external_libraries/boost-lockfree/boost/lockfree/detail/prefix.hpp

   1 //  Copyright (C) 2009 Tim Blechmann
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0. (See
   4 //  accompanying file LICENSE_1_0.txt or copy at
   5 //  http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #ifndef BOOST_LOCKFREE_PREFIX_HPP_INCLUDED
   8 #define BOOST_LOCKFREE_PREFIX_HPP_INCLUDED
   9
  10 /* this file defines the following macros:
  11    BOOST_LOCKFREE_CACHELINE_BYTES: size of a cache line
  12    BOOST_LOCKFREE_PTR_COMPRESSION: use tag/pointer compression to utilize parts
  13                                    of the virtual address space as tag (at least 16bit)
  14    BOOST_LOCKFREE_DCAS_ALIGNMENT:  symbol used for aligning structs at cache line
  15                                    boundaries
  16 */
  17
  18 #define BOOST_LOCKFREE_CACHELINE_BYTES 64
  19
  20 #ifdef _MSC_VER
  21
  22 #define BOOST_LOCKFREE_CACHELINE_ALIGNMENT __declspec(align(BOOST_LOCKFREE_CACHELINE_BYTES))
  23
  24 #if defined(_M_IX86)
  25     #define BOOST_LOCKFREE_DCAS_ALIGNMENT
  26 #elif defined(_M_X64) || defined(_M_IA64)
  27     #define BOOST_LOCKFREE_PTR_COMPRESSION 1
  28     #define BOOST_LOCKFREE_DCAS_ALIGNMENT __declspec(align(16))
  29 #endif
  30
  31 #endif /* _MSC_VER */
  32
  33 #ifdef __GNUC__
  34
  35 #define BOOST_LOCKFREE_CACHELINE_ALIGNMENT __attribute__((aligned(BOOST_LOCKFREE_CACHELINE_BYTES)))
  36
  37 #if defined(__i386__) || defined(__ppc__)
  38     #define BOOST_LOCKFREE_DCAS_ALIGNMENT
  39 #elif defined(__x86_64__)
  40     #define BOOST_LOCKFREE_PTR_COMPRESSION 1
  41     #define BOOST_LOCKFREE_DCAS_ALIGNMENT __attribute__((aligned(16)))
  42 #elif defined(__alpha__)
  43     // LATER: alpha may benefit from pointer compression. but what is the maximum size of the address space?
  44     #define BOOST_LOCKFREE_DCAS_ALIGNMENT
  45 #endif
  46 #endif /* __GNUC__ */
  47
  48 #ifndef BOOST_LOCKFREE_DCAS_ALIGNMENT
  49 #define BOOST_LOCKFREE_DCAS_ALIGNMENT /*BOOST_LOCKFREE_DCAS_ALIGNMENT*/
  50 #endif
  51
  52 #ifndef BOOST_LOCKFREE_CACHELINE_ALIGNMENT
  53 #define BOOST_LOCKFREE_CACHELINE_ALIGNMENT /*BOOST_LOCKFREE_CACHELINE_ALIGNMENT*/
  54 #endif
  55
  56 #endif /* BOOST_LOCKFREE_PREFIX_HPP_INCLUDED */