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semapong.c
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1999-2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include "nspr.h"
00039 #include "plgetopt.h"
00040 
00041 #include <stdio.h>
00042 
00043 #define SHM_NAME "/tmp/counter"
00044 #define SEM_NAME1 "/tmp/foo.sem"
00045 #define SEM_NAME2 "/tmp/bar.sem"
00046 #define ITERATIONS 1000
00047 
00048 static PRBool debug_mode = PR_FALSE;
00049 static PRIntn iterations = ITERATIONS;
00050 static PRSem *sem1, *sem2;
00051 
00052 static void Help(void)
00053 {
00054     fprintf(stderr, "semapong test program usage:\n");
00055     fprintf(stderr, "\t-d           debug mode         (FALSE)\n");
00056     fprintf(stderr, "\t-c <count>   loop count         (%d)\n", ITERATIONS);
00057     fprintf(stderr, "\t-h           this message\n");
00058 }  /* Help */
00059 
00060 int main(int argc, char **argv)
00061 {
00062     PRIntn i;
00063     PRSharedMemory *shm;
00064     PRIntn *counter_addr;
00065     PLOptStatus os;
00066     PLOptState *opt = PL_CreateOptState(argc, argv, "dc:h");
00067 
00068     while (PL_OPT_EOL != (os = PL_GetNextOpt(opt))) {
00069         if (PL_OPT_BAD == os) continue;
00070         switch (opt->option) {
00071             case 'd':  /* debug mode */
00072                 debug_mode = PR_TRUE;
00073                 break;
00074             case 'c':  /* loop count */
00075                 iterations = atoi(opt->value);
00076                 break;
00077             case 'h':
00078             default:
00079                 Help();
00080                 return 2;
00081         }
00082     }
00083     PL_DestroyOptState(opt);
00084 
00085     shm = PR_OpenSharedMemory(SHM_NAME, sizeof(*counter_addr), 0, 0666);
00086     if (NULL == shm) {
00087         fprintf(stderr, "PR_OpenSharedMemory failed (%d, %d)\n",
00088                 PR_GetError(), PR_GetOSError());
00089         exit(1);
00090     }
00091     sem1 = PR_OpenSemaphore(SEM_NAME1, 0, 0, 0);
00092     if (NULL == sem1) {
00093         fprintf(stderr, "PR_OpenSemaphore failed (%d, %d)\n",
00094                 PR_GetError(), PR_GetOSError());
00095         exit(1);
00096     }
00097     sem2 = PR_OpenSemaphore(SEM_NAME2, 0, 0, 0);
00098     if (NULL == sem2) {
00099         fprintf(stderr, "PR_OpenSemaphore failed (%d, %d)\n",
00100                 PR_GetError(), PR_GetOSError());
00101         exit(1);
00102     }
00103 
00104     counter_addr = PR_AttachSharedMemory(shm, 0);
00105     if (NULL == counter_addr) {
00106         fprintf(stderr, "PR_AttachSharedMemory failed\n");
00107         exit(1);
00108     }
00109 
00110     /*
00111      * Process 2 waits on semaphore 2 and posts to semaphore 1.
00112      */
00113     for (i = 0; i < iterations; i++) {
00114         if (PR_WaitSemaphore(sem2) == PR_FAILURE) {
00115             fprintf(stderr, "PR_WaitSemaphore failed\n");
00116             exit(1);
00117         }
00118         if (*counter_addr == 2*i+1) {
00119             if (debug_mode) printf("process 2: counter = %d\n", *counter_addr);
00120         } else {
00121             fprintf(stderr, "process 2: counter should be %d but is %d\n",
00122                     2*i+1, *counter_addr);
00123             exit(1);
00124         }
00125         (*counter_addr)++;
00126         if (PR_PostSemaphore(sem1) == PR_FAILURE) {
00127             fprintf(stderr, "PR_PostSemaphore failed\n");
00128             exit(1);
00129         }
00130     }
00131     if (PR_DetachSharedMemory(shm, counter_addr) == PR_FAILURE) {
00132         fprintf(stderr, "PR_DetachSharedMemory failed\n");
00133         exit(1);
00134     }
00135     if (PR_CloseSharedMemory(shm) == PR_FAILURE) {
00136         fprintf(stderr, "PR_CloseSharedMemory failed\n");
00137         exit(1);
00138     }
00139     if (PR_CloseSemaphore(sem1) == PR_FAILURE) {
00140         fprintf(stderr, "PR_CloseSemaphore failed\n");
00141     }
00142     if (PR_CloseSemaphore(sem2) == PR_FAILURE) {
00143         fprintf(stderr, "PR_CloseSemaphore failed\n");
00144     }
00145     printf("PASS\n");
00146     return 0;
00147 }