Ensuring that two PowerShell scripts don't run at the same time

This quick PowerShell snippet shows how you can ensure only one instance of a script or section of a script executes at a time on a system, i.e. a server running scheduled tasks.

The script will wait while the other script or section completes. The Dispose method releases the mutex and allows any other scripts to take it and run. It should ideally be in a finally block to ensure it always gets released, although I've read that it uses a .NET critical finalizer to ensure release but I don't know if this works as well in PowerShell as it would in a proper .NET process.

    [System.Threading.Mutex]$mutant;
    try
    {
        # Obtain a system mutex that prevents more than one deployment taking place at the same time.
        [bool]$wasCreated = $false;
        $mutant = New-Object System.Threading.Mutex($true, "MyMutex", [ref] $wasCreated);        
        if (!$wasCreated)
        {            

            $mutant.WaitOne();
        }

        ### Do Work ###
    }
    finally
    {       

        $mutant.ReleaseMutex(); 
        $mutant.Dispose();
    }