1 /* 2 * pthread_condattr_setpshared.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_setpshared (pthread_condattr_t * attr, int pshared) 44 /* 45 * ------------------------------------------------------ 46 * DOCPUBLIC 47 * Mutexes created with 'attr' can be shared between 48 * processes if pthread_mutex_t variable is allocated 49 * in memory shared by these processes. 50 * 51 * PARAMETERS 52 * attr 53 * pointer to an instance of pthread_mutexattr_t 54 * 55 * pshared 56 * must be one of: 57 * 58 * PTHREAD_PROCESS_SHARED 59 * May be shared if in shared memory 60 * 61 * PTHREAD_PROCESS_PRIVATE 62 * Cannot be shared. 63 * 64 * DESCRIPTION 65 * Mutexes creatd with 'attr' can be shared between 66 * processes if pthread_mutex_t variable is allocated 67 * in memory shared by these processes. 68 * 69 * NOTES: 70 * 1) pshared mutexes MUST be allocated in shared 71 * memory. 72 * 73 * 2) The following macro is defined if shared mutexes 74 * are supported: 75 * _POSIX_THREAD_PROCESS_SHARED 76 * 77 * RESULTS 78 * 0 successfully set attribute, 79 * EINVAL 'attr' or pshared is invalid, 80 * ENOSYS PTHREAD_PROCESS_SHARED not supported, 81 * 82 * ------------------------------------------------------ 83 */ 84 { 85 int result; 86 87 if ((attr != NULL && *attr != NULL) 88 && ((pshared == PTHREAD_PROCESS_SHARED) 89 || (pshared == PTHREAD_PROCESS_PRIVATE))) 90 { 91 if (pshared == PTHREAD_PROCESS_SHARED) 92 { 93 94 #if !defined( _POSIX_THREAD_PROCESS_SHARED ) 95 result = ENOSYS; 96 pshared = PTHREAD_PROCESS_PRIVATE; 97 #else 98 result = 0; 99 100 #endif /* _POSIX_THREAD_PROCESS_SHARED */ 101 102 } 103 else 104 { 105 result = 0; 106 } 107 108 (*attr)->pshared = pshared; 109 } 110 else 111 { 112 result = EINVAL; 113 } 114 115 return result; 116 117 } /* pthread_condattr_setpshared */ 118
