1 /*
2 * pthread_condattr_getpshared.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 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
36 */
37
38 #include "pthread.h"
39 #include "implement.h"
40
41
42 int
pthread_condattr_getpshared(const pthread_condattr_t * attr,int * pshared)43 pthread_condattr_getpshared (const pthread_condattr_t * attr, int *pshared)
44 /*
45 * ------------------------------------------------------
46 * DOCPUBLIC
47 * Determine whether condition variables created with 'attr'
48 * can be shared between processes.
49 *
50 * PARAMETERS
51 * attr
52 * pointer to an instance of pthread_condattr_t
53 *
54 * pshared
55 * will be set to one of:
56 *
57 * PTHREAD_PROCESS_SHARED
58 * May be shared if in shared memory
59 *
60 * PTHREAD_PROCESS_PRIVATE
61 * Cannot be shared.
62 *
63 *
64 * DESCRIPTION
65 * Condition Variables created with 'attr' can be shared
66 * between processes if pthread_cond_t variable is allocated
67 * in memory shared by these processes.
68 * NOTES:
69 * 1) pshared condition variables MUST be allocated in
70 * shared memory.
71 *
72 * 2) The following macro is defined if shared mutexes
73 * are supported:
74 * _POSIX_THREAD_PROCESS_SHARED
75 *
76 * RESULTS
77 * 0 successfully retrieved attribute,
78 * EINVAL 'attr' or 'pshared' is invalid,
79 *
80 * ------------------------------------------------------
81 */
82 {
83 int result;
84
85 if ((attr != NULL && *attr != NULL) && (pshared != NULL))
86 {
87 *pshared = (*attr)->pshared;
88 result = 0;
89 }
90 else
91 {
92 result = EINVAL;
93 }
94
95 return result;
96
97 } /* pthread_condattr_getpshared */
98