[kepler-dev] Threaded actors in the DE Domain

ian.brown@hsbcib.com ian.brown at hsbcib.com
Thu Sep 13 10:01:18 PDT 2007

Edward, when I press the run button, ptolemy.actor.Manager.execute() is
called ... and this runs the model until it is stopped. At the start, the
initialize() method of this class calls setDeferringChangeRequests(true).
This basically blocks any change requests.
setDeferringChangeRequests(false) is only called in the finally clause of
the execute() method once the model has been stopped.


             "Edward A. Lee"                                               
             <eal at eecs.berkele                                             
             y.edu>                                                     To 
                                       ian.brown at hsbcib.com                
             13/09/2007 17:04                                           cc 
             Mail Size: 10560          kepler-dev at ecoinformatics.org       
                                       Re: [kepler-dev] Threaded actors in 
                                       the DE Domain                       
                                       Investment Banking Europe - IBEU    

Ack, the call to executeChangeRequests() defeats the thread safety!
In fact, the code is equivalent to just doing it in line.

Why is the change request deferred?  What is the DE Director doing
when the change request is made?  Perhaps there is a bug there that
we should fix...  To find out, I would try setting a breakpoint
on the requestChange() line, and look at the state of the other
(main) thread when this request is made.  I don't understand why
the request would be ignored...


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