contrib/mpfr/mpfr-thread.h

   1 /* MPFR internal header related to thread-local variables.
   2
   3 Copyright 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   4 Contributed by the Arenaire and Cacao projects, INRIA.
   5
   6 This file is part of the GNU MPFR Library.
   7
   8 The GNU MPFR Library is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU Lesser General Public License as published by
  10 the Free Software Foundation; either version 2.1 of the License, or (at your
  11 option) any later version.
  12
  13 The GNU MPFR Library is distributed in the hope that it will be useful, but
  14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  16 License for more details.
  17
  18 You should have received a copy of the GNU Lesser General Public License
  19 along with the GNU MPFR Library; see the file COPYING.LIB.  If not, write to
  20 the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  21 MA 02110-1301, USA. */
  22
  23 #ifndef __MPFR_THREAD_H__
  24 #define __MPFR_THREAD_H__
  25
  26 /* Note: Let's define MPFR_THREAD_ATTR even after a #error to make the
  27    error message more visible (e.g. gcc doesn't immediately stop after
  28    the #error line and outputs many error messages if MPFR_THREAD_ATTR
  29    is not defined). But some compilers will just output a message and
  30    may build MPFR "successfully" (without thread support). */
  31 #ifndef MPFR_THREAD_ATTR
  32 # ifdef MPFR_USE_THREAD_SAFE
  33 #  if defined(_MSC_VER)
  34 #   if defined(_WINDLL)
  35 #    error "Can't build MPFR DLL as thread safe."
  36 #    define MPFR_THREAD_ATTR
  37 #   else
  38 #    define MPFR_THREAD_ATTR __declspec( thread )
  39 #   endif
  40 #  else
  41 #   define MPFR_THREAD_ATTR __thread
  42 #  endif
  43 # else
  44 #  define MPFR_THREAD_ATTR
  45 # endif
  46 #endif
  47
  48 #endif