package Tie::Handle::Flock;
use warnings;
use strict;
require Tie::Handle;
our @ISA = qw(Tie::StdHandle);
our $VERSION = '0.02';
use Fcntl qw(:flock :seek);
# WRITE this, scalar, length, offset
sub WRITE {
my $fh = shift;
$fh->lock();
$fh->SUPER::WRITE( @_ );
$fh->unlock();
}
# PRINT this, LIST
sub PRINT {
my $fh = shift;
$fh->lock();
$fh->SUPER::PRINT( @_ );
$fh->unlock();
}
# PRINTF this, format, LIST
sub PRINTF {
my $fh = shift;
$fh->lock();
$fh->SUPER::PRINTF( @_ );
$fh->unlock();
}
sub lock {
my ($fh) = @_;
flock($fh, LOCK_EX);
seek( $fh, 0, SEEK_END );
}
sub unlock {
my ($fh) = @_;
flock($fh, LOCK_UN);
}
=head1 NAME
Tie::Handle::Flock - exclusive locking write handle
=head1 VERSION
Version 0.02
=head1 SYNOPSIS
use Tie::Handle::Flock;
tie *FH, 'Tie::Handle::Flock', '>', 'some_file.txt';
print FH "exclusive lock obtained for duration of the write\n";
=head1 AUTHOR
Ivan Heffner, C<< <iheffner+tie.handle.flock at gmail.com> >>
=head1 BUGS
Please report any bugs or feature requests to C<bug-tie-handle-flock at rt.cpan.org>, or through
the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Tie-Handle-Flock>. I will
be notified, and then you'll automatically be notified of progress on your bug as I make changes.
=head1 SUPPORT
You can find documentation for this module with the perldoc command.
perldoc Tie::Handle::Flock
You can also look for information at:
=over 4
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Tie-Handle-Flock>
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/Tie-Handle-Flock>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/Tie-Handle-Flock>
=item * Search CPAN
L<http://search.cpan.org/dist/Tie-Handle-Flock/>
=back
=head1 COPYRIGHT & LICENSE
Copyright 2009 Ivan Heffner, all rights reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=cut
1; # End of Tie::Handle::Flock