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namedconditiontest.c

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

/* ***** 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)
{
    pid_t child = (pid_t) -1;
    StmNamedMutex requestMutex = stmNamedMutexCreate
    (
        argc == 1 ? "RequestMutex%p" : argv [1],
        StmFalse,
        StmAttach
    );
    StmNamedCondition requestCond = stmNamedConditionCreate
    (
        argc == 1 ? "RequestCondition%p" : argv [2]
    );
    StmNamedMutex responseMutex = stmNamedMutexCreate
    (
        argc == 1 ? "ResponseMutex%p" : argv [3],
        StmFalse,
        StmAttach
    );
    StmNamedCondition responseCond = stmNamedConditionCreate
    (
        argc == 1 ? "ResponseCondition%p" : argv [4]
    );
    if (argc == 1)
    {
        int counter = 0;
        char *const childArgv [] =
        {
            argv [0],
            (char *) stmNamedMutexName (requestMutex),
            (char *) stmNamedConditionName (requestCond),
            (char *) stmNamedMutexName (responseMutex),
            (char *) stmNamedConditionName (responseCond),
            NULL
        };
        if ((child = stmProcessSpawn (argv [0], childArgv, StmFalse)) < 0)
        {
            printf ("%s: stmProcessSpawn failed: %s\n",
                    argv [0], strerror (errno));
            exit (1);
        }
        stmNamedMutexLock (requestMutex);
        while (counter < 20)
        {
            switch
            (
                stmNamedConditionTimedWait
                (
                    requestCond,
                    requestMutex,
                    stmGetMsTime () + 10
                )
            )
            {
            case 0:
                stmNamedMutexLock (responseMutex);
                stmNamedConditionSignal (responseCond);
                printf ("Server %d: Got request %d from client\n",
                        getpid (), ++ counter);
                stmNamedMutexUnlock (responseMutex);
                break;
            case 1:
                break;
            default:
                counter = 20;
                printf ("Server %d: Waiting for request failed: %s: aborted\n",
                        getpid (), strerror (errno));
                break;
            }
        }
        stmNamedMutexUnlock (requestMutex);
        stmProcessWait (child, NULL);
    }
    else
    {
        int counter = 0;
        stmNamedMutexLock (responseMutex);
        while (counter < 20)
        {
            if
            (
                stmNamedMutexLock (requestMutex) ||
                stmNamedConditionSignal (requestCond) ||
                stmNamedMutexUnlock (requestMutex) ||
                stmNamedConditionTimedWait
                (
                    responseCond,
                    responseMutex,
                    stmGetMsTime () + 100
                )
            )
            {
                counter = 20;
                printf ("Client %d: Request for server failed: %s: aborted\n",
                        getpid (), strerror (errno));
            }
            else
            {
                printf ("Client %d: Got response %d from server\n",
                        getpid (), ++ counter);
            }
        }
        stmNamedMutexUnlock (responseMutex);
    }
    stmNamedConditionDestroy (responseCond);
    stmNamedMutexDestroy (responseMutex);
    stmNamedConditionDestroy (requestCond);
    stmNamedMutexDestroy (requestMutex);
    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).