The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/struct_rwlock.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/struct_rwlock.h

     1	/* x86 internal rwlock struct definitions.
     2	   Copyright (C) 2019-2024 Free Software Foundation, Inc.
     3	
     4	   This file is part of the GNU C Library.
     5	
     6	   The GNU C Library is free software; you can redistribute it and/or
     7	   modify it under the terms of the GNU Lesser General Public
     8	   License as published by the Free Software Foundation; either
     9	   version 2.1 of the License, or (at your option) any later version.
    10	
    11	   The GNU C Library is distributed in the hope that it will be useful,
    12	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    13	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    14	   Lesser General Public License for more details.
    15	
    16	   You should have received a copy of the GNU Lesser General Public
    17	   License along with the GNU C Library; if not, see
    18	   <http://www.gnu.org/licenses/>.  */
    19	
    20	#ifndef _RWLOCK_INTERNAL_H
    21	#define _RWLOCK_INTERNAL_H
    22	
    23	struct __pthread_rwlock_arch_t
    24	{
    25	  unsigned int __readers;
    26	  unsigned int __writers;
    27	  unsigned int __wrphase_futex;
    28	  unsigned int __writers_futex;
    29	  unsigned int __pad3;
    30	  unsigned int __pad4;
    31	#ifdef __x86_64__
    32	  int __cur_writer;
    33	  int __shared;
    34	  signed char __rwelision;
    35	# ifdef  __ILP32__
    36	  unsigned char __pad1[3];
    37	#  define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0 }
    38	# else
    39	  unsigned char __pad1[7];
    40	#  define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0, 0, 0, 0, 0 }
    41	# endif
    42	  unsigned long int __pad2;
    43	  /* FLAGS must stay at this position in the structure to maintain
    44	     binary compatibility.  */
    45	  unsigned int __flags;
    46	#else /* __x86_64__  */
    47	  /* FLAGS must stay at this position in the structure to maintain
    48	     binary compatibility.  */
    49	  unsigned char __flags;
    50	  unsigned char __shared;
    51	  signed char __rwelision;
    52	  unsigned char __pad2;
    53	  int __cur_writer;
    54	#endif
    55	};
    56	
    57	#ifdef __x86_64__
    58	# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
    59	  0, 0, 0, 0, 0, 0, 0, 0, __PTHREAD_RWLOCK_ELISION_EXTRA, 0, __flags
    60	#else
    61	# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
    62	  0, 0, 0, 0, 0, 0, __flags, 0, 0, 0, 0
    63	#endif
    64	
    65	#endif