[Haskell-cafe] Wait forever in main thread

Hi, I'm writing a program which listens to some D-Bus signals using DBus.Client.onSignal function from dbus-client package. This function runs IO action in separate haskell thread when signal is received. My program does nothing except signal handling, so after setting up signals it has to wait indefinitely. Now I'm using not very clean (I think so) forever $ threadDelay 10000000 . Is there another (I mean, correct) method to do this thing?