|
Packit Bot |
dc47af |
/* Test rwlock with PREFER_WRITER_NONRECURSIVE_NP (bug 23861).
|
|
Packit Bot |
dc47af |
Copyright (C) 2018 Free Software Foundation, Inc.
|
|
Packit Bot |
dc47af |
This file is part of the GNU C Library.
|
|
Packit Bot |
dc47af |
|
|
Packit Bot |
dc47af |
The GNU C Library is free software; you can redistribute it and/or
|
|
Packit Bot |
dc47af |
modify it under the terms of the GNU Lesser General Public
|
|
Packit Bot |
dc47af |
License as published by the Free Software Foundation; either
|
|
Packit Bot |
dc47af |
version 2.1 of the License, or (at your option) any later version.
|
|
Packit Bot |
dc47af |
|
|
Packit Bot |
dc47af |
The GNU C Library is distributed in the hope that it will be useful,
|
|
Packit Bot |
dc47af |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit Bot |
dc47af |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit Bot |
dc47af |
Lesser General Public License for more details.
|
|
Packit Bot |
dc47af |
|
|
Packit Bot |
dc47af |
You should have received a copy of the GNU Lesser General Public
|
|
Packit Bot |
dc47af |
License along with the GNU C Library; if not, see
|
|
Packit Bot |
dc47af |
<http://www.gnu.org/licenses/>. */
|
|
Packit Bot |
dc47af |
|
|
Packit Bot |
dc47af |
#include <stdio.h>
|
|
Packit Bot |
dc47af |
#include <stdlib.h>
|
|
Packit Bot |
dc47af |
#include <unistd.h>
|
|
Packit Bot |
dc47af |
#include <pthread.h>
|
|
Packit Bot |
dc47af |
#include <support/xthread.h>
|
|
Packit Bot |
dc47af |
|
|
Packit Bot |
dc47af |
/* We choose 10 iterations because this happens to be able to trigger the
|
|
Packit Bot |
dc47af |
stall on contemporary hardware. */
|
|
Packit Bot |
dc47af |
#define LOOPS 10
|
|
Packit Bot |
dc47af |
/* We need 3 threads to trigger bug 23861. One thread as a writer, and
|
|
Packit Bot |
dc47af |
two reader threads. The test verifies that the second-to-last reader
|
|
Packit Bot |
dc47af |
is able to notify the *last* reader that it should be done waiting.
|
|
Packit Bot |
dc47af |
If the second-to-last reader fails to notify the last reader or does
|
|
Packit Bot |
dc47af |
so incorrectly then the last reader may stall indefinitely. */
|
|
Packit Bot |
dc47af |
#define NTHREADS 3
|
|
Packit Bot |
dc47af |
|
|
Packit Bot |
dc47af |
_Atomic int do_exit;
|
|
Packit Bot |
dc47af |
pthread_rwlockattr_t mylock_attr;
|
|
Packit Bot |
dc47af |
pthread_rwlock_t mylock;
|
|
Packit Bot |
dc47af |
|
|
Packit Bot |
dc47af |
void *
|
|
Packit Bot |
dc47af |
run_loop (void *a)
|
|
Packit Bot |
dc47af |
{
|
|
Packit Bot |
dc47af |
while (!do_exit)
|
|
Packit Bot |
dc47af |
{
|
|
Packit Bot |
dc47af |
if (random () & 1)
|
|
Packit Bot |
dc47af |
{
|
|
Packit Bot |
dc47af |
xpthread_rwlock_wrlock (&mylock);
|
|
Packit Bot |
dc47af |
xpthread_rwlock_unlock (&mylock);
|
|
Packit Bot |
dc47af |
}
|
|
Packit Bot |
dc47af |
else
|
|
Packit Bot |
dc47af |
{
|
|
Packit Bot |
dc47af |
xpthread_rwlock_rdlock (&mylock);
|
|
Packit Bot |
dc47af |
xpthread_rwlock_unlock (&mylock);
|
|
Packit Bot |
dc47af |
}
|
|
Packit Bot |
dc47af |
}
|
|
Packit Bot |
dc47af |
return NULL;
|
|
Packit Bot |
dc47af |
}
|
|
Packit Bot |
dc47af |
|
|
Packit Bot |
dc47af |
int
|
|
Packit Bot |
dc47af |
do_test (void)
|
|
Packit Bot |
dc47af |
{
|
|
Packit Bot |
dc47af |
xpthread_rwlockattr_init (&mylock_attr);
|
|
Packit Bot |
dc47af |
xpthread_rwlockattr_setkind_np (&mylock_attr,
|
|
Packit Bot |
dc47af |
PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP);
|
|
Packit Bot |
dc47af |
xpthread_rwlock_init (&mylock, &mylock_attr);
|
|
Packit Bot |
dc47af |
|
|
Packit Bot |
dc47af |
for (int n = 0; n < LOOPS; n++)
|
|
Packit Bot |
dc47af |
{
|
|
Packit Bot |
dc47af |
pthread_t tids[NTHREADS];
|
|
Packit Bot |
dc47af |
do_exit = 0;
|
|
Packit Bot |
dc47af |
for (int i = 0; i < NTHREADS; i++)
|
|
Packit Bot |
dc47af |
tids[i] = xpthread_create (NULL, run_loop, NULL);
|
|
Packit Bot |
dc47af |
/* Let the threads run for some time. */
|
|
Packit Bot |
dc47af |
sleep (1);
|
|
Packit Bot |
dc47af |
printf ("Exiting...");
|
|
Packit Bot |
dc47af |
fflush (stdout);
|
|
Packit Bot |
dc47af |
do_exit = 1;
|
|
Packit Bot |
dc47af |
for (int i = 0; i < NTHREADS; i++)
|
|
Packit Bot |
dc47af |
xpthread_join (tids[i]);
|
|
Packit Bot |
dc47af |
printf ("done.\n");
|
|
Packit Bot |
dc47af |
}
|
|
Packit Bot |
dc47af |
pthread_rwlock_destroy (&mylock);
|
|
Packit Bot |
dc47af |
pthread_rwlockattr_destroy (&mylock_attr);
|
|
Packit Bot |
dc47af |
return 0;
|
|
Packit Bot |
dc47af |
}
|
|
Packit Bot |
dc47af |
|
|
Packit Bot |
dc47af |
#define TIMEOUT (DEFAULT_TIMEOUT + 3 * LOOPS)
|
|
Packit Bot |
dc47af |
#include <support/test-driver.c>
|