testcases/open_posix_testsuite/conformance/interfaces/pthread_cond_timedwait/2-1.c

/*
 * Copyright (c) 2002, Intel Corporation. All rights reserved.
 * Created by:  bing.wei.liu REMOVE-THIS AT intel DOT com
 * 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_cond_timedwait()
 *   shall be equivalent to pthread_cond_wait(), except that an error is returned
 *   if the absolute time specified by abstime passes before the condition cond is
 *   signaled or broadcasted, or if the absolute time specified by abstime has
 *   already been passed at the time of the call.
 *
 * Case 2-1
 *   Upon successful return, the mutex shall have been locked and shall
 *   be owned by the calling thread.
 */


#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <errno.h>
#include "posixtest.h"

#define INTERVAL  1
#define TIMEOUT   5

struct testdata {
	pthread_mutex_t mutex;
	pthread_cond_t cond;
} td;

int t1_start = 0;
int signaled = 0;

void *t1_func(void *arg)
{
	int rc;
	struct timespec timeout;
	struct timeval curtime;

	(void) arg;

	if (pthread_mutex_lock(&td.mutex) != 0) {
		fprintf(stderr, "Thread1 failed to acquire the mutex\n");
		exit(PTS_UNRESOLVED);
	}
	fprintf(stderr, "Thread1 started\n");
	t1_start = 1;		/* let main thread continue */

	if (gettimeofday(&curtime, NULL) != 0) {
		fprintf(stderr, "Fail to get current time\n");
		exit(PTS_UNRESOLVED);
	}
	timeout.tv_sec = curtime.tv_sec + TIMEOUT;
	timeout.tv_nsec = curtime.tv_usec * 1000;

	fprintf(stderr, "Thread1 is waiting for the cond\n");
	rc = pthread_cond_timedwait(&td.cond, &td.mutex, &timeout);
	if (rc != 0) {
		if (rc == ETIMEDOUT) {
			fprintf(stderr,
				"Thread1 stops waiting when time is out\n");
			exit(PTS_UNRESOLVED);
		} else {
			fprintf(stderr, "pthread_cond_timedwait return %d\n",
				rc);
			exit(PTS_UNRESOLVED);
		}
	}

	fprintf(stderr, "Thread1 wakened\n");
	if (signaled == 0) {
		fprintf(stderr, "Thread1 did not block on the cond at all\n");
		exit(PTS_UNRESOLVED);
	}

	if (pthread_mutex_trylock(&td.mutex) == 0) {
		fprintf(stderr,
			"Thread1 should not be able to lock the mutex again\n");
		printf("Test FAILED\n");
		exit(PTS_FAIL);
	}
	fprintf(stderr, "Thread1 failed to trylock the mutex (as expected)\n");

	if (pthread_mutex_unlock(&td.mutex) != 0) {
		fprintf(stderr, "Thread1 failed to release the mutex\n");
		printf("Test FAILED\n");
		exit(PTS_FAIL);
	}
	fprintf(stderr, "Thread1 released the mutex\n");
	return NULL;
}

int main(void)
{
	pthread_t thread1;

	if (pthread_mutex_init(&td.mutex, NULL) != 0) {
		fprintf(stderr, "Fail to initialize mutex\n");
		return PTS_UNRESOLVED;
	}
	if (pthread_cond_init(&td.cond, NULL) != 0) {
		fprintf(stderr, "Fail to initialize cond\n");
		return PTS_UNRESOLVED;
	}

	if (pthread_create(&thread1, NULL, t1_func, NULL) != 0) {
		fprintf(stderr, "Fail to create thread 1\n");
		return PTS_UNRESOLVED;
	}
	while (!t1_start)	/* wait for thread1 started */
		usleep(100);

	/* acquire the mutex released by pthread_cond_wait() within thread 1 */
	if (pthread_mutex_lock(&td.mutex) != 0) {
		fprintf(stderr, "Main failed to acquire mutex\n");
		return PTS_UNRESOLVED;
	}
	if (pthread_mutex_unlock(&td.mutex) != 0) {
		fprintf(stderr, "Main failed to release mutex\n");
		return PTS_UNRESOLVED;
	}
	sleep(INTERVAL);

	fprintf(stderr, "Time to wake up thread1 by signaling a condition\n");
	signaled = 1;
	if (pthread_cond_signal(&td.cond) != 0) {
		fprintf(stderr, "Main failed to signal the condition\n");
		return PTS_UNRESOLVED;
	}

	pthread_join(thread1, NULL);
	printf("Test PASSED\n");
	return PTS_PASS;
}