[chuck-users] implementing a "wait for signal with timeout"

[Tom Lieber]

On Mon, Jun 8, 2009 at 1:53 PM, Robert Poor<rdpoor at gmail.com> wrote:
> In real-time music making, sometimes you want to wait for a signal (e.g.
> event.broadcast()) OR for a specific time to elapse, whichever comes first.

I don't re-use shreds, but I think this is useful anyway:

---

class NoteEvent extends Event {
    0 => int sent;
}

public class Timeout {
    fun Event either(Event ev, dur d) {
        NoteEvent real;
        spork ~ time_alert(real, d);
        spork ~ event_alert(real, ev);
        return real;
    }

    fun void time_alert(NoteEvent real, dur d) {
        d => now;
        if(!real.sent)
            real.broadcast();
        1 => real.sent;
    }

    fun void event_alert(NoteEvent real, Event ev) {
        ev => now;
        if(!real.sent)
            real.broadcast();
        1 => real.sent;
    }
}

---

It's used like:

Timeout tout;
tout.either(some_event, 3::second) => now;

-- 
Tom Lieber
http://AllTom.com/