Moving ConcurrentQueue to shared folder (#17956)

* Moving ConcurrentQueue to shared folder

Fixes: #17751

1 files changed, 26 insertions, 0 deletions

diff --git a/src/System.Private.CoreLib/shared/Internal/Padding.cs b/src/System.Private.CoreLib/shared/Internal/Padding.cs
new file mode 100644
index 0000000000..14bf998bab
--- /dev/null
+++ b/src/System.Private.CoreLib/shared/Internal/Padding.cs
@@ -0,0 +1,26 @@
+// 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 System.Runtime.InteropServices;
+
+namespace Internal
+{
+    /// <summary>A class for common padding constants and eventually routines.</summary>
+    internal static class PaddingHelpers
+    {
+        /// <summary>A size greater than or equal to the size of the most common CPU cache lines.</summary>
+#if ARM64
+        internal const int CACHE_LINE_SIZE = 128;
+#else
+        internal const int CACHE_LINE_SIZE = 64;
+#endif
+    }
+
+    /// <summary>Padding structure used to minimize false sharing</summary>
+    [StructLayout(LayoutKind.Explicit, Size = PaddingHelpers.CACHE_LINE_SIZE - sizeof(int))]
+    internal struct PaddingFor32
+    {
+    }
+}
+