class WorkQueue
{
    ConcurrentQueue<WorkItem> q = new ConcurrentQueue<WorkItem>();

    AutoResetEvent semaphore = new AutoResetEvent(false);

    public void DoWork()
    {
        for (; ; )
        {
            semaphore.WaitOne(60 * 1000);
            WorkItem workItem;
            while (q.TryDequeue(out workItem))
            {
                workItem.DoAsyncWork();
            }
        }
    }

    public void AddWork(WorkItem workItem)
    {
        q.Enqueue(workItem);
        semaphore.Set();
    }
}

public abstract class WorkItem
{
    public abstract void DoAsyncWork();
}