Example for threading queue book "Accelerated C# 2008" (CrudeThreadPool class) not work correctly. If I insert long job in WorkFunction() on 2-processor machine executing for next task don't run before first is over. How to solve this problem? I want to load the processor to 100 percent
public class CrudeThreadPool
{
static readonly int MAX_WORK_THREADS = 4;
static readonly int WAIT_TIMEOUT = 2000;
public delegate void WorkDelegate();
public CrudeThreadPool()
{
stop = 0;
workLock = new Object();
workQueue = new Queue();
threads = new Thread[MAX_WORK_THREADS];
for (int i = 0; i < MAX_WORK_THREADS; ++i)
{
threads[i] = new Thread(new ThreadStart(this.ThreadFunc));
threads[i].Start();
}
}
private void ThreadFunc()
{
lock (workLock)
{
int shouldStop = 0;
do
{
shouldStop = Interlocked.Exchange(ref stop, stop);
if (shouldStop == 0)
{
WorkDelegate workItem = null;
if (Monitor.Wait(workLock, WAIT_TIMEOUT))
{
// Process the item on the front of the queue
lock (workQueue)
{
workItem = (WorkDelegate)workQueue.Dequeue();
}
workItem();
}
}
} while (shouldStop == 0);
}
}
public void SubmitWorkItem(WorkDelegate item)
{
lock (workLock)
{
lock (workQueue)
{
workQueue.Enqueue(item);
}
Monitor.Pulse(workLock);
}
}
public void Shutdown()
{
Interlocked.Exchange(ref stop, 1);
}
private Queue workQueue;
private Object workLock;
private Thread[] threads;
private int stop;
}
public class EntryPoint
{
static void WorkFunction()
{
Console.WriteLine("WorkFunction() called on Thread 0}", Thread.CurrentThread.GetHashCode());
//some long job
double s = 0;
for (int i = 0; i < 100000000; i++)
s += Math.Sin(i);
}
static void Main()
{
CrudeThreadPool pool = new CrudeThreadPool();
for (int i = 0; i < 10; ++i)
{
pool.SubmitWorkItem(
new CrudeThreadPool.WorkDelegate(EntryPoint.WorkFunction));
}
pool.Shutdown();
}
}