William Prothero wrote:
> I've wondered what, specifically, "blocking" means. Does it mean that
> there are no idle messages sent? What is being blocked?
Given this:
on mouseUp
DoSomething
send "DoSomethingElse" to me
DoSomeOtherThing
end mouseUp
on DoSomethingElse
put 1+1 into gSomeVar
end DoSomethingElse
...then the continued execution of the "mouseUp" handler is effectively
blocked until DoSomethingElse completes.
But if we change the "send" line to this to defer its operation:
send "DoSomethingElse" to me in 20 millisecs
...then the mouseUp handler continues on its way to DoSomeOtherThing,
with DoSomethingElse happening 20 millisecs later, or at first idle if
other processing takes longer than 20 milliseconds to complete.
So in the first example, the order of messages as they execute is:
1. mouseUp
2. DoSomething
3. DoSomethingElse
4. DoSomeOtherThing
But with the timer introduced in the second example it becomes:
1. mouseUp
2. DoSomething
3. DoSomeOtherThing
4. DoSomethingElse
--
Richard Gaskin
Fourth World Systems
Software Design and Development for the Desktop, Mobile, and the Web
____________________________________________________________________
ambassa...@fourthworld.com http://www.FourthWorld.com
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