1/* 2 * Copyright (c) 2002, Intel Corporation. All rights reserved. 3 * This file is licensed under the GPL license. For the full content 4 * of this license, see the COPYING file at the top level of this 5 * source tree. 6 7 * Test that pthread_rwlock_timedwrlock(pthread_rwlock_t *rwlock) 8 * 9 * The timeout shall expire when the absolute time specified by abs_timeout passes, 10 * as measured by the clock on which timeouts are based (that is, when the 11 * value of that clock equals or exceeds abs_timeout), or if the absolute time 12 * specified by abs_timeout has already been passed at the time of the call. 13 * 14 * Steps: 15 * 1. Initialize 'rwlock' 16 * 2. Main thread locks 'rwlock' for writing with pthread_rwlock_wrlock() 17 * 3. Create a child thread, specify a 'abs_timeout' as being the current time _minus_ a 18 * timeout period, meaning this will ensure that the abs_timeout would have already 19 * passed. 20 * 4. The thread locks 'rwlock' for writing, using pthread_rwlock_timedwrlock(). Should 21 * get an ETIMEOUT error. 22 */ 23 24#define _XOPEN_SOURCE 600 25 26#include <pthread.h> 27#include <stdio.h> 28#include <stdlib.h> 29#include <unistd.h> 30#include <errno.h> 31#include "posixtest.h" 32 33#define TIMEOUT 1 34 35static pthread_rwlock_t rwlock; 36static int thread_state; 37static int currsec1, currsec2; 38static int expired; 39 40/* thread_state indicates child thread state: 41 1: not in child thread yet; 42 2: just enter child thread ; 43 3: just before child thread exit; 44*/ 45 46#define NOT_CREATED_THREAD 1 47#define ENTERED_THREAD 2 48#define EXITING_THREAD 3 49 50static void* fn(void *arg) 51{ 52 struct timespec abs_timeout; 53 int rc; 54 thread_state = ENTERED_THREAD; 55 56 /* Absolute time, not relative. */ 57 abs_timeout.tv_sec = currsec1 - TIMEOUT; 58 abs_timeout.tv_nsec = 0; 59 60 printf("thread: attempt timed write-lock\n"); 61 rc = pthread_rwlock_timedwrlock(&rwlock, &abs_timeout); 62 if(rc == ETIMEDOUT) 63 { 64 printf("thread: timer expired\n"); 65 expired = 1; 66 } 67 else if(rc == 0) 68 { 69 printf("thread: acquired write lock\n"); 70 expired = 0; 71 printf("thread: unlock write lock\n"); 72 if(pthread_rwlock_unlock(&rwlock) != 0) 73 { 74 printf("thread: failed to release lock\n"); 75 exit(PTS_UNRESOLVED); 76 } 77 } 78 else 79 { 80 printf("Error in pthread_rwlock_timedwrlock(), error code:%d.\n", rc); 81 exit(PTS_UNRESOLVED); 82 } 83 84 /* Get time after the mutex timed out in locking. */ 85 currsec2 = time(NULL); 86 thread_state = EXITING_THREAD; 87 pthread_exit(0); 88 return NULL; 89} 90 91int main() 92{ 93 int cnt = 0; 94 pthread_t thread1; 95 96 if(pthread_rwlock_init(&rwlock, NULL) != 0) 97 { 98 printf("Error at pthread_rwlock_init()\n"); 99 return PTS_UNRESOLVED; 100 } 101 102 printf("main: attempt write lock\n"); 103 /* We have no lock, this write lock should succeed */ 104 if(pthread_rwlock_wrlock(&rwlock) != 0) 105 { 106 printf("Error at pthread_rwlock_wrlock()\n"); 107 return PTS_UNRESOLVED; 108 } 109 printf("main: acquired write lock\n"); 110 111 thread_state = NOT_CREATED_THREAD; 112 printf("main: create thread\n"); 113 if(pthread_create(&thread1, NULL, fn, NULL) != 0) 114 { 115 printf("Error creating thread\n"); 116 return PTS_UNRESOLVED; 117 } 118 119 /* If the shared data is not altered by child after 3 seconds, 120 we regard it as blocked */ 121 /* We expect the thread _NOT_ to block */ 122 cnt = 0; 123 do{ 124 sleep(1); 125 }while (thread_state !=EXITING_THREAD && cnt++ < 3); 126 127 if(thread_state == EXITING_THREAD) 128 { 129 /* the child thread does not block, check the time expired or not */ 130 if(expired != 1) 131 { 132 printf("Test FAILED: abs_timeout should expire\n"); 133 exit(PTS_FAIL); 134 } 135 else 136 printf("thread correctly expired and did not wait\n"); 137 } 138 else if(thread_state == ENTERED_THREAD) 139 { 140 printf("Test FAILED: thread blocked even when the timer expired\n"); 141 exit(PTS_FAIL); 142 } 143 else 144 { 145 printf("Unexpected thread state %d\n", thread_state); 146 exit(PTS_UNRESOLVED); 147 } 148 149 printf("main: unlock write lock\n"); 150 if(pthread_rwlock_unlock(&rwlock) != 0) 151 { 152 printf("main: Error at pthread_rwlock_unlock()\n"); 153 return PTS_UNRESOLVED; 154 } 155 156 if(pthread_join(thread1, NULL) != 0) 157 { 158 printf("main: Error at pthread_join()\n"); 159 return PTS_UNRESOLVED; 160 } 161 162 if(pthread_rwlock_destroy(&rwlock) != 0) 163 { 164 printf("main: Error at pthread_rwlockattr_destroy()\n"); 165 return PTS_UNRESOLVED; 166 } 167 168 printf("Test PASSED\n"); 169 return PTS_PASS; 170} 171