[英]Is it possible to refactor this EventWaitHandle to not use Thread.Sleep() to control the race condition?
我想从服务器向所有客户端发送消息。 有0- *个客户端。 加载客户端时,服务器可能正在运行或可能未运行。 这里的功能按我的需要工作。 我试图弄清楚是否可以在没有Thread.Sleep()
情况下完成此工作? 还要注意,客户端和服务器分别处于独立的进程中。
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();
}
}
}
我想这取决于您是否确定所有客户都将在一秒钟内获得他们的时间。 这听起来很合理,但是在极大的压力下,有些客户可能会错过它。 这有多重要?
无论如何,我认为这正是您应该使用ZeroMQ进行的事情。 它重量轻,可以为您解决所有潜在的错误。
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