1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
#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.Logging;
namespace Grpc.Core.Internal
{
/// <summary>
/// Pool of threads polling on the same completion queue.
/// </summary>
internal class GrpcThreadPool
{
static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<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();
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)
{
Logger.Error(e, "Exception occured while invoking completion delegate");
}
}
}
while (ev.type != GRPCCompletionType.Shutdown);
}
}
}
|
