141 lines
4.5 KiB
C#
141 lines
4.5 KiB
C#
#region Copyright notice and license
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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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#endregion
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using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using System.Threading;
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using System.Threading.Tasks;
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using Grpc.Core.Internal;
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namespace Grpc.Core.Internal
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{
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/// <summary>
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/// Pool of threads polling on the same completion queue.
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/// </summary>
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internal class GrpcThreadPool
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{
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readonly GrpcEnvironment environment;
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readonly object myLock = new object();
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readonly List<Thread> threads = new List<Thread>();
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readonly int poolSize;
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CompletionQueueSafeHandle cq;
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public GrpcThreadPool(GrpcEnvironment environment, int poolSize)
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{
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this.environment = environment;
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this.poolSize = poolSize;
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}
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public void Start()
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{
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lock (myLock)
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{
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if (cq != null)
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{
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throw new InvalidOperationException("Already started.");
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}
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cq = CompletionQueueSafeHandle.Create();
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for (int i = 0; i < poolSize; i++)
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{
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threads.Add(CreateAndStartThread(i));
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}
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}
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}
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public void Stop()
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{
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lock (myLock)
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{
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cq.Shutdown();
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Console.WriteLine("Waiting for GRPC threads to finish.");
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foreach (var thread in threads)
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{
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thread.Join();
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}
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cq.Dispose();
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}
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}
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internal CompletionQueueSafeHandle CompletionQueue
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{
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get
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{
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return cq;
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}
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}
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private Thread CreateAndStartThread(int i)
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{
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var thread = new Thread(new ThreadStart(RunHandlerLoop));
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thread.IsBackground = false;
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thread.Start();
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thread.Name = "grpc " + i;
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return thread;
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}
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/// <summary>
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/// Body of the polling thread.
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/// </summary>
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private void RunHandlerLoop()
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{
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CompletionQueueEvent ev;
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do
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{
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ev = cq.Next();
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if (ev.type == GRPCCompletionType.OpComplete)
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{
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bool success = (ev.success != 0);
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IntPtr tag = ev.tag;
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try
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{
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var callback = environment.CompletionRegistry.Extract(tag);
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callback(success);
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}
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catch (Exception e)
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{
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Console.WriteLine("Exception occured while invoking completion delegate: " + e);
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}
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}
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}
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while (ev.type != GRPCCompletionType.Shutdown);
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Console.WriteLine("Completion queue has shutdown successfully, thread " + Thread.CurrentThread.Name + " exiting.");
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}
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}
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}
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