Method wait

src/engine/Engine.cpp:47–65

	}

	void wait() {
		std::unique_lock<std::mutex> lock(mutex);
		size_t currentPhase = phase;

		// Check if we're the last thread.
		if (++count >= threads) {
			// Advance phase and reset count
			count = 0;
			phase++;
			// Notify all other threads
			cv.notify_all();
			return;
		}

		// Unlock and wait on phase to change
		cv.wait(lock, [&] {
			return phase != currentPhase;
		});
	}
};