Ken ..
Thanks for your prompt reply, I really appreciate it.
I have revamped my code to have just one NSInvocationOperation whose
selector contains the long for-loop. A snippet looks like:
itsOps = [[NSInvocationOperation alloc] initWithTarget:self
selector:@selector(doAllOperations)
/* data passed
to selector */
object:nil];
[itsQueue addOperation:itsOps]; // itsQueue previously set =
[[NSOperationQueue alloc] init]
and the long for-loop is within -doAllOperations. It's my
understanding from the docs and other Cocoa mailing list readers that
when -addOperation: is called, a new background Thread is started up.
If that is true, then my long for-loop should be executing in the
background Thread. If I'm still on-track, then I have a problem in
that I temporarily placed a NSLog() call within my -doCalculation, but
nothing gets printed in my log. So, for the moment I am lost.
By the way, delving into NSOperations is for the moment just an
attempt to learn more since I have successfully called -
detachNewThreadSelector, as well as delved into NSMachPorts and
NSPortMessages with success. So, I'm just trying to learn a little
bit more here.
Again, thanks.
John
=======
On Oct 17, 09, at 10:20 PM, Ken Thomases wrote:
On Oct 16, 2009, at 8:01 AM, John Love wrote:
In my app, I have a very long for-loop
It appears however, that in my app there is no background Thread
that begins and the reason for that is because my app's window
stays in the background until all NSOperations are complete. Any
clues?
I suspect your app's window isn't staying in the background until
all NSOperations are complete, but rather that it's staying in the
background until your long for-loop completes.
You can't run a long for-loop on the main thread and expect event
handling to proceed. (Well, you can, but only if your for-loop is
handling events manually, itself.)
It sounds like you're fundamentally misunderstanding how things like
the main run loop, event processing, operation queues, your for-
loop, etc. interact.
Regards,
Ken
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