3-2.c revision df3eb16e38c6a163b0a7367c885679eed6140964
1/* 2 * Copyright (c) 2002, Intel Corporation. All rights reserved. 3 * Created by: bing.wei.liu REMOVE-THIS AT intel DOT com 4 * This file is licensed under the GPL license. For the full content 5 * of this license, see the COPYING file at the top level of this 6 * source tree. 7 8 * Test pthread_mutexattr_settype() 9 * 10 * PTHREAD_MUTEX_ERRORCHECK 11 12 * Provides errorchecking. A thread attempting to relock this mutex without unlocking it 13 * first will return with an error. A thread attempting to unlock a mutex which another 14 * thread has locked will return with an error. A thread attempting to unlock an unlocked 15 * mutex will return with an error. 16 * 17 * Steps: 18 * 1. Initialize a pthread_mutexattr_t object with pthread_mutexattr_init() 19 * 2 Set the 'type' of the mutexattr object to PTHREAD_MUTEX_ERRORCHECK. 20 * 3. Create a mutex with that mutexattr object. 21 * 4. Lock the mutex. 22 * 5. Create a thread, and in that thread, attempt to unlock the mutex. It should return an 23 * error. 24 * 25 */ 26 27#define _XOPEN_SOURCE 600 28 29#include <pthread.h> 30#include <stdio.h> 31#include <errno.h> 32#include "posixtest.h" 33 34pthread_t thread1; 35pthread_mutex_t mutex; 36pthread_mutexattr_t mta; 37 38int ret; /* Return value of the thread unlocking the mutex. */ 39 40void *a_thread_func() 41{ 42 /* Try to unlock the mutex that main already locked. */ 43 ret=pthread_mutex_unlock(&mutex); 44 pthread_exit((void*)0); 45} 46 47 48int main() 49{ 50 51 /* Initialize a mutex attributes object */ 52 if (pthread_mutexattr_init(&mta) != 0) 53 { 54 perror("Error at pthread_mutexattr_init()\n"); 55 return PTS_UNRESOLVED; 56 } 57 58 /* Set the 'type' attribute to be PTHREAD_MUTEX_ERRORCHECK */ 59 if (pthread_mutexattr_settype(&mta, PTHREAD_MUTEX_ERRORCHECK) != 0) 60 { 61 printf("Test FAILED: Error setting the attribute 'type'\n"); 62 return PTS_FAIL; 63 } 64 65 /* Initialize the mutex with that attribute obj. */ 66 if (pthread_mutex_init(&mutex, &mta) != 0) 67 { 68 perror("Error intializing the mutex.\n"); 69 return PTS_UNRESOLVED; 70 } 71 72 /* Lock the mutex. */ 73 if (pthread_mutex_lock(&mutex) != 0 ) 74 { 75 perror("Error locking the mutex first time around.\n"); 76 return PTS_UNRESOLVED; 77 } 78 79 /* Create the thread that will try to unlock the mutex we just locked. */ 80 if (pthread_create(&thread1, NULL, a_thread_func, NULL) != 0) 81 { 82 perror("Error creating a thread.\n"); 83 return PTS_UNRESOLVED; 84 } 85 86 /* Wait for that thread to end execution */ 87 pthread_join(thread1, NULL); 88 89 if (ret == 0) 90 { 91 printf("Test FAILED: Expected an error when trying to unlock a mutex that was locked by another thread. Returned 0 instead.\n"); 92 return PTS_FAIL; 93 } 94 95 /* cleanup */ 96 pthread_mutex_unlock(&mutex); 97 pthread_mutex_destroy(&mutex); 98 99 if (pthread_mutexattr_destroy(&mta)) 100 { 101 perror("Error at pthread_mutexattr_destory().\n"); 102 return PTS_UNRESOLVED; 103 } 104 105 printf("Test PASSED\n"); 106 return PTS_PASS; 107} 108