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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Multiprocessing Test Issue - signal.set_wakeup_fd errors","articleBody":"## Summary\nWhen running the `test_multiprocessing_*` suite, there are differences in test output that, while not impeding the tests, are output while running the suite, but are in CPython. \n\n## Details\nFor some tests, this error is popping up:\n```\nException ignored in: \u003cfunction on_fork at 0x5607124ce900\u003e\nException ignored in: \u003cfunction on_fork at 0x5607124ce900\u003e\nException ignored in: \u003cfunction on_fork at 0x5607124ce900\u003e\n  File \"RustPython/crates/pylib/Lib/asyncio/events.py\", line 880, in on_fork\n    signal.set_wakeup_fd(-1)\n                          ^\nValueError: signal only works in main thread\n  File \"RustPython/crates/pylib/Lib/asyncio/events.py\", line 880, in on_fork\n    signal.set_wakeup_fd(-1)\n                          ^\nValueError: signal only works in main thread\n  File \"RustPython/crates/pylib/Lib/asyncio/events.py\", line 880, in on_fork\n    signal.set_wakeup_fd(-1)\n                          ^\nValueError: signal only works in main thread\n```\n\nThese tests include (but are not limited to):\n * `test.test_multiprocessing_fork.test_manager.WithManagerTestPool.test_async_timeout`\n * `test.test_multiprocessing_fork.test_manager.WithManagerTestPool.test_empty_iterable`\n * `test.test_multiprocessing_fork.test_manager.WithManagerTestPool.test_map_no_failfast`\n * `test.test_multiprocessing_fork.test_manager.WithManagerTestPool.test_terminate`\n * `test.test_multiprocessing_fork.test_manager.WithManagerTestPool.test_wrapped_exception`\n","author":{"url":"https://github.com/terryluan12","@type":"Person","name":"terryluan12"},"datePublished":"2026-01-10T16:21:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/6700/RustPython/issues/6700"}