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Check if the Main Thread is still alive from another thread

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

like image 495
Dan Barzilay Avatar asked May 03 '14 09:05

Dan Barzilay


1 Answers

  • 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.

like image 112
Raghav RV Avatar answered Nov 09 '22 05:11

Raghav RV