Question

以下代码有什么问题吗？运行类似的代码我得到一个死锁，如果主线程试图获取锁定的锁，循环不会重新锁定它。

另外，由于我不能在没有＆＃34;添加更多细节和＃34;的情况下发布，在这种情况下会有什么好的细节？

import Tkinter
import threading
from time import sleep
from random import random

class Test(Tkinter.Tk):

    def __init__(self, parent):
        Tkinter.Tk.__init__(self, parent)
        self.resizable(False, False)
        self.grid()
        self._button = Tkinter.Button(self, text='Click me', command=self._foo)
        self._button.grid(column=0, row=0)
        self._lock = threading.Lock()

    def __enter__(self):
        self._loopRunning = True
        self._loopThread = threading.Thread(target=self._loop)
        self._loopThread.start()
        return self

    def __exit__(self, exc_type, exc_val, traceback):
        self._loopRunning = False
        self._loopThread.join()
        return False

    def _loop(self):
        while self._loopRunning:
            print 'loop wants lock'
            with self._lock:
                print 'loop acquired lock'
                self._button.configure()
                sleep(random())
                print 'loop should release lock'
            print 'loop released lock'
            sleep(1)

    def _foo(self):
        print 'foo wants lock'
        with self._lock:
            print 'foo acquired lock'
            self._button.configure()
            sleep(random())
            print 'foo should release lock'
        print 'foo released lock'
        sleep(1)

if __name__ == '__main__':
    with Test(None) as test:
        test.mainloop()

Answer 1

Tkinter不是线程安全的。使用队列进行Tkinter操作或使用线程安全版本mtTkinter（http://tkinter.unpythonic.net/wiki/mtTkinter）代替。（我和mtTkinter一起去了。）

抱歉没有充分考虑以前提出的问题。之前已经解决了这个问题，例如于：

Threaded Tkinter script crashes when creating the second Toplevel widget

Possible locking issue in Tkinter application

Tkinter: How to use threads to preventing main event loop from "freezing"

TkInter死锁

1 个答案: