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539 lines
20 KiB
539 lines
20 KiB
![]()
11 years ago
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/*
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* Copyright 2008-2012 NVIDIA Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*! \file thrust/memory.h
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* \brief Abstractions for Thrust's memory model.
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*/
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#include <thrust/detail/config.h>
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#include <thrust/detail/type_traits/pointer_traits.h>
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#include <thrust/detail/pointer.h>
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#include <thrust/detail/reference.h>
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#include <thrust/detail/raw_pointer_cast.h>
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#include <thrust/detail/raw_reference_cast.h>
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#include <thrust/detail/malloc_and_free.h>
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#include <thrust/detail/temporary_buffer.h>
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namespace thrust
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{
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/*! \addtogroup memory_management Memory Management
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* \addtogroup memory_management_classes Memory Management Classes
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* \ingroup memory_management
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* \{
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*/
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/*! \p pointer stores a pointer to an object allocated in memory. Like \p device_ptr, this
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* type ensures type safety when dispatching standard algorithms on ranges resident in memory.
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*
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* \p pointer generalizes \p device_ptr by relaxing the backend system associated with the \p pointer.
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* Instead of the backend system specified by \p THRUST_DEFAULT_DEVICE_BACKEND, \p pointer's
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* system is given by its second template parameter, \p Tag. For the purpose of Thrust dispatch,
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* <tt>device_ptr<Element></tt> and <tt>pointer<Element,device_system_tag></tt> are considered equivalent.
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*
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* The raw pointer encapsulated by a \p pointer may be obtained through its <tt>get</tt> member function
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* or the \p raw_pointer_cast free function.
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*
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* \tparam Element specifies the type of the pointed-to object.
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*
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* \tparam Tag specifies the system with which this \p pointer is associated. This may be any Thrust
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* backend system, or a user-defined tag.
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*
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* \tparam Reference allows the client to specify the reference type returned upon derereference.
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* By default, this type is <tt>reference<Element,pointer></tt>.
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*
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* \tparam Derived allows the client to specify the name of the derived type when \p pointer is used as
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* a base class. This is useful to ensure that arithmetic on values of the derived type return
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* values of the derived type as a result. By default, this type is <tt>pointer<Element,Tag,Reference></tt>.
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*
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* \note \p pointer is not a smart pointer; it is the client's responsibility to deallocate memory
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* pointer to by \p pointer.
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*
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* \see device_ptr
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* \see reference
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* \see raw_pointer_cast
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*/
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// define pointer for the purpose of Doxygenating it
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// it is actually defined elsewhere
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#if 0
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template<typename Element, typename Tag, typename Reference = thrust::use_default, typename Derived = thrust::use_default>
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class pointer
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{
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public:
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/*! The type of the raw pointer
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*/
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typedef typename super_t::base_type raw_pointer;
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/*! \p pointer's default constructor initializes its encapsulated pointer to \c 0
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*/
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__host__ __device__
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pointer();
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/*! This constructor allows construction of a <tt>pointer<const T, ...></tt> from a <tt>T*</tt>.
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*
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* \param ptr A raw pointer to copy from, presumed to point to a location in \p Tag's memory.
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* \tparam OtherElement \p OtherElement shall be convertible to \p Element.
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*/
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template<typename OtherElement>
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__host__ __device__
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explicit pointer(OtherElement *ptr);
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/*! This contructor allows initialization from another pointer-like object.
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*
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* \param other The \p OtherPointer to copy.
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*
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* \tparam OtherPointer The tag associated with \p OtherPointer shall be convertible to \p Tag,
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* and its element type shall be convertible to \p Element.
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*/
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template<typename OtherPointer>
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__host__ __device__
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pointer(const OtherPointer &other,
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typename thrust::detail::enable_if_pointer_is_convertible<
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OtherPointer,
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pointer<Element,Tag,Reference,Derived>
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>::type * = 0);
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/*! Assignment operator allows assigning from another pointer-like object with related type.
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*
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* \param other The other pointer-like object to assign from.
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* \return <tt>*this</tt>
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*
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* \tparam OtherPointer The tag associated with \p OtherPointer shall be convertible to \p Tag,
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* and its element type shall be convertible to \p Element.
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*/
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template<typename OtherPointer>
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__host__ __device__
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typename thrust::detail::enable_if_pointer_is_convertible<
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OtherPointer,
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pointer,
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derived_type &
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>::type
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operator=(const OtherPointer &other);
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/*! \p get returns this \p pointer's encapsulated raw pointer.
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* \return This \p pointer's raw pointer.
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*/
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__host__ __device__
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Element *get() const;
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};
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#endif
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/*! \p reference is a wrapped reference to an object stored in memory. \p reference generalizes
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* \p device_reference by relaxing the type of pointer associated with the object. \p reference
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* is the type of the result of dereferencing a tagged pointer-like object such as \p pointer, and
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* intermediates operations on objects existing in a remote memory.
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*
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* \tparam Element specifies the type of the referent object.
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* \tparam Pointer specifies the type of the result of taking the address of \p reference.
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* \tparam Derived allows the client to specify the name of the derived type when \p reference is used as
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* a base class. This is useful to ensure that assignment to objects of the derived type return
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* values of the derived type as a result. By default, this type is <tt>reference<Element,Pointer></tt>.
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*/
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// define pointer for the purpose of Doxygenating it
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// it is actually defined elsewhere
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#if 0
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template<typename Element, typename Pointer, typename Derived = thrust::use_default>
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class reference
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{
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public:
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/*! The type of this \p reference's wrapped pointers.
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*/
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typedef Pointer pointer;
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/*! The \p value_type of this \p reference.
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*/
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typedef typename thrust::detail::remove_const<Element>::type value_type;
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/*! This copy constructor initializes this \p reference
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* to refer to an object pointed to by the given \p pointer. After
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* this \p reference is constructed, it shall refer to the
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* object pointed to by \p ptr.
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*
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* \param ptr A \p pointer to copy from.
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*/
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__host__ __device__
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explicit reference(const pointer &ptr);
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/*! This copy constructor accepts a const reference to another
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* \p reference of related type. After this \p reference is constructed,
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* it shall refer to the same object as \p other.
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*
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* \param other A \p reference to copy from.
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* \tparam OtherElement the element type of the other \p reference.
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* \tparam OtherPointer the pointer type of the other \p reference.
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* \tparam OtherDerived the derived type of the other \p reference.
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*
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* \note This constructor is templated primarily to allow initialization of
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* <tt>reference<const T,...></tt> from <tt>reference<T,...></tt>.
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*/
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template<typename OtherElement, typename OtherPointer, typename OtherDerived>
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__host__ __device__
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reference(const reference<OtherElement,OtherPointer,OtherDerived> &other,
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typename thrust::detail::enable_if_convertible<
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typename reference<OtherElement,OtherPointer,OtherDerived>::pointer,
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pointer
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>::type * = 0);
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/*! Copy assignment operator copy assigns from another \p reference.
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*
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* \param other The other \p reference to assign from.
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* \return <tt>static_cast<derived_type&>(*this)</tt>
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*/
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__host__ __device__
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derived_type &operator=(const reference &other);
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/*! Assignment operator copy assigns from another \p reference of related type.
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*
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* \param other The other \p reference to assign from.
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* \return <tt>static_cast<derived_type&>(*this)</tt>
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*
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* \tparam OtherElement the element type of the other \p reference.
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* \tparam OtherPointer the pointer type of the other \p reference.
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* \tparam OtherDerived the derived type of the other \p reference.
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*/
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template<typename OtherElement, typename OtherPointer, typename OtherDerived>
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__host__ __device__
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derived_type &operator=(const reference<OtherElement,OtherPointer,OtherDerived> &other);
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/*! Assignment operator assigns from a \p value_type.
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*
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* \param x The \p value_type to assign from.
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* \return <tt>static_cast<derived_type&>(*this)</tt>.
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*/
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__host__ __device__
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derived_type &operator=(const value_type &x);
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/*! Address-of operator returns a \p pointer pointing to the object
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* referenced by this \p reference. It does not return the address of this
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* \p reference.
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*
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* \return A \p pointer pointing to the referenct object.
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*/
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__host__ __device__
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pointer operator&() const;
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/*! Conversion operator converts this \p reference to \p value_type by
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* returning a copy of the referent object.
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*
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* \return A copy of the referent object.
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*/
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__host__ __device__
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operator value_type () const;
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/*! Swaps the value of the referent object with another.
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*
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* \param other The other \p reference with which to swap.
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* \note The argument is of type \p derived_type rather than \p reference.
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*/
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__host__ __device__
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void swap(derived_type &other);
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/*! Prefix increment operator increments the referent object.
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*
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* \return <tt>static_Cast<derived_type&>(*this)</tt>.
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*
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* \note Documentation for other arithmetic operators omitted for brevity.
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*/
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derived_type &operator++();
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};
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#endif
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/*! \}
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*/
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/*!
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* \addtogroup memory_management_functions Memory Management Functions
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* \ingroup memory_management
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* \{
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*/
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/*! \addtogroup allocation_functions
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* \{
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*/
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/*! This version of \p malloc allocates untyped uninitialized storage associated with a given system.
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*
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* \param system The Thrust system with which to associate the storage.
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* \param n The number of bytes of storage to allocate.
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* \return If allocation succeeds, a pointer to the allocated storage; a null pointer otherwise.
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* The pointer must be deallocated with \p thrust::free.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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*
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* \pre \p DerivedPolicy must be publically derived from <code>thrust::execution_policy<DerivedPolicy></code>.
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*
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* The following code snippet demonstrates how to use \p malloc to allocate a range of memory
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* associated with Thrust's device system.
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*
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* \code
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* #include <thrust/memory.h>
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* ...
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* // allocate some memory with thrust::malloc
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* const int N = 100;
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* thrust::device_system_tag device_sys;
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* thrust::pointer<void,thrust::device_space_tag> void_ptr = thrust::malloc(device_sys, N);
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*
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* // manipulate memory
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* ...
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*
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* // deallocate void_ptr with thrust::free
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* thrust::free(device_sys, void_ptr);
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* \endcode
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*
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* \see free
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* \see device_malloc
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*/
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template<typename DerivedPolicy>
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pointer<void,DerivedPolicy> malloc(const thrust::detail::execution_policy_base<DerivedPolicy> &system, std::size_t n);
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/*! This version of \p malloc allocates typed uninitialized storage associated with a given system.
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*
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* \param system The Thrust system with which to associate the storage.
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* \param n The number of elements of type \c T which the storage should accomodate.
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* \return If allocation succeeds, a pointer to an allocation large enough to accomodate \c n
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* elements of type \c T; a null pointer otherwise.
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* The pointer must be deallocated with \p thrust::free.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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*
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* \pre \p DerivedPolicy must be publically derived from <code>thrust::execution_policy<DerivedPolicy></code>.
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*
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* The following code snippet demonstrates how to use \p malloc to allocate a range of memory
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* to accomodate integers associated with Thrust's device system.
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*
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* \code
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* #include <thrust/memory.h>
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* ...
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* // allocate storage for 100 ints with thrust::malloc
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* const int N = 100;
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* thrust::device_system_tag device_sys;
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* thrust::pointer<int,thrust::device_system_tag> ptr = thrust::malloc<int>(device_sys, N);
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*
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* // manipulate memory
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* ...
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*
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* // deallocate ptr with thrust::free
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* thrust::free(device_sys, ptr);
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* \endcode
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*
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* \see free
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* \see device_malloc
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*/
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template<typename T, typename DerivedPolicy>
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pointer<T,DerivedPolicy> malloc(const thrust::detail::execution_policy_base<DerivedPolicy> &system, std::size_t n);
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/*! \p get_temporary_buffer returns a pointer to storage associated with a given Thrust system sufficient to store up to
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* \p n objects of type \c T. If not enough storage is available to accomodate \p n objects, an implementation may return
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* a smaller buffer. The number of objects the returned buffer can accomodate is also returned.
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*
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* Thrust uses \p get_temporary_buffer internally when allocating temporary storage required by algorithm implementations.
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*
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* The storage allocated with \p get_temporary_buffer must be returned to the system with \p return_temporary_buffer.
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*
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* \param system The Thrust system with which to associate the storage.
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* \param n The requested number of objects of type \c T the storage should accomodate.
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* \return A pair \c p such that <tt>p.first</tt> is a pointer to the allocated storage and <tt>p.second</tt> is the number of
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* contiguous objects of type \c T that the storage can accomodate. If no storage can be allocated, <tt>p.first</tt> if
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* no storage can be obtained. The storage must be returned to the system using \p return_temporary_buffer.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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*
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* \pre \p DerivedPolicy must be publically derived from <code>thrust::execution_policy<DerivedPolicy></code>.
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*
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* The following code snippet demonstrates how to use \p get_temporary_buffer to allocate a range of memory
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* to accomodate integers associated with Thrust's device system.
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*
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* \code
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* #include <thrust/memory.h>
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* ...
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* // allocate storage for 100 ints with thrust::get_temporary_buffer
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* const int N = 100;
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*
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* typedef thrust::pair<
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* thrust::pointer<int,thrust::device_system_tag>,
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* std::ptrdiff_t
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* > ptr_and_size_t;
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*
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* thrust::device_system_tag device_sys;
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* ptr_and_size_t ptr_and_size = thrust::get_temporary_buffer<int>(device_sys, N);
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*
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* // manipulate up to 100 ints
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* for(int i = 0; i < ptr_and_size.second; ++i)
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* {
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* *ptr_and_size.first = i;
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* }
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*
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* // deallocate storage with thrust::return_temporary_buffer
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* thrust::return_temporary_buffer(device_sys, ptr_and_size.first);
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* \endcode
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*
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* \see malloc
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* \see return_temporary_buffer
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*/
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template<typename T, typename DerivedPolicy>
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thrust::pair<thrust::pointer<T,DerivedPolicy>, typename thrust::pointer<T,DerivedPolicy>::difference_type>
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get_temporary_buffer(const thrust::detail::execution_policy_base<DerivedPolicy> &system, typename thrust::pointer<T,DerivedPolicy>::difference_type n);
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/*! \} allocation_functions
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*/
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/*! \addtogroup deallocation_functions
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||
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* \{
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*/
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/*! \p free deallocates the storage previously allocated by \p thrust::malloc.
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||
|
*
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* \param system The Thrust system with which the storage is associated.
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||
|
* \param ptr A pointer previously returned by \p thrust::malloc. If \p ptr is null, \p free
|
||
|
* does nothing.
|
||
|
*
|
||
|
* \tparam DerivedPolicy The name of the derived execution policy.
|
||
|
*
|
||
|
* \pre \p ptr shall have been returned by a previous call to <tt>thrust::malloc(system, n)</tt> or <tt>thrust::malloc<T>(system, n)</tt> for some type \c T.
|
||
|
*
|
||
|
* The following code snippet demonstrates how to use \p free to deallocate a range of memory
|
||
|
* previously allocated with \p thrust::malloc.
|
||
|
*
|
||
|
* \code
|
||
|
* #include <thrust/memory.h>
|
||
|
* ...
|
||
|
* // allocate storage for 100 ints with thrust::malloc
|
||
|
* const int N = 100;
|
||
|
* thrust::device_system_tag device_sys;
|
||
|
* thrust::pointer<int,thrust::device_system_tag> ptr = thrust::malloc<int>(device_sys, N);
|
||
|
*
|
||
|
* // mainpulate memory
|
||
|
* ...
|
||
|
*
|
||
|
* // deallocate ptr with thrust::free
|
||
|
* thrust::free(device_sys, ptr);
|
||
|
* \endcode
|
||
|
*/
|
||
|
template<typename DerivedPolicy, typename Pointer>
|
||
|
void free(const thrust::detail::execution_policy_base<DerivedPolicy> &system, Pointer ptr);
|
||
|
|
||
|
|
||
|
/*! \p return_temporary_buffer deallocates storage associated with a given Thrust system previously allocated by \p get_temporary_buffer.
|
||
|
*
|
||
|
* Thrust uses \p return_temporary_buffer internally when deallocating temporary storage required by algorithm implementations.
|
||
|
*
|
||
|
* \param system The Thrust system with which the storage is associated.
|
||
|
* \param p A pointer previously returned by \p thrust::get_temporary_buffer. If \p ptr is null, \p return_temporary_buffer does nothing.
|
||
|
*
|
||
|
* \tparam DerivedPolicy The name of the derived execution policy.
|
||
|
*
|
||
|
* \pre \p p shall have been previously allocated by \p thrust::get_temporary_buffer.
|
||
|
*
|
||
|
* The following code snippet demonstrates how to use \p return_temporary_buffer to deallocate a range of memory
|
||
|
* previously allocated by \p get_temporary_buffer.
|
||
|
*
|
||
|
* \code
|
||
|
* #include <thrust/memory.h>
|
||
|
* ...
|
||
|
* // allocate storage for 100 ints with thrust::get_temporary_buffer
|
||
|
* const int N = 100;
|
||
|
*
|
||
|
* typedef thrust::pair<
|
||
|
* thrust::pointer<int,thrust::device_system_tag>,
|
||
|
* std::ptrdiff_t
|
||
|
* > ptr_and_size_t;
|
||
|
*
|
||
|
* thrust::device_system_tag device_sys;
|
||
|
* ptr_and_size_t ptr_and_size = thrust::get_temporary_buffer<int>(device_sys, N);
|
||
|
*
|
||
|
* // manipulate up to 100 ints
|
||
|
* for(int i = 0; i < ptr_and_size.second; ++i)
|
||
|
* {
|
||
|
* *ptr_and_size.first = i;
|
||
|
* }
|
||
|
*
|
||
|
* // deallocate storage with thrust::return_temporary_buffer
|
||
|
* thrust::return_temporary_buffer(device_sys, ptr_and_size.first);
|
||
|
* \endcode
|
||
|
*
|
||
|
* \see free
|
||
|
* \see get_temporary_buffer
|
||
|
*/
|
||
|
template<typename DerivedPolicy, typename Pointer>
|
||
|
void return_temporary_buffer(const thrust::detail::execution_policy_base<DerivedPolicy> &system, Pointer p);
|
||
|
|
||
|
|
||
|
/*! \} deallocation_functions
|
||
|
*/
|
||
|
|
||
|
|
||
|
/*! \p raw_pointer_cast creates a "raw" pointer from a pointer-like type,
|
||
|
* simply returning the wrapped pointer, should it exist.
|
||
|
*
|
||
|
* \param ptr The pointer of interest.
|
||
|
* \return <tt>ptr.get()</tt>, if the expression is well formed; <tt>ptr</tt>, otherwise.
|
||
|
* \see raw_reference_cast
|
||
|
*/
|
||
|
template<typename Pointer>
|
||
|
__host__ __device__
|
||
|
inline typename thrust::detail::pointer_traits<Pointer>::raw_pointer
|
||
|
raw_pointer_cast(const Pointer &ptr);
|
||
|
|
||
|
|
||
|
/*! \p raw_reference_cast creates a "raw" reference from a wrapped reference type,
|
||
|
* simply returning the underlying reference, should it exist.
|
||
|
*
|
||
|
* If the argument is not a reference wrapper, the result is a reference to the argument.
|
||
|
*
|
||
|
* \param ref The reference of interest.
|
||
|
* \return <tt>*thrust::raw_pointer_cast(&ref)</tt>.
|
||
|
* \note There are two versions of \p raw_reference_cast. One for <tt>const</tt> references,
|
||
|
* and one for non-<tt>const</tt>.
|
||
|
* \see raw_pointer_cast
|
||
|
*/
|
||
|
template<typename T>
|
||
|
__host__ __device__
|
||
|
inline typename detail::raw_reference<T>::type
|
||
|
raw_reference_cast(T &ref);
|
||
|
|
||
|
|
||
|
/*! \p raw_reference_cast creates a "raw" reference from a wrapped reference type,
|
||
|
* simply returning the underlying reference, should it exist.
|
||
|
*
|
||
|
* If the argument is not a reference wrapper, the result is a reference to the argument.
|
||
|
*
|
||
|
* \param ref The reference of interest.
|
||
|
* \return <tt>*thrust::raw_pointer_cast(&ref)</tt>.
|
||
|
* \note There are two versions of \p raw_reference_cast. One for <tt>const</tt> references,
|
||
|
* and one for non-<tt>const</tt>.
|
||
|
* \see raw_pointer_cast
|
||
|
*/
|
||
|
template<typename T>
|
||
|
__host__ __device__
|
||
|
inline typename detail::raw_reference<const T>::type
|
||
|
raw_reference_cast(const T &ref);
|
||
|
|
||
|
|
||
|
/*! \}
|
||
|
*/
|
||
|
|
||
|
} // end thrust
|
||
|
|