| /* |
| * 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. |
| * |
| * Test that after returning from a signal handler, the reader will continue |
| * to wait with timedrdlock as long as the specified 'timeout' does not expire (the |
| * time spent in signal handler is longer than the specifed 'timeout'). |
| * |
| * Steps: |
| * 1. main thread create and write lock 'rwlock' |
| * 2. main thread create a thread sig_thread, the thread is set to handle SIGUSR1 |
| * 3. sig_thread timed read-lock 'rwlock' for reading, it should block |
| * 4. While the sig_thread is waiting (not expired yet), main thread sends SIGUSR1 |
| * to sig_thread via pthread_kill |
| * 5. Check that when thread handler returns, sig_thread resume block |
| * 7. When the wait is terminated, check that the thread wait for a proper period before |
| * expiring. |
| * |
| */ |
| |
| #define _XOPEN_SOURCE 600 |
| #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" |
| |
| static pthread_t sig_thread; |
| static pthread_rwlock_t rwlock; |
| |
| static int thread_state; |
| static int handler_called; |
| static struct timeval before_wait, after_wait; |
| |
| /* 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 5 |
| |
| /* Signal handler called by the thread when SIGUSR1 is received */ |
| static void sig_handler() { |
| |
| if (pthread_equal(pthread_self(), sig_thread)) |
| { |
| printf("sig_handler: signal is handled by sig_thread\n"); |
| handler_called = 1; |
| |
| } |
| else |
| { |
| printf("sig_handler: signal is not handled by sig_thread\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| } |
| |
| static void * th_fn(void *arg) |
| { |
| struct sigaction act; |
| struct timespec abs_timeout; |
| int rc = 0; |
| |
| handler_called = 0; |
| |
| /* Set up signal 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; |
| abs_timeout.tv_nsec = before_wait.tv_usec * 1000; |
| abs_timeout.tv_sec += TIMEOUT; |
| |
| printf("thread: attempt timed read lock, %d seconds\n", TIMEOUT); |
| thread_state = ENTERED_THREAD; |
| rc = pthread_rwlock_timedrdlock(&rwlock, &abs_timeout); |
| if (rc != ETIMEDOUT) |
| { |
| printf("sig_thread: pthread_rwlock_timedlock returns %d\n", rc); |
| exit(PTS_FAIL); |
| } |
| printf("thread: timer correctly expired\n"); |
| gettimeofday(&after_wait, NULL); |
| |
| thread_state = EXITING_THREAD; |
| pthread_exit(0); |
| return NULL; |
| } |
| |
| int main() |
| { |
| int cnt; |
| struct timeval wait_time; |
| |
| 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("main: Error at 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 (the thread should |
| * be block on rwlock since main() has the write lock at this point) */ |
| cnt = 0; |
| do{ |
| sleep(1); |
| }while (thread_state != ENTERED_THREAD && cnt++ < TIMEOUT); |
| |
| if (thread_state != ENTERED_THREAD) |
| { |
| printf("Unexpected thread state %d\n", thread_state); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| printf("main: fire SIGUSR1 to thread\n"); |
| if (pthread_kill(sig_thread, SIGUSR1) != 0) |
| { |
| printf("main: Error at pthread_kill()\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| /* wait at most 2*TIMEOUT seconds */ |
| cnt = 0; |
| do{ |
| sleep(1); |
| }while (thread_state != EXITING_THREAD && cnt++ < 2*TIMEOUT); |
| |
| if (cnt >= 2*TIMEOUT) |
| { |
| /* thread blocked*/ |
| printf("Test FAILED: thread blocked even afer the abs_timeout expired\n"); |
| exit(PTS_FAIL); |
| } |
| |
| if (handler_called != 1) |
| { |
| printf("The handler for SIGUSR1 did not get called\n"); |
| exit(PTS_UNRESOLVED); |
| } |
| |
| /* Test that the thread block for the correct TIMOUT time */ |
| wait_time.tv_sec = after_wait.tv_sec - before_wait.tv_sec; |
| wait_time.tv_usec = after_wait.tv_usec - before_wait.tv_usec; |
| if (wait_time.tv_usec < 0) |
| { |
| --wait_time.tv_sec; |
| wait_time.tv_usec += 1000000; |
| } |
| if (wait_time.tv_sec < TIMEOUT) |
| { |
| printf("Test FAILED: Timeout was for %d seconds, but waited for %ld.%06ld seconds instead\n", |
| TIMEOUT, (long int)wait_time.tv_sec, (long int)wait_time.tv_usec); |
| exit(PTS_FAIL); |
| } |
| |
| 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(sig_thread, NULL) != 0) |
| { |
| printf("main: Error at pthread_join()\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (pthread_rwlock_destroy(&rwlock) != 0) |
| { |
| printf("Error at pthread_destroy()\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| printf("Test PASSED\n"); |
| return PTS_PASS; |
| } |