sysdeps/generic/dl-dtv.h

   1 /* Generic declarations for DTV-based TLS handling in the dynamic linker.
   2    Copyright (C) 2002-2020 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 */