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Full Discussion: Locking in Unix?
Top Forums UNIX for Dummies Questions & Answers Locking in Unix? Post 302160830 by nguoidoius on Tuesday 22nd of January 2008 09:48:39 PM
Old 01-22-2008
Locking in Unix?

Hi all!
I want to know about Mapping Filesystems to
Multiprocessor Systems
.( lock ...) and Traditional UNIX Locking Primitives. Can you help me?

Last edited by nguoidoius; 01-22-2008 at 10:58 PM..
 

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Mail::Box::Locker::Multi(3pm)				User Contributed Perl Documentation			     Mail::Box::Locker::Multi(3pm)

NAME
Mail::Box::Locker::Multi - lock a folder in all ways which work INHERITANCE
Mail::Box::Locker::Multi is a Mail::Box::Locker is a Mail::Reporter SYNOPSIS
See Mail::Box::Locker DESCRIPTION
The "::Multi" locker locks a folder in each way it can. This way, the chance is highest that any other program will leave the folder alone during our access to it. NFS-lock and Flock are tried. More may be added when the ways to lock are extended. DotLock overlaps with NFS-lock, but NFS-lock is safer, so that version is preferred. METHODS
Constructors Mail::Box::Locker::Multi->new(OPTIONS) You may also pass all OPTIONS understood by the initiated lockers used by the multi locker. -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 'MULTI' timeout Mail::Box::Locker 10 seconds trace Mail::Reporter 'WARNINGS' use <all possible> expires => SECONDS file => FILENAME folder => FOLDER log => LEVEL method => STRING|CLASS|ARRAY timeout => SECONDS|'NOTIMEOUT' trace => LEVEL use => ARRAY-of-(NAMES|LOCKER) Array of locker type NAMES or LOCKER objects to be used to lock one folder. The type NAMES are converted into objects. When you create your own LOCKER objects, be sure to set the timeout very short (preferrably to 1). Some locking types are not available on some platforms, so they will not be excluded from the default list (NFS POSIX Flock). example: using a subset of multi-lockers my $locker = Mail::Box::Locker::Multi->new(use => ['DOTLOCK','FLOCK']); The Locker $obj->filename([FILENAME]) See "The Locker" in Mail::Box::Locker $obj->folder([FOLDER]) See "The Locker" in Mail::Box::Locker $obj->lockers() Returns a list with all locker objects used by this object. $obj->name() See "The Locker" in Mail::Box::Locker Locking $obj->hasLock() See "Locking" in Mail::Box::Locker $obj->isLocked() See "Locking" in Mail::Box::Locker $obj->lock(FOLDER) See "Locking" in Mail::Box::Locker $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::Multi->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::Multi->log([LEVEL [,STRINGS]]) See "Error handling" in Mail::Reporter $obj->logPriority(LEVEL) Mail::Box::Locker::Multi->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
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. SEE ALSO
This module is part of Mail-Box distribution version 2.105, built on May 07, 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 perl v5.14.2 2012-05-07 Mail::Box::Locker::Multi(3pm)
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