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 pthread_rwlock_wrlock(pthread_rwlock_t *rwlock) 8 * 9 * It may fail if: 10 * [EDEADLK] The current thread already owns the rwlock for writing or reading. 11 * 12 * Steps: 13 * 1. Create and initialize an rwlock 14 * 2. Perform a write lock via pthread_rwlock_wrlock() 15 * 3. Perform a write lock _again_ with pthread_rwlock_wrlock without first unlocking rwlock() 16 * 4. Test if returns EDEADLK or not. Note the standard states "may" fail, so the test always 17 * passes even if 0 is returned. 18 * 19 */ 20 #include <pthread.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <unistd.h> 24 #include <errno.h> 25 #include "posixtest.h" 26 27 int main(void) 28 { 29 static pthread_rwlock_t rwlock; 30 int rc; 31 32 if (pthread_rwlock_init(&rwlock, NULL) != 0) { 33 printf("Error at pthread_rwlock_init()\n"); 34 return PTS_UNRESOLVED; 35 } 36 37 /* Attempt to write lock rwlock, it should return successfully */ 38 39 printf("main: attempt write lock\n"); 40 if (pthread_rwlock_wrlock(&rwlock) != 0) { 41 printf("Error at pthread_rwlock_wrlock()\n"); 42 return PTS_UNRESOLVED; 43 } 44 printf("main: acquired write lock\n"); 45 46 /* Now attempt to write lock again without first unlocking rwlock. It may return 47 * EDEADLK, but it may also return successfully. */ 48 49 printf("main: attempt write lock\n"); 50 rc = pthread_rwlock_wrlock(&rwlock); 51 52 /* Clean up before we test the return value of pthread_rwlock_wrlock() */ 53 if (pthread_rwlock_unlock(&rwlock) != 0) { 54 printf("Error releasing write lock\n"); 55 exit(PTS_UNRESOLVED); 56 } 57 58 if (pthread_rwlock_destroy(&rwlock) != 0) { 59 printf("Error at pthread_rwlock_destroy()\n"); 60 return PTS_UNRESOLVED; 61 } 62 63 if (rc != 0) { 64 if (rc == EDEADLK) { 65 printf("main: correctly got EDEADLK\n"); 66 printf("Test PASSED\n"); 67 return PTS_PASS; 68 } else { 69 printf("Test FAILED: Incorrect return code %d\n", rc); 70 return PTS_FAIL; 71 } 72 } 73 74 printf("main: acquired write lock\n"); 75 printf("main: unlock write lock\n"); 76 77 printf 78 ("Test PASSED: Note*: Returned 0 instead of EDEADLK, but standard specified _may_ fail.\n"); 79 return PTS_PASS; 80 } 81
