1  /* Generic declarations for DTV-based TLS handling in the dynamic linker.
       2     Copyright (C) 2002-2023 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     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _DL_DTV_H
      20  #define _DL_DTV_H
      21  
      22  struct dtv_pointer
      23  {
      24    void *val;                    /* Pointer to data, or TLS_DTV_UNALLOCATED.  */
      25    void *to_free;                /* Unaligned pointer, for deallocation.  */
      26  };
      27  
      28  /* Type for the dtv.  */
      29  typedef union dtv
      30  {
      31    size_t counter;
      32    struct dtv_pointer pointer;
      33  } dtv_t;
      34  
      35  /* Value used for dtv entries for which the allocation is delayed.  */
      36  #define TLS_DTV_UNALLOCATED ((void *) -1l)
      37  
      38  #endif /* _DLT_DTV_H */