mariadb/mysys/my_os2mutex.c

/*
 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
 * All rights reserved.
 *
 * Modified and extended by Antony T Curtis <antony.curtis@olcs.net>
 * for use with OS/2.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by John Birrell.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <stdlib.h>
#include <errno.h>
#ifdef _THREAD_SAFE

int
pthread_mutex_init(pthread_mutex_t * mutex,
		   const pthread_mutexattr_t * mutex_attr)
{
  (void) DosCreateMutexSem(NULL,mutex,0,0);
  return (0);				/* Return the completion status: */
}


int
pthread_mutex_destroy(pthread_mutex_t * mutex)
{
  APIRET rc;

  do
  {
    rc = DosCloseMutexSem(*mutex);
    if (rc == 301) DosReleaseMutexSem(*mutex);
  } while (rc == 301);

  *mutex = 0;
  return (0);				/* Return the completion status: */
}


int
pthread_mutex_lock(pthread_mutex_t * mutex)
{
  APIRET rc;

  rc = DosRequestMutexSem(*mutex,SEM_INDEFINITE_WAIT);
  if (rc)
    return(EINVAL);
  return (0);				/* Return the completion status: */
}


int
pthread_mutex_unlock(pthread_mutex_t * mutex)
{
  (void) DosReleaseMutexSem(*mutex);
  return (0);				/* Return the completion status: */
}
#endif