1 /* 2 * rwlock6.c 3 * 4 * 5 * -------------------------------------------------------------------------- 6 * 7 * Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems 8 * Copyright(C) 2008 Jason Schmidlapp 9 * 10 * Contact Email: jschmidlapp@users.sourceforge.net 11 * 12 * 13 * Based upon Pthreads-win32 - POSIX Threads Library for Win32 14 * Copyright(C) 1998 John E. Bossom 15 * Copyright(C) 1999,2005 Pthreads-win32 contributors 16 * 17 * Contact Email: rpj@callisto.canberra.edu.au 18 * 19 * The original list of contributors to the Pthreads-win32 project 20 * is contained in the file CONTRIBUTORS.ptw32 included with the 21 * source code distribution. The list can also be seen at the 22 * following World Wide Web location: 23 * http://sources.redhat.com/pthreads-win32/contributors.html 24 * 25 * This library is free software; you can redistribute it and/or 26 * modify it under the terms of the GNU Lesser General Public 27 * License as published by the Free Software Foundation; either 28 * version 2 of the License, or (at your option) any later version. 29 * 30 * This library is distributed in the hope that it will be useful, 31 * but WITHOUT ANY WARRANTY; without even the implied warranty of 32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 33 * Lesser General Public License for more details. 34 * 35 * You should have received a copy of the GNU Lesser General Public 36 * License along with this library in the file COPYING.LIB; 37 * if not, write to the Free Software Foundation, Inc., 38 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 39 * 40 * -------------------------------------------------------------------------- 41 * 42 * Check writer and reader locking 43 * 44 * Depends on API functions: 45 * pthread_rwlock_rdlock() 46 * pthread_rwlock_wrlock() 47 * pthread_rwlock_unlock() 48 */ 49 50 #include "test.h" 51 52 static pthread_rwlock_t rwlock1 = PTHREAD_RWLOCK_INITIALIZER; 53 54 static int bankAccount = 0; 55 56 static void * wrfunc(void * arg) 57 { 58 int ba; 59 60 assert(pthread_rwlock_wrlock(&rwlock1) == 0); 61 pte_osThreadSleep(2000); 62 bankAccount += 10; 63 ba = bankAccount; 64 assert(pthread_rwlock_unlock(&rwlock1) == 0); 65 66 return ((void *) ba); 67 } 68 69 static void * rdfunc(void * arg) 70 { 71 int ba; 72 73 assert(pthread_rwlock_rdlock(&rwlock1) == 0); 74 ba = bankAccount; 75 assert(pthread_rwlock_unlock(&rwlock1) == 0); 76 77 return ((void *) ba); 78 } 79 80 int pthread_test_rwlock6() 81 { 82 pthread_t wrt1; 83 pthread_t wrt2; 84 pthread_t rdt; 85 int wr1Result = 0; 86 int wr2Result = 0; 87 int rdResult = 0; 88 89 rwlock1 = PTHREAD_RWLOCK_INITIALIZER; 90 91 bankAccount = 0; 92 93 assert(pthread_create(&wrt1, NULL, wrfunc, NULL) == 0); 94 pte_osThreadSleep(500); 95 assert(pthread_create(&rdt, NULL, rdfunc, NULL) == 0); 96 pte_osThreadSleep(500); 97 assert(pthread_create(&wrt2, NULL, wrfunc, NULL) == 0); 98 99 assert(pthread_join(wrt1, (void **) &wr1Result) == 0); 100 assert(pthread_join(rdt, (void **) &rdResult) == 0); 101 assert(pthread_join(wrt2, (void **) &wr2Result) == 0); 102 103 assert(wr1Result == 10); 104 assert(rdResult == 10); 105 assert(wr2Result == 20); 106 107 assert(pthread_rwlock_destroy(&rwlock1) == 0); 108 109 return 0; 110 } 111