Samples/MutexDemo.ps1
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[CmdletBinding()] param( [int]$NestedNum ) #region Init #region local functions function Get-LocalDefaultVariables { <# .Synopsis Load default arguemts for this PS-file. .DESCRIPTION Get setting files according to load order and set variables. Command prompt arguments will override any file settings .PARAMETER CallerInvocation $MyInvocation of calling code session .PARAMETER defineNew Add ALL variables found in setting files .PARAMETER overWriteExisting Turns the table for variable handling file content will override command line arguments #> [CmdletBinding(SupportsShouldProcess = $False)] param( [switch]$defineNew, [switch]$overWriteExisting ) foreach($settingsFile in (Get-SettingsFiles ".json")) { if (Test-Path $settingsFile) { Write-Verbose "$($MyInvocation.Mycommand) reading: [$settingsFile]" $DefaultParamters = Get-Content -Path $settingsFile -Encoding UTF8 | ConvertFrom-Json | Set-ValuesFromExpressions ForEach($property in $DefaultParamters.psobject.properties.name) { #Exclude PSDefaultParameterValues ("functionName:Variable":"Value") if (($property).IndexOf(':') -eq -1) { $var = Get-Variable $property -ErrorAction SilentlyContinue $value = $DefaultParamters.$property if (!$var) { if ($defineNew) { Write-Verbose "New Var: $property" $var = New-Variable -Name $property -Value $value -Scope 1 } } else { #We only overwrite non-set values if not forced if (!($var.Value) -or $overWriteExisting) { try { Write-Verbose "Var: $property" $var.Value = $value } Catch { $ex = $PSItem $ex.ErrorDetails = "Err adding $property from $settingsFile. " + $PSItem.Exception.Message throw $ex } } } } } } else { Write-Verbose "File not found: [$settingsFile]" } } } #endregion Remove-Module PSJumpStart Import-Module PSJumpStart -Force -MinimumVersion 2.0.0 #Retreive variables for this script (overwrite input arguments with -overWriteExisting). Get-LocalDefaultVariables #Get default paramters when calling functions (for example std-adserver) $PSDefaultParameterValues = Get-GlobalDefaultsFromJsonFiles $MyInvocation #endregion Write-Message "Session $NestedNum - Start Execution" #NOTE: Start two PS-windows 4 better demo #Same mutex id for all instances $MutexId = "de9a280d-ce61-4eca-adba-70332a68e065" #Create or wait for mutex Write-Message "Session $NestedNum - Wait for mutex release" $mutex = Wait-OnMutex $MutexId -WaitCycleCount 100 -WaitTimeMilliseconds 1000 #region Sensitive code!! May only run one instance at a time! if ($NestedNum -lt 1) { for ($i = 1; $i -lt 6; $i++) { Write-Message "Session $NestedNum - Call myself with argument -NestedNum $i" & $MyInvocation.MyCommand.Definition -NestedNum $i } } else { Write-Message "Session $NestedNum - wait 3 seconds" Start-Sleep -Seconds 3 } #endregion Write-Message "Session $NestedNum - Release Mutex and cleanup last error" Unlock-Mutex -MutexId $MutexId $Error.RemoveAt(0) Write-Message "Session $NestedNum - End Execution" |