Expose Thread.GetCurrentProcessorId() (#27541)

Fixes #16767

Author: jkotas

src/System.Threading.Thread/ref/System.Threading.Thread.cs

@@ -65,6 +65,7 @@ public static void FreeNamedDataSlot(string name) { }
         public System.Threading.ApartmentState GetApartmentState() { throw null; }
         [System.ObsoleteAttribute("Thread.GetCompressedStack is no longer supported. Please use the System.Threading.CompressedStack class")]
         public System.Threading.CompressedStack GetCompressedStack() { throw null; }
+        public static int GetCurrentProcessorId() { throw null; }
         public static object GetData(System.LocalDataStoreSlot slot) { throw null; }
         public static System.AppDomain GetDomain() { throw null; }
         public static int GetDomainID() { throw null; }

src/System.Threading.Thread/src/System/Threading/Thread.cs

@@ -272,6 +272,7 @@ public void SetCompressedStack(CompressedStack stack)
             throw new InvalidOperationException(SR.Thread_GetSetCompressedStack_NotSupported);
         }
 
+        public static int GetCurrentProcessorId() => RuntimeThread.GetCurrentProcessorId();
         public static AppDomain GetDomain() => AppDomain.CurrentDomain;
         public static int GetDomainID() => GetDomain().Id;
         public override int GetHashCode() => ManagedThreadId;

src/System.Threading.Thread/tests/Configurations.props

@@ -3,6 +3,8 @@
   <PropertyGroup>
     <BuildConfigurations>
       netstandard;
+      netcoreapp;
+      uap;
     </BuildConfigurations>
   </PropertyGroup>
 </Project>

src/System.Threading.Thread/tests/System.Threading.Thread.Tests.csproj

@@ -7,12 +7,19 @@
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard-Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard-Release|AnyCPU'" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netcoreapp-Debug|AnyCPU'" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netcoreapp-Release|AnyCPU'" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='uap-Debug|AnyCPU'" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='uap-Release|AnyCPU'" />
   <ItemGroup>
     <Compile Include="CompressedStackTests.cs" />
     <Compile Include="ExceptionTests.cs" />
     <Compile Include="ThreadExceptionEventArgsTests.cs" />
     <Compile Include="ThreadTests.cs" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetGroup)' != 'netstandard'">
+    <Compile Include="ThreadTests.netcoreapp.cs" />
+  </ItemGroup>
   <ItemGroup>
     <Compile Include="$(CommonTestPath)\System\Threading\ThreadTestHelpers.cs">
       <Link>CommonTest\System\Threading\ThreadPoolHelpers.cs</Link>

src/System.Threading.Thread/tests/ThreadTests.cs

@@ -18,7 +18,7 @@ public class DummyClass : RemoteExecutorTestBase
         public static string HostRunnerTest = HostRunner;
     }
 
-    public static class ThreadTests 
+    public static partial class ThreadTests 
     {
         private const int UnexpectedTimeoutMilliseconds = ThreadTestHelpers.UnexpectedTimeoutMilliseconds;
         private const int ExpectedTimeoutMilliseconds = ThreadTestHelpers.ExpectedTimeoutMilliseconds;

src/System.Threading.Thread/tests/ThreadTests.netcoreapp.cs

@@ -0,0 +1,16 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Xunit;
+
+namespace System.Threading.Threads.Tests
+{
+    public static partial class ThreadTests
+    {
+        public static void GetCurrentProcessorId()
+        {
+            Assert.True(Thread.GetCurrentProcessorId() >= 0);
+        }
+    }
+}