提高ASIO超时 [英] boost asio timeout

问题描述

可能重复：结果
  <一href=\"http://stackoverflow.com/questions/291871/how-to-set-a-timeout-on-blocking-sockets-in-boost-asio\">How就在升压asio的阻止套接字设置超时？

我看了一些条目约超时之前，但我不明白。

I read some of the entries before about the timeout but I don't understand.

我要为连接一个规定的时间。
在连接code如下：

I want a defined timeout for the connection. the connect code looks like:

try{
  boost::asio::ip::tcp::resolver              resolver(m_ioService);
  boost::asio::ip::tcp::resolver::query       query(link.get_host(), link.get_scheme());
  boost::asio::ip::tcp::resolver::iterator    endpoint_iterator = resolver.resolve(query);
  boost::asio::ip::tcp::resolver::iterator    end;
  boost::system::error_code                   error   =   boost::asio::error::host_not_found;

  while (error && endpoint_iterator != end)
   {
    m_socket.close();
    m_socket.connect(*endpoint_iterator++, error);
   }
}

我也想读超时。

我用的boost :: ASIO :: read_until（m_socket，响应为\\ r \\ n）; 为读取头

是有可能组简单的超时？

is it possible to set SIMPLE a timeout?

推荐答案

所有我认为你应该总是使用异步方法，因为他们是更好的，你的设计将只能从反应堆模式方法中获益的拳头。
在你在赶时间，你是一种原型的不好的情况下，同步方法是有用的。在这种情况下，我同意你的看法，没有任何超时支持，他们不能在现实世界中使用。

Fist of all I believe that you should ALWAYS use the async methods since they are better and your design will only benefit from a reactor pattern approach. In the bad case that you're in a hurry and you're kind of prototyping, the sync methods can be useful. In this case I do agree with you that without any timeout support, they cannot be used in the real world.

我所做的是很简单的：

void HttpClientImpl::configureSocketTimeouts(boost::asio::ip::tcp::socket& socket)
{
#if defined OS_WINDOWS
    int32_t timeout = 15000;
    setsockopt(socket.native(), SOL_SOCKET, SO_RCVTIMEO, (const char*)&timeout, sizeof(timeout));
    setsockopt(socket.native(), SOL_SOCKET, SO_SNDTIMEO, (const char*)&timeout, sizeof(timeout));
#else
    struct timeval tv;
    tv.tv_sec  = 15; 
    tv.tv_usec = 0;         
    setsockopt(socket.native(), SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
    setsockopt(socket.native(), SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
#endif
}

上面的code工作都在Windows和Linux上和Mac OS上，根据OS_WINDOWS宏。

The code above works both on windows and on Linux and on MAC OS, according to the OS_WINDOWS macro.

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