public IAsyncResult BeginGetContext(AsyncCallback callback, Object state)
{
CheckDisposed();
if (!listening)
{
throw new InvalidOperationException("Please, call Start before using this method.");
}
ListenerAsyncResult ares = new ListenerAsyncResult(callback, state);
// lock wait_queue early to avoid race conditions
lock (wait_queue) {
lock (ctx_queue) {
HttpListenerContext ctx = GetContextFromQueue();
if (ctx != null)
{
ares.Complete(ctx, true);
return(ares);
}
}
wait_queue.Add(ares);
}
return(ares);
}
internal void RegisterContext(HttpListenerContext context)
{
try {
Monitor.Enter(registry);
registry [context] = context;
Monitor.Enter(wait_queue);
Monitor.Enter(ctx_queue);
if (wait_queue.Count == 0)
{
ctx_queue.Add(context);
}
else
{
ListenerAsyncResult ares = (ListenerAsyncResult)wait_queue [0];
wait_queue.RemoveAt(0);
ares.Complete(context);
}
} finally {
Monitor.Exit(ctx_queue);
Monitor.Exit(wait_queue);
Monitor.Exit(registry);
}
}