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 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
36 */
37
38#include "pthread.h"
39#include "implement.h"
40
41
42int
43pthread_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