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/* Helper program for testing the pthread_rwlock_t pretty printer.
Copyright (C) 2016-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Keep the calls to the pthread_* functions on separate lines to make it easy
to advance through the program using the gdb 'next' command. */
#include <pthread.h>
#define PASS 0
#define FAIL 1
static int test_locking_reader (pthread_rwlock_t *rwlock);
static int test_locking_writer (pthread_rwlock_t *rwlock);
int
main (void)
{
pthread_rwlock_t rwlock;
int result = FAIL;
if (test_locking_reader (&rwlock) == PASS
&& test_locking_writer (&rwlock) == PASS)
result = PASS;
/* Else, one of the pthread_rwlock* functions failed. */
return result;
}
/* Tests locking the rwlock multiple times as a reader. */
static int
test_locking_reader (pthread_rwlock_t *rwlock)
{
int result = FAIL;
if (pthread_rwlock_init (rwlock, NULL) == 0
&& pthread_rwlock_rdlock (rwlock) == 0 /* Test locking (reader). */
&& pthread_rwlock_rdlock (rwlock) == 0
&& pthread_rwlock_rdlock (rwlock) == 0
&& pthread_rwlock_unlock (rwlock) == 0
&& pthread_rwlock_unlock (rwlock) == 0
&& pthread_rwlock_unlock (rwlock) == 0
&& pthread_rwlock_destroy (rwlock) == 0)
result = PASS;
return result;
}
/* Tests locking the rwlock as a writer. */
static int
test_locking_writer (pthread_rwlock_t *rwlock)
{
int result = FAIL;
if (pthread_rwlock_init (rwlock, NULL) == 0
&& pthread_rwlock_wrlock (rwlock) == 0 /* Test locking (writer). */
&& pthread_rwlock_unlock (rwlock) == 0
&& pthread_rwlock_destroy (rwlock) == 0)
result = PASS;
return result;
}
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