Function inputhook_wx3

IPython/terminal/pt_inputhooks/wx.py:102–150

Run the wx event loop by processing pending events only. This is like inputhook_wx1, but it keeps processing pending events until stdin is ready. After processing all pending events, a call to time.sleep is inserted. This is needed, otherwise, CPU usage is at 100%. This sleep time

(context)

@ignore_keyboardinterrupts
def inputhook_wx3(context):
    """Run the wx event loop by processing pending events only.

    This is like inputhook_wx1, but it keeps processing pending events
    until stdin is ready.  After processing all pending events, a call to
    time.sleep is inserted.  This is needed, otherwise, CPU usage is at 100%.
    This sleep time should be tuned though for best performance.
    """
    app = wx.GetApp()
    if app is not None:
        assert wx.Thread_IsMain()

        # The import of wx on Linux sets the handler for signal.SIGINT
        # to 0.  This is a bug in wx or gtk.  We fix by just setting it
        # back to the Python default.
        if not callable(signal.getsignal(signal.SIGINT)):
            signal.signal(signal.SIGINT, signal.default_int_handler)

        evtloop = wx.EventLoop()
        ea = wx.EventLoopActivator(evtloop)
        t = clock()
        while not context.input_is_ready():
            while evtloop.Pending():
                t = clock()
                evtloop.Dispatch()
            app.ProcessIdle()
            # We need to sleep at this point to keep the idle CPU load
            # low.  However, if sleep to long, GUI response is poor.  As
            # a compromise, we watch how often GUI events are being processed
            # and switch between a short and long sleep time.  Here are some
            # stats useful in helping to tune this.
            # time    CPU load
            # 0.001   13%
            # 0.005   3%
            # 0.01    1.5%
            # 0.05    0.5%
            used_time = clock() - t
            if used_time > 10.0:
                # print('Sleep for 1 s')  # dbg
                time.sleep(1.0)
            elif used_time > 0.1:
                # Few GUI events coming in, so we can sleep longer
                # print('Sleep for 0.05 s')  # dbg
                time.sleep(0.05)
            else:
                # Many GUI events coming in, so sleep only very little
                time.sleep(0.001)
        del ea
    return 0


@ignore_keyboardinterrupts