On Sunday 08 April 2007 01:32:47 Michael Hall wrote:
> My guess there might be that the OS X events are set up to be
> delivered on the main thread. There is no reason, assuming you can
They are, I think.
> receive them at all, that you couldn't immediately pass their
> processing off to another thread once you have them. You aren't
> required to stay on the main thread.
The problem is that you don't get them at all. To have the SWT part work, you
need to have your app start on the main thread. If you do this, then the OSX
events get completely lost.
> If they are throwing Carbon into the mix then they also get
> additional points for a even greater degree of difficulty.
Well, SWT uses carbon for its UI drawing and events, apparently due to the
fact that carbon and SWT have a very similar event model, so it was the easy
way out at the time SWT was written. Apple Java expects you to be using its
AWT-based stuff for events, which gives us the whole thread situation, as
they each need to have the primary thread. This isn't the same as spinning
off another JVM thread I think. My guess is that when you launch a JVM
normally, it starts two threads at the C level: one running an AWT-to-Cocoa
interface, the other running the actual JVM. When you want to use carbon
(like SWT does), you can't do that, you need the JVM (and thus the SWT
libraries) to be the primary thread so that events go straight to it, and the
whole AWT interface thing never happens, and so events never get passed
through. So what needs to be done is a JNI layer to add the openDoc listeners
through carbon, which seems to be how Azureus does it (from what I can tell).
I'm learning much more than I ever wanted to know about this :)
(And it turned out I had a typo in my procmail rules, so messages weren't
ending up in the right place, now I see the list properly:)
--
Robin <email@hidden> JabberID: <email@hidden>
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