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Skip CooperativeBlockingCanCreateThreadsFaster on Debug runtimes #131834

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Merged
VSadov merged 2 commits into from
Aug 6, 2026
+5 −1
Merged

Skip CooperativeBlockingCanCreateThreadsFaster on Debug runtimes #131834

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6ac6035
Initial plan
Copilot Aug 4, 2026
db5d361
Disable CooperativeBlockingCanCreateThreadsFaster on Debug runtime
Copilot Aug 4, 2026
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6 changes: 5 additions & 1 deletion src/libraries/System.Threading.ThreadPool/tests/ThreadPoolTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -913,7 +913,7 @@ public static void ThreadPoolThreadCreationDoesNotTransferExecutionContext()
}).Dispose();
}

[ConditionalFact(typeof(ThreadPoolTests), nameof(IsThreadingAndRemoteExecutorSupported))]
[ConditionalFact(typeof(ThreadPoolTests), nameof(IsThreadingAndRemoteExecutorSupportedAndNotDebugRuntime))]
public static void CooperativeBlockingCanCreateThreadsFaster()
{
// Run in a separate process to test in a clean thread pool environment such that work items queued by the test
Expand Down Expand Up @@ -1501,6 +1501,10 @@ public static unsafe void ThreadPoolCompletedWorkItemCountTest()
public static bool IsThreadingAndRemoteExecutorSupported =>
PlatformDetection.IsMultithreadingSupported && RemoteExecutor.IsSupported;

// Timing-sensitive tests can be too flaky on a Debug runtime, which is much slower
public static bool IsThreadingAndRemoteExecutorSupportedAndNotDebugRuntime =>
IsThreadingAndRemoteExecutorSupported && !PlatformDetection.IsDebugRuntime;

private static bool GetUseWindowsThreadPool()
{
AppContext.TryGetSwitch("System.Threading.ThreadPool.UseWindowsThreadPool", out bool useWindowsThreadPool);
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