# encoding: utf-8
# api: powershell
# title: PS file locking
# description: The code uses a file locking mechanism to ensure that the
# version: 0.1
# type: script
# author: Michael R
# license: CC0
# x-poshcode-id: 1566
# x-archived: 2012-12-29T04:31:09
# x-published: 2012-01-11T12:36:00
#
# script beeing started is running exclusively. Mostly used where
# a powershell script is started parallel within a few seconds
#
#################################################
#Scriptname: checklock.ps1
#Author: Michael RΓΌefli (www.miru.ch)
#Date: 21.11.2009
#Description: The code uses a file locking mechanism to ensure that the
# script beeing started is running exclusively. Mostly used where
# a powershell script is started parallel within a few seconds
#
#Usage: Paste your code in the MAIN section and set the $lockfile paramater to match your needs
############################################
$lockfile = d:\lock.lck
$lockstatus = 0
While ($lockstatus -ne 1)
{
If (Test-Path $lockfile)
{
echo Lock file found!
$pidlist = Get-content $lockfile
If (!$pidlist)
{
$PID | Out-File $lockfile
$lockstatus = 1
}
$currentproclist = Get-Process | ? { $_.id -match $pidlist }
If ($currentproclist)
{
echo lockfile in use by other process!
$rndwait = New-Object system.Random
$rndwait= $rndwait.next(500,1000)
echo Sleeping for $rndwait Milliseconds
Start-Sleep -Milliseconds $rndwait
}
Else
{
Remove-Item $lockfile -Force
$PID | Out-File $lockfile
$lockstatus = 1
}
}
Else
{
$PID | Out-File $lockfile
$lockstatus = 1
}
}
#
## Main Script Part
## Here you can paste your code, in fact what the script has to do
echo Hi, it seems that no other script is doing the same as me now.. so I can do my job exclusively
## End of Main Part
#
#remove the lockfile
Remove-Item $lockfile -Force