NAME

Mail::Box::Locker::POSIX - lock a folder using kernel file-locking

INHERITANCE

Mail::Box::Locker::POSIX
  is a Mail::Box::Locker
  is a Mail::Reporter

SYNOPSIS

See Mail::Box::Locker

DESCRIPTION

This locker object is created by the folder to get an exclusive lock on the file which contains the data using the kernel's POSIX facilities. This lock is created on a separate file-handle to the folder file, so not the handle which is reading. Not all platforms support POSIX locking.

METHODS

Constructors

Mail::Box::Locker::POSIX->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  POSIX
 posix_file                     <undef>
 timeout     Mail::Box::Locker  10 seconds
 trace       Mail::Reporter     'WARNINGS'

expires => SECONDS

file => FILENAME

folder => FOLDER

log => LEVEL

method => STRING|CLASS|ARRAY

posix_file => FILENAME

Alternative name for file, especially useful to avoid confusion when the multi-locker is used.

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::POSIX->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::POSIX->log([LEVEL [,STRINGS]])

See "Error handling" in Mail::Reporter

$obj->logPriority(LEVEL)

Mail::Box::Locker::POSIX->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 lockf'd

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 POSIX lock file $filename for $folder: $!

For POSIX style locking, a folder it must be opened, which does not succeed for the specified reason.

Error: Will never get a POSIX lock at $filename for $folder: $!

Tried to lock 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 2.107, built on November 28, 2012. Website: http://perl.overmeer.net/mailbox/

LICENSE

Copyrights 2001-2012 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