internal static void JobFinished(WebRequestThread aThread)
{
lock (iLock)
{
iWorkPool.Remove(aThread);
iFreePool.Push(aThread);
if (iFreePool.Count == 1)
{
iHasFreeThreads.Set();
}
Trace.WriteLine(Trace.kCore, "WebRequestPool.JobFinished: iFreePool.Count=" + iFreePool.Count + ", iWorkPool.Count=" + iWorkPool.Count);
}
}
public static void QueueJob(IJob aJob)
{
if (!aJob.HasWork())
return;
WebRequestThread t = null;
while (t == null)
{
List<WebRequestThread> threadsToDelete = new List<WebRequestThread>();
// get a free thread from the pool
lock (iLock)
{
// remove any excess threads from the free pool
while (iFreePool.Count > kMinNumThreads)
{
threadsToDelete.Add(iFreePool.Pop());
}
// get a free thread, if available
if (iFreePool.Count > 0)
{
t = iFreePool.Pop();
Trace.WriteLine(Trace.kCore, "WebRequestPool.QueueJob: popped iFreePool new count = " + iFreePool.Count);
if (iFreePool.Count == 0)
{
iHasFreeThreads.Reset();
}
}
}
// cleanup excess threads
foreach (WebRequestThread toDelete in threadsToDelete)
{
toDelete.Dispose();
Trace.WriteLine(Trace.kCore, "WebRequestPool.QueueJob: deleted WebRequestThread");
}
// if no threads are free, create a new one if allowed
if (t == null && kCanCreateThreads)
{
try
{
t = new WebRequestThread();
Trace.WriteLine(Trace.kCore, "WebRequestPool.QueueJob: created WebRequestThread");
}
catch (OutOfMemoryException)
{
Trace.WriteLine(Trace.kCore, "WebRequestPool.QueueJob: failed to create WebRequestThread");
}
}
// wait for a free thread if there are none available and could not create one
if (t == null)
{
Trace.WriteLine(Trace.kCore, "WebRequestPool.QueueJob: no threads available, waiting...");
iHasFreeThreads.WaitOne();
}
}
// add the thread to the work pool
lock (iLock)
{
iWorkPool.Add(t);
Trace.WriteLine(Trace.kCore, "WebRequestPool.QueueJob: iFreePool.Count=" + iFreePool.Count + ", iWorkPool.Count=" + iWorkPool.Count);
}
t.Start(aJob);
}