Blame nptl/libc_multiple_threads.c

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/* Copyright (C) 2002-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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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   <http://www.gnu.org/licenses/>.  */
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#include <pthreadP.h>
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#if IS_IN (libc)
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# ifndef TLS_MULTIPLE_THREADS_IN_TCB
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/* Variable set to a nonzero value either if more than one thread runs or ran,
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   or if a single-threaded process is trying to cancel itself.  See
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   nptl/descr.h for more context on the single-threaded process case.  */
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int __libc_multiple_threads attribute_hidden;
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# endif
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#endif