当图标被加载并且 tk.mainloop 在线程中时，Tkinter 锁定 Python
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Tkinter locks Python when an icon is loaded and tk.mainloop is in a thread
提问by burito
Here's the test case...
这是测试用例...
import Tkinter as tk
import thread
from time import sleep
if __name__ == '__main__':
t = tk.Tk()
thread.start_new_thread(t.mainloop, ())
# t.iconbitmap('icon.ico')
b = tk.Button(text='test', command=exit)
b.grid(row=0)
while 1:
sleep(1)
This code works. Uncomment the t.iconbitmap line and it locks. Re-arrange it any way you like; it will lock.
此代码有效。取消注释 t.iconbitmap 行并锁定。以您喜欢的任何方式重新安排它；它会锁定。
How do I prevent tk.mainloop locking the GILwhen there is an icon present?
当存在图标时，如何防止 tk.mainloop 锁定GIL？
The target is win32 and Python 2.6.2.
目标是 win32 和 Python 2.6.2。
回答by codeape
I believe you should not execute the main loop on a different thread. AFAIK, the main loop should be executed on the same thread that created the widget.
我相信你不应该在不同的线程上执行主循环。AFAIK，主循环应该在创建小部件的同一线程上执行。
The GUI toolkits that I am familiar with (Tkinter, .NET Windows Forms) are that way: You can manipulate the GUI from one thread only.
我熟悉的 GUI 工具包（Tkinter、.NET Windows 窗体）是这样的：您只能从一个线程操作 GUI。
On Linux, your code raises an exception:
在 Linux 上，您的代码引发异常：
self.tk.mainloop(n) RuntimeError: Calling Tcl from different appartment
One of the following will work (no extra threads):
以下之一将起作用（没有额外的线程）：
if __name__ == '__main__':
t = tk.Tk()
t.iconbitmap('icon.ico')
b = tk.Button(text='test', command=exit)
b.grid(row=0)
t.mainloop()
With extra thread:
带有额外的线程：
def threadmain():
t = tk.Tk()
t.iconbitmap('icon.ico')
b = tk.Button(text='test', command=exit)
b.grid(row=0)
t.mainloop()
if __name__ == '__main__':
thread.start_new_thread(threadmain, ())
while 1:
sleep(1)
If you need to do communicate with tkinter from outside the tkinter thread, I suggest you set up a timer that checks a queue for work.
如果您需要从 tkinter 线程外部与 tkinter 进行通信，我建议您设置一个计时器来检查工作队列。
Here is an example:
下面是一个例子：
import Tkinter as tk
import thread
from time import sleep
import Queue
request_queue = Queue.Queue()
result_queue = Queue.Queue()
def submit_to_tkinter(callable, *args, **kwargs):
request_queue.put((callable, args, kwargs))
return result_queue.get()
t = None
def threadmain():
global t
def timertick():
try:
callable, args, kwargs = request_queue.get_nowait()
except Queue.Empty:
pass
else:
print "something in queue"
retval = callable(*args, **kwargs)
result_queue.put(retval)
t.after(500, timertick)
t = tk.Tk()
t.configure(width=640, height=480)
b = tk.Button(text='test', name='button', command=exit)
b.place(x=0, y=0)
timertick()
t.mainloop()
def foo():
t.title("Hello world")
def bar(button_text):
t.children["button"].configure(text=button_text)
def get_button_text():
return t.children["button"]["text"]
if __name__ == '__main__':
thread.start_new_thread(threadmain, ())
trigger = 0
while 1:
trigger += 1
if trigger == 3:
submit_to_tkinter(foo)
if trigger == 5:
submit_to_tkinter(bar, "changed")
if trigger == 7:
print submit_to_tkinter(get_button_text)
sleep(1)
