带超时的多线程面向对象套接字代码
我们有一个很好的类，它建立一个套接字连接，然后重复连接它。 如果超时，我们想抛出异常。
我想要的是每个对象都有一个独立的超时。但是，正如其他帖子中所述，没有可移植的套接字超时代码。
我目前正在使用信号来实现，但这很丑陋，因为有一个全局变量指向当前对象。这意味着该代码不能是多线程的。
有没有办法以每个线程的方式建立一个计时器，以便每个对象都可以在自己的线程中运行？这似乎是最干净的方式。我可以构建一个队列，以便它们都在关键部分等待，但这非常难看，并且会影响多线程性能（而且我无论如何也不想这样做）。
We have a nice class that establishes a socket connection and then hits it repeatedly.
If it ever gets a timeout, we want to throw an exception.
What I'd like is an independent timeout for each object. However, as noted in other posts there is no portable socket timeout code.
I am currently doing it with a signal, but this is ugly, because there's a single global variable that points to the current object. This means this code could not be multithreaded.
Is there any way of establishing a timer in a per-thread way so that each object could run within its own thread? That seems the cleanest way. I could build a queue so that they all wait in a critical section, but that's extremely ugly and would impact multithreading performance (and I don't want to anyway).
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您可以通过使用异步 I/O 来做到这一点。例如，使用
libevent或asio。只需在同一调度线程（I/O 服务）上启动读取操作和计时器即可。You can do that by using async I/O. For example, using
libeventorasio. Just fire up a read operation and a timer on the same dispatching thread (I/O service).