I suppose it's possible. The spawned thread does a lot of setup then
iterates some arrays of a bunch of objects in the filesystem that it
needs to delete. The idea is to update the progress bar one increment
with each item being deleted. I'm using a MacBook 2.16 Ghz but I doubt
that the main thread is too slow to be able to do the updates.
Also, I set a message text item with the name of each item being deleted
in the window as the worker thread runs. I never see it change even for
an instant. I find it hard to believe that there can't be any visual
update no matter how quickly the worker thread completes.
Hank Heijink (Mailinglists) wrote:
Just checking the obvious here - is it possible that your worker thread
completes its work so fast that the main run loop hasn't updated the
screen once before it's done? Keep in mind that the main thread has to
display your window with the progress bar and the text and (depending on
your implementation) that your worker thread may be working (and
completing) while that's being done.
On Mar 30, 2008, at 2:55 PM, Mike wrote:
I have all my UI running on my app's main thread. I have a worker
thread that I detach with detachNewThreadSelector:toTarget:withObject:
(my worker thread).
In my worker thread I do a tight processing loop and one of the things
I do in the loop is call two methods in the main thread to update the
display (a text message and progress bar) - via
performSelectorOnMainThread:withObject:waitUntilDone:modes.
However, when the loop runs in the spawned thread, the display doesn't
get updated. If I insert a sleep(1) call into the loop, then the
display updates.
Why doesn't the main thread process the changes to the UI unless I
call sleep? I thought the whole idea of using a separate thread was so
that the main thread could continue to run on its own?
Thanks,
Mike
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