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资源说明：simple file locking scheme
LockFile::Simple 0.206
Copyright (c) 2000,2007, Johan Vromans
LockFile::Simple 0.2
Copyright (c) 1998-1999, Raphael Manfredi
------------------------------------------------------------------------
This program is free software; you can redistribute it and/or
modify it under the terms of the Perl Artistic License or the GNU
General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Artistic License for more details.
------------------------------------------------------------------------
*** This is alpha software -- use at your own risks ***
Name DSLI Description Info
----------- ---- -------------------------------------------- -----
LockFile:: Application-level locking facilities
::Simple adpr Simple file locking mechanism RAM
::Lock:: ---- Lock handles created by LockFile::* schemes RAM
::Manager ---- Records locks created by LockFile::* RAM
SYNOPSIS
#
# The simple way
#
use LockFile::Simple qw(lock unlock);
lock("file") || die "Can't lock file\n";
open(FILE, ">>file") || die "Can't append to file: $!\n";
....
close FILE;
unlock("file");
#
# The more elaborated way
#
use LockFile::Simple;
my $scheme = LockFile::Simple->make(
-autoclean => 1,
-format => "%f.lck");
$scheme->lock($0, "/var/run/%F.%p") || die "already running";
my $lock = $sheme->lock("file");
open(FILE, ">>file") || die "Can't append to file: $!\n";
....
close FILE;
$lock->release;
DESCRIPTION
The LockFile::Simple extension provides simple file locking, of
the advisory kind, i.e. it requires cooperation between applications
wishing to lock the same files.
It is meant to be used in quick-and-dirty scripts or more elaborated
programs that want a simple locking scheme, yet with a reasonable
level of configuration.
This code comes from the mailagent-3.0 package and retains most
of its configuration abilities.
I do not intend to leave this simple scheme as-is forever. The code is
designed to be extended to offer other locking schemes, such as
MTA locking--usually a combination of this simple scheme and flock().
Despite being flagged as simple and not bullet proof all over the
place, locking is good enough in practice for simple applications
wishing to protect against concurrent actions.
There is an embeded POD manual page in Simple.pm.
-- Raphael Manfredi
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