#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
#include <cstring>
#include <cstdlib>
#include <string>

#include <atlbase.h>

struct co_uninitializer{ ~co_uninitializer() { CoUninitialize(); } };

int main(int argc, char *argv[])
{
    using namespace boost::interprocess;

    if(argc == 1){  //Parent process

        //Remove shared memory on construction and destruction
        struct shm_remove
        {
            shm_remove() { shared_memory_object::remove("MySharedMemory"); }
            ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
        } remover;

        //Create a shared memory object.
        shared_memory_object shm (create_only, "MySharedMemory", read_write);

        //Set size
        shm.truncate(1000);

        //Map the whole shared memory in this process
        mapped_region region(shm, read_write);

        //Write all the memory to 1
        std::memset(region.get_address(), 1, region.get_size());

        //Launch child process
        std::string s(argv[0]);
        s = "\"" + s + "\"" + " child ";

        if(0 != std::system( s.c_str() ) )
            return 1;
    }
    else{

        CoInitializeEx(NULL, COINIT_MULTITHREADED );  //***********
        co_uninitializer co_uninit;                   //***********

        //Open already created shared memory object.
        shared_memory_object shm (open_only, "MySharedMemory", read_only);

        //Map the whole shared memory in this process
        mapped_region region(shm, read_only);

        //Check that memory was initialized to 1
        char *mem = static_cast<char*>(region.get_address());
        for(std::size_t i = 0; i < region.get_size(); ++i)
            if(*mem++ != 1)
                return 1;   //Error checking memory
    }
    return 0;
}