检查主线程是否仍在另一个线程中 [英] Check if the Main Thread is still alive from another thread

问题描述

如何检查主线程是否从另一个(非守护进程，子线程)线程中恢复运行?

子线程是非守护线程，我想检查主线程是否仍在运行，并根据结果停止该非守护线程.

(使线程守护程序不适用于我的情况，因为我的线程写入 stdout ，当将线程设置为守护程序时会产生问题)

使用python 2.7

解决方案

• 对于Python 2.7，您可以尝试以下操作:

  for i in threading.enumerate():
     if i.name == "MainThread":
         print i.is_alive()
  

  不建议在函数名称中使用小写驼峰，因此您应该使用i.is_alive()而不是i.isAlive().

• 如果您喜欢单线，请尝试以下操作:

  is_main_thread_active = lambda : any((i.name == "MainThread") and i.is_alive() for i in threading.enumerate())
  

  然后调用is_main_thread_active()以检查主线程是否处于活动状态.

  但是，一次使用，您可以直接使用它而无需创建函数.

  any((i.name == "MainThread") and i.is_alive() for i in threading.enumerate())

• 检查此页面以获取有关线程化的更多信息.

p>

• 在python 3.4中，存在一个专用函数来返回主线程，因此您可以使用此衬套查看您的主线程是否仍然存在..

  threading.main_thread().is_alive()
  

希望这对您有所帮助.

How can I check if the Main Thread is alive from another ( non-daemon, child ) thread?

The child thread is a non-daemon thread and I'd like to check if the Main thread is still running or not, and stop this non-daemon thread based on the result.

( Making the thread daemon is not good for my situation because my thread writes to stdout which creates problems when the thread is set as a daemon)

Using python 2.7

解决方案

• For Python 2.7 you can try this:

  for i in threading.enumerate():
     if i.name == "MainThread":
         print i.is_alive()
  

  The usage of lower camel case in function names is deprecated and so you should be using i.is_alive() instead of i.isAlive().

• If you like one-liners try this:

  is_main_thread_active = lambda : any((i.name == "MainThread") and i.is_alive() for i in threading.enumerate())
  

  Then call is_main_thread_active() to check if the Main Thread is active.

  For one time use, however, you could use this directly without creating a function.

  any((i.name == "MainThread") and i.is_alive() for i in threading.enumerate())

• Check this page for more info about threading.

• In python 3.4 a dedicated function to return the main thread exists and so you can use this one liner to see if your main thread is still alive..

  threading.main_thread().is_alive()
  

Hope this helps you.

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