lib/libthread_xu/thread/thr_mutex_prioceiling.c

   1 /*
   2  * Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Daniel Eischen.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $DragonFly: src/lib/libthread_xu/thread/thr_mutex_prioceiling.c,v 1.3 2006/04/06 13:03:09 davidxu Exp $
  33  */
  34
  35 #include "namespace.h"
  36 #include <errno.h>
  37 #include <pthread.h>
  38 #include "un-namespace.h"
  39
  40 #include "thr_private.h"
  41
  42 int
  43 _pthread_mutexattr_getprioceiling(pthread_mutexattr_t *mattr, int *prioceiling)
  44 {
  45         int ret = 0;
  46
  47         if ((mattr == NULL) || (*mattr == NULL))
  48                 ret = EINVAL;
  49         else if ((*mattr)->m_protocol != PTHREAD_PRIO_PROTECT)
  50                 ret = EINVAL;
  51         else
  52                 *prioceiling = (*mattr)->m_ceiling;
  53
  54         return(ret);
  55 }
  56
  57 int
  58 _pthread_mutexattr_setprioceiling(pthread_mutexattr_t *mattr, int prioceiling)
  59 {
  60         int ret = 0;
  61
  62         if ((mattr == NULL) || (*mattr == NULL))
  63                 ret = EINVAL;
  64         else if ((*mattr)->m_protocol != PTHREAD_PRIO_PROTECT)
  65                 ret = EINVAL;
  66         else
  67                 (*mattr)->m_ceiling = prioceiling;
  68
  69         return(ret);
  70 }
  71
  72 int
  73 _pthread_mutex_getprioceiling(pthread_mutex_t *mutex,
  74         int *prioceiling)
  75 {
  76         int ret = 0;
  77
  78         if ((mutex == NULL) || (*mutex == NULL))
  79                 ret = EINVAL;
  80         else if ((*mutex)->m_protocol != PTHREAD_PRIO_PROTECT)
  81                 ret = EINVAL;
  82         else
  83                 *prioceiling = (*mutex)->m_prio;
  84
  85         return(ret);
  86 }
  87
  88 int
  89 _pthread_mutex_setprioceiling(pthread_mutex_t *mutex,
  90                               int prioceiling, int *old_ceiling)
  91 {
  92         int ret = 0;
  93         int tmp;
  94
  95         if ((mutex == NULL) || (*mutex == NULL))
  96                 ret = EINVAL;
  97         else if ((*mutex)->m_protocol != PTHREAD_PRIO_PROTECT)
  98                 ret = EINVAL;
  99         else if ((ret = _pthread_mutex_lock(mutex)) == 0) {
 100                 tmp = (*mutex)->m_prio;
 101                 (*mutex)->m_prio = prioceiling;
 102                 ret = _pthread_mutex_unlock(mutex);
 103                 *old_ceiling = tmp;
 104         }
 105         return(ret);
 106 }
 107
 108 __strong_reference(_pthread_mutexattr_getprioceiling, pthread_mutexattr_getprioceiling);
 109 __strong_reference(_pthread_mutexattr_setprioceiling, pthread_mutexattr_setprioceiling);
 110 __strong_reference(_pthread_mutex_getprioceiling, pthread_mutex_getprioceiling);
 111 __strong_reference(_pthread_mutex_setprioceiling, pthread_mutex_setprioceiling);
 112