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/* Support for single-thread optimizations.
Copyright (C) 2020-2021 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/>. */
#ifndef _SYS_SINGLE_THREADED_H
#define _SYS_SINGLE_THREADED_H
#include <features.h>
__BEGIN_DECLS
/* If this variable is non-zero, then the current thread is the only
thread in the process image. If it is zero, the process might be
multi-threaded. */
extern char __libc_single_threaded;
__END_DECLS
#endif /* _SYS_SINGLE_THREADED_H */
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