On Wed, Sep 14, 2011 at 11:00 AM, Dave Zarzycki <zarzy...@apple.com> wrote:
> Dispatch queues exist to solve both the synchronous and asynchronous
> producer/consumer pattern. If you want the producer to wait until the
> consumer is done, then use dispatch_sync() instead of dispatch_async():
>
> x = create_something();
> dispatch_sync(consumer_q, ^{
> do_something_with(x);
> });
> // do_something_with() is done
>
> That's it. Easy, huh? :-)
I think the point is to wait until the _handoff_, not necessarily
until the consumer is finished _consuming_. For example, the producer
can work on producing the next object to be consumed while the
consumer is consuming the previous one.
I think using the dispatch_sync(some_q, ^{ dispatch_async(some_q,
^{}); }) technique accomplishes that.
--Kyle Sluder
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