1 /*
2 * pthread_condattr_setpshared.c
3 *
4 * Description:
5 * This translation unit implements condition variables and their primitives.
6 *
7 *
8 * --------------------------------------------------------------------------
9 *
10 * Pthreads-win32 - POSIX Threads Library for Win32
11 * Copyright(C) 1998 John E. Bossom
12 * Copyright(C) 1999,2005 Pthreads-win32 contributors
13 *
14 * Contact Email: rpj@callisto.canberra.edu.au
15 *
16 * The current list of contributors is contained
17 * in the file CONTRIBUTORS included with the source
18 * code distribution. The list can also be seen at the
19 * following World Wide Web location:
20 * http://sources.redhat.com/pthreads-win32/contributors.html
21 *
22 * This library is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU Lesser General Public
24 * License as published by the Free Software Foundation; either
25 * version 2 of the License, or (at your option) any later version.
26 *
27 * This library is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
30 * Lesser General Public License for more details.
31 *
32 * You should have received a copy of the GNU Lesser General Public
33 * License along with this library in the file COPYING.LIB;
34 * if not, write to the Free Software Foundation, Inc.,
35 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
36 */
37
38 #include "pthread.h"
39 #include "implement.h"
40
41
42 int
pthread_condattr_setpshared(pthread_condattr_t * attr,int pshared)43 pthread_condattr_setpshared (pthread_condattr_t * attr, int pshared)
44 /*
45 * ------------------------------------------------------
46 * DOCPUBLIC
47 * Mutexes created with 'attr' can be shared between
48 * processes if pthread_mutex_t variable is allocated
49 * in memory shared by these processes.
50 *
51 * PARAMETERS
52 * attr
53 * pointer to an instance of pthread_mutexattr_t
54 *
55 * pshared
56 * must be one of:
57 *
58 * PTHREAD_PROCESS_SHARED
59 * May be shared if in shared memory
60 *
61 * PTHREAD_PROCESS_PRIVATE
62 * Cannot be shared.
63 *
64 * DESCRIPTION
65 * Mutexes creatd with 'attr' can be shared between
66 * processes if pthread_mutex_t variable is allocated
67 * in memory shared by these processes.
68 *
69 * NOTES:
70 * 1) pshared mutexes MUST be allocated in shared
71 * memory.
72 *
73 * 2) The following macro is defined if shared mutexes
74 * are supported:
75 * _POSIX_THREAD_PROCESS_SHARED
76 *
77 * RESULTS
78 * 0 successfully set attribute,
79 * EINVAL 'attr' or pshared is invalid,
80 * ENOSYS PTHREAD_PROCESS_SHARED not supported,
81 *
82 * ------------------------------------------------------
83 */
84 {
85 int result;
86
87 if ((attr != NULL && *attr != NULL)
88 && ((pshared == PTHREAD_PROCESS_SHARED)
89 || (pshared == PTHREAD_PROCESS_PRIVATE)))
90 {
91 if (pshared == PTHREAD_PROCESS_SHARED)
92 {
93
94 #if !defined( _POSIX_THREAD_PROCESS_SHARED )
95 result = ENOSYS;
96 pshared = PTHREAD_PROCESS_PRIVATE;
97 #else
98 result = 0;
99
100 #endif /* _POSIX_THREAD_PROCESS_SHARED */
101
102 }
103 else
104 {
105 result = 0;
106 }
107
108 (*attr)->pshared = pshared;
109 }
110 else
111 {
112 result = EINVAL;
113 }
114
115 return result;
116
117 } /* pthread_condattr_setpshared */
118