blocks|key|2013980|text|在asio邮件列表中已经提到了这一点，还有一个票证请求这个特性。总之，如果您希望超时和可取消性，则建议使用异步方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2013981|如果无法转换为异步方法，则可以尝试SO_RCVTIMEO和SO_SNDTIMEO套接字选项。它们可以用setsockopt设置，描述符可以用boost：：asio：：ip：：tcp：：socket：：本机方法获得。man+7+socket手册页面上写着|style|CODE|2013982|SO_RCVTIMEO和SO_SNDTIMEO指定接收或发送超时，直到报告错误为止。这个论点是一个结构时间。如果输入或输出函数在这段时间内阻塞，并且数据已经发送或接收，则该函数的返回值将是所传输的数据量；如果没有传输数据并达到超时，则返回-1，将errno设置为EAGAIN或EWOULDBLOCK，就好像套接字被指定为非阻塞一样。如果超时设置为零(默认)，则操作将永远不会超时。超时只对执行套接字I/O+(例如读(2)、recvmsg(2)、发送(2)、sendmsg(2))的系统调用生效；超时对select(2)、轮询(2)、epoll_wait(2)等没有影响。|blockquote|2013983|entityMap|0|LINK|mutability|MUTABLE|url|https://svn.boost.org/trac/boost/ticket/2832|1|http://www.boost.org/doc/libs/1_45_0/doc/html/boost_asio/reference/basic_stream_socket/native.html^0|N|2|0|0|H|B|T|B|1F|A|2Z|C|1Y|W|1|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@$A|Z|B|10|F|G]|$A|11|B|12|F|G]|$A|13|B|14|F|G]|$A|15|B|16|F|G]]|9|@$A|17|B|18|1|19]]|C|$]]|$1|H|3|I|5|J|7|1A|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|1B|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

This has been brought up on the asio mailing lists, there's a <a href="https://svn.boost.org/trac/boost/ticket/2832" rel="noreferrer">ticket</a> requesting the feature as well. To summarize, it is suggested to use asynchronous methods if you desire timeouts and cancellability.

<hr>

If you cannot convert to asynchronous methods, you might try the <code>SO_RCVTIMEO</code> and <code>SO_SNDTIMEO</code> socket options. They can be set with <code>setsockopt</code>, the descriptor can be obtained with the <a href="http://www.boost.org/doc/libs/1_45_0/doc/html/boost_asio/reference/basic_stream_socket/native.html" rel="noreferrer">boost::asio::ip::tcp::socket::native</a> method. The <code>man 7 socket</code> man page says

<blockquote>
 SO_RCVTIMEO and SO_SNDTIMEO
 Specify the receiving or sending timeouts until reporting an
 error. The argument is a struct
 timeval. If an input or output
 function blocks for this period of
 time, and data has been sent
 or received, the return value of that function will be
 the amount of data transferred; if no
 data has been transferred and the
 timeout has been reached then -1 is
 returned with errno set to
 EAGAIN or EWOULDBLOCK just as if the socket was specified to
 be non-blocking. If the timeout is
 set to zero (the default) then the
 operation will never timeout. 
 Timeouts only have effect
 for system calls that perform socket I/O (e.g., read(2),
 recvmsg(2), send(2), sendmsg(2));
 timeouts have no effect for select(2),
 poll(2), epoll_wait(2), etc.
</blockquote>

blocks|key|816687|text|我使用了一些asio文档来生成以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|816688|class+TimeoutAdjust
{
public:
++TimeoutAdjust(unsigned+int+dwTimeout)+:+m_dwTimeout(dwTimeout)+{};

++template<class+Protocol>
++int+level(const+Protocol&+p)+const+{return+SOL_SOCKET;}

++template<class+Protocol>
++int+name(const+Protocol&+p)+const+{return+SO_SNDTIMEO;}

++template<class+Protocol>
++const+void*+data(const+Protocol&+p)+const+{return+&m_dwTimeout;}

++template<class+Protocol>
++size_t+size(const+Protocol&+p)+const+{return+sizeof(m_dwTimeout);}
private:
++unsigned+int+m_dwTimeout;
};|code-block|syntax|javascript|816689|用法：|816690|TimeoutAdjust+adjust(5000);
sSocket.set_option(adjust);|816691|我调试了它，它似乎做了它应该做的事情。|816692|entityMap|0|LINK|mutability|MUTABLE|url|http://think-async.com/Asio/boost_asio_1_3_0/doc/html/boost_asio/reference/SettableSocketOption.html^0|6|6|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

I used some <a href="http://think-async.com/Asio/boost_asio_1_3_0/doc/html/boost_asio/reference/SettableSocketOption.html" rel="noreferrer">asio docs</a> to produce this:

<pre><code>class TimeoutAdjust
{
public:
 TimeoutAdjust(unsigned int dwTimeout) : m_dwTimeout(dwTimeout) {};

 template&lt;class Protocol&gt;
 int level(const Protocol&amp; p) const {return SOL_SOCKET;}

 template&lt;class Protocol&gt;
 int name(const Protocol&amp; p) const {return SO_SNDTIMEO;}

 template&lt;class Protocol&gt;
 const void* data(const Protocol&amp; p) const {return &amp;m_dwTimeout;}

 template&lt;class Protocol&gt;
 size_t size(const Protocol&amp; p) const {return sizeof(m_dwTimeout);}
private:
 unsigned int m_dwTimeout;
};
</code></pre>

Usage:

<pre><code>TimeoutAdjust adjust(5000);
sSocket.set_option(adjust);
</code></pre>

I debugged it, and it appears to do what it is supposed to.

From reading other Stack Overflow entries and the <code>boost::asio</code> documentation, I've confirmed that there is no synchronous ASIO read/write calls that also provide an easy-to-use timeout as a parameter to the call.

I'm in the middle of converting an old-school Linux socket application with select(2) calls that employs timeouts, and I need to do more-or-less the same.

So what is the best way to do this in <code>boost::asio</code>? Looking at the asio documentation, there are many confusing examples of various things to do with timers, but I'm quite confused.

I'd love to see a simple-to-read example of this: Read from a socket, but wait for a maximum of X seconds after which the function either returns with nothing, or returns with whatever it was able to read from the socket before the timeout expired.

C++ Boost ASIO: how to read/write with a timeout?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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通过读取其他堆栈溢出条目和boost::asio文档，我已经确认没有同步的ASIO读/写调用也为调用提供了一个易于使用的超时参数。我正在用select(2)调用转换一个旧的Linux套接字应用程序，这个应用程序需要超时，我需要或多或少地做同样的事情。那么，在boost::asio中最好的方法是什么呢？查看asio文档，...

问C++ Boost ASIO:如何在超时的情况下读写？
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