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every time.

=item whence => $whence

=item start => $start

=item len => $len

When C<fcntl> is selected as the lock type, this three additional
arguments can be used to define the section of the file that has to be
locked. See L<fcntl(2)> for the details.

=back

=head1 SEE ALSO

L<AnyEvent>.

L<perlfunc/flock>, L<perlfunc/fcntl>, L<fcntl(2)>, L<Fcntl>,
L<Fcntl::Packer>.