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Create releng/7.2 from stable/7 in preparation for 7.2-RELEASE.
[FreeBSD/releng/7.2.git] / lib / libkse / 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  * $FreeBSD$
33  */
34 #include <string.h>
35 #include <stdlib.h>
36 #include <errno.h>
37 #include <pthread.h>
38 #include "thr_private.h"
39
40 LT10_COMPAT_PRIVATE(_pthread_mutexattr_getprioceiling);
41 LT10_COMPAT_DEFAULT(pthread_mutexattr_getprioceiling);
42 LT10_COMPAT_PRIVATE(_pthread_mutexattr_setprioceiling);
43 LT10_COMPAT_DEFAULT(pthread_mutexattr_setprioceiling);
44 LT10_COMPAT_PRIVATE(_pthread_mutex_getprioceiling);
45 LT10_COMPAT_DEFAULT(pthread_mutex_getprioceiling);
46 LT10_COMPAT_PRIVATE(_pthread_mutex_setprioceiling);
47 LT10_COMPAT_DEFAULT(pthread_mutex_setprioceiling);
48
49 __weak_reference(_pthread_mutexattr_getprioceiling, pthread_mutexattr_getprioceiling);
50 __weak_reference(_pthread_mutexattr_setprioceiling, pthread_mutexattr_setprioceiling);
51 __weak_reference(_pthread_mutex_getprioceiling, pthread_mutex_getprioceiling);
52 __weak_reference(_pthread_mutex_setprioceiling, pthread_mutex_setprioceiling);
53
54 int
55 _pthread_mutexattr_getprioceiling(pthread_mutexattr_t *mattr, int *prioceiling)
56 {
57         int ret = 0;
58
59         if ((mattr == NULL) || (*mattr == NULL))
60                 ret = EINVAL;
61         else if ((*mattr)->m_protocol != PTHREAD_PRIO_PROTECT)
62                 ret = EINVAL;
63         else
64                 *prioceiling = (*mattr)->m_ceiling;
65
66         return(ret);
67 }
68
69 int
70 _pthread_mutexattr_setprioceiling(pthread_mutexattr_t *mattr, int prioceiling)
71 {
72         int ret = 0;
73
74         if ((mattr == NULL) || (*mattr == NULL))
75                 ret = EINVAL;
76         else if ((*mattr)->m_protocol != PTHREAD_PRIO_PROTECT)
77                 ret = EINVAL;
78         else
79                 (*mattr)->m_ceiling = prioceiling;
80
81         return(ret);
82 }
83
84 int
85 _pthread_mutex_getprioceiling(pthread_mutex_t *mutex,
86                               int *prioceiling)
87 {
88         int ret;
89
90         if ((mutex == NULL) || (*mutex == NULL))
91                 ret = EINVAL;
92         else if ((*mutex)->m_protocol != PTHREAD_PRIO_PROTECT)
93                 ret = EINVAL;
94         else
95                 ret = (*mutex)->m_prio;
96
97         return(ret);
98 }
99
100 int
101 _pthread_mutex_setprioceiling(pthread_mutex_t *mutex,
102                               int prioceiling, int *old_ceiling)
103 {
104         int ret = 0;
105         int tmp;
106
107         if ((mutex == NULL) || (*mutex == NULL))
108                 ret = EINVAL;
109         else if ((*mutex)->m_protocol != PTHREAD_PRIO_PROTECT)
110                 ret = EINVAL;
111         /* Lock the mutex: */
112         else if ((ret = pthread_mutex_lock(mutex)) == 0) {
113                 tmp = (*mutex)->m_prio;
114                 /* Set the new ceiling: */
115                 (*mutex)->m_prio = prioceiling;
116
117                 /* Unlock the mutex: */
118                 ret = pthread_mutex_unlock(mutex);
119
120                 /* Return the old ceiling: */
121                 *old_ceiling = tmp;
122         }
123         return(ret);
124 }