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Man Pages


Manual Reference Pages  -  UBIC::SINGLETONLOCK (3)

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NAME

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

CONTENTS

VERSION

version 1.58

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

<B>Ubic::SingletonLock->new($filename)B>
<B>Ubic::SingletonLock->new($filename, B>$options<B>)B> 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) 2015 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.

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perl v5.20.3 UBIC::SINGLETONLOCK (3) 2015-01-27

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