> On May 13, 2016, at 12:34 PM, Carl Hoefs <[email protected]>
> wrote:
>
> As a test, the above works if run on the main thread, so I'm guessing it has
> something to do with there being no runloop after the background thread
> exits.
Yup. More precisely, the background thread has no runloop at all. Its top-level
function is the method you’re running, so as soon as your method returns, the
thread exits.
You can use runloops on background threads, but the thread’s top-level function
has to end with
[[NSRunLoop currentRunLoop] run];
which starts the runloop. That call generally never returns, unless you stop
that runloop.
These days it’s probably better to use dispatch queues instead.
—Jens
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