https://rein.kr/posts/2008-03-11-pthread-%ED%94%84%EB%A1%9C%EA%B7%B8%EB%9E%98%EB%A8%B8%EA%B0%80-win32%EC%97%90%EC%84%9C-%EB%B0%9F%EA%B8%B0-%EC%89%AC%EC%9A%B4-%EC%A7%80%EB%A2%B0-%ED%95%98%EB%82%98/