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sema.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 SEM_NAME1 "/tmp/foo.sem"
00044 #define SEM_NAME2 "/tmp/bar.sem"
00045 #define SEM_MODE  0666
00046 #define ITERATIONS 1000
00047 
00048 static PRBool debug_mode = PR_FALSE;
00049 static PRIntn iterations = ITERATIONS;
00050 static PRIntn counter;
00051 static PRSem *sem1, *sem2;
00052 
00053 /*
00054  * Thread 2 waits on semaphore 2 and posts to semaphore 1.
00055  */
00056 void ThreadFunc(void *arg)
00057 {
00058     PRIntn i;
00059 
00060     for (i = 0; i < iterations; i++) {
00061         if (PR_WaitSemaphore(sem2) == PR_FAILURE) {
00062             fprintf(stderr, "PR_WaitSemaphore failed\n");
00063             exit(1);
00064         }
00065         if (counter == 2*i+1) {
00066             if (debug_mode) printf("thread 2: counter = %d\n", counter);
00067         } else {
00068             fprintf(stderr, "thread 2: counter should be %d but is %d\n",
00069                     2*i+1, counter);
00070             exit(1);
00071         }
00072         counter++;
00073         if (PR_PostSemaphore(sem1) == PR_FAILURE) {
00074             fprintf(stderr, "PR_PostSemaphore failed\n");
00075             exit(1);
00076         }
00077     }
00078 }
00079 
00080 static void Help(void)
00081 {
00082     fprintf(stderr, "sema test program usage:\n");
00083     fprintf(stderr, "\t-d           debug mode         (FALSE)\n");
00084     fprintf(stderr, "\t-c <count>   loop count         (%d)\n", ITERATIONS);
00085     fprintf(stderr, "\t-h           this message\n");
00086 }  /* Help */
00087 
00088 int main(int argc, char **argv)
00089 {
00090     PRThread *thred;
00091     PRIntn i;
00092     PLOptStatus os;
00093     PLOptState *opt = PL_CreateOptState(argc, argv, "dc:h");
00094 
00095     while (PL_OPT_EOL != (os = PL_GetNextOpt(opt))) {
00096         if (PL_OPT_BAD == os) continue;
00097         switch (opt->option) {
00098             case 'd':  /* debug mode */
00099                 debug_mode = PR_TRUE;
00100                 break;
00101             case 'c':  /* loop count */
00102                 iterations = atoi(opt->value);
00103                 break;
00104             case 'h':
00105             default:
00106                 Help();
00107                 return 2;
00108         }
00109     }
00110     PL_DestroyOptState(opt);
00111 
00112     if (PR_DeleteSemaphore(SEM_NAME1) == PR_SUCCESS) {
00113         fprintf(stderr, "warning: removed semaphore %s left over "
00114                 "from previous run\n", SEM_NAME1);
00115     }
00116     if (PR_DeleteSemaphore(SEM_NAME2) == PR_SUCCESS) {
00117         fprintf(stderr, "warning: removed semaphore %s left over "
00118                 "from previous run\n", SEM_NAME2);
00119     }
00120 
00121     sem1 = PR_OpenSemaphore(SEM_NAME1, PR_SEM_CREATE, SEM_MODE, 1);
00122     if (NULL == sem1) {
00123         fprintf(stderr, "PR_OpenSemaphore failed (%d, %d)\n",
00124                 PR_GetError(), PR_GetOSError());
00125         exit(1);
00126     }
00127     sem2 = PR_OpenSemaphore(SEM_NAME2, PR_SEM_CREATE, SEM_MODE, 0);
00128     if (NULL == sem2) {
00129         fprintf(stderr, "PR_OpenSemaphore failed\n");
00130         exit(1);
00131     }
00132     thred = PR_CreateThread(PR_USER_THREAD, ThreadFunc, NULL,
00133             PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
00134     if (NULL == thred) {
00135         fprintf(stderr, "PR_CreateThread failed\n");
00136         exit(1);
00137     }
00138 
00139     /*
00140      * Thread 1 waits on semaphore 1 and posts to semaphore 2.
00141      */
00142     for (i = 0; i < iterations; i++) {
00143         if (PR_WaitSemaphore(sem1) == PR_FAILURE) {
00144             fprintf(stderr, "PR_WaitSemaphore failed\n");
00145             exit(1);
00146         }
00147         if (counter == 2*i) {
00148             if (debug_mode) printf("thread 1: counter = %d\n", counter);
00149         } else {
00150             fprintf(stderr, "thread 1: counter should be %d but is %d\n",
00151                     2*i, counter);
00152             exit(1);
00153         }
00154         counter++;
00155         if (PR_PostSemaphore(sem2) == PR_FAILURE) {
00156             fprintf(stderr, "PR_PostSemaphore failed\n");
00157             exit(1);
00158         }
00159     }
00160 
00161     if (PR_JoinThread(thred) == PR_FAILURE) {
00162         fprintf(stderr, "PR_JoinThread failed\n");
00163         exit(1);
00164     }
00165 
00166     if (PR_CloseSemaphore(sem1) == PR_FAILURE) {
00167         fprintf(stderr, "PR_CloseSemaphore failed\n");
00168     }
00169     if (PR_CloseSemaphore(sem2) == PR_FAILURE) {
00170         fprintf(stderr, "PR_CloseSemaphore failed\n");
00171     }
00172     if (PR_DeleteSemaphore(SEM_NAME1) == PR_FAILURE) {
00173         fprintf(stderr, "PR_DeleteSemaphore failed\n");
00174     }
00175     if (PR_DeleteSemaphore(SEM_NAME2) == PR_FAILURE) {
00176         fprintf(stderr, "PR_DeleteSemaphore failed\n");
00177     }
00178     printf("PASS\n");
00179     return 0;
00180 }