1 /* $OpenBSD: uthread_mutex_prioceiling.c,v 1.2 1999/11/25 07:01:40 d Exp $ */
2 /*
3 * Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by Daniel Eischen.
17 * 4. Neither the name of the author nor the names of any co-contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: uthread_mutex_prioceiling.c,v 1.3 1999/08/28 00:03:40 peter Exp $
34 */
35 #include <string.h>
36 #include <stdlib.h>
37 #include <errno.h>
38 #ifdef _THREAD_SAFE
39 #include <pthread.h>
40 #include "pthread_private.h"
41
42 int
pthread_mutexattr_getprioceiling(pthread_mutexattr_t * mattr,int * prioceiling)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
pthread_mutexattr_setprioceiling(pthread_mutexattr_t * mattr,int prioceiling)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
pthread_mutex_getprioceiling(pthread_mutex_t * mutex,int * prioceiling)73 pthread_mutex_getprioceiling(pthread_mutex_t *mutex,
74 int *prioceiling)
75 {
76 int ret;
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 ret = (*mutex)->m_prio;
84
85 return(ret);
86 }
87
88 int
pthread_mutex_setprioceiling(pthread_mutex_t * mutex,int prioceiling,int * old_ceiling)89 pthread_mutex_setprioceiling(pthread_mutex_t *mutex,
90 int prioceiling, int *old_ceiling)
91 {
92 int ret = 0;
93
94 if ((mutex == NULL) || (*mutex == NULL))
95 ret = EINVAL;
96 else if ((*mutex)->m_protocol != PTHREAD_PRIO_PROTECT)
97 ret = EINVAL;
98 else {
99 /* Lock the mutex: */
100 if ((ret = pthread_mutex_lock(mutex)) == 0) {
101 /* Return the old ceiling and set the new ceiling: */
102 *old_ceiling = (*mutex)->m_prio;
103 (*mutex)->m_prio = prioceiling;
104
105 /* Unlock the mutex: */
106 ret = pthread_mutex_unlock(mutex);
107 }
108 }
109 return(ret);
110 }
111 #endif
112