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=begin TODO

Heartbeat

    a running process should be able to update the timestamp of
    their lockfiles (either the mtime known to the filesystem or
    in the file data themselves) to let other processes (on the
    same and other hosts) know that the locking process is still
    alive. Can you do that without releasing the lock?

    Include heartbeat data in the file names? "touch" lock files
    at the heartbeat so that the mtime's are updated?

Threads

    In  _ping_oldest_file , how to detect whether a thread is
    still alive? How to detect whether a process or thread on
    a remote machine is still alive?

    If a SyncObject2 is inherited in a fork or a thread,
    will DESTROY release its lock?

=end TODO