mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 14:20:07 +00:00
110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
/* Testing race while enabling lock elision.
|
|
Copyright (C) 2018-2024 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/>. */
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
#include <pthread.h>
|
|
#include <unistd.h>
|
|
#include <getopt.h>
|
|
#include <support/support.h>
|
|
#include <support/xthread.h>
|
|
|
|
static pthread_barrier_t barrier;
|
|
static pthread_mutex_t mutex;
|
|
static long long int iteration_count = 1000000;
|
|
static unsigned int thread_count = 3;
|
|
|
|
static void *
|
|
thr_func (void *arg)
|
|
{
|
|
long long int i;
|
|
for (i = 0; i < iteration_count; i++)
|
|
{
|
|
if ((uintptr_t) arg == 0)
|
|
{
|
|
xpthread_mutex_destroy (&mutex);
|
|
xpthread_mutex_init (&mutex, NULL);
|
|
}
|
|
|
|
xpthread_barrier_wait (&barrier);
|
|
|
|
/* Test if enabling lock elision works if it is enabled concurrently.
|
|
There was a race in FORCE_ELISION macro which leads to either
|
|
pthread_mutex_destroy returning EBUSY as the owner was recorded
|
|
by pthread_mutex_lock - in "normal mutex" code path - but was not
|
|
reset in pthread_mutex_unlock - in "elision" code path.
|
|
Or it leads to the assertion in nptl/pthread_mutex_lock.c:
|
|
assert (mutex->__data.__owner == 0);
|
|
Please ensure that the test is run with lock elision:
|
|
export GLIBC_TUNABLES=glibc.elision.enable=1 */
|
|
xpthread_mutex_lock (&mutex);
|
|
xpthread_mutex_unlock (&mutex);
|
|
|
|
xpthread_barrier_wait (&barrier);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
unsigned int i;
|
|
printf ("Starting %d threads to run %lld iterations.\n",
|
|
thread_count, iteration_count);
|
|
|
|
pthread_t *threads = xmalloc (thread_count * sizeof (pthread_t));
|
|
xpthread_barrier_init (&barrier, NULL, thread_count);
|
|
xpthread_mutex_init (&mutex, NULL);
|
|
|
|
for (i = 0; i < thread_count; i++)
|
|
threads[i] = xpthread_create (NULL, thr_func, (void *) (uintptr_t) i);
|
|
|
|
for (i = 0; i < thread_count; i++)
|
|
xpthread_join (threads[i]);
|
|
|
|
xpthread_barrier_destroy (&barrier);
|
|
free (threads);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
#define OPT_ITERATIONS 10000
|
|
#define OPT_THREADS 10001
|
|
#define CMDLINE_OPTIONS \
|
|
{ "iterations", required_argument, NULL, OPT_ITERATIONS }, \
|
|
{ "threads", required_argument, NULL, OPT_THREADS },
|
|
static void
|
|
cmdline_process (int c)
|
|
{
|
|
long long int arg = strtoll (optarg, NULL, 0);
|
|
switch (c)
|
|
{
|
|
case OPT_ITERATIONS:
|
|
if (arg > 0)
|
|
iteration_count = arg;
|
|
break;
|
|
case OPT_THREADS:
|
|
if (arg > 0 && arg < 100)
|
|
thread_count = arg;
|
|
break;
|
|
}
|
|
}
|
|
#define CMDLINE_PROCESS cmdline_process
|
|
#define TIMEOUT 50
|
|
#include <support/test-driver.c>
|