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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_grow
- #include <boost/interprocess/managed_shared_memory.hpp>
- #include <boost/interprocess/managed_mapped_file.hpp>
- #include <cassert>
- //<-
- #include "../test/get_process_id_name.hpp"
- //->
- class MyClass
- {
- //...
- };
- int main()
- {
- using namespace boost::interprocess;
- //Remove shared memory on construction and destruction
- struct shm_remove
- {
- //<-
- #if 1
- shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
- ~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
- #else
- //->
- shm_remove() { shared_memory_object::remove("MySharedMemory"); }
- ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
- //<-
- #endif
- //->
- } remover;
- //<-
- (void)remover;
- //->
- {
- //Create a managed shared memory
- //<-
- #if 1
- managed_shared_memory shm(create_only, test::get_process_id_name(), 1000);
- #else
- //->
- managed_shared_memory shm(create_only, "MySharedMemory", 1000);
- //<-
- #endif
- //->
- //Check size
- assert(shm.get_size() == 1000);
- //Construct a named object
- MyClass *myclass = shm.construct<MyClass>("MyClass")();
- //The managed segment is unmapped here
- //<-
- (void)myclass;
- //->
- }
- {
- //Now that the segment is not mapped grow it adding extra 500 bytes
- //<-
- #if 1
- managed_shared_memory::grow(test::get_process_id_name(), 500);
- #else
- //->
- managed_shared_memory::grow("MySharedMemory", 500);
- //<-
- #endif
- //->
- //Map it again
- //<-
- #if 1
- managed_shared_memory shm(open_only, test::get_process_id_name());
- #else
- //->
- managed_shared_memory shm(open_only, "MySharedMemory");
- //<-
- #endif
- //->
- //Check size
- assert(shm.get_size() == 1500);
- //Check "MyClass" is still there
- MyClass *myclass = shm.find<MyClass>("MyClass").first;
- assert(myclass != 0);
- //<-
- (void)myclass;
- //->
- //The managed segment is unmapped here
- }
- {
- //Now minimize the size of the segment
- //<-
- #if 1
- managed_shared_memory::shrink_to_fit(test::get_process_id_name());
- #else
- //->
- managed_shared_memory::shrink_to_fit("MySharedMemory");
- //<-
- #endif
- //->
- //Map it again
- //<-
- #if 1
- managed_shared_memory shm(open_only, test::get_process_id_name());
- #else
- //->
- managed_shared_memory shm(open_only, "MySharedMemory");
- //<-
- #endif
- //->
- //Check size
- assert(shm.get_size() < 1000);
- //Check "MyClass" is still there
- MyClass *myclass = shm.find<MyClass>("MyClass").first;
- assert(myclass != 0);
- //The managed segment is unmapped here
- //<-
- (void)myclass;
- //->
- }
- return 0;
- }
- //]
- #include <boost/interprocess/detail/config_end.hpp>
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