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				|  |  | +#region Copyright notice and license
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				|  |  | +
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				|  |  | +// Copyright 2015, Google Inc.
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				|  |  | +// All rights reserved.
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				|  |  | +//
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				|  |  | +// Redistribution and use in source and binary forms, with or without
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				|  |  | +// modification, are permitted provided that the following conditions are
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				|  |  | +// met:
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				|  |  | +//
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				|  |  | +//     * Redistributions of source code must retain the above copyright
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				|  |  | +// notice, this list of conditions and the following disclaimer.
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				|  |  | +//     * Redistributions in binary form must reproduce the above
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				|  |  | +// copyright notice, this list of conditions and the following disclaimer
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				|  |  | +// in the documentation and/or other materials provided with the
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				|  |  | +// distribution.
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				|  |  | +//     * Neither the name of Google Inc. nor the names of its
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				|  |  | +// contributors may be used to endorse or promote products derived from
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				|  |  | +// this software without specific prior written permission.
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				|  |  | +//
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				|  |  | +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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				|  |  | +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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				|  |  | +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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				|  |  | +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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				|  |  | +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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				|  |  | +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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				|  |  | +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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				|  |  | +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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				|  |  | +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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				|  |  | +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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				|  |  | +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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				|  |  | +
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				|  |  | +#endregion
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				|  |  | +
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				|  |  | +using System;
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				|  |  | +using System.Diagnostics;
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				|  |  | +using System.Threading;
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				|  |  | +using System.Threading.Tasks;
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				|  |  | +using Grpc.Core;
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				|  |  | +using Grpc.Core.Internal;
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				|  |  | +using Grpc.Core.Utils;
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				|  |  | +using NUnit.Framework;
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				|  |  | +using System.Runtime.InteropServices;
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				|  |  | +
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				|  |  | +namespace Grpc.Core.Tests
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				|  |  | +{
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				|  |  | +    public class PInvokeTest
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				|  |  | +    {
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				|  |  | +        int counter;
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				|  |  | +
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				|  |  | +        [DllImport("grpc_csharp_ext.dll")]
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				|  |  | +        static extern GRPCCallError grpcsharp_test_callback([MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback);
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				|  |  | +
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				|  |  | +        [DllImport("grpc_csharp_ext.dll")]
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				|  |  | +        static extern IntPtr grpcsharp_test_nop(IntPtr ptr);
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				|  |  | +
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				|  |  | +        [TestFixtureSetUp]
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				|  |  | +        public void Init()
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				|  |  | +        {
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				|  |  | +            GrpcEnvironment.Initialize();
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        [TestFixtureTearDown]
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				|  |  | +        public void Cleanup()
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				|  |  | +        {
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				|  |  | +            GrpcEnvironment.Shutdown();
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        [Test]
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				|  |  | +        public void CompletionQueueCreateDestroyBenchmark()
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				|  |  | +        {
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				|  |  | +            BenchmarkUtil.RunBenchmark(
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				|  |  | +                100000, 1000000,
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				|  |  | +                () => {
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				|  |  | +                    CompletionQueueSafeHandle cq = CompletionQueueSafeHandle.Create();
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				|  |  | +                    cq.Dispose();
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				|  |  | +                }
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				|  |  | +            );
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				|  |  | +        }
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				|  |  | +
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				|  |  | +
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				|  |  | +        /// <summary>
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				|  |  | +        /// Approximate results:
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				|  |  | +        /// (mono ~80ns)
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				|  |  | +        /// </summary>
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				|  |  | +        [Test]
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				|  |  | +        public void NativeCallbackBenchmark()
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				|  |  | +        {
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				|  |  | +            CompletionCallbackDelegate handler = Handler;
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				|  |  | +
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				|  |  | +            counter = 0;
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				|  |  | +            BenchmarkUtil.RunBenchmark(
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				|  |  | +                1000000, 10000000,
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				|  |  | +                () => {
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				|  |  | +                    grpcsharp_test_callback(handler);
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				|  |  | +                }
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				|  |  | +            );
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				|  |  | +            Assert.AreNotEqual(0, counter);
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        /// <summary>
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				|  |  | +        /// Creating a new native-to-managed callback has significant overhead
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				|  |  | +        /// compared to using an existing one. We need to be aware of this.
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				|  |  | +        /// (~50us on mono)
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				|  |  | +        /// </summary>
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				|  |  | +        [Test]
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				|  |  | +        public void NewNativeCallbackBenchmark()
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				|  |  | +        {
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				|  |  | +            counter = 0;
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				|  |  | +            BenchmarkUtil.RunBenchmark(
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				|  |  | +                10000, 10000,
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				|  |  | +                () => {
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				|  |  | +                grpcsharp_test_callback(new CompletionCallbackDelegate(Handler));
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				|  |  | +            }
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				|  |  | +            );
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				|  |  | +            Assert.AreNotEqual(0, counter);
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        /// <summary>
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				|  |  | +        /// Tests overhead of a simple PInvoke call.
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				|  |  | +        /// </summary>
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				|  |  | +        [Test]
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				|  |  | +        public void NopPInvokeBenchmark()
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				|  |  | +        {
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				|  |  | +            CompletionCallbackDelegate handler = Handler;
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				|  |  | +
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				|  |  | +            BenchmarkUtil.RunBenchmark(
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				|  |  | +                1000000, 100000000,
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				|  |  | +                () => {
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				|  |  | +                    grpcsharp_test_nop(IntPtr.Zero);
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				|  |  | +                }
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				|  |  | +            );
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				|  |  | +        }
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				|  |  | +
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				|  |  | +        private void Handler(GRPCOpError op, IntPtr ptr) {
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				|  |  | +            counter ++;
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				|  |  | +        }
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				|  |  | +    }
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				|  |  | +}
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				|  |  | +
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