1/*
2 * pthread_barrier_attr_setpshared.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
41int
42pthread_barrierattr_setpshared (pthread_barrierattr_t * attr, int pshared)
43     /*
44      * ------------------------------------------------------
45      * DOCPUBLIC
46      *      Barriers created with 'attr' can be shared between
47      *      processes if pthread_barrier_t variable is allocated
48      *      in memory shared by these processes.
49      *
50      * PARAMETERS
51      *      attr
52      *              pointer to an instance of pthread_barrierattr_t
53      *
54      *      pshared
55      *              must be 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      * DESCRIPTION
64      *      Mutexes creatd with 'attr' can be shared between
65      *      processes if pthread_barrier_t variable is allocated
66      *      in memory shared by these processes.
67      *
68      *      NOTES:
69      *              1)      pshared barriers MUST be allocated in shared
70      *                      memory.
71      *
72      *              2)      The following macro is defined if shared barriers
73      *                      are supported:
74      *                              _POSIX_THREAD_PROCESS_SHARED
75      *
76      * RESULTS
77      *              0               successfully set attribute,
78      *              EINVAL          'attr' or pshared is invalid,
79      *              ENOSYS          PTHREAD_PROCESS_SHARED not supported,
80      *
81      * ------------------------------------------------------
82      */
83{
84  int result;
85
86  if ((attr != NULL && *attr != NULL) &&
87      ((pshared == PTHREAD_PROCESS_SHARED) ||
88       (pshared == PTHREAD_PROCESS_PRIVATE)))
89    {
90      if (pshared == PTHREAD_PROCESS_SHARED)
91	{
92
93#if !defined( _POSIX_THREAD_PROCESS_SHARED )
94
95	  result = ENOSYS;
96	  pshared = PTHREAD_PROCESS_PRIVATE;
97
98#else
99
100	  result = 0;
101
102#endif /* _POSIX_THREAD_PROCESS_SHARED */
103
104	}
105      else
106	{
107	  result = 0;
108	}
109
110      (*attr)->pshared = pshared;
111    }
112  else
113    {
114      result = EINVAL;
115    }
116
117  return (result);
118
119}				/* pthread_barrierattr_setpshared */
120