1  /* Basic platform-independent macro definitions for mutexes,
       2     thread-specific data and parameters for malloc.
       3     Copyright (C) 2003-2023 Free Software Foundation, Inc.
       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     <https://www.gnu.org/licenses/>.  */
      19  
      20  #ifndef _GENERIC_MALLOC_MACHINE_H
      21  #define _GENERIC_MALLOC_MACHINE_H
      22  
      23  #include <atomic.h>
      24  
      25  #ifndef atomic_full_barrier
      26  # define atomic_full_barrier() __asm ("" ::: "memory")
      27  #endif
      28  
      29  #ifndef atomic_read_barrier
      30  # define atomic_read_barrier() atomic_full_barrier ()
      31  #endif
      32  
      33  #ifndef atomic_write_barrier
      34  # define atomic_write_barrier() atomic_full_barrier ()
      35  #endif
      36  
      37  #ifndef DEFAULT_TOP_PAD
      38  # define DEFAULT_TOP_PAD 131072
      39  #endif
      40  
      41  #endif /* !defined(_GENERIC_MALLOC_MACHINE_H) */