Mail::Box::Locker::FloUser)Contributed Perl DocumenMail::Box::Locker::Flock(3)NAMEMail::Box::Locker::Flock - lock a folder using kernel file-locking
INHERITANCEMail::Box::Locker::Flock
is a Mail::Box::Locker
is a Mail::Reporter
SYNOPSIS
See Mail::Box::Locker
DESCRIPTION
The "::Flock" object locks the folder by creating an exclusive lock on
the file using the kernel's "flock" facilities. This lock is created
on a separate file-handle to the folder file, so not the handle which
is reading.
File locking does not work in some situations, for instance for
operating systems do not support "flock".
METHODS
Constructors
Mail::Box::Locker::Flock->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 'FLOCK'
timeout Mail::Box::Locker 10 seconds
trace Mail::Reporter 'WARNINGS'
expires => SECONDS
file => FILENAME
folder => FOLDER
log => LEVEL
method => STRING|CLASS|ARRAY
timeout => SECONDS|'NOTIMEOUT'
trace => LEVEL
The Locker
$obj->filename([FILENAME])
See "The Locker" in Mail::Box::Locker
$obj->folder([FOLDER])
See "The Locker" in Mail::Box::Locker
$obj->name
See "The Locker" in Mail::Box::Locker
Locking
$obj->hasLock
See "Locking" in Mail::Box::Locker
$obj->isLocked
$obj->lock
$obj->unlock
See "Locking" in Mail::Box::Locker
Error handling
$obj->AUTOLOAD
See "Error handling" in Mail::Reporter
$obj->addReport(OBJECT)
See "Error handling" in Mail::Reporter
$obj->defaultTrace([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK])
Mail::Box::Locker::Flock->defaultTrace([LEVEL]|[LOGLEVEL,
TRACELEVEL]|[LEVEL, CALLBACK])
See "Error handling" in Mail::Reporter
$obj->errors
See "Error handling" in Mail::Reporter
$obj->log([LEVEL [,STRINGS]])
Mail::Box::Locker::Flock->log([LEVEL [,STRINGS]])
See "Error handling" in Mail::Reporter
$obj->logPriority(LEVEL)
Mail::Box::Locker::Flock->logPriority(LEVEL)
See "Error handling" in Mail::Reporter
$obj->logSettings
See "Error handling" in Mail::Reporter
$obj->notImplemented
See "Error handling" in Mail::Reporter
$obj->report([LEVEL])
See "Error handling" in Mail::Reporter
$obj->reportAll([LEVEL])
See "Error handling" in Mail::Reporter
$obj->trace([LEVEL])
See "Error handling" in Mail::Reporter
$obj->warnings
See "Error handling" in Mail::Reporter
Cleanup
$obj->DESTROY
See "Cleanup" in Mail::Box::Locker
$obj->inGlobalDestruction
See "Cleanup" in Mail::Reporter
DIAGNOSTICS
Warning: Folder $folder already flocked
The folder is already locked, but you attempt to lock it again.
The behavior of double flock's is platform dependend, and therefore
should not be attempted. The second lock is ignored (but the
unlock isn't)
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.
Error: Unable to check lock file $filename for $folder: $!
To check whether the filename is used to flock a folder, the file
must be opened. Apparently this fails, which does not mean that
the folder is locked neither that it is unlocked.
Error: Unable to open flock file $filename for $folder: $!
For flock-ing a folder it must be opened, which does not succeed
for the specified reason.
Error: Will never get a flock at $filename for $folder: $!
Tried to flock the folder, but it did not succeed. The error code
received from the OS indicates that it will not succeed ever, so we
do not need to try again.
SEE ALSO
This module is part of Mail-Box distribution version 2.097, built on
January 26, 2011. Website: http://perl.overmeer.net/mailbox/
LICENSE
Copyrights 2001-2011 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
http://www.perl.com/perl/misc/Artistic.html
perl v5.14.1 2011-01-26 Mail::Box::Locker::Flock(3)