[3.12] gh-110205: Fix asyncio ThreadedChildWatcher._join_threads() (GH-110884)#111412
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ThreadedChildWatcher.close()is now officially a no-op;_join_threads()never did anything.asyncio-waitpid-NNN.test.test_asyncio.utils.TestCase.close_loop()now waits for the child watcher's threads, but not forever; if a thread hangs, it raisesRuntimeError.(cherry picked from commit c3bb10c)
Co-authored-by: Guido van Rossum [email protected]