Fix PeriodicTimer_ActiveOperations_TimerRooted test #68805
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There are two problems with this test 1. `WaitForNextTickAsync` may return a synchronously completed task, in which case it does not root the timer, causing our first `WaitForTimerToBeCollected` to fail because the timer was collected. This problem is easily reproduced by adding a small sleep after constructing the `PeriodicTimer` in `Create`, and I believe it is the cause of dotnet#59542. 2. There is no guarantee that the timer is not still rooted after the wait finishes because the returned `ValueTask<bool>` may be keeping it alive. This is unlikely since Roslyn should not extend the lifetime of the `ValueTask<bool>` like this across the await, but I have introduced another method just to be safe. Fix dotnet#59542
ghost
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Tagging subscribers to this area: @mangod9 Issue DetailsThere are two problems with this test
Fix #59542
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stephentoub
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May 3, 2022
src/libraries/System.Runtime/tests/System/Threading/PeriodicTimerTests.cs
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stephentoub
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May 3, 2022
…merTests.cs Co-authored-by: Stephen Toub <stoub@microsoft.com>
danmoseley
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May 3, 2022
src/libraries/System.Runtime/tests/System/Threading/PeriodicTimerTests.cs
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There are two problems with this test
WaitForNextTickAsyncmay return a synchronously completed task, inwhich case it does not root the timer, causing our first
WaitForTimerToBeCollectedto fail because the timer was collected.This problem is easily reproduced by adding a small sleep after
constructing the
PeriodicTimerinCreate, and I believe it is thecause of System.Threading.Tests.PeriodicTimerTests.PeriodicTimer_ActiveOperations_TimerRooted failing in CI #59542.
wait finishes because the returned
ValueTask<bool>may be keepingit alive (although, it seems unlikely Roslyn will extend the lifetime across the
awaitlike this).Fixed by wrapping in another NoInlining method.
Fix #59542