1 /*
2 * pthread_barrier_attr_getpshared.c
3 *
4 * Description:
5 * This translation unit implements barrier primitives.
6 *
7 * --------------------------------------------------------------------------
8 *
9 * Pthreads-win32 - POSIX Threads Library for Win32
10 * Copyright(C) 1998 John E. Bossom
11 * Copyright(C) 1999,2005 Pthreads-win32 contributors
12 *
13 * Contact Email: rpj@callisto.canberra.edu.au
14 *
15 * The current list of contributors is contained
16 * in the file CONTRIBUTORS included with the source
17 * code distribution. The list can also be seen at the
18 * following World Wide Web location:
19 * http://sources.redhat.com/pthreads-win32/contributors.html
20 *
21 * This library is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU Lesser General Public
23 * License as published by the Free Software Foundation; either
24 * version 2 of the License, or (at your option) any later version.
25 *
26 * This library is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
29 * Lesser General Public License for more details.
30 *
31 * You should have received a copy of the GNU Lesser General Public
32 * License along with this library in the file COPYING.LIB;
33 * if not, write to the Free Software Foundation, Inc.,
34 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
35 */
36
37 #include "pthread.h"
38 #include "implement.h"
39
40
41 int
pthread_barrierattr_getpshared(const pthread_barrierattr_t * attr,int * pshared)42 pthread_barrierattr_getpshared (const pthread_barrierattr_t * attr,
43 int *pshared)
44 /*
45 * ------------------------------------------------------
46 * DOCPUBLIC
47 * Determine whether barriers created with 'attr' can be
48 * shared between processes.
49 *
50 * PARAMETERS
51 * attr
52 * pointer to an instance of pthread_barrierattr_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 * Mutexes creatd with 'attr' can be shared between
66 * processes if pthread_barrier_t variable is allocated
67 * in memory shared by these processes.
68 * NOTES:
69 * 1) pshared barriers MUST be allocated in shared
70 * memory.
71 * 2) The following macro is defined if shared barriers
72 * are supported:
73 * _POSIX_THREAD_PROCESS_SHARED
74 *
75 * RESULTS
76 * 0 successfully retrieved attribute,
77 * EINVAL 'attr' is invalid,
78 *
79 * ------------------------------------------------------
80 */
81 {
82 int result;
83
84 if ((attr != NULL && *attr != NULL) && (pshared != NULL))
85 {
86 *pshared = (*attr)->pshared;
87 result = 0;
88 }
89 else
90 {
91 result = EINVAL;
92 }
93
94 return (result);
95 } /* pthread_barrierattr_getpshared */
96