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sharedmemorytest.c

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00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00003  *
00004  * The contents of this file are subject to the Mozilla Public License Version
00005  * 1.1 (the "License"); you may not use this file except in compliance with
00006  * the License. You may obtain a copy of the License at
00007  * http://www.mozilla.org/MPL/
00008  *
00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is the SysToMath C Libraries package (LibStmC).
00015  *
00016  * The Initial Developer of the Original Code is
00017  * Tom Michaelis, SysToMath.
00018  * Portions created by the Initial Developer are Copyright (C) 1994-2006
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *
00023  * Alternatively, the contents of this file may be used under the terms of
00024  * either the GNU General Public License Version 2 or later (the "GPL"), or
00025  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00026  * in which case the provisions of the GPL or the LGPL are applicable instead
00027  * of those above. If you wish to allow use of your version of this file only
00028  * under the terms of either the GPL or the LGPL, and not to allow others to
00029  * use your version of this file under the terms of the MPL, indicate your
00030  * decision by deleting the provisions above and replace them with the notice
00031  * and other provisions required by the GPL or the LGPL. If you do not delete
00032  * the provisions above, a recipient may use your version of this file under
00033  * the terms of any one of the MPL, the GPL or the LGPL.
00034  *
00035  * ***** END LICENSE BLOCK ***** */
00036 
00037 /******************************************************************************
00038  *                       First Release 1994-07-20
00039  ******************************************************************************/
00040 
00041 
00077 #include <stdio.h>
00078 #include <string.h>
00079 #include <errno.h>
00080 #include <stm/system.h>
00081 
00082 
00087 StmAbstractType (SampleItemType)  /* SampleSharedMemory */
00088 
00089 
00094 struct SampleItemTypeImpl_
00095 {
00096     int counter;
00097     double value;
00098 };
00099 
00103 static int stmSampleItemTypeInit (SampleItemType item, void *data)
00104 {
00105     item -> counter = 0;
00106     item -> value = * (double *) data;
00107     return 0;
00108 }
00109 
00113 static int stmSampleItemTypeDeinit (SampleItemType item)
00114 {
00115     return 0;
00116 }
00117 
00120 StmSharedMemoryItemDefine (SampleItemType, 100)  /* SampleSharedMemory */
00121 
00122 
00124 static StmSharedMemorySampleItemType shm;
00125 
00138 int main (int argc, char **argv)
00139 {
00140     pid_t child = (pid_t) -1;
00141     int i;
00142     double begval = 0.99;
00143     shm = stmSharedMemorySampleItemTypeCreate
00144     (
00145         argc == 1 ? "SampelItemTypeTestShm%p" : argv [1],
00146         StmAttach,
00147         &begval
00148     );
00149     if (!shm)
00150     {
00151         printf ("Process %d: stmSharedMemorySampleItemTypeCreate failed: %s\n",
00152                 getpid (), strerror (errno));
00153         exit (1);
00154     }
00155     if (argc == 1)
00156     {
00157         char *const childArgv [] =
00158         {
00159             argv [0],
00160             (char *) stmSharedMemorySampleItemTypeName (shm),
00161             NULL
00162         };
00163         if ((child = stmProcessSpawn (argv [0], childArgv, StmFalse)) < 0)
00164         {
00165             printf ("%s: stmProcessSpawn failed: %s\n",
00166                     argv [0], strerror (errno));
00167             exit (1);
00168         }
00169     }
00170     for (i = 0; i < 10; ++ i)
00171     {
00172         SampleItemType item = stmSharedMemorySampleItemTypeLock (shm);
00173         if (!item)
00174         {
00175             printf ("Process %d: stmSharedMemorySampleItemTypeLock failed: %s\n",
00176                     getpid (), strerror (errno));
00177         }
00178         else
00179         {
00180             ++ item -> counter;
00181             item -> value = (item -> value - 0.1) * 1.25;
00182             printf ("Process %d: Counter: %d, value: %f\n",
00183                     getpid (), item -> counter, item -> value);
00184             stmSharedMemorySampleItemTypeUnlock (shm);
00185             stmSleepMs (10);
00186         }
00187     }
00188     stmSharedMemorySampleItemTypeDestroy (shm);
00189     if (child > 0)
00190     {
00191         stmProcessWait (child, NULL);
00192     }
00193     return 0;
00194 }
00195 
00196 

© Copyright Tom Michaelis 2002-2007

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