| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (C) Copyright Ion Gaztanaga 2006-2009. 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; |
| |
| { |
| //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); |
| //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 |
| } |
| return 0; |
| } |
| //] |
| #include <boost/interprocess/detail/config_end.hpp> |