_cond_free(void *cond_) +{ + pthread_cond_t *cond = cond_; + pthread_cond_destroy(cond); + mm_free(cond); +} + +static int +evthread_posix_cond_signal(void *cond_, int broadcast) +{ + pthread_cond_t *cond = cond_; + int r; + if (broadcast) + r = pthread_cond_broadcast(cond); + else + r = pthread_cond_signal(cond); + return r ? -1 : 0; +} + +static int +evthread_posix_cond_wait(void *cond_, void *lock_, const struct timeval *tv) +{ + int r; + pthread_cond_t *cond = cond_; + pthread_mutex_t *lock = lock_; + + if (tv) { + struct timeval now, abstime; + struct timespec ts; + evutil_gettimeofday(&now, NULL); + evutil_timeradd(&now, tv, &abstime); + ts.tv_sec = abstime.tv_sec; + ts.tv_nsec = abstime.tv_usec*1000; + r = pthread_cond_timedwait(cond, lock, &ts); + if (r == ETIMEDOUT) + return 1; + else if (r) + return -1; + else + return 0; + } else { + r = pthread_cond_wait(cond, lock); + return r ? -1 : 0; + } +} + +int +evthread_use_pthreads(void) +{ + struct evthread_lock_callbacks cbs = { + EVTHREAD_LOCK_API_VERSION, + EVTHREAD_LOCKTYPE_RECURSIVE, + evthread_posix_lock_alloc, + evthread_posix_lock_free, + evthread_posix_lock, + evthread_posix_unlock + }; + struct evthread_condition_callbacks cond_cbs = { + EVTHREAD_CONDITION_API_VERSION, + evthread_posix_cond_alloc, + evthread_posix_cond_free, + evthread_posix_cond_signal, + evthread_posix_cond_wait + }; + /* Set ourselves up to get recursive locks. */ + if (pthread_mutexattr_init(&attr_recursive)) + return -1; + if (pthread_mutexattr_settype(&attr_recursive, PTHREAD_MUTEX_RECURSIVE)) + return -1; + + evthread_set_lock_callbacks(&cbs); + evthread_set_condition_callbacks(&cond_cbs); + evthread_set_id_callback(evthread_posix_get_id); + return 0; +} |