What is a .NET Mutex?
https://msdn.microsoft.com/en-us/library/system.threading.mutex(v=vs.110).aspx a primitive .NET type one thread owns it at a time WaitOne(int) »
A simple example of using an Observable in F#
open System; open System.Timers; open System.Threading.Tasks; let t1 = new Timer(float 500); let disposable = t1.Elapsed |> Observable.map(fun _ -> "t1" »