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PR #5862 Refs: * pytest-dev/pytest-xdist#620 * https://stackoverflow.com/a/58614689/595220 * https://bugs.python.org/issue35621 * python/cpython#14344 * https://docs.python.org/3/library/asyncio-policy.html#asyncio.MultiLoopChildWatcher Co-authored-by: Sviatoslav Sydorenko <[email protected]> (cherry picked from commit 7080a8b)
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Codecov Report
@@ Coverage Diff @@
## 3.8 #5863 +/- ##
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- Coverage 97.53% 96.75% -0.79%
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Files 44 44
Lines 8844 9851 +1007
Branches 1424 1591 +167
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+ Hits 8626 9531 +905
- Misses 102 182 +80
- Partials 116 138 +22
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This is a backport of PR #5862 as merged into master (7080a8b).
What do these changes do?
Python 3.8 adds a new child watcher class that doesn't require running loop in the main thread: https://docs.python.org/3/library/asyncio-policy.html#asyncio.MultiLoopChildWatcher. This PR uses the new watcher if it is available in asyncio module.
It should reduce test flakiness when parallelized with
pytest-xdist.Are there changes in behavior for the user?
No change for end users. Existing tests in
test_loop.pycovers this change given the current text matrix.Related issue number
#3450
#2075
Checklist
CONTRIBUTORS.txtCHANGESfolder<issue_id>.<type>for example (588.bugfix)issue_idchange it to the pr id after creating the pr.feature: Signifying a new feature..bugfix: Signifying a bug fix..doc: Signifying a documentation improvement..removal: Signifying a deprecation or removal of public API..misc: A ticket has been closed, but it is not of interest to users.