cache_aligned_allocator.h Source File

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# cache_aligned_allocator.h

    00001 /*
    00002     Copyright 2005-2010 Intel Corporation.  All Rights Reserved.
    00003
    00004     The source code contained or described herein and all documents related
    00005     to the source code ("Material") are owned by Intel Corporation or its
    00006     suppliers or licensors.  Title to the Material remains with Intel
    00007     Corporation or its suppliers and licensors.  The Material is protected
    00008     by worldwide copyright laws and treaty provisions.  No part of the
    00009     Material may be used, copied, reproduced, modified, published, uploaded,
    00010     posted, transmitted, distributed, or disclosed in any way without
    00011     Intel's prior express written permission.
    00012
    00013     No license under any patent, copyright, trade secret or other
    00014     intellectual property right is granted to or conferred upon you by
    00015     disclosure or delivery of the Materials, either expressly, by
    00016     implication, inducement, estoppel or otherwise.  Any license under such
    00017     intellectual property rights must be express and approved by Intel in
    00018     writing.
    00019 */
    00020
    00021 #ifndef __TBB_cache_aligned_allocator_H
    00022 #define __TBB_cache_aligned_allocator_H
    00023
    00024 #include <new>
    00025 #include "tbb_stddef.h"
    00026
    00027 namespace tbb {
    00028
    00030 namespace internal {
    00032
    00033     size_t __TBB_EXPORTED_FUNC NFS_GetLineSize();
    00034
    00036
    00037     void* __TBB_EXPORTED_FUNC NFS_Allocate( size_t n_element, size_t element_size, void* hint );
    00038
    00040
    00042     void __TBB_EXPORTED_FUNC NFS_Free( void* );
    00043 }
    00045
    00046 #if _MSC_VER && !defined(__INTEL_COMPILER)
    00047     // Workaround for erroneous "unreferenced parameter" warning in method destroy.
    00048     #pragma warning (push)
    00049     #pragma warning (disable: 4100)
    00050 #endif
    00051
    00053
    00056 template<typename T>
    00057 class cache_aligned_allocator {
    00058 public:
    00059     typedef typename internal::allocator_type<T>::value_type value_type;
    00060     typedef value_type* pointer;
    00061     typedef const value_type* const_pointer;
    00062     typedef value_type& reference;
    00063     typedef const value_type& const_reference;
    00064     typedef size_t size_type;
    00065     typedef ptrdiff_t difference_type;
    00066     template<typename U> struct rebind {
    00067         typedef cache_aligned_allocator<U> other;
    00068     };
    00069
    00070     cache_aligned_allocator() throw() {}
    00071     cache_aligned_allocator( const cache_aligned_allocator& ) throw() {}
    00072     template<typename U> cache_aligned_allocator(const cache_aligned_allocator<U>&) throw() {}
    00073
    00074     pointer address(reference x) const {return &x;}
    00075     const_pointer address(const_reference x) const {return &x;}
    00076
    00078     pointer allocate( size_type n, const void* hint=0 ) {
    00079         // The "hint" argument is always ignored in NFS_Allocate thus const_cast shouldn't hurt
    00080         return pointer(internal::NFS_Allocate( n, sizeof(value_type), const_cast<void*>(hint) ));
    00081     }
    00082
    00084     void deallocate( pointer p, size_type ) {
    00085         internal::NFS_Free(p);
    00086     }
    00087
    00089     size_type max_size() const throw() {
    00090         return (~size_t(0)-internal::NFS_MaxLineSize)/sizeof(value_type);
    00091     }
    00092
    00094     void construct( pointer p, const value_type& value ) {::new((void*)(p)) value_type(value);}
    00095
    00097     void destroy( pointer p ) {p->~value_type();}
    00098 };
    00099
    00100 #if _MSC_VER && !defined(__INTEL_COMPILER)
    00101     #pragma warning (pop)
    00102 #endif // warning 4100 is back
    00103
    00105
    00106 template<>
    00107 class cache_aligned_allocator<void> {
    00108 public:
    00109     typedef void* pointer;
    00110     typedef const void* const_pointer;
    00111     typedef void value_type;
    00112     template<typename U> struct rebind {
    00113         typedef cache_aligned_allocator<U> other;
    00114     };
    00115 };
    00116
    00117 template<typename T, typename U>
    00118 inline bool operator==( const cache_aligned_allocator<T>&, const cache_aligned_allocator<U>& ) {return true;}
    00119
    00120 template<typename T, typename U>
    00121 inline bool operator!=( const cache_aligned_allocator<T>&, const cache_aligned_allocator<U>& ) {return false;}
    00122
    00123 } // namespace tbb
    00124
    00125 #endif /* __TBB_cache_aligned_allocator_H */

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