Re: How to get the dispatch queue for the current thread's runloop?
Re: How to get the dispatch queue for the current thread's runloop?
- Subject: Re: How to get the dispatch queue for the current thread's runloop?
- From: Kyle Sluder <email@hidden>
- Date: Fri, 27 Jan 2012 14:52:46 -0800
On Fri, Jan 27, 2012 at 12:14 PM, Jens Alfke <email@hidden> wrote:
> I'm really used to using -performSelector:withObject:afterDelay: to make something happen later. But I'd much rather use a block than a target/action. I can't find any API for this, however. Am I missing something? What I want is basically like
> PerformBlockAfterDelay(^{ …code here…}, 5.0);
>
> It looks like I should just call dispatch_async, but I'm unsure which dispatch queue to use. dispatch_get_main_queue only works for the main thread. Can I use dispatch_get_current_queue? I'm unsure of what this does when called on a background thread. The API docs say "If the call is made from any other thread, this function returns the default concurrent queue" … is that a queue associated with the thread's runloop, that's guaranteed to execute tasks on that thread?
My understanding is that you should treat the thread pool owned by a
dispatch queue as private. That means you probably shouldn't be
running an NSRunLoop on a dispatch worker thread.
If you need a thread (including cases where you need to run a
runloop), spawn a thread.
--Kyle Sluder
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