CODEWITHSUNDEEP
pythonpython-multithreading
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Reputation: 4695

Python pause thread execution

Is there a way to "pause" the main python thread of an application perminantly?

I have some code that fires off two threads

class start():
    def __init__(self):
        Thread1= functions.threads.Thread1()
        Thread1.setDaemon(True)
        Thread1.start()
        Thread2= functions.threads.Thread2()
        Thread2.setDaemon(True)
        Thread2.start()

        #Stop thread here

At the moment, when the program gets to the end of that function it exits (There is nothing else for the main thread to do after that), killing the threads which run infinately (Looping). How do I stop the main process from exiting? I can do it with a while True: None loop but that uses a lot of CPU and there's probably a better way.

Upvotes: 1

Views: 1670

Answers (3)

Thomas K
Thomas K

Reputation: 40330

If you don't do setDaemon(True) on the threads, the process will keep running as long as the threads run for.

The daemon flag indicates that the interpreter needn't wait for a thread. It will exit when only daemon threads are left.

Upvotes: 4

Xion
Xion

Reputation: 22770

The whole point of daemon threads is to not prevent the application from being terminated if any of them is still running. You obviously want your threads to keep the application process alive, so don't make them daemons.

Upvotes: 4

unutbu
unutbu

Reputation: 879113

Use join:

Thread1.join()
Thread2.join()

Also note that setDaemon is the old API. 

Thread1.daemon = True

is the preferred way now.

Upvotes: 4

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