135 lines
3.4 KiB
C++
135 lines
3.4 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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//[doc_managed_grow
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#include <boost/interprocess/managed_shared_memory.hpp>
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#include <boost/interprocess/managed_mapped_file.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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class MyClass
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{
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//...
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};
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int main()
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{
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using namespace boost::interprocess;
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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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{
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//Create a managed shared memory
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//<-
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#if 1
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managed_shared_memory shm(create_only, test::get_process_id_name(), 1000);
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#else
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//->
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managed_shared_memory shm(create_only, "MySharedMemory", 1000);
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//<-
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#endif
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//->
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//Check size
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assert(shm.get_size() == 1000);
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//Construct a named object
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MyClass *myclass = shm.construct<MyClass>("MyClass")();
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//The managed segment is unmapped here
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//<-
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(void)myclass;
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//->
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}
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{
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//Now that the segment is not mapped grow it adding extra 500 bytes
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//<-
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#if 1
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managed_shared_memory::grow(test::get_process_id_name(), 500);
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#else
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//->
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managed_shared_memory::grow("MySharedMemory", 500);
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//<-
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#endif
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//->
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//Map it again
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//<-
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#if 1
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managed_shared_memory shm(open_only, test::get_process_id_name());
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#else
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//->
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managed_shared_memory shm(open_only, "MySharedMemory");
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//<-
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#endif
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//->
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//Check size
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assert(shm.get_size() == 1500);
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//Check "MyClass" is still there
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MyClass *myclass = shm.find<MyClass>("MyClass").first;
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assert(myclass != 0);
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//<-
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(void)myclass;
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//->
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//The managed segment is unmapped here
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}
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{
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//Now minimize the size of the segment
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//<-
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#if 1
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managed_shared_memory::shrink_to_fit(test::get_process_id_name());
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#else
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//->
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managed_shared_memory::shrink_to_fit("MySharedMemory");
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//<-
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#endif
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//->
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//Map it again
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//<-
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#if 1
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managed_shared_memory shm(open_only, test::get_process_id_name());
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#else
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//->
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managed_shared_memory shm(open_only, "MySharedMemory");
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//<-
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#endif
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//->
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//Check size
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assert(shm.get_size() < 1000);
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//Check "MyClass" is still there
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MyClass *myclass = shm.find<MyClass>("MyClass").first;
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assert(myclass != 0);
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//The managed segment is unmapped here
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//<-
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(void)myclass;
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//->
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}
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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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