concurrencytest | Python testtools extension

by cgoldberg Python Version: Current License: No License

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Python testtools extension for running unittest suites concurrently.

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Community Discussions

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multithreaded python program doesn't execute threaded function

Why JMM produces (0, 0) even though it is considered a forbidden result

Concurrency - Conditional synchronized method

QUESTION

multithreaded python program doesn't execute threaded function

Asked 2020-Aug-05 at 18:18

Im inexperienced at threading in python and was trying to make a few simple mulithreaded programs to get a bit more experience. I'm trying to send requests out to a pre-defined list of URLs.

When trying to execute the program, it instantly finishes and prints("End") with no exits or exceptions. the print call placed in the thread_function doesn't execute and no errors are thrown.

Any help would be appreciated.

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ANSWER

Answered 2020-Aug-05 at 16:39

If you want to use concurrent.futures

You never pass any iterables to .map(), so nothing gets done. To simplify the stuff you have (you don't need any of the locks either):

Source https://stackoverflow.com/questions/63269540

QUESTION

Why JMM produces (0, 0) even though it is considered a forbidden result

Asked 2020-Jul-24 at 23:14

I am checking some statements from JMM and I wrote a JCS test like this:

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ANSWER

Answered 2020-Jul-24 at 23:14

Let's change the code a little bit to begin with:

Source https://stackoverflow.com/questions/63050742

QUESTION

Concurrency - Conditional synchronized method

Asked 2020-Mar-19 at 19:10

I am reading two text files concurrently line by line.

What I am specifically want to do is when the lineCount on each thread are the same I want to take a look at the string that the scanner is currently reading.

I looked around for certain pattern I can implement like Compare and Swap and Slipped Condition but I cannot wrap my head around how it would help me achieve my goal. I am new to concurrency programming.

What I have managed so far is to synchronize the string reading and printing with counterSync method and I know that I have carry out my thread lock/pause operation there and take a look at the string.

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ANSWER

Answered 2020-Mar-19 at 15:01

It seems that you didn't post a complete example. But, a few general comments:

You might be able to get away with using "compare-and-swap" logic for an integer, but you should not expect it to work for a more-sophisticated thing like a Java "String" or any sort of container.

You should simply use the synchronization-objects provided in the language. If you are going to update or even to examine a shared data structure, you must be holding the proper lock.

Of course, "thread-safe queues" are very helpful in many designs because they facilitate the most-common activity – message-passing – and allow the various threads to operate graciously at slightly-varying speeds. You still have to lock anything that's shared, but nonetheless it's a useful design that's really as old as the Unix® "pipe."

Source https://stackoverflow.com/questions/60759643

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