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

8 Jun 2009

      Tom:

Very clean!!  And probably not too hard to modify for re-usable  
shreds.  I'll report back.

- Rob

On 8 Jun 2009, at 15:18, Tom Lieber wrote:
...
On Mon, Jun 8, 2009 at 1:53 PM, Robert Poor 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/
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