RT performance, joyride-2288

[Victor Lazzarini]

Hello everyone,

I can detect a great improvement on RT performance for joyride-2288,
less xruns on sugar activities (testing a midi activity). There are still
xruns happening (esp. when there is something happening such as
a mouse movement etc.) but it is less.

In the terminal  with --sched I get a solid performance. I think this
bit of scheduler code could be moved to the csound library so that
it can be used by sugar activities as well. I'll see what I can do.

Victor Lazzarini
Music Technology Laboratory
Music Department
National University of Ireland, Maynooth