[test] Make Mutex.cpp unittest more reliable. #25049
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Many of these tests would fail if one of the test threads didn't begin execution within 100 milliseconds. They would hit while (!done) the very first time and never execute the loop body. That does happen from time to time, and the result would be a spurious failure. Change the loops to do {} while(!done) to ensure they always execute at least one iteration.
Many tests also had the test threads concurrently write results to a std::vector, which appeared to be causing some failures in my local testing when I had extra sleeps inserted to simulate pathological scheduling. Change the results vectors to be vectors of std::atomic to ensure that this concurrent writing is safe.
These changes shouldn't affect its ability to test the functionality it intends to test.
rdar://problem/49386389
(cherry picked from commit 6172f72)
The restrictions on std::atomic make a it fragile to have a vector of them, and this failed to compile on Linux in CI. While I'm in there, clean up a couple of tests that repeated a raw `10` for the thread count. rdar://problem/49709062 (cherry picked from commit 855dd8d)
|
@swift-ci test |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
We have started to hit some spurious failures in package testing on 5.1 from these tests. This was happening on master as well pretty regularly until MikeA tweaked the tests to make them more reliable. This PR just cherry-picks these two test modifications to 5.1 to stabilize the tests there as well.
rdar://51093916