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semaphoretest.c

This example is console C program demonstrating the usage and testing the implementation of StmSemaphore (see Abstract Data Type StmSemaphore).

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the SysToMath C Libraries package (LibStmC).
 *
 * The Initial Developer of the Original Code is
 * Tom Michaelis, SysToMath.
 * Portions created by the Initial Developer are Copyright (C) 1994-2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/******************************************************************************
 *                       First Release 1994-07-20
 ******************************************************************************/


#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stm/system.h>

int main (int argc, char **argv)
{
    struct
    {
        StmSemaphore semaphore;
        char *msg;
    }
    data [] =
    {
        {
            NULL,
            "Ping"
        },
        {
            NULL,
            "Pong"
        }
    };
    int i, j, k;
    char suff [16];
    char name [32];
    if (argc == 1)
    {
        char *const childArgv [] = {argv [0], suff, NULL};
        sprintf (suff, "%d", getpid ());
        if (stmProcessSpawn (argv [0], childArgv, StmFalse) < 0)
        {
            printf ("%s: stmProcessSpawn failed: %s\n",
                    argv [0], strerror (errno));
            exit (1);
        }
        j = 0;
    }
    else
    {
        strcpy (suff, argv [1]);
        j = 1;
    }
    for (k = 0; k < 2; ++ k)
    {
        sprintf (name, "TestSemaphore%s%s", data [k].msg, suff);
        if (! (data [k].semaphore = stmSemaphoreCreate (name, 1 - k, StmAttach)))
        {
            printf ("Process %d: stmSemaphoreCreate for '%s' failed: %s\n",
                    getpid (), name, strerror (errno));
        }
    }
    for (i = 0; i < 10; ++ i)
    {
        if (stmSemaphoreTimedAcquire (data [j].semaphore, stmGetMsTime () + 500))
        {
            printf ("Process %d: stmSemaphoreAcquire for '%s' failed: %s\n",
                    getpid (), stmSemaphoreName (data [j].semaphore), strerror (errno));
            exit (1);
        }
        printf ("Process %d: %s\n", getpid (), data [j].msg);
        if (stmSemaphoreRelease (data [1 - j].semaphore))
        {
            printf ("Process %d: stmSemaphoreRelease for '%s' failed: %s\n",
                    getpid (), stmSemaphoreName (data [1 - j].semaphore), strerror (errno));
            exit (1);
        }
    }
    stmSemaphoreDestroy (data [0].semaphore);
    stmSemaphoreDestroy (data [1].semaphore);
    return 0;
}



© Copyright Tom Michaelis 2002-2007

Distributed under the SysToMath Software License (See the accompanying file license.txt or a copy at www.SysToMath.com).