[Boost-users] [Interprocess] Problem with file_lock on Linux

The following code #include <boost/interprocess/sync/file_lock.hpp> #include <iostream> #include <fstream> int main() { std::ofstream file("test.lock"); boost::interprocess::file_lock flock("test.lock"); std::cout << flock.try_lock(); std::cout << flock.try_lock() << std::endl; } outputs 10 on Windows and 11 on Linux. Shouldn't it also print 10 on Linux or am I missunderstanding file_lock? I've also tried locking from different threads, but no luck.