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Title: [3.6] bpo-30038: fix race condition in signal delivery + wakeup fd (#1082) by vstinner · Pull Request #2075 · python/cpython · GitHub

Open Graph Title: [3.6] bpo-30038: fix race condition in signal delivery + wakeup fd (#1082) by vstinner · Pull Request #2075 · python/cpython

X Title: [3.6] bpo-30038: fix race condition in signal delivery + wakeup fd (#1082) by vstinner · Pull Request #2075 · 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 (cherry picked from commit 4ae0149)

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/2075

X: @github

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[3.6] bpo-30038: fix race condition in signal delivery + wakeup fd (#1082) https://github.com/python/cpython/pull/2075/files#top
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0bbb8f4 bpo-30038: fix race condition in signal delivery + wakeup fd (#1082) njsmith May 16, 2017 https://github.com/python/cpython/pull/2075/commits/0bbb8f42788fb34dfd7d09caa71d80885af0bd93
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