NAME

Ubic::SingletonLock - lock which can be safely created several times from the same process without deadlocking

VERSION

version 1.60

SYNOPSIS

use Ubic::SingletonLock;

$lock = Ubic::SingletonLock->new($file);
$lock_again = Ubic::SingletonLock->new($file); # this works, unlike Ubic::Lockf which would deadlock at this moment
undef $lock;

METHODS

Ubic::SingletonLock->new($filename)

Ubic::SingletonLock->new($filename, $options)

Construct new singleton lock.

Consequent invocations with the same $filename will return the same object if previous object still exists somewhere in process memory.

Any options will be passed directly to Ubic::Lockf.

BUGS AND CAVEATS

This module is a part of ubic implementation and shouldn't be used in non-core code.

It passes options blindly to Ubic::Lockf, so following code will not work correctly:

$lock = Ubic::SingletonLock->new("file", { shared => 1 });
$lock = Ubic::SingletonLock->new("file"); # this call will just return cached shared lock again

AUTHOR

Vyacheslav Matyukhin <mmcleric@yandex-team.ru>

COPYRIGHT AND LICENSE

This software is copyright (c) 2016 by Yandex LLC.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.