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
42int
43pthread_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