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pythonmultithreadinglockingmultiprocessing
Ram Rachum
Ram Rachum

Reputation: 88578

Python: Locks from `threading` and `multiprocessing` interchangable?

Are the locks from the threading module interchangeable with those from the multiprocessing module?

Upvotes: 7

Views: 2501

Answers (3)

jnoller
jnoller

Reputation: 1179

You can typically use the two interchangeably, but you need to cognizant of the differences. For example, multiprocessing.Event is backed by a named semaphore, which is sensitive to the platform under the application.

Multiprocessing.Lock is backed by Multiprocessing.SemLock - so it needs named semaphores. In essence, you can use them interchangeably, but using multiprocessing's locks introduces some platform requirements on the application (namely, it doesn't run on BSD :))

Upvotes: 8

rmmh
rmmh

Reputation: 7095

Yes, you can use locks from the multiprocessing module as normal in your one-process application, but if you're using multiprocessing, you should use its locks.

Upvotes: 1

Unknown
Unknown

Reputation: 46781

I don't think so. Threading locks are within the same process, while the multiprocessing lock would likely be in shared memory.

Last time I checked, multiprocessing doesn't allow you to share the lock in a Queue, which is a threading lock.

Upvotes: 1

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