2020-05-20 13:40:35 +00:00
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/* Test support for single-thread optimizations. No threads, static dlopen.
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2022-01-01 18:54:23 +00:00
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Copyright (C) 2020-2022 Free Software Foundation, Inc.
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2020-05-20 13:40:35 +00:00
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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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/* In a static dlopen scenario, the single-threaded optimization is
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not possible because their is no globally shared dynamic linker
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across all namespaces. */
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#include <stddef.h>
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#include <support/check.h>
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#include <support/xdlfcn.h>
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#include <sys/single_threaded.h>
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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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/* Defined in tst-single-threaded-mod1.o. */
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extern _Bool single_threaded_1 (void);
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TEST_VERIFY (single_threaded_1 ());
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/* A failed dlopen does not change the multi-threaded status. */
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TEST_VERIFY (dlopen ("tst-single_threaded-does-not-exist.so", RTLD_LAZY)
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== NULL);
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TEST_VERIFY (__libc_single_threaded);
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TEST_VERIFY (single_threaded_1 ());
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/* And neither does a successful dlopen for outer (static) libc. */
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void *handle_mod2 = xdlopen ("tst-single_threaded-mod2.so", RTLD_LAZY);
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_Bool (*single_threaded_2) (void)
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= xdlsym (handle_mod2, "single_threaded_2");
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TEST_VERIFY (__libc_single_threaded);
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TEST_VERIFY (single_threaded_1 ());
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/* The inner libc always assumes multi-threaded use. */
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TEST_VERIFY (!single_threaded_2 ());
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xdlclose (handle_mod2);
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return 0;
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}
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#include <support/test-driver.c>
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