On Jun 22, 2010, at 5:21 PM, John Michael Zorko wrote:

> 2. However, CFReadStreams created _while_ the app was in the background often 
> (though not always) _don't_ call their callbacks _until_ the app is brought 
> in the foreground, then all of a sudden the callback happens.

I think foreground/background is a red herring — that has almost no effect on 
the behavior of the app.

What I _have_ seen is bugs in my code that result in incoming activity (like 
network I/O) not waking up the runloop, so the event doesn’t get delivered … 
until some other event comes in and causes the runloop to wake up. This is a 
lot likelier to happen when the app is in the background, because when it’s 
active there are user events (even the mouse entering/exiting views) that keep 
the runloop going pretty often.

Unfortunately I don’t remember the details of what caused this situation. I 
would look very carefully at your CFStream callbacks: what they do and how they 
get registered. Scan the system docs to make sure you’re doing everything 
correctly.

—Jens_______________________________________________

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