110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
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/* Testing race while enabling lock elision.
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Copyright (C) 2018-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <support/support.h>
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#include <support/xthread.h>
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static pthread_barrier_t barrier;
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static pthread_mutex_t mutex;
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static long long int iteration_count = 1000000;
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static unsigned int thread_count = 3;
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static void *
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thr_func (void *arg)
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{
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long long int i;
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for (i = 0; i < iteration_count; i++)
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{
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if ((uintptr_t) arg == 0)
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{
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xpthread_mutex_destroy (&mutex);
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xpthread_mutex_init (&mutex, NULL);
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}
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xpthread_barrier_wait (&barrier);
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/* Test if enabling lock elision works if it is enabled concurrently.
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There was a race in FORCE_ELISION macro which leads to either
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pthread_mutex_destroy returning EBUSY as the owner was recorded
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by pthread_mutex_lock - in "normal mutex" code path - but was not
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resetted in pthread_mutex_unlock - in "elision" code path.
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Or it leads to the assertion in nptl/pthread_mutex_lock.c:
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assert (mutex->__data.__owner == 0);
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Please ensure that the test is run with lock elision:
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export GLIBC_TUNABLES=glibc.elision.enable=1 */
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xpthread_mutex_lock (&mutex);
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xpthread_mutex_unlock (&mutex);
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xpthread_barrier_wait (&barrier);
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}
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return NULL;
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}
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static int
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do_test (void)
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{
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unsigned int i;
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printf ("Starting %d threads to run %lld iterations.\n",
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thread_count, iteration_count);
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pthread_t *threads = xmalloc (thread_count * sizeof (pthread_t));
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xpthread_barrier_init (&barrier, NULL, thread_count);
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xpthread_mutex_init (&mutex, NULL);
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for (i = 0; i < thread_count; i++)
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threads[i] = xpthread_create (NULL, thr_func, (void *) (uintptr_t) i);
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for (i = 0; i < thread_count; i++)
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xpthread_join (threads[i]);
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xpthread_barrier_destroy (&barrier);
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free (threads);
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return EXIT_SUCCESS;
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}
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#define OPT_ITERATIONS 10000
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#define OPT_THREADS 10001
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#define CMDLINE_OPTIONS \
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{ "iterations", required_argument, NULL, OPT_ITERATIONS }, \
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{ "threads", required_argument, NULL, OPT_THREADS },
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static void
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cmdline_process (int c)
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{
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long long int arg = strtoll (optarg, NULL, 0);
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switch (c)
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{
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case OPT_ITERATIONS:
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if (arg > 0)
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iteration_count = arg;
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break;
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case OPT_THREADS:
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if (arg > 0 && arg < 100)
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thread_count = arg;
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break;
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}
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}
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#define CMDLINE_PROCESS cmdline_process
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#define TIMEOUT 50
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#include <support/test-driver.c>
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