[Newbies] Wait for an external app

Levente Uzonyi leves at elte.hu
Sun Nov 7 15:58:28 UTC 2010

On Sun, 7 Nov 2010, Sean P. DeNigris wrote:

> While controlling QuickTime Player via Applescript from within the image, I
> want to play a CD track until it reaches a certain point.  QTP does not
> expose "playTo: aPosition" functionality, so I'm polling the track position
> until the time is reached.  I don't want to lock up Morphic, so I'm doing
> this in another thread.
> The following works, but I've never used threads before and wanted to get
> opinions.  What do you think?
>    cd play.
>    [ [ cd position < endTime ] whileTrue: [ Processor yield ].
>         cd pause ] fork.
> * "cd position" gets the track position via Applescript
> * endTime is a variable holding the time to play until

This will starve lower priority processes, because Processor yield only 
activates same or higher priority processes. A short delay is better.


> Sean
> -- 
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