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ConcurrentQueueSegment allows spinning threads to sleep. #44265

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merged 4 commits into from
Nov 5, 2020
Merged

ConcurrentQueueSegment allows spinning threads to sleep. #44265

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d323143
Allow threads to sleep when ConcurrentQueue has many enqueuers/dequeu…
alexcovington Nov 4, 2020
781dc6b
Merge branch 'master' of https://github.com/dotnet/runtime into cq-sp…
Nov 4, 2020
14fb73d
Update src/libraries/System.Private.CoreLib/src/System/Collections/Co…
alexcovington Nov 5, 2020
729d646
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alexcovington Nov 5, 2020
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9 changes: 6 additions & 3 deletions ...raries/System.Private.CoreLib/src/System/Collections/Concurrent/ConcurrentQueueSegment.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,9 @@ internal sealed class ConcurrentQueueSegment<T>
internal ConcurrentQueueSegment<T>? _nextSegment; // SOS's ThreadPool command depends on this name
#pragma warning restore 0649

/// <summary>Threshold to spin before allowing threads to sleep when there is contention.</summary>
private const int Sleep1Threshold = 8;

/// <summary>Creates the segment.</summary>
/// <param name="boundedLength">
/// The maximum number of elements the segment can contain. Must be a power of 2.
Expand Down Expand Up @@ -183,7 +186,7 @@ public bool TryDequeue([MaybeNullWhen(false)] out T item)
}

// Lost a race. Spin a bit, then try again.
spinner.SpinOnce(sleep1Threshold: -1);
spinner.SpinOnce(Sleep1Threshold);
}
}

Expand Down Expand Up @@ -244,7 +247,7 @@ public bool TryPeek([MaybeNullWhen(false)] out T result, bool resultUsed)
}

// Lost a race. Spin a bit, then try again.
spinner.SpinOnce(sleep1Threshold: -1);
spinner.SpinOnce(Sleep1Threshold);
}
}

Expand Down Expand Up @@ -301,7 +304,7 @@ public bool TryEnqueue(T item)
}

// Lost a race. Spin a bit, then try again.
spinner.SpinOnce(sleep1Threshold: -1);
spinner.SpinOnce(Sleep1Threshold);
}
}

Expand Down