| /* |
| Copyright 2005-2010 Intel Corporation. All Rights Reserved. |
| |
| This file is part of Threading Building Blocks. |
| |
| Threading Building Blocks is free software; you can redistribute it |
| and/or modify it under the terms of the GNU General Public License |
| version 2 as published by the Free Software Foundation. |
| |
| Threading Building Blocks is distributed in the hope that it will be |
| useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
| of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with Threading Building Blocks; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| As a special exception, you may use this file as part of a free software |
| library without restriction. Specifically, if other files instantiate |
| templates or use macros or inline functions from this file, or you compile |
| this file and link it with other files to produce an executable, this |
| file does not by itself cause the resulting executable to be covered by |
| the GNU General Public License. This exception does not however |
| invalidate any other reasons why the executable file might be covered by |
| the GNU General Public License. |
| */ |
| |
| #ifndef __TBB_cache_aligned_allocator_H |
| #define __TBB_cache_aligned_allocator_H |
| |
| #include <new> |
| #include "tbb_stddef.h" |
| |
| namespace tbb { |
| |
| //! @cond INTERNAL |
| namespace internal { |
| //! Cache/sector line size. |
| /** @ingroup memory_allocation */ |
| size_t __TBB_EXPORTED_FUNC NFS_GetLineSize(); |
| |
| //! Allocate memory on cache/sector line boundary. |
| /** @ingroup memory_allocation */ |
| void* __TBB_EXPORTED_FUNC NFS_Allocate( size_t n_element, size_t element_size, void* hint ); |
| |
| //! Free memory allocated by NFS_Allocate. |
| /** Freeing a NULL pointer is allowed, but has no effect. |
| @ingroup memory_allocation */ |
| void __TBB_EXPORTED_FUNC NFS_Free( void* ); |
| } |
| //! @endcond |
| |
| #if _MSC_VER && !defined(__INTEL_COMPILER) |
| // Workaround for erroneous "unreferenced parameter" warning in method destroy. |
| #pragma warning (push) |
| #pragma warning (disable: 4100) |
| #endif |
| |
| //! Meets "allocator" requirements of ISO C++ Standard, Section 20.1.5 |
| /** The members are ordered the same way they are in section 20.4.1 |
| of the ISO C++ standard. |
| @ingroup memory_allocation */ |
| template<typename T> |
| class cache_aligned_allocator { |
| public: |
| typedef typename internal::allocator_type<T>::value_type value_type; |
| typedef value_type* pointer; |
| typedef const value_type* const_pointer; |
| typedef value_type& reference; |
| typedef const value_type& const_reference; |
| typedef size_t size_type; |
| typedef ptrdiff_t difference_type; |
| template<typename U> struct rebind { |
| typedef cache_aligned_allocator<U> other; |
| }; |
| |
| cache_aligned_allocator() noexcept {} |
| cache_aligned_allocator( const cache_aligned_allocator& ) noexcept {} |
| template<typename U> cache_aligned_allocator(const cache_aligned_allocator<U>&) noexcept {} |
| |
| pointer address(reference x) const {return &x;} |
| const_pointer address(const_reference x) const {return &x;} |
| |
| //! Allocate space for n objects, starting on a cache/sector line. |
| pointer allocate( size_type n, const void* hint=0 ) { |
| // The "hint" argument is always ignored in NFS_Allocate thus const_cast shouldn't hurt |
| return pointer(internal::NFS_Allocate( n, sizeof(value_type), const_cast<void*>(hint) )); |
| } |
| |
| //! Free block of memory that starts on a cache line |
| void deallocate( pointer p, size_type ) { |
| internal::NFS_Free(p); |
| } |
| |
| //! Largest value for which method allocate might succeed. |
| size_type max_size() const noexcept { |
| return (~size_t(0)-internal::NFS_MaxLineSize)/sizeof(value_type); |
| } |
| |
| //! Copy-construct value at location pointed to by p. |
| void construct( pointer p, const value_type& value ) {::new((void*)(p)) value_type(value);} |
| |
| //! Destroy value at location pointed to by p. |
| void destroy( pointer p ) {p->~value_type();} |
| }; |
| |
| #if _MSC_VER && !defined(__INTEL_COMPILER) |
| #pragma warning (pop) |
| #endif // warning 4100 is back |
| |
| //! Analogous to std::allocator<void>, as defined in ISO C++ Standard, Section 20.4.1 |
| /** @ingroup memory_allocation */ |
| template<> |
| class cache_aligned_allocator<void> { |
| public: |
| typedef void* pointer; |
| typedef const void* const_pointer; |
| typedef void value_type; |
| template<typename U> struct rebind { |
| typedef cache_aligned_allocator<U> other; |
| }; |
| }; |
| |
| template<typename T, typename U> |
| inline bool operator==( const cache_aligned_allocator<T>&, const cache_aligned_allocator<U>& ) {return true;} |
| |
| template<typename T, typename U> |
| inline bool operator!=( const cache_aligned_allocator<T>&, const cache_aligned_allocator<U>& ) {return false;} |
| |
| } // namespace tbb |
| |
| #endif /* __TBB_cache_aligned_allocator_H */ |