Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core.Tests/PInvokeTest.cs

Index: third_party/grpc/src/csharp/Grpc.Core.Tests/PInvokeTest.cs
diff --git a/third_party/grpc/src/csharp/Grpc.Core.Tests/PInvokeTest.cs b/third_party/grpc/src/csharp/Grpc.Core.Tests/PInvokeTest.cs
new file mode 100644
index 0000000000000000000000000000000000000000..da0ea2e6dc954153586ba840cb40be86fc6e5cc4
--- /dev/null
+++ b/third_party/grpc/src/csharp/Grpc.Core.Tests/PInvokeTest.cs
@@ -0,0 +1,130 @@
+#region Copyright notice and license
+
+// Copyright 2015-2016, 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.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Threading;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+
+namespace Grpc.Core.Tests
+{
+    public class PInvokeTest
+    {
+        static readonly NativeMethods Native = NativeMethods.Get();
+
+        int counter;
+
+        /// <summary>
+        /// (~1.26us .NET Windows)
+        /// </summary>
+        [Test]
+        public void CompletionQueueCreateDestroyBenchmark()
+        {
+            GrpcEnvironment.AddRef();  // completion queue requires gRPC environment being initialized.
+
+            BenchmarkUtil.RunBenchmark(
+                10, 10,
+                () =>
+                {
+                    CompletionQueueSafeHandle cq = CompletionQueueSafeHandle.Create();
+                    cq.Dispose();
+                });
+
+            GrpcEnvironment.Release();
+        }
+
+        /// <summary>
+        /// Approximate results:
+        /// (~80ns Mono Linux)
+        /// (~110ns .NET Windows)
+        /// </summary>
+        [Test]
+        public void NativeCallbackBenchmark()
+        {
+            OpCompletionDelegate handler = Handler;
+
+            counter = 0;
+            BenchmarkUtil.RunBenchmark(
+                1000000, 10000000,
+                () =>
+                {
+                    Native.grpcsharp_test_callback(handler);
+                });
+            Assert.AreNotEqual(0, counter);
+        }
+
+        /// <summary>
+        /// Creating a new native-to-managed callback has significant overhead
+        /// compared to using an existing one. We need to be aware of this.
+        /// (~50us on Mono Linux!!!)
+        /// (~1.1us on .NET Windows)
+        /// </summary>
+        [Test]
+        public void NewNativeCallbackBenchmark()
+        {
+            counter = 0;
+            BenchmarkUtil.RunBenchmark(
+                10000, 10000,
+                () =>
+                {
+                    Native.grpcsharp_test_callback(new OpCompletionDelegate(Handler));
+                });
+            Assert.AreNotEqual(0, counter);
+        }
+
+        /// <summary>
+        /// Tests overhead of a simple PInvoke call.
+        /// (~46ns .NET Windows)
+        /// </summary>
+        [Test]
+        public void NopPInvokeBenchmark()
+        {
+            BenchmarkUtil.RunBenchmark(
+                1000000, 100000000,
+                () =>
+                {
+                    Native.grpcsharp_test_nop(IntPtr.Zero);
+                });
+        }
+
+        private void Handler(bool success)
+        {
+            counter++;
+        }
+    }
+}