title: Is there a way to limit the number of threads spawned by GCD in my application?
body: <p>I know that the max number of threads spawned cannot exceed 66 through the response to <a href="https://stackoverflow.com/questions/7213845/number-of-threads-created-by-gcd">this question</a>. But is there a way to limit the thread count to a value which an user has defined?</p>