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# =head1 SEE ALSO  L<Mail::Box::Locker::NFS>, L<File::NFSLock>.
#        L<File::SharedNFSLock>, L<IPC::ConcurrencyLimit::Lock::NFS>


=head1 SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Dir::Flock


You can also look for information at:

=over 4

=item * CPAN Ratings

L<http://cpanratings.perl.org/d/Dir-Flock>

=item * E<lt>mob@cpan.orgE<gt>

With the decommissioning of http://rt.cpan.org/, 
please send bug reports and feature requests
directly to the author's email address.

=back




=head1 AUTHOR

Marty O'Brien, E<lt>mob@cpan.orgE<gt>




=head1 LICENSE AND COPYRIGHT

Copyright (c) 2019-2020, Marty O'Brien

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.8 or,
at your option, any later version of Perl 5 you may have available.

See http://dev.perl.org/licenses/ for more information.

=cut



=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?

Threads

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

=end TODO