1*062c5bc4SJason Schmidlapp /*
2*062c5bc4SJason Schmidlapp * pthread_mutexattr_setpshared.c
3*062c5bc4SJason Schmidlapp *
4*062c5bc4SJason Schmidlapp * Description:
5*062c5bc4SJason Schmidlapp * This translation unit implements mutual exclusion (mutex) primitives.
6*062c5bc4SJason Schmidlapp *
7*062c5bc4SJason Schmidlapp * --------------------------------------------------------------------------
8*062c5bc4SJason Schmidlapp *
9*062c5bc4SJason Schmidlapp * Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
10*062c5bc4SJason Schmidlapp * Copyright(C) 2008 Jason Schmidlapp
11*062c5bc4SJason Schmidlapp *
12*062c5bc4SJason Schmidlapp * Contact Email: jschmidlapp@users.sourceforge.net
13*062c5bc4SJason Schmidlapp *
14*062c5bc4SJason Schmidlapp *
15*062c5bc4SJason Schmidlapp * Based upon Pthreads-win32 - POSIX Threads Library for Win32
16*062c5bc4SJason Schmidlapp * Copyright(C) 1998 John E. Bossom
17*062c5bc4SJason Schmidlapp * Copyright(C) 1999,2005 Pthreads-win32 contributors
18*062c5bc4SJason Schmidlapp *
19*062c5bc4SJason Schmidlapp * Contact Email: rpj@callisto.canberra.edu.au
20*062c5bc4SJason Schmidlapp *
21*062c5bc4SJason Schmidlapp * The original list of contributors to the Pthreads-win32 project
22*062c5bc4SJason Schmidlapp * is contained in the file CONTRIBUTORS.ptw32 included with the
23*062c5bc4SJason Schmidlapp * source code distribution. The list can also be seen at the
24*062c5bc4SJason Schmidlapp * following World Wide Web location:
25*062c5bc4SJason Schmidlapp * http://sources.redhat.com/pthreads-win32/contributors.html
26*062c5bc4SJason Schmidlapp *
27*062c5bc4SJason Schmidlapp * This library is free software; you can redistribute it and/or
28*062c5bc4SJason Schmidlapp * modify it under the terms of the GNU Lesser General Public
29*062c5bc4SJason Schmidlapp * License as published by the Free Software Foundation; either
30*062c5bc4SJason Schmidlapp * version 2 of the License, or (at your option) any later version.
31*062c5bc4SJason Schmidlapp *
32*062c5bc4SJason Schmidlapp * This library is distributed in the hope that it will be useful,
33*062c5bc4SJason Schmidlapp * but WITHOUT ANY WARRANTY; without even the implied warranty of
34*062c5bc4SJason Schmidlapp * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
35*062c5bc4SJason Schmidlapp * Lesser General Public License for more details.
36*062c5bc4SJason Schmidlapp *
37*062c5bc4SJason Schmidlapp * You should have received a copy of the GNU Lesser General Public
38*062c5bc4SJason Schmidlapp * License along with this library in the file COPYING.LIB;
39*062c5bc4SJason Schmidlapp * if not, write to the Free Software Foundation, Inc.,
40*062c5bc4SJason Schmidlapp * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
41*062c5bc4SJason Schmidlapp */
42*062c5bc4SJason Schmidlapp
43*062c5bc4SJason Schmidlapp #include "pthread.h"
44*062c5bc4SJason Schmidlapp #include "implement.h"
45*062c5bc4SJason Schmidlapp
46*062c5bc4SJason Schmidlapp
47*062c5bc4SJason Schmidlapp int
pthread_mutexattr_setpshared(pthread_mutexattr_t * attr,int pshared)48*062c5bc4SJason Schmidlapp pthread_mutexattr_setpshared (pthread_mutexattr_t * attr, int pshared)
49*062c5bc4SJason Schmidlapp /*
50*062c5bc4SJason Schmidlapp * ------------------------------------------------------
51*062c5bc4SJason Schmidlapp * DOCPUBLIC
52*062c5bc4SJason Schmidlapp * Mutexes created with 'attr' can be shared between
53*062c5bc4SJason Schmidlapp * processes if pthread_mutex_t variable is allocated
54*062c5bc4SJason Schmidlapp * in memory shared by these processes.
55*062c5bc4SJason Schmidlapp *
56*062c5bc4SJason Schmidlapp * PARAMETERS
57*062c5bc4SJason Schmidlapp * attr
58*062c5bc4SJason Schmidlapp * pointer to an instance of pthread_mutexattr_t
59*062c5bc4SJason Schmidlapp *
60*062c5bc4SJason Schmidlapp * pshared
61*062c5bc4SJason Schmidlapp * must be 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 * DESCRIPTION
70*062c5bc4SJason Schmidlapp * Mutexes creatd with 'attr' can be shared between
71*062c5bc4SJason Schmidlapp * processes if pthread_mutex_t variable is allocated
72*062c5bc4SJason Schmidlapp * in memory shared by these processes.
73*062c5bc4SJason Schmidlapp *
74*062c5bc4SJason Schmidlapp * NOTES:
75*062c5bc4SJason Schmidlapp * 1) pshared mutexes MUST be allocated in shared
76*062c5bc4SJason Schmidlapp * 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 set attribute,
84*062c5bc4SJason Schmidlapp * EINVAL 'attr' or pshared is invalid,
85*062c5bc4SJason Schmidlapp * ENOSYS PTHREAD_PROCESS_SHARED not supported,
86*062c5bc4SJason Schmidlapp *
87*062c5bc4SJason Schmidlapp * ------------------------------------------------------
88*062c5bc4SJason Schmidlapp */
89*062c5bc4SJason Schmidlapp {
90*062c5bc4SJason Schmidlapp int result;
91*062c5bc4SJason Schmidlapp
92*062c5bc4SJason Schmidlapp if ((attr != NULL && *attr != NULL) &&
93*062c5bc4SJason Schmidlapp ((pshared == PTHREAD_PROCESS_SHARED) ||
94*062c5bc4SJason Schmidlapp (pshared == PTHREAD_PROCESS_PRIVATE)))
95*062c5bc4SJason Schmidlapp {
96*062c5bc4SJason Schmidlapp if (pshared == PTHREAD_PROCESS_SHARED)
97*062c5bc4SJason Schmidlapp {
98*062c5bc4SJason Schmidlapp
99*062c5bc4SJason Schmidlapp #if !defined( _POSIX_THREAD_PROCESS_SHARED )
100*062c5bc4SJason Schmidlapp
101*062c5bc4SJason Schmidlapp result = ENOSYS;
102*062c5bc4SJason Schmidlapp pshared = PTHREAD_PROCESS_PRIVATE;
103*062c5bc4SJason Schmidlapp
104*062c5bc4SJason Schmidlapp #else
105*062c5bc4SJason Schmidlapp
106*062c5bc4SJason Schmidlapp result = 0;
107*062c5bc4SJason Schmidlapp
108*062c5bc4SJason Schmidlapp #endif /* _POSIX_THREAD_PROCESS_SHARED */
109*062c5bc4SJason Schmidlapp
110*062c5bc4SJason Schmidlapp }
111*062c5bc4SJason Schmidlapp else
112*062c5bc4SJason Schmidlapp {
113*062c5bc4SJason Schmidlapp result = 0;
114*062c5bc4SJason Schmidlapp }
115*062c5bc4SJason Schmidlapp
116*062c5bc4SJason Schmidlapp (*attr)->pshared = pshared;
117*062c5bc4SJason Schmidlapp }
118*062c5bc4SJason Schmidlapp else
119*062c5bc4SJason Schmidlapp {
120*062c5bc4SJason Schmidlapp result = EINVAL;
121*062c5bc4SJason Schmidlapp }
122*062c5bc4SJason Schmidlapp
123*062c5bc4SJason Schmidlapp return (result);
124*062c5bc4SJason Schmidlapp
125*062c5bc4SJason Schmidlapp } /* pthread_mutexattr_setpshared */
126