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/* $OpenBSD: uthread_mutex_prioceiling.c,v 1.2 1999/11/25 07:01:40 d Exp $ */
/*
* Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
* All rights reserved.
*
* 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 Daniel Eischen.
* 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 DANIEL EISCHEN 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 AUTHOR 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.
*
* $FreeBSD: uthread_mutex_prioceiling.c,v 1.3 1999/08/28 00:03:40 peter Exp $
*/
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
int
pthread_mutexattr_getprioceiling(pthread_mutexattr_t *mattr, int *prioceiling)
{
int ret = 0;
if ((mattr == NULL) || (*mattr == NULL))
ret = EINVAL;
else if ((*mattr)->m_protocol != PTHREAD_PRIO_PROTECT)
ret = EINVAL;
else
*prioceiling = (*mattr)->m_ceiling;
return(ret);
}
int
pthread_mutexattr_setprioceiling(pthread_mutexattr_t *mattr, int prioceiling)
{
int ret = 0;
if ((mattr == NULL) || (*mattr == NULL))
ret = EINVAL;
else if ((*mattr)->m_protocol != PTHREAD_PRIO_PROTECT)
ret = EINVAL;
else
(*mattr)->m_ceiling = prioceiling;
return(ret);
}
int
pthread_mutex_getprioceiling(pthread_mutex_t *mutex,
int *prioceiling)
{
int ret;
if ((mutex == NULL) || (*mutex == NULL))
ret = EINVAL;
else if ((*mutex)->m_protocol != PTHREAD_PRIO_PROTECT)
ret = EINVAL;
else
ret = (*mutex)->m_prio;
return(ret);
}
int
pthread_mutex_setprioceiling(pthread_mutex_t *mutex,
int prioceiling, int *old_ceiling)
{
int ret = 0;
if ((mutex == NULL) || (*mutex == NULL))
ret = EINVAL;
else if ((*mutex)->m_protocol != PTHREAD_PRIO_PROTECT)
ret = EINVAL;
else {
/* Lock the mutex: */
if ((ret = pthread_mutex_lock(mutex)) == 0) {
/* Return the old ceiling and set the new ceiling: */
*old_ceiling = (*mutex)->m_prio;
(*mutex)->m_prio = prioceiling;
/* Unlock the mutex: */
ret = pthread_mutex_unlock(mutex);
}
}
return(ret);
}
#endif
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