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/*-

 * Copyright (c) 2005, Kohsuke Ohtani

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the author nor the names of any co-contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

/*

 * sem.c - test program for semaphore.

 */

#include <sys/prex.h>

#include <stdio.h>

int

main(int argc, char *argv[])

{

        sem_t sem;

        int error;

        u_int val;

        printf("Semaphore test program\n");

        /*

         * Test initialize

         */

        sem_init(&sem, 3);

        /*

         * Test wait

         */

        error = sem_getvalue(&sem, &val);

        printf("Semaphore value=%d\n", val);

        printf("1) Wait semahore\n");

        error = sem_wait(&sem, 0);

        if (error)

                panic("wait error");

        error = sem_getvalue(&sem, &val);

        printf("Semaphore value=%d\n", val);

        printf("2) Wait semahore\n");

        error = sem_wait(&sem, 0);

        if (error)

                panic("wait error");

        error = sem_getvalue(&sem, &val);

        printf("Semaphore value=%d\n", val);

        printf("3) Wait semahore\n");

        error = sem_wait(&sem, 0);

        if (error)

                panic("wait error");

        error = sem_getvalue(&sem, &val);

        printf("Semaphore value=%d\n", val);

#if 0

        /*

         * Sleep by wait

         */

        printf("4) Wait semahore\n");

        error = sem_wait(&sem, 0);

        if (error)

                panic("wait error");

#endif

        /*

         * trywait must be error.

         */

        printf("4e) Try to wait semahore\n");

        error = sem_trywait(&sem);

        printf("Try wait error=%d\n", error);

        /*

         * Test post

         */

        printf("5) Post semahore\n");

        error = sem_post(&sem);

        if (error)

                panic("post error");

        error = sem_getvalue(&sem, &val);

        printf("Semaphore value=%d\n", val);

        printf("Test complete\n");

        return 0;

}