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/* Test support for single-thread optimizations. With threads, static version.
Copyright (C) 2020-2024 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/>. */
/* This test is a stripped-down version of
tst-single_threaded-pthread.c, without any loading of dynamic
objects. */
#include <stdio.h>
#include <support/check.h>
#include <support/xthread.h>
#include <sys/single_threaded.h>
/* First barrier synchronizes main thread, thread 1, thread 2. */
static pthread_barrier_t barrier1;
/* Second barrier synchronizes main thread, thread 2. */
static pthread_barrier_t barrier2;
static void *
threadfunc (void *closure)
{
TEST_VERIFY (!__libc_single_threaded);
/* Wait for the main thread and the other thread. */
xpthread_barrier_wait (&barrier1);
TEST_VERIFY (!__libc_single_threaded);
/* Second thread waits on second barrier, too. */
if (closure != NULL)
xpthread_barrier_wait (&barrier2);
TEST_VERIFY (!__libc_single_threaded);
return NULL;
}
static int
do_test (void)
{
TEST_VERIFY (__libc_single_threaded);
/* Two threads plus main thread. */
xpthread_barrier_init (&barrier1, NULL, 3);
/* Main thread and second thread. */
xpthread_barrier_init (&barrier2, NULL, 2);
pthread_t thr1 = xpthread_create (NULL, threadfunc, NULL);
TEST_VERIFY (!__libc_single_threaded);
pthread_t thr2 = xpthread_create (NULL, threadfunc, &thr2);
TEST_VERIFY (!__libc_single_threaded);
xpthread_barrier_wait (&barrier1);
TEST_VERIFY (!__libc_single_threaded);
/* Join first thread. This should not bring us back into
single-threaded mode. */
xpthread_join (thr1);
TEST_VERIFY (!__libc_single_threaded);
/* We may be back in single-threaded mode after joining both
threads, but this is not guaranteed. */
xpthread_barrier_wait (&barrier2);
xpthread_join (thr2);
printf ("info: __libc_single_threaded after joining all threads: %d\n",
__libc_single_threaded);
return 0;
}
#include <support/test-driver.c>
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