python - 停止Python中的线程

Question

Python中有没有办法停止线程？我有一个 GUI，其方法可以播放 10 秒音频文件并连续向 GUI 窗口发送信息

我使用多线程，因为我不希望 GUI 在文件播放时卡住。我可以使用当前代码停止线程，但需要一段时间

我的代码看起来像这样:

class MyThread(threading.Thread):
   """Thread class with a stop() method. The thread itself has to check
    regularly for the stopped() condition."""

    def __init__(self, *args, **kwargs):
        super(MyThread, self).__init__(*args, **kwargs)
        self._stop = threading.Event()

    def stop(self):
        self._stop.set()

    def stopped(self):
        return self._stop.isSet()


 class Myplayer: 

   // GUI CODE


    def play_button(self, widget):
        self.mythread = MyThread(target=self.practice)
        self.mythread.start()

    def stop_button(self, widget):
         if self.mythead.IsAlive:
            self.self.stop()



    def mplayer(self):
        while not self.mythread.stopped:
        gobject.idle_add(self.insert_text, "\nPlaying a new file")
        subprocess.call(["timidity", "myfile.mid"])

Answer 1

假设您想在线程停止时中断正在播放的 midi 文件，则可以使用 Popen 而不是 call 更快地停止线程，然后循环等待进程完成或停止请求传入:

class MyThread(threading.Thread):
   """Thread class with a stop() method. The thread itself has to check
    regularly for the stopped() condition."""

    def __init__(self, *args, **kwargs):
        super(MyThread, self).__init__(*args, **kwargs)
        self._stop = threading.Event()

    def stop(self):
        self._stop.set()

    def stopped(self):
        return self._stop.isSet()

    def run(self):
        while not self.stopped:
           gobject.idle_add(self.insert_text, "\nPlaying a new file")
           p = subprocess.Popen(["timidity", "myfile.mid"])
           while p.poll() is None: # This will loop until the process has exited.
               if self.stopped:
                   # Someone set the stop flag. Kill the process and exit
                   p.terminate()
                   p.join()
                   return
               time.sleep(.1) # Sleep briefly so we don't hog CPU cycles