1/* Support for single-thread optimizations.
2 Copyright (C) 2020-2026 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// zig patch: sys/single_threaded.h header was added in glibc 2.32
20#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 32
21 #error "sys/single_threaded.h did not exist before glibc 2.32"
22#endif /* error for glibc before 2.32 */
23
24#ifndef _SYS_SINGLE_THREADED_H
25#define _SYS_SINGLE_THREADED_H
26
27#include <features.h>
28
29__BEGIN_DECLS
30
31/* If this variable is non-zero, then the current thread is the only
32 thread in the process image. If it is zero, the process might be
33 multi-threaded. */
34extern char __libc_single_threaded;
35
36__END_DECLS
37
38#endif /* _SYS_SINGLE_THREADED_H */