Question

我想从服务器向所有客户端发送消息。有0- *客户端。加载客户端时，服务器可能正在运行，也可能没有运行。这里的功能是我想要的。我想知道是否可以在没有Thread.Sleep()的情况下完成此操作？另请注意，客户端和服务器都是独立的进程。

服务器部分

class NamedEventsServer
{
    internal static void Main()
    {
        const string ewhName = "StickyNoteEwh";

        EventWaitHandle ewh = null;
        bool doesNotExist = false;
        bool wasCreated;

        // Attempt to open the named event.
        try
        {
            ewh = EventWaitHandle.OpenExisting(ewhName);
        }
        catch (WaitHandleCannotBeOpenedException)
        {
            Console.WriteLine("Named event does not exist.");
            doesNotExist = true;
        }
        if (doesNotExist)
        {
            // The event does not exist, so create it.

            ewh = new EventWaitHandle(true,
                EventResetMode.ManualReset,
                ewhName,
                out wasCreated);

            if (wasCreated)
            {
                Console.WriteLine("Created the named event.");
            }
            else
            {
                Console.WriteLine("Unable to create the event.");
                return;
            }
        }
        ewh.Set();
        Thread.Sleep(1000);//wait one second...giving threads enough time to all respond.  Then stop triggering the event.
        ewh.Reset();

        //exit
    }
}

客户端部分

class NamedEventsClient
{
    internal static void Main()
    {
        const string ewhName = "StickyNoteEwh";

        while (true)
        {
            EventWaitHandle ewh = null;
            bool doesNotExist = false;
            bool wasCreated;
            // Attempt to open the named event.
            try
            {
                ewh = EventWaitHandle.OpenExisting(ewhName);
            }
            catch (WaitHandleCannotBeOpenedException)
            {
                Console.WriteLine("Named event does not exist.");
                doesNotExist = true;
            }
            if (doesNotExist)
            {
                // The event does not exist, so create it.

                ewh = new EventWaitHandle(false,
                    EventResetMode.ManualReset,
                    ewhName,
                    out wasCreated);

                if (wasCreated)
                {
                    Console.WriteLine("Created the named event.");
                }
                else
                {
                    Console.WriteLine("Unable to create the event.");
                    return;
                }
            }
            Console.WriteLine("Wait on the event.");
            ewh.WaitOne();
            Console.WriteLine("Event was signaled.");
            //Console.WriteLine("Press the Enter key exit.");
            Thread.Sleep(1000);
            //Console.ReadLine();
        }
    }
}

Answer 1

我想这取决于你是否确定所有客户都会在第二时间内获得他们的时间片。这听起来很合理，但在极端压力下，一些客户可能会错过它。这有多重要？

无论如何，我认为这正是你应该使用ZeroMQ的那种东西。它重量轻，可以为您解决所有潜在的错误。

是否有可能重构此EventWaitHandle以不使用Thread.Sleep（）来控制竞争条件？

1 个答案: