update.cpp

void update(){ // as in the update we call on each frame, be it RAF or dopeUpdate
  pollEvent();
  Barrier updateBarrier;
  scheduler.runTask(logicUpdate, updateBarrier); // launch the frame update task with a barrier
  render(); // the actual render called on the main thread
  scheduler.wait(updateBarrier); 
  render::swapQueues(); 
}

// single threaded : the logicUpdate will run before the render, and the wait after the render will have no effect. 
// So basically it will be:
// loop{
//   update frame N;
//   render frame N;
// }

// multi threaded: the logic update is called in a separate thread and the render of the previous frame is done in parallel
// if the render is longer than the logicUpdate, the wait has no effect.
// if the update is longer than the render, it waits for the update to finish.
// basically it will be:
// loop {
//    render frame N-1, update frame N;
// }