Re: Can I create a thread with a runloop and a dispatch queue?
Re: Can I create a thread with a runloop and a dispatch queue?
- Subject: Re: Can I create a thread with a runloop and a dispatch queue?
- From: Jens Alfke <email@hidden>
- Date: Thu, 03 Oct 2013 12:00:22 -0700
On Oct 3, 2013, at 11:46 AM, Kyle Sluder <email@hidden> wrote:
> There is magic sauce in CFRunLoop that runs the main queue as part of
> processing the runloop. All other queues are managed by code running on
> a thread managed by libdispatch. The main queue is a special case; it
> doesn't make sense for this relationship to exist for other queues.
Why doesn’t it make sense?
A runloop is conceptually very much like a serial dispatch queue. Both are mechanisms for handling incoming requests/calls/events in order. Why are the two divorced, except for the special case of the main thread?
I think this would fix some current problems. For example, dispatch_get_current_queue is deprecated, and the only reason I can think of is that it may return NULL if the caller isn’t running under the control of a dispatch queue. If threads with runloops had dispatch queues, then dispatch_get_current_queue would work correctly in this very common case, making it more reliable.
—Jens
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