forked from HappyCerberus/kontr
/
Lock.pm
66 lines (56 loc) · 1.09 KB
/
Lock.pm
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# Lock.pm
#
# Copyright 2012 Tomáš Brukner <xbrukner@fi.muni.cz>
#
# Licensed under the MIT lincense:
# http://www.opensource.org/licenses/mit-license.php
package Lock;
use Fcntl;
use Moose;
use Moose::Util::TypeConstraints;
use Types;
has 'name' => (is => 'ro', isa => 'Str', required => 1);
has 'directory' => (is => 'ro', isa => 'Directory', required => 1);
sub _lock {
my $self = shift;
$self->directory.'/'.$self->name;
}
sub has_lock {
my $self = shift;
-f $self->_lock;
}
sub add_lock {
my $self = shift;
if ($self->has_lock) { return 0; }
my $fh;
if (not sysopen $fh, $self->_lock, O_WRONLY|O_EXCL|O_CREAT) {
return 0;
}
if (@_ == 1) {
print $fh $_[0];
}
close($fh);
return 1;
}
sub obtain_lock {
my $self = shift;
if (@_ == 1) {
while (not $self->add_lock($_[0])) {
sleep(int(rand(10)));
}
}
else {
while (not $self->add_lock()) {
sleep(int(rand(10)));
}
}
}
sub remove_lock {
my $self = shift;
if (not $self->has_lock) { return 0; }
my $lock = $self->_lock;
`unlink $lock;`;
not $self->has_lock;
}
no Moose;
__PACKAGE__->meta->make_immutable;