lib/libc_r/uthread/uthread_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  * $FreeBSD: src/lib/libc_r/uthread/uthread_mutex_prioceiling.c,v 1.3.2.1 2002/10/22 14:44:03 fjoe Exp $
  33  */
  34 #include <string.h>
  35 #include <stdlib.h>
  36 #include <errno.h>
  37 #include <pthread.h>
  38 #include "pthread_private.h"
  39
  40 int
  41 _pthread_mutexattr_getprioceiling(pthread_mutexattr_t * __restrict mattr,
  42     int * __restrict prioceiling)
  43 {
  44         int ret = 0;
  45
  46         if ((mattr == NULL) || (*mattr == NULL))
  47                 ret = EINVAL;
  48         else if ((*mattr)->m_protocol != PTHREAD_PRIO_PROTECT)
  49                 ret = EINVAL;
  50         else
  51                 *prioceiling = (*mattr)->m_ceiling;
  52
  53         return(ret);
  54 }
  55
  56 int
  57 _pthread_mutexattr_setprioceiling(pthread_mutexattr_t *mattr, int prioceiling)
  58 {
  59         int ret = 0;
  60
  61         if ((mattr == NULL) || (*mattr == NULL))
  62                 ret = EINVAL;
  63         else if ((*mattr)->m_protocol != PTHREAD_PRIO_PROTECT)
  64                 ret = EINVAL;
  65         else
  66                 (*mattr)->m_ceiling = prioceiling;
  67
  68         return(ret);
  69 }
  70
  71 int
  72 _pthread_mutex_getprioceiling(pthread_mutex_t * __restrict mutex,
  73     int * __restrict prioceiling)
  74 {
  75         int ret;
  76
  77         if ((mutex == NULL) || (*mutex == NULL))
  78                 ret = EINVAL;
  79         else if ((*mutex)->m_protocol != PTHREAD_PRIO_PROTECT)
  80                 ret = EINVAL;
  81         else
  82                 ret = (*mutex)->m_prio;
  83
  84         return(ret);
  85 }
  86
  87 int
  88 _pthread_mutex_setprioceiling(pthread_mutex_t * __restrict mutex,
  89     int prioceiling, int * __restrict old_ceiling)
  90 {
  91         int ret = 0;
  92
  93         if ((mutex == NULL) || (*mutex == NULL))
  94                 ret = EINVAL;
  95         else if ((*mutex)->m_protocol != PTHREAD_PRIO_PROTECT)
  96                 ret = EINVAL;
  97         else {
  98                 /* Lock the mutex: */
  99                 if ((ret = pthread_mutex_lock(mutex)) == 0) {
 100                         /* Return the old ceiling and set the new ceiling: */
 101                         *old_ceiling = (*mutex)->m_prio;
 102                         (*mutex)->m_prio = prioceiling;
 103
 104                         /* Unlock the mutex: */
 105                         ret = pthread_mutex_unlock(mutex);
 106                 }
 107         }
 108         return(ret);
 109 }
 110
 111 __strong_reference(_pthread_mutexattr_getprioceiling, pthread_mutexattr_getprioceiling);
 112 __strong_reference(_pthread_mutexattr_setprioceiling, pthread_mutexattr_setprioceiling);
 113 __strong_reference(_pthread_mutex_getprioceiling, pthread_mutex_getprioceiling);
 114 __strong_reference(_pthread_mutex_setprioceiling, pthread_mutex_setprioceiling);