ad1b7f301c
- Removed all tabs - Changed all Doxygen @cond/@endcond tags with preprocessor sections, as Doxygen still has some problems when parsing this code. This also makes unmatched Doxygen sections a compilation error, which is easier to detect.
100 lines
3.6 KiB
C++
100 lines
3.6 KiB
C++
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// (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>
|