/ 
Mail-Box-3.012
River stage one • 8 direct dependents • 8 total dependents
/ Mail::Box::Locker::NFS

NAME

Mail::Box::Locker::NFS - lock a folder with a separate file, NFS-safe

INHERITANCE

Mail::Box::Locker::NFS
  is a Mail::Box::Locker
  is a Mail::Reporter

SYNOPSIS

See Mail::Box::Locker

DESCRIPTION

Like the ::DotLock locker, but then in an NFS-safe fashion. Over NFS, the creation of a file is not atomic. The ::DotLock locker depends on an atomic open system call, hence in not usable to lock a folder which accessed over NFS. The ::NFS locker is therefore more complicated (so therefore slower), but will work for NFS --and for local disks as well.

Extends "DESCRIPTION" in Mail::Box::Locker.

METHODS

Extends "METHODS" in Mail::Box::Locker.

Constructors

Extends "Constructors" in Mail::Box::Locker.

$class->new(%options)

Inherited, see "METHODS" in Mail::Box::Locker

-Option --Defined in       --Default
 expires  Mail::Box::Locker  1 hour
 file     Mail::Box::Locker  undef
 folder   Mail::Box::Locker  <C<undef>>
 log      Mail::Reporter     'WARNINGS'
 method   Mail::Box::Locker  'NFS'
 timeout  Mail::Box::Locker  10
 trace    Mail::Reporter     'WARNINGS'
expires => $seconds
file => $file
folder => $folder
log => LEVEL
method => $name|CLASS|\@names
timeout => $seconds|'NOTIMEOUT'
trace => LEVEL

Attributes

Extends "Attributes" in Mail::Box::Locker.

$obj->expires( [SECONDS] )

Inherited, see "Attributes" in Mail::Box::Locker

$obj->filename( [$filename] )

Inherited, see "Attributes" in Mail::Box::Locker

$obj->folder( [$folder] )

Inherited, see "Attributes" in Mail::Box::Locker

$obj->logSettings()

Inherited, see "Attributes" in Mail::Reporter

$obj->name()

Inherited, see "Attributes" in Mail::Box::Locker

$obj->timeout( [SECONDS] )

Inherited, see "Attributes" in Mail::Box::Locker

Locking

Extends "Locking" in Mail::Box::Locker.

$obj->hasLock()

Inherited, see "Locking" in Mail::Box::Locker

$obj->isLocked()

Inherited, see "Locking" in Mail::Box::Locker

$obj->lock()

Inherited, see "Locking" in Mail::Box::Locker

$obj->unlock()

Inherited, see "Locking" in Mail::Box::Locker

Error handling

Extends "Error handling" in Mail::Box::Locker.

$obj->AUTOLOAD()

Inherited, see "Error handling" in Mail::Reporter

$obj->addReport($object)

Inherited, see "Error handling" in Mail::Reporter

$any->defaultTrace( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )

Inherited, see "Error handling" in Mail::Reporter

$obj->errors()

Inherited, see "Error handling" in Mail::Reporter

$any->log( [$level, [$strings]] )

Inherited, see "Error handling" in Mail::Reporter

$any->logPriority($level)

Inherited, see "Error handling" in Mail::Reporter

$obj->notImplemented()

Inherited, see "Error handling" in Mail::Reporter

$obj->report( [$level] )

Inherited, see "Error handling" in Mail::Reporter

$obj->reportAll( [$level] )

Inherited, see "Error handling" in Mail::Reporter

$obj->trace( [$level] )

Inherited, see "Error handling" in Mail::Reporter

$obj->warnings()

Inherited, see "Error handling" in Mail::Reporter

Cleanup

Extends "Cleanup" in Mail::Box::Locker.

$obj->DESTROY()

Inherited, see "Cleanup" in Mail::Box::Locker

DIAGNOSTICS

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. Cast by lock()

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. Cast by notImplemented()

Warning: Removed expired lockfile $file

A lock $file was found which was older than the expiration period as specified with new(timeout). The lock file was successfully removed. Cast by lock()

Error: Unable to remove expired lockfile $file: $!

A lock file was found which was older than the expiration period as specified with the new(timeout) option. It is impossible to remove that lock file, so we need to wait until it vanishes by some external cause. Cast by lock()

SEE ALSO

This module is part of Mail-Box version 3.012, built on November 27, 2025. Website: http://perl.overmeer.net/CPAN/

LICENSE

For contributors see file ChangeLog.

This software is copyright (c) 2001-2025 by Mark Overmeer.

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