2 // System.Runtime.Remoting.Channels.RemotingThreadPool.cs
4 // Author: Lluis Sanchez Gual (lluis@ximian.com)
6 // 2005 (C) Copyright, Novell, Inc.
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System.Collections;
32 using System.Threading;
34 namespace System.Runtime.Remoting.Channels
36 internal class RemotingThreadPool
38 const int ThreadLimit = 1000;
39 const int ThreadWaitTime = 20000; //ms
40 const int PoolGrowDelay = 500; // ms
41 const int MinThreads = 3;
45 Queue workItems = new Queue ();
46 AutoResetEvent threadDone = new AutoResetEvent (false);
47 ArrayList runningThreads = new ArrayList ();
50 static object globalLock = new object ();
51 static RemotingThreadPool sharedPool;
53 public static RemotingThreadPool GetSharedPool ()
56 if (sharedPool == null)
57 sharedPool = new RemotingThreadPool ();
58 sharedPool.poolUsers++;
73 foreach (Thread t in runningThreads)
75 runningThreads.Clear ();
77 if (this == sharedPool)
82 public bool RunThread (ThreadStart threadStart)
86 throw new RemotingException ("Server channel stopped.");
88 if (freeThreads > 0) {
90 workItems.Enqueue (threadStart);
91 Monitor.Pulse (workItems);
93 } else if (runningThreads.Count < MinThreads) {
94 workItems.Enqueue (threadStart);
100 // Try again some ms later, and if there are still no free threads,
101 // then create a new one
103 threadDone.WaitOne (PoolGrowDelay, false);
107 throw new RemotingException ("Server channel stopped.");
109 if (freeThreads > 0) {
111 workItems.Enqueue (threadStart);
112 Monitor.Pulse (workItems);
114 if (runningThreads.Count >= ThreadLimit)
116 workItems.Enqueue (threadStart);
123 void StartPoolThread ()
125 Thread thread = new Thread (new ThreadStart (PoolThread));
126 runningThreads.Add (thread);
127 thread.IsBackground = true;
134 ThreadStart work = null;
137 if (workItems.Count > 0)
138 work = (ThreadStart) workItems.Dequeue ();
142 if (!Monitor.Wait (workItems, ThreadWaitTime)) {
143 // Maybe it timed out when the work was being queued.
144 if (workItems.Count > 0) {
145 work = (ThreadStart) workItems.Dequeue ();
148 if (freeThreads == 0) threadDone.Reset ();
149 runningThreads.Remove (Thread.CurrentThread);
155 } while (work == null);
159 // Can't do anything with the exception