On Oct 3, 2013, at 11:46 AM, Kyle Sluder <[email protected]> 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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