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47 lines
1.8 KiB
C
47 lines
1.8 KiB
C
/* Verify that TLS access in separate thread in a dlopened library does not
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deadlock.
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Copyright (C) 2015-2020 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 <dlfcn.h>
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/* When one dynamically loads a module, which spawns a thread to perform some
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activities, it could be possible that TLS storage is accessed for the first
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time in that thread. This results in an allocation request within the
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thread, which could result in an attempt to take the rtld load_lock. This
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is a problem because it would then deadlock with the dlopen (which owns the
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lock), if the main thread is waiting for the spawned thread to exit. We can
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at least ensure that this problem does not occur due to accesses within
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libc.so, by marking TLS variables within libc.so as IE. The problem of an
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arbitrary variable being accessed and constructed within such a thread still
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exists but this test case does not verify that. */
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int
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do_test (void)
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{
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void *f = dlopen ("tst-join7mod.so", RTLD_NOW | RTLD_GLOBAL);
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if (f)
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dlclose (f);
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else
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return 1;
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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