Implement APIs for some threading metrics (CoreCLR) (#24113)

Implement APIs for some threading metrics (CoreCLR)

API review: https://github.com/dotnet/corefx/issues/35500

2 files changed, 39 insertions, 0 deletions

diff --git a/src/System.Private.CoreLib/src/System/Threading/Monitor.cs b/src/System.Private.CoreLib/src/System/Threading/Monitor.cs
index 2701b3b555..cb3a0f61d5 100644
--- a/src/System.Private.CoreLib/src/System/Threading/Monitor.cs
+++ b/src/System.Private.CoreLib/src/System/Threading/Monitor.cs
@@ -233,5 +233,14 @@ namespace System.Threading
 
             ObjPulseAll(obj);
         }
+
+        /// <summary>
+        /// Gets the number of times there was contention upon trying to take a <see cref="Monitor"/>'s lock so far.
+        /// </summary>
+        public static extern long LockContentionCount
+        {
+            [MethodImpl(MethodImplOptions.InternalCall)]
+            get;
+        }
     }
 }
diff --git a/src/System.Private.CoreLib/src/System/Threading/ThreadPool.CoreCLR.cs b/src/System.Private.CoreLib/src/System/Threading/ThreadPool.CoreCLR.cs
index 89030787ed..76eb2db0ad 100644
--- a/src/System.Private.CoreLib/src/System/Threading/ThreadPool.CoreCLR.cs
+++ b/src/System.Private.CoreLib/src/System/Threading/ThreadPool.CoreCLR.cs
@@ -231,6 +231,36 @@ namespace System.Threading
             GetAvailableThreadsNative(out workerThreads, out completionPortThreads);
         }
 
+        /// <summary>
+        /// Gets the number of thread pool threads that currently exist.
+        /// </summary>
+        /// <remarks>
+        /// For a thread pool implementation that may have different types of threads, the count includes all types.
+        /// </remarks>
+        public static extern int ThreadCount
+        {
+            [MethodImpl(MethodImplOptions.InternalCall)]
+            get;
+        }
+
+        /// <summary>
+        /// Gets the number of work items that have been processed so far.
+        /// </summary>
+        /// <remarks>
+        /// For a thread pool implementation that may have different types of work items, the count includes all types.
+        /// </remarks>
+        public static extern long CompletedWorkItemCount
+        {
+            [MethodImpl(MethodImplOptions.InternalCall)]
+            get;
+        }
+
+        private static extern long PendingUnmanagedWorkItemCount
+        {
+            [MethodImpl(MethodImplOptions.InternalCall)]
+            get;
+        }
+
         private static RegisteredWaitHandle RegisterWaitForSingleObject(  // throws RegisterWaitException
              WaitHandle waitObject,
              WaitOrTimerCallback callBack,