|
Packit |
6c4009 |
/* Test rdlock overflow.
|
|
Packit |
6c4009 |
Copyright (C) 2000-2018 Free Software Foundation, Inc.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is free software; you can redistribute it and/or
|
|
Packit |
6c4009 |
modify it under the terms of the GNU Lesser General Public License as
|
|
Packit |
6c4009 |
published by the Free Software Foundation; either version 2.1 of the
|
|
Packit |
6c4009 |
License, or (at your option) any later version.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
|
|
Packit |
6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit |
6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit |
6c4009 |
Lesser General Public License for more details.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
You should have received a copy of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
Packit |
6c4009 |
not, see <http://www.gnu.org/licenses/>. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#include <errno.h>
|
|
Packit |
6c4009 |
#include <error.h>
|
|
Packit |
6c4009 |
#include <pthread.h>
|
|
Packit |
6c4009 |
#include <stdio.h>
|
|
Packit |
6c4009 |
#include <stdlib.h>
|
|
Packit |
6c4009 |
#include <time.h>
|
|
Packit |
6c4009 |
#include <unistd.h>
|
|
Packit |
6c4009 |
#include <pthreadP.h>
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#define NREADERS 15
|
|
Packit |
6c4009 |
#define READTRIES 5000
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#define DELAY 1000000
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
static pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
|
|
Packit |
6c4009 |
static int eagain_returned = 0;
|
|
Packit |
6c4009 |
static int success_returned = 0;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
static void *
|
|
Packit |
6c4009 |
reader_thread (void *nr)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
struct timespec delay;
|
|
Packit |
6c4009 |
int n;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
delay.tv_sec = 0;
|
|
Packit |
6c4009 |
delay.tv_nsec = DELAY;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
for (n = 0; n < READTRIES; ++n)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
int err = pthread_rwlock_rdlock (&lock);
|
|
Packit |
6c4009 |
if (err == EAGAIN)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
atomic_store_relaxed (&eagain_returned, 1);
|
|
Packit |
6c4009 |
continue;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else if (err == 0)
|
|
Packit |
6c4009 |
atomic_store_relaxed (&success_returned, 1);
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
puts ("rdlock failed");
|
|
Packit |
6c4009 |
exit (1);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
nanosleep (&delay, NULL);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (pthread_rwlock_unlock (&lock) != 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
puts ("unlock for reader failed");
|
|
Packit |
6c4009 |
exit (1);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return NULL;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
static int
|
|
Packit |
6c4009 |
do_test (void)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
pthread_t thrd[NREADERS];
|
|
Packit |
6c4009 |
int n;
|
|
Packit |
6c4009 |
void *res;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Set the rwlock so that it's close to a reader overflow.
|
|
Packit |
6c4009 |
PTHREAD_RWLOCK_WRPHASE and PTHREAD_RWLOCK_WRLOCK are zero initially. */
|
|
Packit |
6c4009 |
unsigned int readers = PTHREAD_RWLOCK_READER_OVERFLOW
|
|
Packit |
6c4009 |
- ((NREADERS / 3) << PTHREAD_RWLOCK_READER_SHIFT);
|
|
Packit |
6c4009 |
lock.__data.__readers = readers;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
for (n = 0; n < NREADERS; ++n)
|
|
Packit |
6c4009 |
if (pthread_create (&thrd[n], NULL, reader_thread,
|
|
Packit |
6c4009 |
(void *) (long int) n) != 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
puts ("reader create failed");
|
|
Packit |
6c4009 |
exit (1);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Wait for all the threads. */
|
|
Packit |
6c4009 |
for (n = 0; n < NREADERS; ++n)
|
|
Packit |
6c4009 |
if (pthread_join (thrd[n], &res) != 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
puts ("reader join failed");
|
|
Packit |
6c4009 |
exit (1);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (atomic_load_relaxed (&eagain_returned) == 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
puts ("EAGAIN has never been returned");
|
|
Packit |
6c4009 |
exit (1);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (atomic_load_relaxed (&success_returned) == 0)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
puts ("rdlock was never successfully acquired");
|
|
Packit |
6c4009 |
exit (1);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (lock.__data.__readers != readers)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
puts ("__readers in rwlock differs from initial value");
|
|
Packit |
6c4009 |
exit (1);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return 0;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#define TIMEOUT 100
|
|
Packit |
6c4009 |
#define TEST_FUNCTION do_test ()
|
|
Packit |
6c4009 |
#include "../test-skeleton.c"
|