87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/* Test support for single-thread optimizations. With threads, static version.
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Copyright (C) 2020-2022 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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/* This test is a stripped-down version of
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tst-single_threaded-pthread.c, without any loading of dynamic
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objects. */
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#include <stdio.h>
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#include <support/check.h>
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#include <support/xthread.h>
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#include <sys/single_threaded.h>
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/* First barrier synchronizes main thread, thread 1, thread 2. */
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static pthread_barrier_t barrier1;
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/* Second barrier synchronizes main thread, thread 2. */
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static pthread_barrier_t barrier2;
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static void *
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threadfunc (void *closure)
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{
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TEST_VERIFY (!__libc_single_threaded);
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/* Wait for the main thread and the other thread. */
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xpthread_barrier_wait (&barrier1);
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TEST_VERIFY (!__libc_single_threaded);
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/* Second thread waits on second barrier, too. */
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if (closure != NULL)
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xpthread_barrier_wait (&barrier2);
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TEST_VERIFY (!__libc_single_threaded);
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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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TEST_VERIFY (__libc_single_threaded);
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/* Two threads plus main thread. */
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xpthread_barrier_init (&barrier1, NULL, 3);
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/* Main thread and second thread. */
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xpthread_barrier_init (&barrier2, NULL, 2);
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pthread_t thr1 = xpthread_create (NULL, threadfunc, NULL);
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TEST_VERIFY (!__libc_single_threaded);
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pthread_t thr2 = xpthread_create (NULL, threadfunc, &thr2);
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TEST_VERIFY (!__libc_single_threaded);
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xpthread_barrier_wait (&barrier1);
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TEST_VERIFY (!__libc_single_threaded);
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/* Join first thread. This should not bring us back into
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single-threaded mode. */
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xpthread_join (thr1);
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TEST_VERIFY (!__libc_single_threaded);
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/* We may be back in single-threaded mode after joining both
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threads, but this is not guaranteed. */
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xpthread_barrier_wait (&barrier2);
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xpthread_join (thr2);
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printf ("info: __libc_single_threaded after joining all threads: %d\n",
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__libc_single_threaded);
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return 0;
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}
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#include <support/test-driver.c>
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