sysdeps/sparc/nptl/bits/struct_rwlock.h

   1 /* SPARC internal rwlock struct definitions.
   2    Copyright (C) 2019-2020 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 #if __WORDSIZE == 64
  32   int __cur_writer;
  33   int __shared;
  34   unsigned long int __pad1;
  35   unsigned long int __pad2;
  36   /* FLAGS must stay at this position in the structure to maintain
  37      binary compatibility.  */
  38   unsigned int __flags;
  39 #else
  40   unsigned char __pad1;
  41   unsigned char __pad2;
  42   unsigned char __shared;
  43   /* FLAGS must stay at this position in the structure to maintain
  44      binary compatibility.  */
  45   unsigned char __flags;
  46   int __cur_writer;
  47 #endif
  48 };
  49
  50 #if __WORDSIZE == 64
  51 # define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
  52   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, __flags
  53 #else
  54 # define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
  55   0, 0, 0, 0, 0, 0, 0, 0, 0, __flags, 0
  56 #endif
  57
  58 #endif