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#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.");
}
}
}
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