os.set_inheritable(fd, False) is required

[e271p314]

with FileLock('.lock') as lock:
    os.set_inheritable(lock._lock_file_fd, False)
    f() # holds the lock, runs multiprocessing

a call to os.set_inheritable(lock._lock_file_fd, False) is required in case f runs multiprocessing, otherwise, in some cases the code gets "stuck". Since there no getter for the lock file fd, it requires to access "private" member. Maybe add the inheritable flag as param in FileLock c'tor? or provide access to lock file fd from API?

UPDATE: I see in fd-inheritance

...file descriptors created by Python are non-inheritable by default

So I guess os.set_inheritable(lock._lock_file_fd, False) does not help