A simple coroutine library for c++, modeling coroutine from lua. usage: 1. create a schedluer: CoroutineScheduler* sched = new CoroutineScheduler(1024); 2. create coroutine: int id = sched->CreateCoroutine(func, arg); 3. run coroutine: uintptr_t ret = sched->ResumeCoroutine(id);