[3.7] bpo-33694: Fix race condition in asyncio proactor (GH-7498) #7499
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The cancellation of an overlapped WSARecv() has a race condition which causes data loss because of the current implementation of proactor in asyncio. No longer cancel overlapped WSARecv() in _ProactorReadPipeTransport to work around the race condition. Remove the optimized recv_into() implementation to get simple implementation of pause_reading() using the single _pending_data attribute. Move _feed_data_to_bufferred_proto() to protocols.py. Remove set_protocol() method which became useless. (cherry picked from commit 79790bc) Co-authored-by: Victor Stinner <vstinner@redhat.com>
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@vstinner: Backport status check is done, and it's a success ✅ . |
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@vstinner: Backport status check is done, and it's a success ✅ . |
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Thanks, @vstinner! |
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The cancellation of an overlapped WSARecv() has a race condition
which causes data loss because of the current implementation of
proactor in asyncio.
No longer cancel overlapped WSARecv() in _ProactorReadPipeTransport
to work around the race condition.
Remove the optimized recv_into() implementation to get simple
implementation of pause_reading() using the single _pending_data
attribute.
Move _feed_data_to_bufferred_proto() to protocols.py.
Remove set_protocol() method which became useless.
(cherry picked from commit 79790bc)
Co-authored-by: Victor Stinner vstinner@redhat.com
https://bugs.python.org/issue33694