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Cleanup named mutex tests #117128

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Merged
merged 3 commits into from
Jun 30, 2025
Merged

Cleanup named mutex tests #117128

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59ad4fc
Cleanup named mutex tests
jkotas Jun 29, 2025
6bd5c8e
Update src/libraries/System.Threading/tests/MutexTests.cs
jkotas Jun 30, 2025
8f2691b
Update src/libraries/System.Threading/tests/MutexTests.cs
jkotas Jun 30, 2025
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36 changes: 29 additions & 7 deletions src/libraries/System.Threading/tests/MutexTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,26 @@ namespace System.Threading.Tests
{
public class MutexTests : FileCleanupTestBase
{
private static bool IsCrossProcessNamedMutexSupported
{
get
{
if (PlatformDetection.IsWindows)
return true;

// Mobile platforms are constrained environments
if (PlatformDetection.IsMobile)
return false;

// Cross-process named mutex support is not implemented on NativeAOT and Mono
// [ActiveIssue("https://github.com/dotnet/runtime/issues/48720")]
if (PlatformDetection.IsMonoRuntime || PlatformDetection.IsNativeAot)
return false;

return true;
}
}

[Fact]
public void ConstructorAndDisposeTest()
{
Expand Down Expand Up @@ -225,9 +245,7 @@ public void MutualExclusionTest()
m.ReleaseMutex();
}

[Fact]
[ActiveIssue("https://github.com/mono/mono/issues/15159", TestRuntimes.Mono)]
[ActiveIssue("https://github.com/dotnet/runtime/issues/70127", typeof(PlatformDetection), nameof(PlatformDetection.IsNativeAot))]
[ConditionalFact(nameof(IsCrossProcessNamedMutexSupported))]
[PlatformSpecific(TestPlatforms.AnyUnix)]
public void Ctor_InvalidNames_Unix()
{
Expand Down Expand Up @@ -344,7 +362,6 @@ public void OpenExisting(string name)
}

[Fact]
[ActiveIssue("https://github.com/mono/mono/issues/15158", TestRuntimes.Mono)]
public void OpenExisting_InvalidNames()
{
AssertExtensions.Throws<ArgumentNullException>("name", () => Mutex.OpenExisting(null, options: default));
Expand Down Expand Up @@ -769,8 +786,10 @@ public void AbandonExisting(
});
}

[ConditionalTheory(typeof(RemoteExecutor), nameof(RemoteExecutor.IsSupported))]
[ActiveIssue("https://github.com/dotnet/runtime/issues/36307", TestRuntimes.Mono)]
private static bool IsRemoteExecutorAndCrossProcessNamedMutexSupported =>
RemoteExecutor.IsSupported && IsCrossProcessNamedMutexSupported;

[ConditionalTheory(nameof(IsRemoteExecutorAndCrossProcessNamedMutexSupported))]
[MemberData(nameof(NameOptionCombinations_MemberData))]
public void CrossProcess_NamedMutex_ProtectedFileAccessAtomic(bool currentUserOnly, bool currentSessionOnly)
{
Expand Down Expand Up @@ -956,7 +975,10 @@ public static TheoryData<string> GetValidNames()
{
var names = new TheoryData<string>() { Guid.NewGuid().ToString("N") };

if (PlatformDetection.IsWindows)
// Windows native named mutexes and in-proc named mutexes support very long (1000+ char) names.
// Non-Windows cross-process named mutexes are emulated using file system. It imposes limit
// on maximum name length.
if (PlatformDetection.IsWindows || !IsCrossProcessNamedMutexSupported)
names.Add(Guid.NewGuid().ToString("N") + new string('a', 1000));

return names;
Expand Down
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