kc3-lang/libevent/evthread_pthread.c

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• Hash : ec35eb55
  Author :
  Date : 2009-02-12T22:19:54
  

  Make threading functions global, like the mm_ functions.  Use the libevent_pthread.la library in regress_pthread.
  
  svn:r1121
  

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• evthread_pthread.c

• /*
   * Copyright 2009 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.
   */
  #ifdef HAVE_CONFIG_H
  #include "event-config.h"
  #endif
  
  /* With glibc we need to define this to get PTHREAD_MUTEX_RECURSIVE. */
  #define _GNU_SOURCE
  #include <pthread.h>
  
  struct event_base;
  #include <event2/thread.h>
  
  #include "mm-internal.h"
  
  static pthread_mutexattr_t attr_recursive;
  
  static void *
  evthread_posix_lock_create(void)
  {
  	pthread_mutex_t *lock = mm_malloc(sizeof(pthread_mutex_t));
  	if (!lock)
  		return NULL;
  	if (pthread_mutex_init(lock, &attr_recursive)) {
  		mm_free(lock);
  		return NULL;
  	}
  	return lock;
  }
  
  static void
  evthread_posix_lock_free(void *_lock)
  {
  	pthread_mutex_t *lock = _lock;
  	pthread_mutex_destroy(lock);
  	mm_free(lock);
  }
  
  static void
  evthread_posix_lock(int mode, void *_lock)
  {
  	pthread_mutex_t *lock = _lock;
  	if (0 != (mode & EVTHREAD_LOCK))
  		pthread_mutex_lock(lock);
  	else
  		pthread_mutex_unlock(lock);
  }
  
  static unsigned long
  evthread_posix_get_id(void)
  {
  	union {
  		pthread_t thr;
  		unsigned long id;
  	} r;
  	r.thr = pthread_self();
  	return r.id;
  }
  
  int
  evthread_use_pthreads(void)
  {
  	/* Set ourselves up to get recursive locks. */
  	pthread_mutexattr_init(&attr_recursive);
  	pthread_mutexattr_settype(&attr_recursive, PTHREAD_MUTEX_RECURSIVE);
  
  	evthread_set_lock_create_callbacks(
  	    evthread_posix_lock_create,
  	    evthread_posix_lock_free);
  	evthread_set_locking_callback(evthread_posix_lock);
  	evthread_set_id_callback(evthread_posix_get_id);
  	return -1;
  }
  

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