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namedconditiontest.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 
00070 #include <stdio.h>
00071 #include <string.h>
00072 #include <errno.h>
00073 #include <stm/system.h>
00074 
00087 int main (int argc, char **argv)
00088 {
00089     pid_t child = (pid_t) -1;
00090     StmNamedMutex requestMutex = stmNamedMutexCreate
00091     (
00092         argc == 1 ? "RequestMutex%p" : argv [1],
00093         StmFalse,
00094         StmAttach
00095     );
00096     StmNamedCondition requestCond = stmNamedConditionCreate
00097     (
00098         argc == 1 ? "RequestCondition%p" : argv [2]
00099     );
00100     StmNamedMutex responseMutex = stmNamedMutexCreate
00101     (
00102         argc == 1 ? "ResponseMutex%p" : argv [3],
00103         StmFalse,
00104         StmAttach
00105     );
00106     StmNamedCondition responseCond = stmNamedConditionCreate
00107     (
00108         argc == 1 ? "ResponseCondition%p" : argv [4]
00109     );
00110     if (argc == 1)
00111     {
00112         int counter = 0;
00113         char *const childArgv [] =
00114         {
00115             argv [0],
00116             (char *) stmNamedMutexName (requestMutex),
00117             (char *) stmNamedConditionName (requestCond),
00118             (char *) stmNamedMutexName (responseMutex),
00119             (char *) stmNamedConditionName (responseCond),
00120             NULL
00121         };
00122         if ((child = stmProcessSpawn (argv [0], childArgv, StmFalse)) < 0)
00123         {
00124             printf ("%s: stmProcessSpawn failed: %s\n",
00125                     argv [0], strerror (errno));
00126             exit (1);
00127         }
00128         stmNamedMutexLock (requestMutex);
00129         while (counter < 20)
00130         {
00131             switch
00132             (
00133                 stmNamedConditionTimedWait
00134                 (
00135                     requestCond,
00136                     requestMutex,
00137                     stmGetMsTime () + 10
00138                 )
00139             )
00140             {
00141             case 0:
00142                 stmNamedMutexLock (responseMutex);
00143                 stmNamedConditionSignal (responseCond);
00144                 printf ("Server %d: Got request %d from client\n",
00145                         getpid (), ++ counter);
00146                 stmNamedMutexUnlock (responseMutex);
00147                 break;
00148             case 1:
00149                 break;
00150             default:
00151                 counter = 20;
00152                 printf ("Server %d: Waiting for request failed: %s: aborted\n",
00153                         getpid (), strerror (errno));
00154                 break;
00155             }
00156         }
00157         stmNamedMutexUnlock (requestMutex);
00158         stmProcessWait (child, NULL);
00159     }
00160     else
00161     {
00162         int counter = 0;
00163         stmNamedMutexLock (responseMutex);
00164         while (counter < 20)
00165         {
00166             if
00167             (
00168                 stmNamedMutexLock (requestMutex) ||
00169                 stmNamedConditionSignal (requestCond) ||
00170                 stmNamedMutexUnlock (requestMutex) ||
00171                 stmNamedConditionTimedWait
00172                 (
00173                     responseCond,
00174                     responseMutex,
00175                     stmGetMsTime () + 100
00176                 )
00177             )
00178             {
00179                 counter = 20;
00180                 printf ("Client %d: Request for server failed: %s: aborted\n",
00181                         getpid (), strerror (errno));
00182             }
00183             else
00184             {
00185                 printf ("Client %d: Got response %d from server\n",
00186                         getpid (), ++ counter);
00187             }
00188         }
00189         stmNamedMutexUnlock (responseMutex);
00190     }
00191     stmNamedConditionDestroy (responseCond);
00192     stmNamedMutexDestroy (responseMutex);
00193     stmNamedConditionDestroy (requestCond);
00194     stmNamedMutexDestroy (requestMutex);
00195     return 0;
00196 }
00197 
00198 

© Copyright Tom Michaelis 2002-2007

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