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sharedmemorytest.c

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/* ***** 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>


StmAbstractType (SampleItemType)  /* SampleSharedMemory */


struct SampleItemTypeImpl_
{
    int counter;
    double value;
};

static int stmSampleItemTypeInit (SampleItemType item, void *data)
{
    item -> counter = 0;
    item -> value = * (double *) data;
    return 0;
}

static int stmSampleItemTypeDeinit (SampleItemType item)
{
    return 0;
}

StmSharedMemoryItemDefine (SampleItemType, 100)  /* SampleSharedMemory */


static StmSharedMemorySampleItemType shm;

int main (int argc, char **argv)
{
    pid_t child = (pid_t) -1;
    int i;
    double begval = 0.99;
    shm = stmSharedMemorySampleItemTypeCreate
    (
        argc == 1 ? "SampelItemTypeTestShm%p" : argv [1],
        StmAttach,
        &begval
    );
    if (!shm)
    {
        printf ("Process %d: stmSharedMemorySampleItemTypeCreate failed: %s\n",
                getpid (), strerror (errno));
        exit (1);
    }
    if (argc == 1)
    {
        char *const childArgv [] =
        {
            argv [0],
            (char *) stmSharedMemorySampleItemTypeName (shm),
            NULL
        };
        if ((child = stmProcessSpawn (argv [0], childArgv, StmFalse)) < 0)
        {
            printf ("%s: stmProcessSpawn failed: %s\n",
                    argv [0], strerror (errno));
            exit (1);
        }
    }
    for (i = 0; i < 10; ++ i)
    {
        SampleItemType item = stmSharedMemorySampleItemTypeLock (shm);
        if (!item)
        {
            printf ("Process %d: stmSharedMemorySampleItemTypeLock failed: %s\n",
                    getpid (), strerror (errno));
        }
        else
        {
            ++ item -> counter;
            item -> value = (item -> value - 0.1) * 1.25;
            printf ("Process %d: Counter: %d, value: %f\n",
                    getpid (), item -> counter, item -> value);
            stmSharedMemorySampleItemTypeUnlock (shm);
            stmSleepMs (10);
        }
    }
    stmSharedMemorySampleItemTypeDestroy (shm);
    if (child > 0)
    {
        stmProcessWait (child, NULL);
    }
    return 0;
}

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© Copyright Tom Michaelis 2002-2007

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