worker: fix deadlock when calling terminate from exit handler #22073
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Just before we call the `'exit'` handlers of a Worker, we drain the public port’s message queue to ensure proper ordering. Previously, we held the Worker’s `mutex_` during the exit handler call, so calling `terminate()` on the worker could lead to a deadlock if called from one of those message handlers. This fixes flakiness in the `parallel/test-worker-dns-terminate` test.
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This was referenced Aug 16, 2018
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Just before we call the
'exit'handlers of a Worker, we drainthe public port’s message queue to ensure proper ordering.
Previously, we held the Worker’s
mutex_during theexit handler call, so calling
terminate()on the workercould lead to a deadlock if called from one of those message
handlers.
This fixes flakiness in the
parallel/test-worker-dns-terminatetest.Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes