1/* Support for single-thread optimizations.
2 Copyright (C) 2020-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _SYS_SINGLE_THREADED_H
20#define _SYS_SINGLE_THREADED_H
21
22#include <features.h>
23
24__BEGIN_DECLS
25
26/* If this variable is non-zero, then the current thread is the only
27 thread in the process image. If it is zero, the process might be
28 multi-threaded. */
29extern char __libc_single_threaded;
30
31__END_DECLS
32
33#endif /* _SYS_SINGLE_THREADED_H */
34