c# - 生产者消费者在队列为空时等待？

Question

我有一个需要按顺序处理的工作项列表。有时列表会是空的，有时会有一千个项目。一次只能按顺序处理一个。目前我正在做以下对我来说看起来很愚蠢的事情，因为我在消费者任务中使用 Thread.Sleep 等待 100 毫秒，然后再检查列表是否为空。这是标准的做法还是我完全错了。

public class WorkItem
{

}

public class WorkerClass
{
    CancellationTokenSource cts = new CancellationTokenSource();
    CancellationToken ct = new CancellationToken();

    List<WorkItem> listOfWorkItems = new List<WorkItem>();

    public void start()
    {
        Task producerTask = new Task(() => producerMethod(ct), ct);
        Task consumerTask = new Task(() => consumerMethod(ct), ct);

        producerTask.Start();
        consumerTask.Start();
    }

    public void producerMethod(CancellationToken _ct)
    {

        while (!_ct.IsCancellationRequested)
        {
            //Sleep random amount of time
            Random r = new Random();
            Thread.Sleep(r.Next(100, 1000));

            WorkItem w = new WorkItem();
            listOfWorkItems.Add(w);
        }
    }

    public void consumerMethod(CancellationToken _ct)
    {

        while (!_ct.IsCancellationRequested)
        {
            if (listOfWorkItems.Count == 0)
            {
                //Sleep small small amount of time to avoid continuously polling this if statement
                Thread.Sleep(100);
                continue;
            }

            //Process first item
            doWorkOnWorkItem(listOfWorkItems[0]);

            //Remove from list
            listOfWorkItems.RemoveAt(0);
        }
    }

    public void doWorkOnWorkItem(WorkItem w)
    {
        // Do work here - synchronous to execute in order (10ms to 5min execution time)
    }

}

非常感谢您的建议。

谢谢

Answer 1

使用BlockingCollection .它不忙等待。

参见 https://stackoverflow.com/a/5108487/56778举个简单的例子。或者 http://www.informit.com/guides/content.aspx?g=dotnet&seqNum=821了解更多详情。