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63 lines
2.4 KiB
C++
63 lines
2.4 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2006-2007. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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//[doc_node_allocator
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#include <boost/interprocess/managed_shared_memory.hpp>
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#include <boost/interprocess/allocators/node_allocator.hpp>
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#include <cassert>
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using namespace boost::interprocess;
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int main ()
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{
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//Remove shared memory on construction and destruction
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struct shm_destroy
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{
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shm_destroy() { shared_memory_object::remove("MySharedMemory"); }
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~shm_destroy(){ shared_memory_object::remove("MySharedMemory"); }
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} remover;
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//Create shared memory
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managed_shared_memory segment(create_only,
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"MySharedMemory", //segment name
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65536);
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//Create a node_allocator that allocates ints from the managed segment
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//The number of chunks per segment is the default value
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typedef node_allocator<int, managed_shared_memory::segment_manager>
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node_allocator_t;
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node_allocator_t allocator_instance(segment.get_segment_manager());
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//Create another node_allocator. Since the segment manager address
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//is the same, this node_allocator will be
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//attached to the same pool so "allocator_instance2" can deallocate
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//nodes allocated by "allocator_instance"
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node_allocator_t allocator_instance2(segment.get_segment_manager());
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//Create another node_allocator using copy-constructor. This
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//node_allocator will also be attached to the same pool
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node_allocator_t allocator_instance3(allocator_instance2);
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//All allocators are equal
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assert(allocator_instance == allocator_instance2);
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assert(allocator_instance2 == allocator_instance3);
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//So memory allocated with one can be deallocated with another
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allocator_instance2.deallocate(allocator_instance.allocate(1), 1);
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allocator_instance3.deallocate(allocator_instance2.allocate(1), 1);
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//The common pool will be destroyed here, since no allocator is
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//attached to the pool
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return 0;
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}
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//]
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#include <boost/interprocess/detail/config_end.hpp>
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