1 /* 2 * pthread_barrier_attr_getpshared.c 3 * 4 * Description: 5 * This translation unit implements barrier 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 (at) 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 41 int 42 pthread_barrierattr_getpshared (const pthread_barrierattr_t * attr, 43 int *pshared) 44 /* 45 * ------------------------------------------------------ 46 * DOCPUBLIC 47 * Determine whether barriers created with 'attr' can be 48 * shared between processes. 49 * 50 * PARAMETERS 51 * attr 52 * pointer to an instance of pthread_barrierattr_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 * Mutexes creatd with 'attr' can be shared between 66 * processes if pthread_barrier_t variable is allocated 67 * in memory shared by these processes. 68 * NOTES: 69 * 1) pshared barriers MUST be allocated in shared 70 * memory. 71 * 2) The following macro is defined if shared barriers 72 * are supported: 73 * _POSIX_THREAD_PROCESS_SHARED 74 * 75 * RESULTS 76 * 0 successfully retrieved attribute, 77 * EINVAL 'attr' is invalid, 78 * 79 * ------------------------------------------------------ 80 */ 81 { 82 int result; 83 84 if ((attr != NULL && *attr != NULL) && (pshared != NULL)) 85 { 86 *pshared = (*attr)->pshared; 87 result = 0; 88 } 89 else 90 { 91 result = EINVAL; 92 } 93 94 return (result); 95 } /* pthread_barrierattr_getpshared */ 96
