1/* 2 * pthread_mutexattr_getpshared.c 3 * 4 * Description: 5 * This translation unit implements mutual exclusion (mutex) primitives. 6 * 7 * -------------------------------------------------------------------------- 8 * 9 * Pthreads-win32 - POSIX Threads Library for Win32 10 * Copyright(C) 1998 John E. Bossom 11 * Copyright(C) 1999,2005 Pthreads-win32 contributors 12 * 13 * Contact Email: rpj@callisto.canberra.edu.au 14 * 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 20 * 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. 25 * 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. 30 * 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 35 */ 36 37#include "pthread.h" 38#include "implement.h" 39 40 41int 42pthread_mutexattr_getpshared (const pthread_mutexattr_t * attr, int *pshared) 43 /* 44 * ------------------------------------------------------ 45 * DOCPUBLIC 46 * Determine whether mutexes created with 'attr' can be 47 * shared between processes. 48 * 49 * PARAMETERS 50 * attr 51 * pointer to an instance of pthread_mutexattr_t 52 * 53 * pshared 54 * will be set to one of: 55 * 56 * PTHREAD_PROCESS_SHARED 57 * May be shared if in shared memory 58 * 59 * PTHREAD_PROCESS_PRIVATE 60 * Cannot be shared. 61 * 62 * 63 * DESCRIPTION 64 * Mutexes creatd with 'attr' can be shared between 65 * processes if pthread_mutex_t variable is allocated 66 * in memory shared by these processes. 67 * NOTES: 68 * 1) pshared mutexes MUST be allocated in shared 69 * memory. 70 * 2) The following macro is defined if shared mutexes 71 * are supported: 72 * _POSIX_THREAD_PROCESS_SHARED 73 * 74 * RESULTS 75 * 0 successfully retrieved attribute, 76 * EINVAL 'attr' is invalid, 77 * 78 * ------------------------------------------------------ 79 */ 80{ 81 int result; 82 83 if ((attr != NULL && *attr != NULL) && (pshared != NULL)) 84 { 85 *pshared = (*attr)->pshared; 86 result = 0; 87 } 88 else 89 { 90 result = EINVAL; 91 } 92 93 return (result); 94 95} /* pthread_mutexattr_getpshared */ 96