b325a92087
o Instead of checking both the passed in pointer and its value for NULL, only check the latter. Any caller that passes in a NULL pointer is obviously wrong.
114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/*
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* Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Daniel Eischen.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <pthread.h>
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#include "thr_private.h"
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__weak_reference(_pthread_mutexattr_getprioceiling, pthread_mutexattr_getprioceiling);
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__weak_reference(_pthread_mutexattr_setprioceiling, pthread_mutexattr_setprioceiling);
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__weak_reference(_pthread_mutex_getprioceiling, pthread_mutex_getprioceiling);
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__weak_reference(_pthread_mutex_setprioceiling, pthread_mutex_setprioceiling);
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int
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_pthread_mutexattr_getprioceiling(pthread_mutexattr_t *mattr, int *prioceiling)
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{
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int ret = 0;
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if (*mattr == NULL)
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ret = EINVAL;
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else
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*prioceiling = (*mattr)->m_ceiling;
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return(ret);
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}
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int
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_pthread_mutexattr_setprioceiling(pthread_mutexattr_t *mattr, int prioceiling)
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{
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int ret = 0;
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if (*mattr == NULL)
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ret = EINVAL;
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else if (prioceiling <= PTHREAD_MAX_PRIORITY &&
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prioceiling >= PTHREAD_MIN_PRIORITY)
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(*mattr)->m_ceiling = prioceiling;
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else
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ret = EINVAL;
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return (ret);
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}
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int
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_pthread_mutex_getprioceiling(pthread_mutex_t *mutex,
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int *prioceiling)
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{
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if (*mutex == NULL)
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return (EINVAL);
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else
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*prioceiling = (*mutex)->m_prio;
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return (0);
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}
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int
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_pthread_mutex_setprioceiling(pthread_mutex_t *mutex,
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int prioceiling, int *old_ceiling)
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{
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int ret = 0;
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if (*mutex == NULL)
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return (EINVAL);
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else if (prioceiling > PTHREAD_MAX_PRIORITY ||
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prioceiling < PTHREAD_MIN_PRIORITY)
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return (EINVAL);
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/*
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* Because of the use of pthread_mutex_unlock(), the
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* priority ceiling of a mutex cannot be changed
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* while the mutex is held by another thread. It also,
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* means that the the thread trying to change the
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* priority ceiling must adhere to prio protection rules.
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*/
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if ((ret = pthread_mutex_lock(mutex)) == 0) {
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/* Return the old ceiling and set the new ceiling: */
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*old_ceiling = (*mutex)->m_prio;
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(*mutex)->m_prio = prioceiling;
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/* Unlock the mutex: */
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ret = pthread_mutex_unlock(mutex);
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}
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return(ret);
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}
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