| /* |
| * 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 pthread_rwlock_timedrdlock(pthread_rwlock_t * rwlock) |
| * |
| * If a signal that causes a signal handler to be executed is delivered to |
| * a thread blocked on a read-write lock via a call to pthread_rwlock_timedrdlock(), |
| * upon return from the signal handler the thread shall resume waiting for the lock |
| * as if it was not interrupted. |
| * |
| * Steps: |
| * 1. main thread create read-write lock 'rwlock', and lock it for writing |
| * 2. main thread create a thread sig_thread, the thread is set to handle SIGUSR1 |
| * 3. sig_thread timed lock 'rwlock' for reading, but blocked |
| * 4. While the sig_thread is waiting(not expried yet), main thread send SIGUSR1 |
| * to sig_thread via pthread_kill |
| * 5. test that thread handler is called, inside the handler, make the thread sleep |
| * for a period that the specified 'timeout' for pthread_rwlock_timedrdlock() |
| * should have expired (timeout * 2) |
| * 6. While sig_thread sleeping in signal handler, main thread unlock 'rwlock' |
| * 7. check that when thread handler returns, sig_thread get the read lock without |
| * getting ETIMEDOUT. |
| */ |
| |
| #include <pthread.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <signal.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <time.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 2 |
| |
| static pthread_t sig_thread; |
| static pthread_rwlock_t rwlock; |
| |
| static int thread_state; |
| static int handler_state; |
| static int expired; |
| static struct timeval before_wait, after_wait; |
| |
| static void sig_handler() |
| { |
| |
| struct timespec sleep_time_req; |
| |
| sleep_time_req.tv_sec = TIMEOUT * 2; |
| sleep_time_req.tv_nsec = 0; |
| |
| if (pthread_equal(pthread_self(), sig_thread)) { |
| printf("sig_handler: signal is handled by thread\n"); |
| /* sig_handler will not sleep 2 times more than the timeout for the |
| * pthread_rwlock_timerdlock is waiting for */ |
| printf("sig_handler: sleeping for %d seconds\n", |
| (int)sleep_time_req.tv_sec); |
| handler_state = 2; |
| sleep((int)sleep_time_req.tv_sec); |
| } else { |
| printf("sig_handler: signal is not handled by thread\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| handler_state = 3; |
| } |
| |
| static void *th_fn(void *arg) |
| { |
| struct sigaction act; |
| struct timespec abs_timeout; |
| int rc; |
| handler_state = 2; |
| expired = 0; |
| |
| /* Set up handler for SIGUSR1 */ |
| |
| act.sa_flags = 0; |
| act.sa_handler = sig_handler; |
| /* block all the signal when hanlding SIGUSR1 */ |
| sigfillset(&act.sa_mask); |
| sigaction(SIGUSR1, &act, 0); |
| |
| gettimeofday(&before_wait, NULL); |
| abs_timeout.tv_sec = before_wait.tv_sec + TIMEOUT; |
| abs_timeout.tv_nsec = before_wait.tv_usec * 1000; |
| |
| thread_state = ENTERED_THREAD; |
| |
| printf("thread: attempt timed read lock, %d seconds\n", TIMEOUT); |
| rc = pthread_rwlock_timedrdlock(&rwlock, &abs_timeout); |
| if (rc == 0) { |
| printf("thread: correctly acquired read lock\n"); |
| expired = 0; |
| } else if (rc == ETIMEDOUT) { |
| printf("thread: timer expired, did not acquire read lock"); |
| expired = 1; |
| } else { |
| printf("Error at pthread_rwlock_timedrdlock()"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| gettimeofday(&after_wait, NULL); |
| |
| thread_state = EXITING_THREAD; |
| pthread_exit(0); |
| return NULL; |
| } |
| |
| int main(void) |
| { |
| int cnt; |
| |
| 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("pthread_rwlock_wrlock()\n"); |
| return PTS_UNRESOLVED; |
| } |
| printf("main: acquired write lock\n"); |
| |
| thread_state = NOT_CREATED_THREAD; |
| if (pthread_create(&sig_thread, NULL, th_fn, NULL) != 0) { |
| printf("Error at pthread_create()\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| /* wait for the thread to get ready for handling signal */ |
| cnt = 0; |
| do { |
| sleep(1); |
| } while (thread_state != ENTERED_THREAD && cnt++ < TIMEOUT); |
| |
| if (thread_state != ENTERED_THREAD) { |
| printf("Error: thread did not block when getting read lock\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| printf("main: fire SIGUSR1 to thread\n"); |
| if (pthread_kill(sig_thread, SIGUSR1) != 0) { |
| printf("Error in pthread_kill()"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| /* Wait for signal handler to sleep so that main can unlock the rwlock while |
| * it is sleeping. (this way, the rwlock will be unlocked when the signal handler |
| * returns, and control is given back to the thread) */ |
| |
| cnt = 0; |
| do { |
| sleep(TIMEOUT); |
| } while (handler_state != 2 && cnt++ < 2); |
| |
| if (handler_state == 1) { |
| printf("Error: signal handler did not get called\n"); |
| exit(PTS_UNRESOLVED); |
| } else if (handler_state == 3) { |
| printf("Error: signal handler incorrectly exited\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| if (expired == 1) { |
| printf("Error: thread timeout in sig_handler\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| printf("main: unlock write lock\n"); |
| if (pthread_rwlock_unlock(&rwlock) != 0) { |
| printf("Error at pthread_rwlock_unlock()\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| /* wait at most 4*TIMEOUT seconds for thread to exit */ |
| cnt = 0; |
| do { |
| sleep(1); |
| } while (thread_state != EXITING_THREAD && cnt++ < 4 * TIMEOUT); |
| |
| if (cnt >= 4 * TIMEOUT) { |
| /* thread blocked */ |
| printf |
| ("Test FAILED: thread blocked even afer the abs_timeout expires\n"); |
| exit(PTS_FAIL); |
| } |
| |
| if (expired == 1) { |
| printf("Test FAILED: thread should get the read lock\n"); |
| exit(PTS_FAIL); |
| } |
| |
| if (pthread_join(sig_thread, NULL) != 0) { |
| printf("Error at pthread_join()"); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (pthread_rwlock_destroy(&rwlock) != 0) { |
| printf("Error at pthread_destroy()"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| printf("Test PASSED\n"); |
| return PTS_PASS; |
| } |