| /* |
| * 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 function shall apply a read lock to the read-write lock referenced by |
| * rwlock as in the pthread_rwlock_rdlock(). However, if the lock cannot be |
| * acquired with out waiting for other threads to unlock the lock, this wait |
| * shall be terminated when the specified timeout expires. |
| * |
| * Steps: |
| * 1. Initialize a pthread_rwlock_t object 'rwlock' with pthread_rwlock_init() |
| * 2. Main thread lock 'rwlock' for reading with pthread_rwlock_rdlock() |
| * 3. Create a child thread, the thread lock 'rwlock' for reading, |
| * using pthread_rwlock_timedrdlock(), should get read lock. Thread unlocks 'rwlock'. |
| * 4. Main thread unlock 'rwlock' |
| * 5. Main thread lock 'rwlock' for writing |
| * 6. Create child thread to lock 'rwlock' for reading, |
| * using pthread_rwlock_timedrdlock, should block |
| * but when the timer expires, the wait will be terminated |
| * 7. Main thread unlock 'rwlock' |
| */ |
| |
| /* Test for CLOCK_REALTIME */ |
| |
| #define _XOPEN_SOURCE 600 |
| #include <pthread.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <sys/time.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 3 |
| |
| static pthread_rwlock_t rwlock; |
| static int thread_state; |
| static struct timeval currsec1, currsec2; |
| |
| static void *fn_rd(void *arg) |
| { |
| |
| thread_state = ENTERED_THREAD; |
| struct timespec timeout, ts; |
| int rc; |
| #ifdef CLOCK_REALTIME |
| printf("Test CLOCK_REALTIME\n"); |
| clock_gettime(CLOCK_REALTIME, &ts); |
| currsec1.tv_sec = ts.tv_sec; |
| currsec1.tv_usec = ts.tv_nsec / 1000; |
| #else |
| gettimeofday(&currsec1, NULL); |
| #endif |
| /* Absolute time, not relative. */ |
| timeout.tv_sec = currsec1.tv_sec + TIMEOUT; |
| timeout.tv_nsec = currsec1.tv_usec * 1000; |
| |
| printf("thread: attempt timed read lock, %d secs\n", TIMEOUT); |
| rc = pthread_rwlock_timedrdlock(&rwlock, &timeout); |
| if (rc == ETIMEDOUT) |
| printf("thread: timer expired\n"); |
| else if (rc == 0) { |
| printf("thread: acquired read lock\n"); |
| printf("thread: unlock read lock\n"); |
| if (pthread_rwlock_unlock(&rwlock) != 0) { |
| exit(PTS_UNRESOLVED); |
| } |
| } else { |
| printf |
| ("Error: thread: in pthread_rwlock_timedrdlock(), return code:%d\n", |
| rc); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| /* Get time after the pthread_rwlock_timedrdlock() call. */ |
| #ifdef CLOCK_REALTIME |
| clock_gettime(CLOCK_REALTIME, &ts); |
| currsec2.tv_sec = ts.tv_sec; |
| currsec2.tv_usec = ts.tv_nsec / 1000; |
| #else |
| gettimeofday(&currsec2, NULL); |
| #endif |
| thread_state = EXITING_THREAD; |
| pthread_exit(0); |
| return NULL; |
| } |
| |
| int main(void) |
| { |
| int cnt = 0; |
| pthread_t rd_thread1, rd_thread2; |
| |
| if (pthread_rwlock_init(&rwlock, NULL) != 0) { |
| printf("main: Error at pthread_rwlock_init()\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| printf("main: attempt read lock\n"); |
| if (pthread_rwlock_rdlock(&rwlock) != 0) { |
| printf("main: Error at pthread_rwlock_rdlock()\n"); |
| return PTS_UNRESOLVED; |
| } |
| printf("main: acquired read lock\n"); |
| |
| thread_state = NOT_CREATED_THREAD; |
| |
| printf("main: create rd_thread1\n"); |
| if (pthread_create(&rd_thread1, NULL, fn_rd, NULL) != 0) { |
| printf("main: Error when creating rd_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 */ |
| cnt = 0; |
| do { |
| sleep(1); |
| } while (thread_state != EXITING_THREAD && cnt++ < 5); |
| |
| if (thread_state == ENTERED_THREAD) { |
| /* the child thread started but blocked */ |
| printf |
| ("Test FAILED: rd_thread1 blocked on pthread_rwlock_timedrdlock()\n"); |
| exit(PTS_FAIL); |
| } else if (thread_state != EXITING_THREAD) { |
| printf("Unexpected thread state %d\n", thread_state); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| if (pthread_join(rd_thread1, NULL) != 0) { |
| printf("main: Error when join rd_thread1\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| printf("main: unlock read lock\n"); |
| if (pthread_rwlock_unlock(&rwlock) != 0) { |
| printf("main: Error when release read lock\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| printf("main: attempt write lock\n"); |
| if (pthread_rwlock_wrlock(&rwlock) != 0) { |
| printf("main: Failed to get write lock\n"); |
| return PTS_UNRESOLVED; |
| } |
| printf("main: acquired write lock\n"); |
| |
| thread_state = NOT_CREATED_THREAD; |
| printf("main: create rd_thread2\n"); |
| if (pthread_create(&rd_thread2, NULL, fn_rd, NULL) != 0) { |
| printf("main: Failed to create rd_thread2\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| /* we expect rd_thread2 to block and timeout. */ |
| 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 interval */ |
| struct timeval time_diff; |
| time_diff.tv_sec = currsec2.tv_sec - currsec1.tv_sec; |
| time_diff.tv_usec = currsec2.tv_usec - currsec1.tv_usec; |
| if (time_diff.tv_usec < 0) { |
| --time_diff.tv_sec; |
| time_diff.tv_usec += 1000000; |
| } |
| if (time_diff.tv_sec < TIMEOUT) { |
| printf |
| ("Test FAILED: the timer expired and thread terminated, " |
| "but the timeout is not correct: " |
| "start time %ld.%06ld, end time %ld.%06ld\n", |
| (long)currsec1.tv_sec, (long)currsec1.tv_usec, |
| (long)currsec2.tv_sec, (long)currsec2.tv_usec); |
| exit(PTS_FAIL); |
| } else |
| printf("thread: read lock correctly timed out\n"); |
| } else if (thread_state == ENTERED_THREAD) { |
| printf |
| ("Test FAILED: read block was not terminated even when the timer expired\n"); |
| exit(PTS_FAIL); |
| } else { |
| printf("Unexpected thread state %d\n", thread_state); |
| return PTS_UNRESOLVED; |
| } |
| |
| printf("main: unlock write lock\n"); |
| if (pthread_rwlock_unlock(&rwlock) != 0) { |
| printf("main: Failed to release write lock\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| if (pthread_rwlock_destroy(&rwlock) != 0) { |
| printf("Error at pthread_rwlockattr_destroy()\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| printf("Test PASSED\n"); |
| return PTS_PASS; |
| } |