gen: Expliclty track contextvars, fixing contextvars.reset#2938
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bdarnell merged 1 commit intotornadoweb:masterfrom Oct 20, 2020
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gen: Expliclty track contextvars, fixing contextvars.reset#2938bdarnell merged 1 commit intotornadoweb:masterfrom
bdarnell merged 1 commit intotornadoweb:masterfrom
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The asyncio event loop provides enough contextvars support out of the box for basic contextvars functionality to work in tornado coroutines, but not `contextvars.reset`. Prior to this change, each yield created a new "level" of context, when an entire coroutine should be on the same level. This is necessary for the reset method to work. Fixes tornadoweb#2731
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The asyncio event loop provides enough contextvars support out of the
box for basic contextvars functionality to work in tornado coroutines,
but not
contextvars.reset. Prior to this change, each yield createda new "level" of context, when an entire coroutine should be on the
same level. This is necessary for the reset method to work.
Fixes #2731