testcases/open_posix_testsuite/conformance/interfaces/pthread_cond_signal/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_signal()
 *   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().
 */

#define _XOPEN_SOURCE 600

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

#define THREAD_NUM  3

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

pthread_t  thread[THREAD_NUM];

int start_num = 0;
int waken_num = 0;

/* Alarm handler */
void alarm_handler(int signo)
{
	int i;
	printf("Error: failed to wakeup all threads\n");
	for (i=0; i<THREAD_NUM; i++) {	/* cancel threads */
	    	pthread_cancel(thread[i]);
	}

	exit(PTS_UNRESOLVED);
}
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 be able to lock the recursive 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);
	}
	if (pthread_mutex_unlock(&td.mutex) != 0) {
		fprintf(stderr,"[Thread 0x%p] did not owned the mutex after the cond wait\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()
{
	int i;
	struct sigaction act;
	pthread_mutexattr_t ma;

	if (pthread_mutexattr_init(&ma) != 0) {
		fprintf(stderr,"Fail to initialize mutex attribute\n");
		return PTS_UNRESOLVED;
	}
	if (pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_RECURSIVE) != 0) {
		fprintf(stderr,"Fail to set the mutex attribute\n");
		return PTS_UNRESOLVED;
	}

	if (pthread_mutex_init(&td.mutex, &ma) != 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)	/* waiting for all threads started */
		usleep(100);

	sleep(1);

	/* Setup alarm handler */
	act.sa_handler=alarm_handler;
	act.sa_flags=0;
	sigemptyset(&act.sa_mask);
	sigaction(SIGALRM, &act, 0);
	alarm(5);

	while (waken_num < THREAD_NUM) { /* waiting for all threads wakened */
		fprintf(stderr,"[Main thread] signals a condition\n");
		if (pthread_cond_signal(&td.cond) != 0) {
			fprintf(stderr,"Main failed to signal the condition\n");
			return PTS_UNRESOLVED;
		}
		usleep(100);
	}

	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;
}