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

#region Copyright notice and license

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#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
    {
        int counter;

        [DllImport("grpc_csharp_ext.dll")]
        static extern GRPCCallError grpcsharp_test_callback([MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback);

        [DllImport("grpc_csharp_ext.dll")]
        static extern IntPtr grpcsharp_test_nop(IntPtr ptr);

        [TestFixtureSetUp]
        public void Init()
        {
            GrpcEnvironment.Initialize();
        }

        [TestFixtureTearDown]
        public void Cleanup()
        {
            GrpcEnvironment.Shutdown();
        }

        /// <summary>
        /// (~1.26us .NET Windows)
        /// </summary>
        [Test]
        public void CompletionQueueCreateDestroyBenchmark()
        {
            BenchmarkUtil.RunBenchmark(
                100000, 1000000,
                () =>
                {
                    CompletionQueueSafeHandle cq = CompletionQueueSafeHandle.Create();
                    cq.Dispose();
                });
        }

        /// <summary>
        /// Approximate results:
        /// (~80ns Mono Linux)
        /// (~110ns .NET Windows)
        /// </summary>
        [Test]
        public void NativeCallbackBenchmark()
        {
            CompletionCallbackDelegate handler = Handler;

            counter = 0;
            BenchmarkUtil.RunBenchmark(
                1000000, 10000000,
                () =>
                {
                    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,
                () =>
                {
                    grpcsharp_test_callback(new CompletionCallbackDelegate(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,
                () =>
                {
                    grpcsharp_test_nop(IntPtr.Zero);
                });
        }

        private void Handler(GRPCOpError op, IntPtr ptr)
        {
            counter++;
        }
    }
}