1 /* Support for single-thread optimizations.
2    Copyright (C) 2020-2022 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.  */
29 extern char __libc_single_threaded;
30 
31 __END_DECLS
32 
33 #endif /* _SYS_SINGLE_THREADED_H */
34