Woopsa.CustomThreadPool.GetNextIdleThread C# (CSharp) Method

        private CustomThreadPoolThread GetNextIdleThread(TimeSpan timeout)
        {
            if (_semaphore.WaitOne(timeout))
            {
                lock (_threads)
                {
                    if (_aborting)
                        return null;
                    CustomThreadPoolThread thread = null;
                    foreach (var item in _threads)
                        if (item.IsIdle)
                        {
                            thread = item;
                            break;
                        }
                    if (thread == null)
                    {
                        Debug.Assert(_threads.Count <= _threadPoolSize);
                        _lastThreadIndex++;
                        thread = new CustomThreadPoolThread(Name + _lastThreadIndex.ToString(), Priority);
                        thread.Idle += OnIdle;
                        _threads.Add(thread);
                    }
                    return thread;
                }
            }
            else
                return null;
        }