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Name
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DotLock.pm
2.81
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DotLock.pod
5.07
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FcntlLock.pm
2.59
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FcntlLock.pod
5.46
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Flock.pm
2.38
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Flock.pod
5.63
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Multi.pm
2.43
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Multi.pod
5.58
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Mutt.pm
2.39
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Mutt.pod
5.02
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NFS.pm
3.29
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NFS.pod
5.51
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2.71
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POSIX.pod
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Code Editor : NFS.pod
=encoding utf8 =head1 NAME Mail::Box::Locker::NFS - lock a folder with a separate file, NFS-safe =head1 INHERITANCE Mail::Box::Locker::NFS is a Mail::Box::Locker is a Mail::Reporter =head1 SYNOPSIS See Mail::Box::Locker =head1 DESCRIPTION Like the C<::DotLock> locker, but then in an NFS-safe fashion. Over NFS, the creation of a file is not atomic. The C<::DotLock> locker depends on an atomic C<open> system call, hence in not usable to lock a folder which accessed over NFS. The C<::NFS> locker is therefore more complicated (so therefore slower), but will work for NFS --and for local disks as well. Extends L<"DESCRIPTION" in Mail::Box::Locker|Mail::Box::Locker/"DESCRIPTION">. =head1 METHODS Extends L<"METHODS" in Mail::Box::Locker|Mail::Box::Locker/"METHODS">. =head2 Constructors Extends L<"Constructors" in Mail::Box::Locker|Mail::Box::Locker/"Constructors">. =over 4 =item Mail::Box::Locker::NFS-E<gt>B<new>(%options) -Option --Defined in --Default expires Mail::Box::Locker 1 hour file Mail::Box::Locker undef folder Mail::Box::Locker <undef> log Mail::Reporter 'WARNINGS' method Mail::Box::Locker 'NFS' timeout Mail::Box::Locker 10 trace Mail::Reporter 'WARNINGS' =over 2 =item expires => SECONDS =item file => FILENAME =item folder => FOLDER =item log => LEVEL =item method => STRING|CLASS|ARRAY =item timeout => SECONDS|'NOTIMEOUT' =item trace => LEVEL =back =back =head2 Attributes Extends L<"Attributes" in Mail::Box::Locker|Mail::Box::Locker/"Attributes">. =over 4 =item $obj-E<gt>B<expires>( [SECONDS] ) Inherited, see L<Mail::Box::Locker/"Attributes"> =item $obj-E<gt>B<timeout>( [SECONDS] ) Inherited, see L<Mail::Box::Locker/"Attributes"> =back =head2 The Locker Extends L<"The Locker" in Mail::Box::Locker|Mail::Box::Locker/"The Locker">. =over 4 =item $obj-E<gt>B<filename>( [$filename] ) Inherited, see L<Mail::Box::Locker/"The Locker"> =item $obj-E<gt>B<folder>( [$folder] ) Inherited, see L<Mail::Box::Locker/"The Locker"> =item $obj-E<gt>B<name>() Inherited, see L<Mail::Box::Locker/"The Locker"> =back =head2 Locking Extends L<"Locking" in Mail::Box::Locker|Mail::Box::Locker/"Locking">. =over 4 =item $obj-E<gt>B<hasLock>() Inherited, see L<Mail::Box::Locker/"Locking"> =item $obj-E<gt>B<isLocked>() Inherited, see L<Mail::Box::Locker/"Locking"> =item $obj-E<gt>B<lock>() =item $obj-E<gt>B<unlock>() Inherited, see L<Mail::Box::Locker/"Locking"> =back =head2 Error handling Extends L<"Error handling" in Mail::Box::Locker|Mail::Box::Locker/"Error handling">. =over 4 =item $obj-E<gt>B<AUTOLOAD>() Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<addReport>($object) Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<defaultTrace>( [$level]|[$loglevel, $tracelevel]|[$level, $callback] ) =item Mail::Box::Locker::NFS-E<gt>B<defaultTrace>( [$level]|[$loglevel, $tracelevel]|[$level, $callback] ) Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<errors>() Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<log>( [$level, [$strings]] ) =item Mail::Box::Locker::NFS-E<gt>B<log>( [$level, [$strings]] ) Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<logPriority>($level) =item Mail::Box::Locker::NFS-E<gt>B<logPriority>($level) Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<logSettings>() Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<notImplemented>() Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<report>( [$level] ) Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<reportAll>( [$level] ) Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<trace>( [$level] ) Inherited, see L<Mail::Reporter/"Error handling"> =item $obj-E<gt>B<warnings>() Inherited, see L<Mail::Reporter/"Error handling"> =back =head2 Cleanup Extends L<"Cleanup" in Mail::Box::Locker|Mail::Box::Locker/"Cleanup">. =over 4 =item $obj-E<gt>B<DESTROY>() Inherited, see L<Mail::Box::Locker/"Cleanup"> =back =head1 DIAGNOSTICS =over 4 =item Warning: Folder $folder already locked over nfs Do not try to lock the folder when the application already has the lock: it will give you dead-locks. =item Error: Package $package does not implement $method. Fatal error: the specific package (or one of its superclasses) does not implement this method where it should. This message means that some other related classes do implement this method however the class at hand does not. Probably you should investigate this and probably inform the author of the package. =item Warning: Removed expired lockfile $filename. A lock file was found which was older than the expiration period as specified with L<new(timeout)|Mail::Box::Locker/"METHODS">. The lock file was successfully removed. =item Error: Unable to remove expired lockfile $lockfile: $! A lock file was found which was older than the expiration period as specified with the L<new(timeout)|Mail::Box::Locker/"METHODS"> option. It is impossible to remove that lock file, so we need to wait until it vanishes by some external cause. =back =head1 SEE ALSO This module is part of Mail-Box distribution version 3.009, built on August 18, 2020. Website: F<http://perl.overmeer.net/CPAN/> =head1 LICENSE Copyrights 2001-2020 by [Mark Overmeer]. For other contributors see ChangeLog. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See F<http://dev.perl.org/licenses/>
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