CODEWITHSUNDEEP
python
Ze Kotch
Ze Kotch

Reputation: 51

Terminate all other threads if one succeeded

Hi I'm trying to allow simultaneous testing of multiple words but I'm facing troubles with multithreading! Is it possible to terminate all other threads if one succeeded? Maybe I don't understand threading correctly! Pretty confused! Here is my code:

def testPass(hash, dname):
   dicFile = open(dname,'r')
   for word in dicFile.readlines():
      word = word.strip('\n')
      t = Thread(target=verifyWord, args=(hash, word))
      t.start()
   return

so I want to do something like if one of the t succeeded exit the loop. I don't know how to handle this.

Upvotes: 1

Views: 302

Answers (2)

sebdelsol
sebdelsol

Reputation: 1085

As suggested use a stop event that you regularly check in verifyWord, and set it when your task is done:

def verifyWord(hash,word,stopevent):

    #for every chunk of your computation, check that stopEvent is not set
    if not self.stopEvent.isSet():
        #do a part of your computation
    ...         

    #When you're done
    self.stopEvent.set()

Break out the for loop, when stopEvent has been set:

def testPass(hash, dname):

    stopEvent = threading.Event()

    dicFile = open(dname,'r')
    for word in dicFile.readlines():
        word = word.strip('\n')
        t = Thread(target=verifyWord, args=(hash, word,stopEvent))
        t.start()

        if stopEvent.isSet():
            break

Upvotes: 0

Henrik
Henrik

Reputation: 4314

Forcing threads to terminate abruptly (i.e. killing them) is generally not a good idea - bad things can happen from a synchronization point of view.

You can achieve what you want by having all your threads checking a flag on a regular basis, telling them to terminate ASAP (but in a safe way) if the flag is set.

This answer should get you going nicely.

Upvotes: 2

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