single_app

#include <iostream>
#include <cstdio>
#include <boost/interprocess/sync/file_lock.hpp>
#include <boost/interprocess/sync/scoped_lock.hpp>

int main(int argc, char** argv)
{
    namespace ipc = boost::interprocess;
    std::fclose(std::fopen("lock", "w"));
    ipc::file_lock flock("lock");
    ipc::scoped_lock<ipc::file_lock> lock(flock, ipc::defer_lock);
    if (lock.try_lock())
        std::cout << "ok\n";
    else
        std::cout << "fail\n";
    std::system("PAUSE");
	return 0;
}