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Title: bpo-30038: fix race condition in signal delivery + wakeup fd by njsmith · Pull Request #1082 · python/cpython · GitHub

Open Graph Title: bpo-30038: fix race condition in signal delivery + wakeup fd by njsmith · Pull Request #1082 · python/cpython

X Title: bpo-30038: fix race condition in signal delivery + wakeup fd by njsmith · Pull Request #1082 · python/cpython

Description: Before, it was possible to get the following sequence of events (especially on Windows, where the C-level signal handler for SIGINT is run in a separate thread): SIGINT arrives trip_signal is called trip_signal writes to the wakeup fd the main thread wakes up from select()-or-equivalent the main thread checks for pending signals, but doesn't see any the main thread drains the wakeup fd the main thread goes back to sleep trip_signal sets is_tripped=1 and calls Py_AddPendingCall to notify the main thread the it should run the Python-level signal handler the main thread doesn't notice because it's asleep This has been causing repeated failures in the Trio test suite: python-trio/trio#119

Open Graph Description: Before, it was possible to get the following sequence of events (especially on Windows, where the C-level signal handler for SIGINT is run in a separate thread): SIGINT arrives trip_signal is call...

X Description: Before, it was possible to get the following sequence of events (especially on Windows, where the C-level signal handler for SIGINT is run in a separate thread): SIGINT arrives trip_signal is call...

Opengraph URL: https://github.com/python/cpython/pull/1082

X: @github

direct link

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e357d5d bpo-30038: fix race condition in signal delivery + wakeup fd njsmith Apr 11, 2017 https://github.com/python/cpython/pull/1082/commits/e357d5dc20627e2688b008675f6f3555aff7db7b
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