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- //////////////////////////////////////////////////////////////////////////////
- //
- // (C) Copyright Ion Gaztanaga 2006-2012. 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.
- //
- //////////////////////////////////////////////////////////////////////////////
- #include <boost/interprocess/detail/config_begin.hpp>
- //[doc_managed_external_buffer
- #include <boost/interprocess/managed_external_buffer.hpp>
- #include <boost/interprocess/allocators/allocator.hpp>
- #include <boost/interprocess/containers/list.hpp>
- #include <cstring>
- #include <boost/aligned_storage.hpp>
- int main()
- {
- using namespace boost::interprocess;
- //Create the static memory who will store all objects
- const int memsize = 65536;
- static boost::aligned_storage<memsize>::type static_buffer;
- //This managed memory will construct objects associated with
- //a wide string in the static buffer
- wmanaged_external_buffer objects_in_static_memory
- (create_only, &static_buffer, memsize);
- //We optimize resources to create 100 named objects in the static buffer
- objects_in_static_memory.reserve_named_objects(100);
- //Alias an integer node allocator type
- //This allocator will allocate memory inside the static buffer
- typedef allocator<int, wmanaged_external_buffer::segment_manager>
- allocator_t;
- //Alias a STL compatible list to be constructed in the static buffer
- typedef list<int, allocator_t> MyBufferList;
- //The list must be initialized with the allocator
- //All objects created with objects_in_static_memory will
- //be stored in the static_buffer!
- MyBufferList *list = objects_in_static_memory.construct<MyBufferList>(L"MyList")
- (objects_in_static_memory.get_segment_manager());
- //<-
- (void)list;
- //->
- //Since the allocation algorithm from wmanaged_external_buffer uses relative
- //pointers and all the pointers constructed int the static memory point
- //to objects in the same segment, we can create another static buffer
- //from the first one and duplicate all the data.
- static boost::aligned_storage<memsize>::type static_buffer2;
- std::memcpy(&static_buffer2, &static_buffer, memsize);
- //Now open the duplicated managed memory passing the memory as argument
- wmanaged_external_buffer objects_in_static_memory2
- (open_only, &static_buffer2, memsize);
- //Check that "MyList" has been duplicated in the second buffer
- if(!objects_in_static_memory2.find<MyBufferList>(L"MyList").first)
- return 1;
- //Destroy the lists from the static buffers
- objects_in_static_memory.destroy<MyBufferList>(L"MyList");
- objects_in_static_memory2.destroy<MyBufferList>(L"MyList");
- return 0;
- }
- //]
- #include <boost/interprocess/detail/config_end.hpp>
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