On Oct 3, 2013, at 11:58 AM, Ken Thomases <[email protected]> wrote:

> That said, it's simple enough to write a category on NSThread such that you 
> can ask a thread to run a block and it will do so when its run loop is run.  
> Basically, it would leverage -[NSObject performSelector:onThread:…] and the 
> block would run in the same circumstances as a selector would.

I’ve already got that and use it a lot in my code (see MYBlockUtils.m in 
MYUtilities.)

> There is the question of why you want to dedicate a thread to running such 
> requests (and other run loop sources) rather than using the GCD worker 
> threads.

Because I’ve got tens of thousands of lines of code*, a lot of which does some 
tricky asynchronous work using the runloop/thread paradigm, and I don’t want to 
break it by rewriting all of it en masse to use GCD. If I could start using GCD 
in new parts of the code that would be great, but when I tried to do so I ran 
into these impedance mismatches and had to tear it out.

—Jens

* https://github.com/couchbase/couchbase-lite-ios
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