1 /* 2 * pthread_attr_init.c 3 * 4 * Description: 5 * This translation unit implements operations on thread attribute objects. 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_attr_init (pthread_attr_t * attr) 43 /* 44 * ------------------------------------------------------ 45 * DOCPUBLIC 46 * Initializes a thread attributes object with default 47 * attributes. 48 * 49 * PARAMETERS 50 * attr 51 * pointer to an instance of pthread_attr_t 52 * 53 * 54 * DESCRIPTION 55 * Initializes a thread attributes object with default 56 * attributes. 57 * 58 * NOTES: 59 * 1) Used to define thread attributes 60 * 61 * RESULTS 62 * 0 successfully initialized attr, 63 * ENOMEM insufficient memory for attr. 64 * 65 * ------------------------------------------------------ 66 */ 67 { 68 pthread_attr_t attr_result; 69 70 if (attr == NULL) 71 { 72 /* This is disallowed. */ 73 return EINVAL; 74 } 75 76 attr_result = (pthread_attr_t) malloc (sizeof (*attr_result)); 77 78 if (attr_result == NULL) 79 { 80 return ENOMEM; 81 } 82 83 #if defined(_POSIX_THREAD_ATTR_STACKSIZE) 84 /* 85 * Default to zero size. Unless changed explicitly this 86 * will allow Win32 to set the size to that of the 87 * main thread. 88 */ 89 attr_result->stacksize = 0; 90 #endif 91 92 #if defined(_POSIX_THREAD_ATTR_STACKADDR) 93 /* FIXME: Set this to something sensible when we support it. */ 94 attr_result->stackaddr = NULL; 95 #endif 96 97 attr_result->detachstate = PTHREAD_CREATE_JOINABLE; 98 99 #if defined(HAVE_SIGSET_T) 100 memset (&(attr_result->sigmask), 0, sizeof (sigset_t)); 101 #endif /* HAVE_SIGSET_T */ 102 103 /* 104 * Win32 sets new threads to THREAD_PRIORITY_NORMAL and 105 * not to that of the parent thread. We choose to default to 106 * this arrangement. 107 */ 108 attr_result->param.sched_priority = THREAD_PRIORITY_NORMAL; 109 attr_result->inheritsched = PTHREAD_EXPLICIT_SCHED; 110 attr_result->contentionscope = PTHREAD_SCOPE_SYSTEM; 111 112 attr_result->valid = PTW32_ATTR_VALID; 113 114 *attr = attr_result; 115 116 return 0; 117 } 118