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WaitHandle.WaitAny Method (WaitHandle[], Int32) 的文档说它返回“满足等待的对象的数组索引，如果没有对象满足等待，则返回 WaitTimeout，并且时间间隔相当于毫秒超时已经过去”，并且在程序集浏览器我看到 WaitHandle.WaitTimeout 是 258。

那么为什么我有时会从这个函数中得到 0x7fffffff (Int32.MaxValue) 作为返回值呢？

这是 WaitAny() 中的已知错误，还是文档中缺少一行？

稍后添加：

顺便说一句，错误发生了几次，然后就消失了，我没有做任何事情来“修复”手柄或类似的东西。

微软文档

Xamarin 文档

代码：

class CommandQueue
{
    EventWaitHandle m_abortRequest = new EventWaitHandle (false, EventResetMode.AutoReset);
    Semaphore m_commandCount = new Semaphore (0, 10000);

    public CommandQueue ()
    {
        m_processTask = new Task(() => Process ());
        m_processTask.Start ();
    }

    public async Task Process()
    {
        WaitHandle [] handles = new WaitHandle [2];
        handles [0] = m_abortRequest;
        handles [1] = m_commandCount;

        for (;;)
        {
            int wait = WaitHandle.WaitAny (handles, 500);
            if (wait == WaitHandle.WaitTimeout)
            {
                OnIdleTimer ();
            }
            else if (wait == 0)
            {
                // SNIP: Code to handle a request to abort the processing of commands  
                break;
            }
            else if (wait == 1)
            {
                // SNIP: Code to process the next command in the queue
                await Process(nextCommand);
            }
            else
            {
                Debug.WriteLine ("*** Unexpected WaitAny(" + wait + " = 0x" + wait.ToString("X6") + ")!");
            }
        }
    }
}
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0 回答 0