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bind/bin/tests/rwlock_test.c

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/*
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* Copyright (C) 1998-2000 Internet Software Consortium.
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*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: rwlock_test.c,v 1.17 2000/07/27 09:38:26 tale Exp $ */
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#include <config.h>
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <isc/thread.h>
#include <isc/rwlock.h>
#include <isc/string.h>
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#include <isc/util.h>
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isc_rwlock_t lock;
static void *
run1(void *arg) {
char *message = arg;
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RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_read) ==
ISC_R_SUCCESS);
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printf("%s got READ lock\n", message);
sleep(1);
printf("%s giving up READ lock\n", message);
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RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_read) ==
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ISC_R_SUCCESS);
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RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_read) ==
ISC_R_SUCCESS);
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printf("%s got READ lock\n", message);
sleep(1);
printf("%s giving up READ lock\n", message);
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RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_read) ==
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ISC_R_SUCCESS);
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RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_write) ==
ISC_R_SUCCESS);
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printf("%s got WRITE lock\n", message);
sleep(1);
printf("%s giving up WRITE lock\n", message);
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RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_write) ==
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ISC_R_SUCCESS);
return (NULL);
}
static void *
run2(void *arg) {
char *message = arg;
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RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_write) ==
ISC_R_SUCCESS);
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printf("%s got WRITE lock\n", message);
sleep(1);
printf("%s giving up WRITE lock\n", message);
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RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_write) ==
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ISC_R_SUCCESS);
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RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_write) ==
ISC_R_SUCCESS);
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printf("%s got WRITE lock\n", message);
sleep(1);
printf("%s giving up WRITE lock\n", message);
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RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_write) ==
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ISC_R_SUCCESS);
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RUNTIME_CHECK(isc_rwlock_lock(&lock, isc_rwlocktype_read) ==
ISC_R_SUCCESS);
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printf("%s got READ lock\n", message);
sleep(1);
printf("%s giving up READ lock\n", message);
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RUNTIME_CHECK(isc_rwlock_unlock(&lock, isc_rwlocktype_read) ==
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ISC_R_SUCCESS);
return (NULL);
}
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int
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main(int argc, char *argv[]) {
unsigned int nworkers;
unsigned int i;
isc_thread_t workers[100];
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char name[100];
void *dupname;
if (argc > 1)
nworkers = atoi(argv[1]);
else
nworkers = 2;
if (nworkers > 100)
nworkers = 100;
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printf("%d workers\n", nworkers);
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RUNTIME_CHECK(isc_rwlock_init(&lock, 5, 10) == ISC_R_SUCCESS);
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for (i = 0; i < nworkers; i++) {
sprintf(name, "%02u", i);
dupname = strdup(name);
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RUNTIME_CHECK(dupname != NULL);
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if (i != 0 && i % 3 == 0)
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RUNTIME_CHECK(isc_thread_create(run1, dupname,
&workers[i]) ==
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ISC_R_SUCCESS);
else
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RUNTIME_CHECK(isc_thread_create(run2, dupname,
&workers[i]) ==
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ISC_R_SUCCESS);
}
for (i = 0; i < nworkers; i++)
(void)isc_thread_join(workers[i], NULL);
isc_rwlock_destroy(&lock);
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return (0);
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}