Sean 904e34d4e6 bpo-24882: Let ThreadPoolExecutor reuse idle threads before creating new thread (#6375) ... * Fixes issue 24882 * Add news file entry for change. * Change test_concurrent_futures.ThreadPoolShutdownTest Adjust the shutdown test so that, after submitting three jobs to the executor, the test checks for less than three threads, instead of looking for exactly three threads. If idle threads are being recycled properly, then we should have less than three threads. * Switched idle count to semaphor, Updated tests As suggested by reviewer tomMoral, swapped lock-protected counter with a semaphore to track the number of unused threads. Adjusted test_threads_terminate to wait for completiton of the previous future before submitting a new one (and checking the number of threads used). Also added a new test to confirm the thread pool can be saturated. * Updates tests as requested by pitrou. * Correct minor whitespace error. * Make test_saturation faster		2019-05-22 23:29:58 +02:00
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futures	bpo-24882: Let ThreadPoolExecutor reuse idle threads before creating new thread (#6375)	2019-05-22 23:29:58 +02:00
__init__.py	…