2 * pthread_rwlockattr_setpshared.c
5 * This translation unit implements read/write lock primitives.
7 * --------------------------------------------------------------------------
9 * Pthreads-win32 - POSIX Threads Library for Win32
10 * Copyright(C) 1998 John E. Bossom
11 * Copyright(C) 1999,2002 Pthreads-win32 contributors
13 * Contact Email: rpj@ise.canberra.edu.au
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
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.
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.
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
40 //#include "pthread.h"
41 //#include "implement.h"
46 pthread_rwlockattr_setpshared (pthread_rwlockattr_t * attr,
49 * ------------------------------------------------------
51 * Rwlocks created with 'attr' can be shared between
52 * processes if pthread_rwlock_t variable is allocated
53 * in memory shared by these processes.
57 * pointer to an instance of pthread_rwlockattr_t
62 * PTHREAD_PROCESS_SHARED
63 * May be shared if in shared memory
65 * PTHREAD_PROCESS_PRIVATE
69 * Rwlocks creatd with 'attr' can be shared between
70 * processes if pthread_rwlock_t variable is allocated
71 * in memory shared by these processes.
74 * 1) pshared rwlocks MUST be allocated in shared
77 * 2) The following macro is defined if shared rwlocks
79 * _POSIX_THREAD_PROCESS_SHARED
82 * 0 successfully set attribute,
83 * EINVAL 'attr' or pshared is invalid,
84 * ENOSYS PTHREAD_PROCESS_SHARED not supported,
86 * ------------------------------------------------------
91 if ((attr != NULL && *attr != NULL) &&
92 ((pshared == PTHREAD_PROCESS_SHARED) ||
93 (pshared == PTHREAD_PROCESS_PRIVATE)))
95 if (pshared == PTHREAD_PROCESS_SHARED)
98 #if !defined( _POSIX_THREAD_PROCESS_SHARED )
101 pshared = PTHREAD_PROCESS_PRIVATE;
107 #endif /* _POSIX_THREAD_PROCESS_SHARED */
115 (*attr)->pshared = pshared;
124 } /* pthread_rwlockattr_setpshared */