Chris@16: //  Copyright (C) 2009 Tim Blechmann
Chris@16: //
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See
Chris@16: //  accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_LOCKFREE_PREFIX_HPP_INCLUDED
Chris@16: #define BOOST_LOCKFREE_PREFIX_HPP_INCLUDED
Chris@16: 
Chris@16: /* this file defines the following macros:
Chris@16:    BOOST_LOCKFREE_CACHELINE_BYTES: size of a cache line
Chris@16:    BOOST_LOCKFREE_PTR_COMPRESSION: use tag/pointer compression to utilize parts
Chris@16:                                    of the virtual address space as tag (at least 16bit)
Chris@16:    BOOST_LOCKFREE_DCAS_ALIGNMENT:  symbol used for aligning structs at cache line
Chris@16:                                    boundaries
Chris@16: */
Chris@16: 
Chris@16: #define BOOST_LOCKFREE_CACHELINE_BYTES 64
Chris@16: 
Chris@16: #ifdef _MSC_VER
Chris@16: 
Chris@16: #define BOOST_LOCKFREE_CACHELINE_ALIGNMENT __declspec(align(BOOST_LOCKFREE_CACHELINE_BYTES))
Chris@16: 
Chris@16: #if defined(_M_IX86)
Chris@16:     #define BOOST_LOCKFREE_DCAS_ALIGNMENT
Chris@16: #elif defined(_M_X64) || defined(_M_IA64)
Chris@16:     #define BOOST_LOCKFREE_PTR_COMPRESSION 1
Chris@16:     #define BOOST_LOCKFREE_DCAS_ALIGNMENT __declspec(align(16))
Chris@16: #endif
Chris@16: 
Chris@16: #endif /* _MSC_VER */
Chris@16: 
Chris@16: #ifdef __GNUC__
Chris@16: 
Chris@16: #define BOOST_LOCKFREE_CACHELINE_ALIGNMENT __attribute__((aligned(BOOST_LOCKFREE_CACHELINE_BYTES)))
Chris@16: 
Chris@16: #if defined(__i386__) || defined(__ppc__)
Chris@16:     #define BOOST_LOCKFREE_DCAS_ALIGNMENT
Chris@16: #elif defined(__x86_64__)
Chris@16:     #define BOOST_LOCKFREE_PTR_COMPRESSION 1
Chris@16:     #define BOOST_LOCKFREE_DCAS_ALIGNMENT __attribute__((aligned(16)))
Chris@16: #elif defined(__alpha__)
Chris@16:     // LATER: alpha may benefit from pointer compression. but what is the maximum size of the address space?
Chris@16:     #define BOOST_LOCKFREE_DCAS_ALIGNMENT
Chris@16: #endif
Chris@16: #endif /* __GNUC__ */
Chris@16: 
Chris@16: #ifndef BOOST_LOCKFREE_DCAS_ALIGNMENT
Chris@16: #define BOOST_LOCKFREE_DCAS_ALIGNMENT /*BOOST_LOCKFREE_DCAS_ALIGNMENT*/
Chris@16: #endif
Chris@16: 
Chris@16: #ifndef BOOST_LOCKFREE_CACHELINE_ALIGNMENT
Chris@16: #define BOOST_LOCKFREE_CACHELINE_ALIGNMENT /*BOOST_LOCKFREE_CACHELINE_ALIGNMENT*/
Chris@16: #endif
Chris@16: 
Chris@16: #endif /* BOOST_LOCKFREE_PREFIX_HPP_INCLUDED */