Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/Internal/SafeHandleZeroIsInvalid.cs

-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 #endregion
-    
+
 using System;
-using System.Reflection;
-using Google.Protobuf.TestProtos;
-using NUnit.Framework;
+using System.Runtime.InteropServices;
 
-namespace Google.Protobuf
+namespace Grpc.Core.Internal
 {
-    public class DeprecatedMemberTest
+    /// <summary>
+    /// Safe handle to wrap native objects.
+    /// </summary>
+    internal abstract class SafeHandleZeroIsInvalid : SafeHandle
     {
-        private static void AssertIsDeprecated(MemberInfo member)
+        public SafeHandleZeroIsInvalid() : base(IntPtr.Zero, true)
         {
-            Assert.NotNull(member);
-            Assert.IsTrue(member.IsDefined(typeof(ObsoleteAttribute), false), "Member not obsolete: " + member);
         }
 
-        [Test]
-        public void TestDepreatedPrimitiveValue()
+        public SafeHandleZeroIsInvalid(bool ownsHandle) : base(IntPtr.Zero, ownsHandle)
         {
-            AssertIsDeprecated(typeof(TestDeprecatedFields).GetProperty("DeprecatedInt32"));
         }
 
+        public override bool IsInvalid
+        {
+            get
+            {
+                return handle == IntPtr.Zero;
+            }
+        }
+
+        protected override bool ReleaseHandle()
+        {
+            // handle is not owned.
+            return true;
+        }
     }
 }