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

/* ***** 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
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 * 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
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 * ***** END LICENSE BLOCK ***** */

 *                       First Release 1994-07-20

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

static StmProcessSemaphore semaphore;

static int counter;

static void *handler (void *data)
    int i, id = * (int *) data;
    for (i = 0; i < 10; ++ i)
        stmProcessSemaphoreAcquire (semaphore);
        ++ counter;
        printf ("thread%d: Counter value: %d\n", id, counter);
        stmProcessSemaphoreRelease (semaphore);
    return NULL;

int main ()
    static int id [] = {1, 2};
    semaphore = stmProcessSemaphoreCreate (1);
        StmThread thread1 = stmThreadCreate (handler, id + 0);
        StmThread thread2 = stmThreadCreate (handler, id + 1);
        stmThreadJoin (thread1, NULL);
        stmThreadJoin (thread2, NULL);
        stmThreadDestroy (thread1);
        stmThreadDestroy (thread2);
    stmProcessSemaphoreDestroy (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).