////////////////////////////////////////////////////////////////////////////// // // (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/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 std::string managed_file(boost::interprocess::ipcdetail::get_temporary_path()); managed_file += "/"; managed_file += test::get_process_id_name(); const char *ManagedFile = managed_file.c_str(); std::string managed_file2(boost::interprocess::ipcdetail::get_temporary_path()); managed_file2 += "/"; managed_file2 += test::get_process_id_name(); managed_file2 += "_2"; const char *ManagedFile2 = managed_file2.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>