profiler.py 文件源码

def start_profiler():
    global _state

    _state = GlobalState()

    frame = sys._getframe(0)
    current_greenlet = greenlet.getcurrent()  # pylint: disable=no-member

    thread_state = ensure_thread_state(current_greenlet, frame)
    _state.last = thread_state

    # this needs to be instantiate before the handler is installed
    greenlet.settrace(greenlet_profiler)  # pylint: disable=no-member
    sys.setprofile(thread_profiler)
    threading.setprofile(thread_profiler)