On Thu, Oct 3, 2013, at 10:55 AM, Jens Alfke wrote:
> The main thread of a Cocoa app has a runloop (of course) and also the
> main GCD dispatch queue. This is very handy because it means tasks on
> that thread can be scheduled either using the runloop (NSTimer or
> delayed-perform) or using GCD (dispatch_async, dispatch_sync).
> 
> But background threads don’t seem to have the same property. If I create
> a thread using NSThread, it supports a runloop, but I don’t see any API
> for getting or creating a dispatch queue that runs in conjunction with
> the runloop. Did I miss something?

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.

--Kyle Sluder

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