Re: iOS4: CFReadStream and background operation
Re: iOS4: CFReadStream and background operation
- Subject: Re: iOS4: CFReadStream and background operation
- From: Jens Alfke <email@hidden>
- Date: Tue, 22 Jun 2010 18:37:52 -0700
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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