From 9801d8a8e43904487eb430d8d11a7517384b2403 Mon Sep 17 00:00:00 2001
From: Stephen Toub <stoub@microsoft.com>
Date: Tue, 5 Jan 2021 13:15:29 -0500
Subject: [PATCH] Remove ThreadStart delegate allocation from
 TryCreateWorkerThread (#46563)

---
 .../src/System/Threading/PortableThreadPool.WorkerThread.cs           | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs b/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs
index c151d9f..e4b574e 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.cs
@@ -27,6 +27,8 @@ namespace System.Threading
                         }
                     });
 
+            private static readonly ThreadStart s_workerThreadStart = WorkerThreadStart;
+
             private static void WorkerThreadStart()
             {
                 Thread.CurrentThread.SetThreadPoolWorkerThreadName();
@@ -290,7 +292,7 @@ namespace System.Threading
                 {
                     // Thread pool threads must start in the default execution context without transferring the context, so
                     // using UnsafeStart() instead of Start()
-                    Thread workerThread = new Thread(WorkerThreadStart);
+                    Thread workerThread = new Thread(s_workerThreadStart);
                     workerThread.IsThreadPoolThread = true;
                     workerThread.IsBackground = true;
                     workerThread.UnsafeStart();
-- 
2.7.4