Question

I writing TCP client which should be able to send and receive data at the same time.
Could you tell me how should I call async_send and async_receive is separate threads?

In the other words how to call

m_Socket.async_send(boost::asio::buffer(txBuf.c_str(), txBuf.length()+1),
    boost::bind(&TCPClient::sendingHandler, this, boost::asio::placeholders::error));

m_Socket.async_receive(boost::asio::buffer(rxBuf, maxBufLen),
    boost::bind(&TCPClient::sendingHandler, this, boost::asio::placeholders::error));

in

boost::thread receivingThread(boost::bind(...));
boost::thread sendingThread(boost::bind(...));

And will it work correctly if I call async_send or async_receive again inside handlers? I need an infinitive loop for sending/receivind data.

Answer 1

Main idea is – send and receive in recursion insideTCPClient::sendingHandler/receivingHandler on the 2 io_service's. This io_service's are called inside 2 threads –

boost::thread receivingThread(boost::bind(...));
boost::thread sendingThread(boost::bind(...));

This idea is clearly seen in this tutorial. The only difference that you have to call and use 2 separate io_service's.

Another option is 1 io_service and multiply threads calling io_service::run. But then you have to use boost::asio::strand far thread safety:

boost::asio::strand* _strand = new boost::asio::strand(io);
//then use it in handlers
boost::asio::async_read(*socket, 
                    boost::asio::buffer(msg.data(), result.size),
                    (*_strand).wrap(
                    boost::bind(&ConnectionInterface::parsePacket, shared_from_this(), boost::asio::placeholders::error)));