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//
// ThreadPond.cs
//
// Copyright (C) 2005 Novell, Inc.
//
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Threading;
namespace Beagle.Util {
public class ThreadPond {
private object queue_lock = new object ();
private Queue queue = new Queue ();
private Thread [] threads;
private bool running;
public ThreadPond (int N)
{
queue_lock = new object ();
queue = new Queue ();
ThreadStart worker;
worker = new ThreadStart (Worker);
threads = new Thread [N];
for (int i = 0; i < N; ++i)
threads [i] = new Thread (worker);
running = false;
}
public void Add (ThreadStart start)
{
lock (queue_lock) {
queue.Enqueue (start);
Monitor.Pulse (queue_lock);
}
}
public void Start ()
{
running = true;
Log.Debug ("Starting {0} threads in pond", threads.Length);
for (int i = 0; i < threads.Length; ++i)
threads [i].Start ();
}
public void Stop ()
{
running = false;
// We need to pulse the lock once per thread, so that they
// will all have an opportunity to wake up and terminate.
for (int i = 0; i < threads.Length; ++i)
lock (queue_lock)
Monitor.Pulse (queue_lock);
}
private void Worker ()
{
while (running) {
ThreadStart start = null;
lock (queue_lock) {
if (! running)
return;
if (queue.Count == 0) {
Monitor.Wait (queue_lock);
continue;
}
start = queue.Dequeue () as ThreadStart;
}
if (start == null)
continue;
try {
start ();
} catch (Exception ex) {
Logger.Log.Warn ("Caught exception in ThreadPond worker");
Logger.Log.Warn (ex);
}
}
}
}
}
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