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Im building a TCP client based on Boost::ASIO lib. I used read_some() from Boost to read the response from the server. I want to implement a time out logic in it, which send a "ping" command if there has been no communication for 10 seconds. The problem is 

l=_socket->read_some(boost::asio::buffer(this->reply,sizeof(this->reply)),error);

seems to block the program execution when there is no data to be transferred to the read buffer. So is there any way out of it? I didn't want to use the async_read_some() as I need this thread to sleep if there is no data has been transferred in to the buffer, that was easily done in read_some() as it returns the size of data transferred. The main thing is even during time-out I dont want to close the connection, but to check if the server responds to a ping command, if it doesn't I would move to re-connection. So this is more or less checking if the server is still there connected, when no data is transmitted over a time period.

Sam Miller
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Jishnu U Nair
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  • If you could clarify why you are averse to using `async_read_some()` this might not be closed as a duplicate. – Sam Miller Mar 12 '13 at 19:39
  • A synchronous blocking read with timeout can be implemented via an asynchronous read, as shown [here](http://stackoverflow.com/questions/10858719). For non-blocking without a timeout, Boost.Asio sockets can be made synchronous non-blocking via [`socket::non_blocking()`](http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio/reference/basic_stream_socket/non_blocking/overload2.html). – Tanner Sansbury Mar 12 '13 at 19:54
  • @SamMiller I dont want to use async_read_some() because my read thread check if the length of the message is greater than zero, if so data handler is called else the thread sleeps, I couldn't implement this with async_read_some(). If there is any way to do that I will be happy to change by the way. – Jishnu U Nair Mar 12 '13 at 20:19
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    @Jishnu U Nair threads and sleepings sound like an incorrect approach. Did you take a look at asio examples? – Igor R. Mar 13 '13 at 11:50

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