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/* Test support for single-thread optimizations. No threads, static dlopen.
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/>. */
/* In a static dlopen scenario, the single-threaded optimization is
not possible because their is no globally shared dynamic linker
across all namespaces. */
#include <stddef.h>
#include <support/check.h>
#include <support/xdlfcn.h>
#include <sys/single_threaded.h>
static int
do_test (void)
{
TEST_VERIFY (__libc_single_threaded);
/* Defined in tst-single-threaded-mod1.o. */
extern _Bool single_threaded_1 (void);
TEST_VERIFY (single_threaded_1 ());
/* A failed dlopen does not change the multi-threaded status. */
TEST_VERIFY (dlopen ("tst-single_threaded-does-not-exist.so", RTLD_LAZY)
== NULL);
TEST_VERIFY (__libc_single_threaded);
TEST_VERIFY (single_threaded_1 ());
/* And neither does a successful dlopen for outer (static) libc. */
void *handle_mod2 = xdlopen ("tst-single_threaded-mod2.so", RTLD_LAZY);
_Bool (*single_threaded_2) (void)
= xdlsym (handle_mod2, "single_threaded_2");
TEST_VERIFY (__libc_single_threaded);
TEST_VERIFY (single_threaded_1 ());
/* The inner libc always assumes multi-threaded use. */
TEST_VERIFY (!single_threaded_2 ());
xdlclose (handle_mod2);
return 0;
}
#include <support/test-driver.c>
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