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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/sys/single_threaded.h


$ cat -n /usr/include/x86_64-linux-gnu/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 */