| /////////////////////////////////////////////////////////////////////////////// |
| // |
| // (C) Copyright Ion Gaztanaga 2005-2009. Distributed under the Boost |
| // Software License, Version 1.0. (See accompanying file |
| // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| // See http://www.boost.org/libs/interprocess for documentation. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #ifndef BOOST_INTERPROCESS_ALLOCATOR_HPP |
| #define BOOST_INTERPROCESS_ALLOCATOR_HPP |
| |
| #if (defined _MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif |
| |
| #include <boost/interprocess/detail/config_begin.hpp> |
| #include <boost/interprocess/detail/workaround.hpp> |
| |
| #include <boost/pointer_to_other.hpp> |
| |
| #include <boost/interprocess/interprocess_fwd.hpp> |
| #include <boost/interprocess/containers/allocation_type.hpp> |
| #include <boost/interprocess/containers/container/detail/multiallocation_chain.hpp> |
| #include <boost/interprocess/allocators/detail/allocator_common.hpp> |
| #include <boost/interprocess/detail/utilities.hpp> |
| #include <boost/interprocess/containers/version_type.hpp> |
| #include <boost/interprocess/exceptions.hpp> |
| #include <boost/assert.hpp> |
| #include <boost/utility/addressof.hpp> |
| #include <boost/interprocess/detail/type_traits.hpp> |
| |
| #include <memory> |
| #include <algorithm> |
| #include <cstddef> |
| #include <stdexcept> |
| |
| //!\file |
| //!Describes an allocator that allocates portions of fixed size |
| //!memory buffer (shared memory, mapped file...) |
| |
| namespace boost { |
| namespace interprocess { |
| |
| |
| //!An STL compatible allocator that uses a segment manager as |
| //!memory source. The internal pointer type will of the same type (raw, smart) as |
| //!"typename SegmentManager::void_pointer" type. This allows |
| //!placing the allocator in shared memory, memory mapped-files, etc... |
| template<class T, class SegmentManager> |
| class allocator |
| { |
| public: |
| //Segment manager |
| typedef SegmentManager segment_manager; |
| typedef typename SegmentManager::void_pointer void_pointer; |
| |
| /// @cond |
| private: |
| |
| //Self type |
| typedef allocator<T, SegmentManager> self_t; |
| |
| //Pointer to void |
| typedef typename segment_manager::void_pointer aux_pointer_t; |
| |
| //Typedef to const void pointer |
| typedef typename |
| boost::pointer_to_other |
| <aux_pointer_t, const void>::type cvoid_ptr; |
| |
| //Pointer to the allocator |
| typedef typename boost::pointer_to_other |
| <cvoid_ptr, segment_manager>::type alloc_ptr_t; |
| |
| //Not assignable from related allocator |
| template<class T2, class SegmentManager2> |
| allocator& operator=(const allocator<T2, SegmentManager2>&); |
| |
| //Not assignable from other allocator |
| allocator& operator=(const allocator&); |
| |
| //Pointer to the allocator |
| alloc_ptr_t mp_mngr; |
| /// @endcond |
| |
| public: |
| typedef T value_type; |
| typedef typename boost::pointer_to_other |
| <cvoid_ptr, T>::type pointer; |
| typedef typename boost:: |
| pointer_to_other<pointer, const T>::type const_pointer; |
| typedef typename detail::add_reference |
| <value_type>::type reference; |
| typedef typename detail::add_reference |
| <const value_type>::type const_reference; |
| typedef std::size_t size_type; |
| typedef std::ptrdiff_t difference_type; |
| |
| typedef boost::interprocess::version_type<allocator, 2> version; |
| |
| /// @cond |
| |
| //Experimental. Don't use. |
| typedef boost::container::containers_detail::transform_multiallocation_chain |
| <typename SegmentManager::multiallocation_chain, T>multiallocation_chain; |
| /// @endcond |
| |
| //!Obtains an allocator that allocates |
| //!objects of type T2 |
| template<class T2> |
| struct rebind |
| { |
| typedef allocator<T2, SegmentManager> other; |
| }; |
| |
| //!Returns the segment manager. |
| //!Never throws |
| segment_manager* get_segment_manager()const |
| { return detail::get_pointer(mp_mngr); } |
| |
| //!Constructor from the segment manager. |
| //!Never throws |
| allocator(segment_manager *segment_mngr) |
| : mp_mngr(segment_mngr) { } |
| |
| //!Constructor from other allocator. |
| //!Never throws |
| allocator(const allocator &other) |
| : mp_mngr(other.get_segment_manager()){ } |
| |
| //!Constructor from related allocator. |
| //!Never throws |
| template<class T2> |
| allocator(const allocator<T2, SegmentManager> &other) |
| : mp_mngr(other.get_segment_manager()){} |
| |
| //!Allocates memory for an array of count elements. |
| //!Throws boost::interprocess::bad_alloc if there is no enough memory |
| pointer allocate(size_type count, cvoid_ptr hint = 0) |
| { |
| (void)hint; |
| if(count > this->max_size()) |
| throw bad_alloc(); |
| return pointer(static_cast<value_type*>(mp_mngr->allocate(count*sizeof(T)))); |
| } |
| |
| //!Deallocates memory previously allocated. |
| //!Never throws |
| void deallocate(const pointer &ptr, size_type) |
| { mp_mngr->deallocate((void*)detail::get_pointer(ptr)); } |
| |
| //!Returns the number of elements that could be allocated. |
| //!Never throws |
| size_type max_size() const |
| { return mp_mngr->get_size()/sizeof(T); } |
| |
| //!Swap segment manager. Does not throw. If each allocator is placed in |
| //!different memory segments, the result is undefined. |
| friend void swap(self_t &alloc1, self_t &alloc2) |
| { detail::do_swap(alloc1.mp_mngr, alloc2.mp_mngr); } |
| |
| //!Returns maximum the number of objects the previously allocated memory |
| //!pointed by p can hold. This size only works for memory allocated with |
| //!allocate, allocation_command and allocate_many. |
| size_type size(const pointer &p) const |
| { |
| return (size_type)mp_mngr->size(detail::get_pointer(p))/sizeof(T); |
| } |
| |
| std::pair<pointer, bool> |
| allocation_command(boost::interprocess::allocation_type command, |
| size_type limit_size, |
| size_type preferred_size, |
| size_type &received_size, const pointer &reuse = 0) |
| { |
| return mp_mngr->allocation_command |
| (command, limit_size, preferred_size, received_size, detail::get_pointer(reuse)); |
| } |
| |
| //!Allocates many elements of size elem_size in a contiguous block |
| //!of memory. The minimum number to be allocated is min_elements, |
| //!the preferred and maximum number is |
| //!preferred_elements. The number of actually allocated elements is |
| //!will be assigned to received_size. The elements must be deallocated |
| //!with deallocate(...) |
| multiallocation_chain allocate_many |
| (size_type elem_size, std::size_t num_elements) |
| { |
| return multiallocation_chain(mp_mngr->allocate_many(sizeof(T)*elem_size, num_elements)); |
| } |
| |
| //!Allocates n_elements elements, each one of size elem_sizes[i]in a |
| //!contiguous block |
| //!of memory. The elements must be deallocated |
| multiallocation_chain allocate_many |
| (const size_type *elem_sizes, size_type n_elements) |
| { |
| multiallocation_chain(mp_mngr->allocate_many(elem_sizes, n_elements, sizeof(T))); |
| } |
| |
| //!Allocates many elements of size elem_size in a contiguous block |
| //!of memory. The minimum number to be allocated is min_elements, |
| //!the preferred and maximum number is |
| //!preferred_elements. The number of actually allocated elements is |
| //!will be assigned to received_size. The elements must be deallocated |
| //!with deallocate(...) |
| void deallocate_many(multiallocation_chain chain) |
| { |
| return mp_mngr->deallocate_many(chain.extract_multiallocation_chain()); |
| } |
| |
| //!Allocates just one object. Memory allocated with this function |
| //!must be deallocated only with deallocate_one(). |
| //!Throws boost::interprocess::bad_alloc if there is no enough memory |
| pointer allocate_one() |
| { return this->allocate(1); } |
| |
| //!Allocates many elements of size == 1 in a contiguous block |
| //!of memory. The minimum number to be allocated is min_elements, |
| //!the preferred and maximum number is |
| //!preferred_elements. The number of actually allocated elements is |
| //!will be assigned to received_size. Memory allocated with this function |
| //!must be deallocated only with deallocate_one(). |
| multiallocation_chain allocate_individual |
| (std::size_t num_elements) |
| { return this->allocate_many(1, num_elements); } |
| |
| //!Deallocates memory previously allocated with allocate_one(). |
| //!You should never use deallocate_one to deallocate memory allocated |
| //!with other functions different from allocate_one(). Never throws |
| void deallocate_one(const pointer &p) |
| { return this->deallocate(p, 1); } |
| |
| //!Allocates many elements of size == 1 in a contiguous block |
| //!of memory. The minimum number to be allocated is min_elements, |
| //!the preferred and maximum number is |
| //!preferred_elements. The number of actually allocated elements is |
| //!will be assigned to received_size. Memory allocated with this function |
| //!must be deallocated only with deallocate_one(). |
| void deallocate_individual(multiallocation_chain chain) |
| { return this->deallocate_many(boost::interprocess::move(chain)); } |
| |
| //!Returns address of mutable object. |
| //!Never throws |
| pointer address(reference value) const |
| { return pointer(boost::addressof(value)); } |
| |
| //!Returns address of non mutable object. |
| //!Never throws |
| const_pointer address(const_reference value) const |
| { return const_pointer(boost::addressof(value)); } |
| |
| //!Copy construct an object |
| //!Throws if T's copy constructor throws |
| void construct(const pointer &ptr, const_reference v) |
| { new((void*)detail::get_pointer(ptr)) value_type(v); } |
| |
| //!Default construct an object. |
| //!Throws if T's default constructor throws |
| void construct(const pointer &ptr) |
| { new((void*)detail::get_pointer(ptr)) value_type; } |
| |
| //!Destroys object. Throws if object's |
| //!destructor throws |
| void destroy(const pointer &ptr) |
| { BOOST_ASSERT(ptr != 0); (*ptr).~value_type(); } |
| }; |
| |
| //!Equality test for same type |
| //!of allocator |
| template<class T, class SegmentManager> inline |
| bool operator==(const allocator<T , SegmentManager> &alloc1, |
| const allocator<T, SegmentManager> &alloc2) |
| { return alloc1.get_segment_manager() == alloc2.get_segment_manager(); } |
| |
| //!Inequality test for same type |
| //!of allocator |
| template<class T, class SegmentManager> inline |
| bool operator!=(const allocator<T, SegmentManager> &alloc1, |
| const allocator<T, SegmentManager> &alloc2) |
| { return alloc1.get_segment_manager() != alloc2.get_segment_manager(); } |
| |
| } //namespace interprocess { |
| |
| /// @cond |
| |
| template<class T> |
| struct has_trivial_destructor; |
| |
| template<class T, class SegmentManager> |
| struct has_trivial_destructor |
| <boost::interprocess::allocator <T, SegmentManager> > |
| { |
| enum { value = true }; |
| }; |
| /// @endcond |
| |
| } //namespace boost { |
| |
| #include <boost/interprocess/detail/config_end.hpp> |
| |
| #endif //BOOST_INTERPROCESS_ALLOCATOR_HPP |
| |