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[Test] For named mutexes, check if Windows Nano Server uses different namespaces when using Local\ and Global\ prefixes #112266

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[Test] For named mutexes, check if Windows Nano Server uses different namespaces when using Local\ and Global\ prefixes #112266

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28 changes: 28 additions & 0 deletions src/libraries/System.Threading/tests/MutexTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using Microsoft.DotNet.RemoteExecutor;
using Microsoft.Win32.SafeHandles;
using Xunit;

namespace System.Threading.Tests
Expand Down Expand Up @@ -758,6 +759,30 @@ public void NamedMutex_DisposeWhenLockedRaceTest()
}
}

[Fact]
[PlatformSpecific(TestPlatforms.Windows)]
public void CheckWhichWindowsVersionsDistinguishLocalAndGlobalNamespaces()
{
const int MAXIMUM_ALLOWED = 0x02000000;
const int SYNCHRONIZE = 0x00100000;
const int MUTEX_MODIFY_STATE = 0x00000001;
const int MutexAccessRights = MAXIMUM_ALLOWED | SYNCHRONIZE | MUTEX_MODIFY_STATE;

const int ERROR_ALREADY_EXISTS = 0xB7;

string name = Guid.NewGuid().ToString("N");

using SafeWaitHandle m = CreateMutexEx(lpMutexAttributes: 0, @"Local\" + name, flags: 0, MutexAccessRights);
int errorCode = Marshal.GetLastPInvokeError();
Assert.False(m.IsInvalid);
Assert.NotEqual(ERROR_ALREADY_EXISTS, errorCode);

using SafeWaitHandle m2 = CreateMutexEx(lpMutexAttributes: 0, @"Global\" + name, flags: 0, MutexAccessRights);
errorCode = Marshal.GetLastPInvokeError();
Assert.False(m2.IsInvalid);
Assert.NotEqual(ERROR_ALREADY_EXISTS, errorCode);
}

public static TheoryData<string> GetValidNames()
{
var names = new TheoryData<string>() { Guid.NewGuid().ToString("N") };
Expand All @@ -768,6 +793,9 @@ public static TheoryData<string> GetValidNames()
return names;
}

[DllImport("kernel32.dll", EntryPoint = "CreateMutexExW", SetLastError = true, CharSet = CharSet.Unicode)]
private static extern SafeWaitHandle CreateMutexEx(nint lpMutexAttributes, string? name, uint flags, uint desiredAccess);

[DllImport("kernel32.dll")]
private static extern IntPtr GetCurrentThread();

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