hg: mlvm/mlvm/hotspot: 2 new changesets

[Rémi Forax]

On 10/02/2011 03:03 AM, Mark Roos wrote:
>
> This is a pretty cool use of coroutines.
>
> I am trying a similar approach for a web browser base UI and was 
> looking for
> a pattern do handle the time out case.  So I send something to the UI, 
>  say open
> a dialog box, and suspend the coroutine.  but the UI never responds so 
> I have to
> have a loop checking time outs.

Let me explain how AsyncSwing works.
I try use the same coroutine (named uiCoroutine in the code) for all UI 
events.
The main coroutine, the one  which is implicit do the event pumping,
when an event is received, I yield to the uiCoroutine with the UI event
as argument, the uiCoroutine do the dispatch to the component
and switch back to the main coroutine.
If a call to a blocking IO is done in an event callback, it's done in 
the uiCoroutine
so I yield to the main coroutine with a command object (representing the 
work
to complete before yielding back), create a new coroutine and save it as the
new uiCoroutine for the next events and starts the command as an async IO
and go back in the event loop.

>
> I would like something on the coroutine like suspend but throw an 
> exception in
> x ms.  I could do it with threads ( suspend a cancelling thread for x 
> ms ) but I was
> looking for a light weight approach.
>
> Any thoughts on how to place a time out on a starved coroutine?

You have two ways to implement a timer. Or you post a special event 
containing
the deadline and re-post it if the current time doesn't match the deadline
(this is how javax.swing.Timer works), or you use a ScheduledThreadPool
with only one thread, submit a runnable when you start a timeout and
cancel the corresponding Future if the operation doesn't timeout
or if the runnable is scheduled, you just have to end the coroutine.

>
> regards
> mark

Rémi

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