Create method ThreadPoolExecutor#active_count to expose the number of threads that are actively executing tasks #1002
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Connects to #684.
I called it "available" becauseready
means the thread has already been created but is idle, which isn't inclusive of uncreated workers that could still be added to the pool.This exposes the equivalent of the Java ThreadPoolExecutor's
getActiveCount
: "Returns the approximate number of threads that are actively executing tasks."