sysdeps/hppa/nptl/bits/struct_mutex.h

   1 /* HPPA internal mutex struct definitions.
   2    Copyright (C) 2019-2023 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _THREAD_MUTEX_INTERNAL_H
  20 #define _THREAD_MUTEX_INTERNAL_H 1
  21
  22 struct __pthread_mutex_s
  23 {
  24   int __lock __LOCK_ALIGNMENT;
  25   unsigned int __count;
  26   int __owner;
  27   /* KIND must stay at this position in the structure to maintain
  28      binary compatibility with static initializers.  */
  29   int __kind;
  30   /* The old 4-word 16-byte aligned lock. This is initalized
  31      to all ones by the Linuxthreads PTHREAD_MUTEX_INITIALIZER.
  32      Unused in NPTL.  */
  33   int __glibc_compat_padding[4];
  34   /* In the old structure there are 4 words left due to alignment.
  35      In NPTL two words are used.  */
  36   unsigned int __nusers;
  37   __extension__ union
  38   {
  39     int __spins;
  40     __pthread_slist_t __list;
  41   };
  42   /* Two more words are left before the NPTL
  43      pthread_mutex_t is larger than Linuxthreads.  */
  44   int __glibc_reserved1;
  45   int __glibc_reserved2;
  46 };
  47
  48 #define __PTHREAD_MUTEX_HAVE_PREV       0
  49
  50 #define __PTHREAD_MUTEX_INITIALIZER(__kind) \
  51   0, 0, 0, __kind, { 0, 0, 0, 0 }, 0, { 0 }, 0, 0
  52
  53 #endif