95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2006-2012. 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_cached_adaptive_pool
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#include <boost/interprocess/managed_shared_memory.hpp>
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#include <boost/interprocess/allocators/cached_adaptive_pool.hpp>
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#include <cassert>
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//<-
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#include "../test/get_process_id_name.hpp"
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//->
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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_remove
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{
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//<-
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#if 1
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shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
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~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
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#else
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//->
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shm_remove() { shared_memory_object::remove("MySharedMemory"); }
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~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
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//<-
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#endif
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//->
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} remover;
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//<-
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(void)remover;
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//->
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//Create shared memory
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//<-
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#if 1
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managed_shared_memory segment(create_only,test::get_process_id_name(), 65536);
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#else
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//->
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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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//<-
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#endif
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//->
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//Create a cached_adaptive_pool 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 cached_adaptive_pool<int, managed_shared_memory::segment_manager>
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cached_adaptive_pool_t;
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cached_adaptive_pool_t allocator_instance(segment.get_segment_manager());
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//The max cached nodes are configurable per instance
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allocator_instance.set_max_cached_nodes(3);
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//Create another cached_adaptive_pool. Since the segment manager address
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//is the same, this cached_adaptive_pool 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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cached_adaptive_pool_t allocator_instance2(segment.get_segment_manager());
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//The max cached nodes are configurable per instance
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allocator_instance2.set_max_cached_nodes(5);
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//Create another cached_adaptive_pool using copy-constructor. This
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//cached_adaptive_pool will also be attached to the same pool
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cached_adaptive_pool_t allocator_instance3(allocator_instance2);
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//We can clear the cache
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allocator_instance3.deallocate_cache();
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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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