external/bsd/bind/dist/bin/tests/rwlock_test.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 1998-2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: rwlock_test.c,v 1.26 2007/06/19 23:46:59 tbox Exp */
  21
  22 #include <config.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27
  28 #include <isc/print.h>
  29 #include <isc/thread.h>
  30 #include <isc/rwlock.h>
  31 #include <isc/string.h>
  32 #include <isc/util.h>
  33
  34 #ifdef ISC_PLATFORM_USETHREADS
  35
  36 isc_rwlock_t lock;
  37
  38 static void *
  39 run1(void *arg) {
  40         char *message = arg;
  41
  42         RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_read) ==
  43                       ISC_R_SUCCESS);
  44         printf("%s got READ lock\n", message);
  45         sleep(1);
  46         printf("%s giving up READ lock\n", message);
  47         RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_read) ==
  48                ISC_R_SUCCESS);
  49         RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_read) ==
  50                       ISC_R_SUCCESS);
  51         printf("%s got READ lock\n", message);
  52         sleep(1);
  53         printf("%s giving up READ lock\n", message);
  54         RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_read) ==
  55                ISC_R_SUCCESS);
  56         RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_write) ==
  57                       ISC_R_SUCCESS);
  58         printf("%s got WRITE lock\n", message);
  59         sleep(1);
  60         printf("%s giving up WRITE lock\n", message);
  61         RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_write) ==
  62                ISC_R_SUCCESS);
  63         return (NULL);
  64 }
  65
  66 static void *
  67 run2(void *arg) {
  68         char *message = arg;
  69
  70         RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_write) ==
  71                       ISC_R_SUCCESS);
  72         printf("%s got WRITE lock\n", message);
  73         sleep(1);
  74         printf("%s giving up WRITE lock\n", message);
  75         RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_write) ==
  76                ISC_R_SUCCESS);
  77         RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_write) ==
  78                       ISC_R_SUCCESS);
  79         printf("%s got WRITE lock\n", message);
  80         sleep(1);
  81         printf("%s giving up WRITE lock\n", message);
  82         RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_write) ==
  83                ISC_R_SUCCESS);
  84         RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_read) ==
  85                       ISC_R_SUCCESS);
  86         printf("%s got READ lock\n", message);
  87         sleep(1);
  88         printf("%s giving up READ lock\n", message);
  89         RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_read) ==
  90                ISC_R_SUCCESS);
  91         return (NULL);
  92 }
  93
  94 int
  95 main(int argc, char *argv[]) {
  96         unsigned int nworkers;
  97         unsigned int i;
  98         isc_thread_t workers[100];
  99         char name[100];
 100         void *dupname;
 101
 102         if (argc > 1)
 103                 nworkers = atoi(argv[1]);
 104         else
 105                 nworkers = 2;
 106         if (nworkers > 100)
 107                 nworkers = 100;
 108         printf("%d workers\n", nworkers);
 109
 110         RUNTIME_CHECK(isc_rwlock_init(&lock, 5, 10) == ISC_R_SUCCESS);
 111
 112         for (i = 0; i < nworkers; i++) {
 113                 sprintf(name, "%02u", i);
 114                 dupname = strdup(name);
 115                 RUNTIME_CHECK(dupname != NULL);
 116                 if (i != 0 && i % 3 == 0)
 117                         RUNTIME_CHECK(isc_thread_create(run1, dupname,
 118                                                         &workers[i]) ==
 119                                ISC_R_SUCCESS);
 120                 else
 121                         RUNTIME_CHECK(isc_thread_create(run2, dupname,
 122                                                         &workers[i]) ==
 123                                ISC_R_SUCCESS);
 124         }
 125
 126         for (i = 0; i < nworkers; i++)
 127                 (void)isc_thread_join(workers[i], NULL);
 128
 129         isc_rwlock_destroy(&lock);
 130
 131         return (0);
 132 }
 133
 134 #else
 135
 136 int
 137 main(int argc, char *argv[]) {
 138         UNUSED(argc);
 139         UNUSED(argv);
 140         fprintf(stderr, "This test requires threads.\n");
 141         return(1);
 142 }
 143
 144 #endif