1*062c5bc4SJason Schmidlapp /*
2*062c5bc4SJason Schmidlapp * pthread_condattr_getpshared.c
3*062c5bc4SJason Schmidlapp *
4*062c5bc4SJason Schmidlapp * Description:
5*062c5bc4SJason Schmidlapp * This translation unit implements condition variables and their primitives.
6*062c5bc4SJason Schmidlapp *
7*062c5bc4SJason Schmidlapp *
8*062c5bc4SJason Schmidlapp * --------------------------------------------------------------------------
9*062c5bc4SJason Schmidlapp *
10*062c5bc4SJason Schmidlapp * Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
11*062c5bc4SJason Schmidlapp * Copyright(C) 2008 Jason Schmidlapp
12*062c5bc4SJason Schmidlapp *
13*062c5bc4SJason Schmidlapp * Contact Email: jschmidlapp@users.sourceforge.net
14*062c5bc4SJason Schmidlapp *
15*062c5bc4SJason Schmidlapp *
16*062c5bc4SJason Schmidlapp * Based upon Pthreads-win32 - POSIX Threads Library for Win32
17*062c5bc4SJason Schmidlapp * Copyright(C) 1998 John E. Bossom
18*062c5bc4SJason Schmidlapp * Copyright(C) 1999,2005 Pthreads-win32 contributors
19*062c5bc4SJason Schmidlapp *
20*062c5bc4SJason Schmidlapp * Contact Email: rpj@callisto.canberra.edu.au
21*062c5bc4SJason Schmidlapp *
22*062c5bc4SJason Schmidlapp * The original list of contributors to the Pthreads-win32 project
23*062c5bc4SJason Schmidlapp * is contained in the file CONTRIBUTORS.ptw32 included with the
24*062c5bc4SJason Schmidlapp * source code distribution. The list can also be seen at the
25*062c5bc4SJason Schmidlapp * following World Wide Web location:
26*062c5bc4SJason Schmidlapp * http://sources.redhat.com/pthreads-win32/contributors.html
27*062c5bc4SJason Schmidlapp *
28*062c5bc4SJason Schmidlapp * This library is free software; you can redistribute it and/or
29*062c5bc4SJason Schmidlapp * modify it under the terms of the GNU Lesser General Public
30*062c5bc4SJason Schmidlapp * License as published by the Free Software Foundation; either
31*062c5bc4SJason Schmidlapp * version 2 of the License, or (at your option) any later version.
32*062c5bc4SJason Schmidlapp *
33*062c5bc4SJason Schmidlapp * This library is distributed in the hope that it will be useful,
34*062c5bc4SJason Schmidlapp * but WITHOUT ANY WARRANTY; without even the implied warranty of
35*062c5bc4SJason Schmidlapp * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
36*062c5bc4SJason Schmidlapp * Lesser General Public License for more details.
37*062c5bc4SJason Schmidlapp *
38*062c5bc4SJason Schmidlapp * You should have received a copy of the GNU Lesser General Public
39*062c5bc4SJason Schmidlapp * License along with this library in the file COPYING.LIB;
40*062c5bc4SJason Schmidlapp * if not, write to the Free Software Foundation, Inc.,
41*062c5bc4SJason Schmidlapp * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
42*062c5bc4SJason Schmidlapp */
43*062c5bc4SJason Schmidlapp
44*062c5bc4SJason Schmidlapp #include "pthread.h"
45*062c5bc4SJason Schmidlapp #include "implement.h"
46*062c5bc4SJason Schmidlapp
47*062c5bc4SJason Schmidlapp
48*062c5bc4SJason Schmidlapp int
pthread_condattr_getpshared(const pthread_condattr_t * attr,int * pshared)49*062c5bc4SJason Schmidlapp pthread_condattr_getpshared (const pthread_condattr_t * attr, int *pshared)
50*062c5bc4SJason Schmidlapp /*
51*062c5bc4SJason Schmidlapp * ------------------------------------------------------
52*062c5bc4SJason Schmidlapp * DOCPUBLIC
53*062c5bc4SJason Schmidlapp * Determine whether condition variables created with 'attr'
54*062c5bc4SJason Schmidlapp * can be shared between processes.
55*062c5bc4SJason Schmidlapp *
56*062c5bc4SJason Schmidlapp * PARAMETERS
57*062c5bc4SJason Schmidlapp * attr
58*062c5bc4SJason Schmidlapp * pointer to an instance of pthread_condattr_t
59*062c5bc4SJason Schmidlapp *
60*062c5bc4SJason Schmidlapp * pshared
61*062c5bc4SJason Schmidlapp * will be set to one of:
62*062c5bc4SJason Schmidlapp *
63*062c5bc4SJason Schmidlapp * PTHREAD_PROCESS_SHARED
64*062c5bc4SJason Schmidlapp * May be shared if in shared memory
65*062c5bc4SJason Schmidlapp *
66*062c5bc4SJason Schmidlapp * PTHREAD_PROCESS_PRIVATE
67*062c5bc4SJason Schmidlapp * Cannot be shared.
68*062c5bc4SJason Schmidlapp *
69*062c5bc4SJason Schmidlapp *
70*062c5bc4SJason Schmidlapp * DESCRIPTION
71*062c5bc4SJason Schmidlapp * Condition Variables created with 'attr' can be shared
72*062c5bc4SJason Schmidlapp * between processes if pthread_cond_t variable is allocated
73*062c5bc4SJason Schmidlapp * in memory shared by these processes.
74*062c5bc4SJason Schmidlapp * NOTES:
75*062c5bc4SJason Schmidlapp * 1) pshared condition variables MUST be allocated in
76*062c5bc4SJason Schmidlapp * shared memory.
77*062c5bc4SJason Schmidlapp *
78*062c5bc4SJason Schmidlapp * 2) The following macro is defined if shared mutexes
79*062c5bc4SJason Schmidlapp * are supported:
80*062c5bc4SJason Schmidlapp * _POSIX_THREAD_PROCESS_SHARED
81*062c5bc4SJason Schmidlapp *
82*062c5bc4SJason Schmidlapp * RESULTS
83*062c5bc4SJason Schmidlapp * 0 successfully retrieved attribute,
84*062c5bc4SJason Schmidlapp * EINVAL 'attr' or 'pshared' is invalid,
85*062c5bc4SJason Schmidlapp *
86*062c5bc4SJason Schmidlapp * ------------------------------------------------------
87*062c5bc4SJason Schmidlapp */
88*062c5bc4SJason Schmidlapp {
89*062c5bc4SJason Schmidlapp int result;
90*062c5bc4SJason Schmidlapp
91*062c5bc4SJason Schmidlapp if ((attr != NULL && *attr != NULL) && (pshared != NULL))
92*062c5bc4SJason Schmidlapp {
93*062c5bc4SJason Schmidlapp *pshared = (*attr)->pshared;
94*062c5bc4SJason Schmidlapp result = 0;
95*062c5bc4SJason Schmidlapp }
96*062c5bc4SJason Schmidlapp else
97*062c5bc4SJason Schmidlapp {
98*062c5bc4SJason Schmidlapp result = EINVAL;
99*062c5bc4SJason Schmidlapp }
100*062c5bc4SJason Schmidlapp
101*062c5bc4SJason Schmidlapp return result;
102*062c5bc4SJason Schmidlapp
103*062c5bc4SJason Schmidlapp } /* pthread_condattr_getpshared */
104