misc/sys/single_threaded.h

   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.  */
  29 extern char __libc_single_threaded;
  30
  31 __END_DECLS
  32
  33 #endif /* _SYS_SINGLE_THREADED_H */