Question

How can I run code block in background periodically using GCD?
I am trying to write a game engine with several subsystems, like rendering, physics, game logic and so on. Some tasks should be event-driven, but some (like physics system) should be called periodically in the background with constant time (for example after 1/100 sec).
I created a block of code, but how can I run this block periodically in background? Is GCD right tool here?

Answer 1

What you want is a GCD dispatch source. For sample code, see the Creating a Timer Example.