| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (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> |
| #include <boost/interprocess/detail/workaround.hpp> |
| |
| #include <boost/interprocess/containers/list.hpp> |
| #include <boost/interprocess/managed_mapped_file.hpp> |
| #include <boost/interprocess/allocators/allocator.hpp> |
| #include <cstddef> |
| #include <cstdio> |
| |
| using namespace boost::interprocess; |
| typedef list<int, allocator<int, managed_mapped_file::segment_manager> > |
| MyList; |
| |
| int main () |
| { |
| const char *FileName = "file_mapping"; |
| const std::size_t FileSize = 1000; |
| file_mapping::remove(FileName); |
| try{ |
| std::size_t old_size = 0; |
| managed_mapped_file::handle_t list_handle; |
| { |
| managed_mapped_file mfile_memory(create_only, FileName, FileSize); |
| MyList *mylist = mfile_memory.construct<MyList>("MyList") |
| (mfile_memory.get_segment_manager()); |
| |
| //Obtain handle, that identifies the list in the buffer |
| list_handle = mfile_memory.get_handle_from_address(mylist); |
| |
| //Fill list until there is no more room in the file |
| try{ |
| while(1) { |
| mylist->insert(mylist->begin(), 0); |
| } |
| } |
| catch(const bad_alloc &){ |
| //mapped file is full |
| } |
| //Let's obtain the size of the list |
| old_size = mylist->size(); |
| } |
| //To make the list bigger, let's increase the mapped file |
| //in FileSize bytes more. |
| managed_mapped_file::grow(FileName, FileSize*2); |
| |
| { |
| managed_mapped_file mfile_memory(open_only, FileName); |
| |
| |
| //If mapping address has changed, the old pointer is invalid, |
| //so use previously obtained handle to find the new pointer. |
| MyList *mylist = static_cast<MyList *> |
| (mfile_memory.get_address_from_handle(list_handle)); |
| |
| //Fill list until there is no more room in the file |
| try{ |
| while(1) { |
| mylist->insert(mylist->begin(), 0); |
| } |
| } |
| catch(const bad_alloc &){ |
| //mapped file is full |
| } |
| |
| //Let's obtain the new size of the list |
| std::size_t new_size = mylist->size(); |
| |
| assert(new_size > old_size); |
| |
| //Destroy list |
| mfile_memory.destroy_ptr(mylist); |
| } |
| } |
| catch(...){ |
| file_mapping::remove(FileName); |
| throw; |
| } |
| file_mapping::remove(FileName); |
| return 0; |
| } |
| |
| #include <boost/interprocess/detail/config_end.hpp> |