elf/dl-tsd.c

   1 /* Thread-local data used by error handling for runtime dynamic linker.
   2    Copyright (C) 2002, 2005, 2011 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifdef _LIBC_REENTRANT
  21
  22 # include <ldsodefs.h>
  23 # include <tls.h>
  24
  25 # ifndef SHARED
  26
  27 /* _dl_error_catch_tsd points to this for the single-threaded case.
  28    It's reset by the thread library for multithreaded programs
  29    if we're not using __thread.  */
  30 void ** __attribute__ ((const))
  31 _dl_initial_error_catch_tsd (void)
  32 {
  33   static __thread void *data;
  34   return &data;
  35 }
  36 void **(*_dl_error_catch_tsd) (void) __attribute__ ((const))
  37      = &_dl_initial_error_catch_tsd;
  38
  39 # else
  40
  41 /* libpthread sets _dl_error_catch_tsd to point to this function.
  42    We define it here instead of in libpthread so that it doesn't
  43    need to have a TLS segment of its own just for this one pointer.  */
  44
  45 void ** __attribute__ ((const))
  46 __libc_dl_error_tsd (void)
  47 {
  48   static __thread void *data attribute_tls_model_ie;
  49   return &data;
  50 }
  51
  52 # endif /* SHARED */
  53
  54 #endif /* _LIBC_REENTRANT */