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