| /* |
| * Copyright (c) 2002, Intel Corporation. All rights reserved. |
| * This file is licensed under the GPL license. For the full content |
| * of this license, see the COPYING file at the top level of this |
| * source tree. |
| |
| * Test that pthread_rwlock_timedrdlock(pthread_rwlock_t *rwlock) |
| * |
| * The timeout shall expire when the absolute time specified by abs_timeout passes, |
| * as measured by the clock on which timeouts are based (that is, when the |
| * value of that clock equals or exceeds abs_timeout), or if the absolute time |
| * specified by abs_timeout has already been passed at the time of the call. |
| * |
| * Steps: |
| * 1. Initialize a pthread_rwlock_t object 'rwlock' with pthread_rwlock_init() |
| * 2. Main thread lock 'rwlock' for writing with pthread_rwlock_rdlock() |
| * 3. Create a child thread, specify a 'abs_timeout' as being the current time _minus_ |
| * a timeout value of 1. (this ensures that the abs_timeout has already passed) |
| * 4. The thread lock 'rwlock' for reading, using pthread_rwlock_timedrdlock(). Should |
| * get an ETIMEOUT error. |
| */ |
| |
| #define _XOPEN_SOURCE 600 |
| |
| #include <pthread.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include "posixtest.h" |
| |
| /* thread_state indicates child thread state: |
| 1: not in child thread yet; |
| 2: just enter child thread ; |
| 3: just before child thread exit; |
| */ |
| |
| #define NOT_CREATED_THREAD 1 |
| #define ENTERED_THREAD 2 |
| #define EXITING_THREAD 3 |
| |
| #define TIMEOUT 1 |
| |
| static pthread_rwlock_t rwlock; |
| static int thread_state; |
| static int currsec1, currsec2; |
| static int expired; |
| |
| static void* fn_rd(void *arg) |
| { |
| struct timespec abs_timeout; |
| int rc; |
| thread_state = ENTERED_THREAD; |
| |
| currsec1 = time(NULL); |
| |
| /* Absolute time, not relative. */ |
| abs_timeout.tv_sec = currsec1 - TIMEOUT; |
| abs_timeout.tv_nsec = 0; |
| |
| printf("thread: attempt timed read-lock\n"); |
| rc = pthread_rwlock_timedrdlock(&rwlock, &abs_timeout); |
| if (rc == ETIMEDOUT) |
| { |
| printf("thread: timed read-lock correctly expired\n"); |
| expired = 1; |
| } |
| else if (rc == 0) |
| { |
| printf("thread: acquired read-lock\n"); |
| expired = 0; |
| printf("thread: unlock read lock\n"); |
| if (pthread_rwlock_unlock(&rwlock) != 0) |
| { |
| printf("thread: failed to release lock\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| } |
| else |
| { |
| printf("Error in pthread_rwlock_timedrdlock(), error code:%d.\n", rc); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| /* Get time after the mutex timed out in locking. */ |
| currsec2 = time(NULL); |
| thread_state = EXITING_THREAD; |
| pthread_exit(0); |
| return NULL; |
| } |
| |
| int main() |
| { |
| int cnt = 0; |
| pthread_t thread1; |
| |
| expired = 0; |
| |
| if (pthread_rwlock_init(&rwlock, NULL) != 0) |
| { |
| printf("Error at pthread_rwlock_init()\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| printf("main: attempt write lock\n"); |
| if (pthread_rwlock_wrlock(&rwlock) != 0) |
| { |
| printf("Error at pthread_rwlock_wrlock()\n"); |
| return PTS_UNRESOLVED; |
| } |
| printf("main: acquired write lock\n"); |
| |
| printf("main: create thread\n"); |
| thread_state = NOT_CREATED_THREAD; |
| if (pthread_create(&thread1, NULL, fn_rd, NULL) != 0) |
| { |
| printf("Error creating thread1\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| /* If the shared data is not altered by child after 5 seconds, |
| we regard it as blocked */ |
| |
| /* We expect the thread _NOT_ to block, and instead time out */ |
| cnt = 0; |
| do{ |
| sleep(1); |
| }while (thread_state !=EXITING_THREAD && cnt++ < 5); |
| |
| if (thread_state == EXITING_THREAD) |
| { |
| /* the child thread does not block, check the time expired or not */ |
| if (expired != 1) |
| { |
| printf("Test FAILED: abs_timeout should expire\n"); |
| exit(PTS_FAIL); |
| } |
| } |
| else if (thread_state == ENTERED_THREAD) |
| { |
| printf("Test FAILED: thread blocked even when the timer expired\n"); |
| exit(PTS_FAIL); |
| } |
| else |
| { |
| printf("Unexpected thread state %d\n", thread_state); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| printf("main: unlock write lock\n"); |
| if (pthread_rwlock_unlock(&rwlock) != 0) |
| { |
| printf("main: Error at pthread_rwlock_unlock()\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (pthread_join(thread1, NULL) != 0) |
| { |
| printf("main: Error at pthread_join()\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (pthread_rwlock_destroy(&rwlock) != 0) |
| { |
| printf("main: Error at pthread_rwlock_destroy()\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| printf("Test PASSED\n"); |
| return PTS_PASS; |
| } |