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