Re: Waiting for callback with GCD: impossible?
Re: Waiting for callback with GCD: impossible?
- Subject: Re: Waiting for callback with GCD: impossible?
- From: Seth Willits <email@hidden>
- Date: Wed, 08 Oct 2014 12:10:07 -0700
On Oct 8, 2014, at 11:59 AM, Jens Alfke <email@hidden> wrote:
> * Now, how does queue A wait for the callback? It seems to be impossible: the only way for code running on queue A to receive the callback is to return back to the queue dispatcher, so if it tries to wait it simply blocks the queue, causing a deadlock.
> …
> But given that dispatch queues can't do this, what's the solution to this design problem, i.e. turning an async call into a sync one?
Simply performing the rest of the task in the callback is one way.
--
Seth Willits
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