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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>
- #include <boost/interprocess/detail/os_file_functions.hpp>
- //[doc_managed_copy_on_write
- #include <boost/interprocess/managed_mapped_file.hpp>
- #include <fstream> //std::fstream
- #include <iterator>//std::distance
- //<-
- #include "../test/get_process_id_name.hpp"
- //->
- int main()
- {
- using namespace boost::interprocess;
- //Define file names
- //<-
- #if 1
- const char *ManagedFile = 0;
- const char *ManagedFile2 = 0;
- std::string managed_file_name(boost::interprocess::ipcdetail::get_temporary_path());
- managed_file_name += "/"; managed_file_name += test::get_process_id_name();
- ManagedFile = managed_file_name.c_str();
- std::string managed_file2_name(boost::interprocess::ipcdetail::get_temporary_path());
- managed_file2_name += "/"; managed_file2_name += test::get_process_id_name(); managed_file2_name += "_2";
- ManagedFile2 = managed_file2_name.c_str();
- #else
- //->
- const char *ManagedFile = "MyManagedFile";
- const char *ManagedFile2 = "MyManagedFile2";
- //<-
- #endif
- //->
- //Try to erase any previous managed segment with the same name
- file_mapping::remove(ManagedFile);
- file_mapping::remove(ManagedFile2);
- remove_file_on_destroy destroyer1(ManagedFile);
- remove_file_on_destroy destroyer2(ManagedFile2);
- {
- //Create an named integer in a managed mapped file
- managed_mapped_file managed_file(create_only, ManagedFile, 65536);
- managed_file.construct<int>("MyInt")(0u);
- //Now create a copy on write version
- managed_mapped_file managed_file_cow(open_copy_on_write, ManagedFile);
- //Erase the int and create a new one
- if(!managed_file_cow.destroy<int>("MyInt"))
- throw int(0);
- managed_file_cow.construct<int>("MyInt2");
- //Check changes
- if(managed_file_cow.find<int>("MyInt").first && !managed_file_cow.find<int>("MyInt2").first)
- throw int(0);
- //Check the original is intact
- if(!managed_file.find<int>("MyInt").first && managed_file.find<int>("MyInt2").first)
- throw int(0);
- { //Dump the modified copy on write segment to a file
- std::fstream file(ManagedFile2, std::ios_base::out | std::ios_base::binary);
- if(!file)
- throw int(0);
- file.write(static_cast<const char *>(managed_file_cow.get_address()), (std::streamsize)managed_file_cow.get_size());
- }
- //Now open the modified file and test changes
- managed_mapped_file managed_file_cow2(open_only, ManagedFile2);
- if(managed_file_cow2.find<int>("MyInt").first && !managed_file_cow2.find<int>("MyInt2").first)
- throw int(0);
- }
- {
- //Now create a read-only version
- managed_mapped_file managed_file_ro(open_read_only, ManagedFile);
- //Check the original is intact
- if(!managed_file_ro.find<int>("MyInt").first && managed_file_ro.find<int>("MyInt2").first)
- throw int(0);
- //Check the number of named objects using the iterators
- if(std::distance(managed_file_ro.named_begin(), managed_file_ro.named_end()) != 1 &&
- std::distance(managed_file_ro.unique_begin(), managed_file_ro.unique_end()) != 0 )
- throw int(0);
- }
- return 0;
- }
- //]
- #include <boost/interprocess/detail/config_end.hpp>
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