testcases/open_posix_testsuite/conformance/interfaces/sem_getvalue/2-2.c

/*
* Copyright (c) 2005, Bull S.A..  All rights reserved.
* Created by: Sebastien Decugis

* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.

* This sample test aims to check the following assertion:
*
*  If the semaphore is locked, the sval value is set to 0 or to a negative
* value representing the number of waiters for the semaphore.

* The steps are:
* -> init a semaphore (value = 0)
* -> create a thread which waits for the semaphore
* -> call sem_getvalue and check value of the semaphore
* -> sem_post and destroy everything

* The test fails if value is not as expected.

*/

/******************************************************************************/
/*************************** standard includes ********************************/
/******************************************************************************/
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <semaphore.h>
#include <errno.h>

/******************************************************************************/
/***************************   Test framework   *******************************/
/******************************************************************************/
#include "../testfrmw/testfrmw.h"
#include "../testfrmw/testfrmw.c"
/* This header is responsible for defining the following macros:
 * UNRESOLVED(ret, descr);
 *    where descr is a description of the error and ret is an int
 *   (error code for example)
 * FAILED(descr);
 *    where descr is a short text saying why the test has failed.
 * PASSED();
 *    No parameter.
 *
 * Both three macros shall terminate the calling process.
 * The testcase shall not terminate in any other maneer.
 *
 * The other file defines the functions
 * void output_init()
 * void output(char * string, ...)
 *
 * Those may be used to output information.
 */

/******************************************************************************/
/**************************** Configuration ***********************************/
/******************************************************************************/
#ifndef VERBOSE
#define VERBOSE 1
#endif

/******************************************************************************/
/***************************    Test case   ***********************************/
/******************************************************************************/

void *threaded(void * arg)
{
	int ret;

	do {
		ret = sem_wait(arg);
	} while ((ret != 0) && (errno == EINTR));

	if (ret != 0) {
		UNRESOLVED(errno, "Failed to wait for the semaphore");
	}

	return NULL;
}

/* The main test function. */
int main(int argc, char *argv[])
{
	int ret, val;
	sem_t sem;
	pthread_t th;

	/* Initialize output */
	output_init();

	/* Initialize semaphore */
	ret = sem_init(&sem, 0, 0);

	if (ret != 0) {
		UNRESOLVED(errno, "Failed to init semaphore");
	}

	/* Create the thread */
	ret = pthread_create(&th, NULL, threaded, &sem);

	if (ret != 0) {
		UNRESOLVED(ret, "Failed to create the thread");
	}

	/* Sleep 1 sec so the thread enters the sem_wait call */
	sleep(1);

	/* Check value */
	ret = sem_getvalue(&sem, &val);

	if (ret != 0) {
		UNRESOLVED(errno, "Failed to get semaphore value");
	}

	if ((val != 0) && (val != -1)) {
		output("Val: %d\n", val);
		FAILED("Semaphore count is neither 0 nor # of waiting processes");
	}

	/* Post the semaphore */
	ret = sem_post(&sem);

	if (ret != 0) {
		UNRESOLVED(errno, "Failed to post the semaphore");
	}

	/* Join the thread */
	ret = pthread_join(th, NULL);

	if (ret != 0) {
		UNRESOLVED(ret, "Failed to join the thread");
	}

	/* Destroy the semaphore */
	ret = sem_destroy(&sem);

	if (ret != 0) {
		UNRESOLVED(errno, "Failed to sem_destroy");
	}

	/* Test passed */
#if VERBOSE > 0

	output("Test passed\n");

#endif

	PASSED;
}