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View File Name : struct_rwlock.h

/* x86 internal rwlock struct definitions.
   Copyright (C) 2019-2022 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _RWLOCK_INTERNAL_H
#define _RWLOCK_INTERNAL_H

struct __pthread_rwlock_arch_t
{
  unsigned int __readers;
  unsigned int __writers;
  unsigned int __wrphase_futex;
  unsigned int __writers_futex;
  unsigned int __pad3;
  unsigned int __pad4;
#ifdef __x86_64__
  int __cur_writer;
  int __shared;
  signed char __rwelision;
# ifdef  __ILP32__
  unsigned char __pad1[3];
#  define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0 }
# else
  unsigned char __pad1[7];
#  define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0, 0, 0, 0, 0 }
# endif
  unsigned long int __pad2;
  /* FLAGS must stay at this position in the structure to maintain
     binary compatibility.  */
  unsigned int __flags;
#else /* __x86_64__  */
  /* FLAGS must stay at this position in the structure to maintain
     binary compatibility.  */
  unsigned char __flags;
  unsigned char __shared;
  signed char __rwelision;
  unsigned char __pad2;
  int __cur_writer;
#endif
};

#ifdef __x86_64__
# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
  0, 0, 0, 0, 0, 0, 0, 0, __PTHREAD_RWLOCK_ELISION_EXTRA, 0, __flags
#else
# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
  0, 0, 0, 0, 0, 0, __flags, 0, 0, 0, 0
#endif

#endif