testcases/open_posix_testsuite/conformance/interfaces/pthread_cond_broadcast/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_broadcast()
 *   When each thread unblocked as a result of pthread_cond_signal()
 *   returns from its call to pthread_cond_wait(), the thread shall
 *   own the mutex with which it called pthread_cond_wait().
 */


#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include "posixtest.h"

#define THREAD_NUM  3

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

static int start_num;
static int waken_num;

static void *thr_func(void *arg)
{
	int rc;
	pthread_t self = pthread_self();

	if (pthread_mutex_lock(&td.mutex) != 0) {
		fprintf(stderr, "[Thread 0x%p] failed to acquire the mutex\n",
			(void *)self);
		exit(PTS_UNRESOLVED);
	}
	fprintf(stderr, "[Thread 0x%p] started and locked the mutex\n",
		(void *)self);
	start_num++;

	fprintf(stderr, "[Thread 0x%p] is waiting for the cond\n",
		(void *)self);
	rc = pthread_cond_wait(&td.cond, &td.mutex);
	if (rc != 0) {
		fprintf(stderr, "pthread_cond_wait return %d\n", rc);
		exit(PTS_UNRESOLVED);
	}

	if (pthread_mutex_trylock(&td.mutex) == 0) {
		fprintf(stderr, "[Thread 0x%p] should not be able to lock the "
			"mutex again\n", (void *)self);
		printf("Test FAILED\n");
		exit(PTS_FAIL);
	}
	fprintf(stderr, "[Thread 0x%p] was wakened and acquired the "
		"mutex again\n", (void *)self);
	waken_num++;

	if (pthread_mutex_unlock(&td.mutex) != 0) {
		fprintf(stderr, "[Thread 0x%p] failed to release the "
			"mutex\n", (void *)self);
		printf("Test FAILED\n");
		exit(PTS_FAIL);
	}
	fprintf(stderr, "[Thread 0x%p] released the mutex\n", (void *)self);
	return NULL;
}

int main(void)
{
	int i, rc;
	pthread_t thread[THREAD_NUM];

	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;
	}

	for (i = 0; i < THREAD_NUM; i++) {
		if (pthread_create(&thread[i], NULL, thr_func, NULL) != 0) {
			fprintf(stderr, "Fail to create thread[%d]\n", i);
			return PTS_UNRESOLVED;
		}
	}
	while (start_num < THREAD_NUM)
		usleep(100);

	/* Acquire the mutex to make sure that all waiters are currently
	   blocked on pthread_cond_wait */
	if (pthread_mutex_lock(&td.mutex) != 0) {
		fprintf(stderr, "Main: Fail to acquire mutex\n");
		return PTS_UNRESOLVED;
	}
	if (pthread_mutex_unlock(&td.mutex) != 0) {
		fprintf(stderr, "Main: Fail to release mutex\n");
		return PTS_UNRESOLVED;
	}

	/* broadcast the condition to wake up all waiters */
	fprintf(stderr, "[Main thread] broadcast the condition\n");
	rc = pthread_cond_broadcast(&td.cond);
	if (rc != 0) {
		fprintf(stderr, "[Main thread] failed to broadcast the "
			"condition\n");
		return PTS_UNRESOLVED;
	}
	sleep(1);
	if (waken_num < THREAD_NUM) {
		fprintf(stderr, "[Main thread] Not all waiters were wakened\n");
		for (i = 0; i < THREAD_NUM; i++)
			pthread_cancel(thread[i]);

		return PTS_UNRESOLVED;
	}
	fprintf(stderr, "[Main thread] all waiters were wakened\n");

	/* join all secondary threads */
	for (i = 0; i < THREAD_NUM; i++) {
		if (pthread_join(thread[i], NULL) != 0) {
			fprintf(stderr, "Fail to join thread[%d]\n", i);
			return PTS_UNRESOLVED;
		}
	}
	printf("Test PASSED\n");
	return PTS_PASS;
}