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I'm currently using a thread to handle Connect and Send calls asynchronously. This is all working fine, but now I want to make receiving asynchronous too. How should I receive data without pausing the whole queue while waiting for data? The only solution I can think of right now is a second thread.
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In an asynchronous socket, you CAN do other stuff while waiting for the client to send data to you, so now you CAN have multiple clients connecting to you. Synchronous uses a function like receive() which blocks until it gets a message. Asynchronous has beginReceive() endReceive() or similar functions.
The send, receive, and reply operations may be synchronous or asynchronous. A synchronous operation blocks a process till the operation completes. An asynchronous operation is non-blocking and only initiates the operation.
The default mode of socket calls is blocking. A blocking call does not return to your program until the event you requested has been completed.
Socket programming is a way of connecting two nodes on a network to communicate with each other. One socket(node) listens on a particular port at an IP, while the other socket reaches out to the other to form a connection. The server forms the listener socket while the client reaches out to the server.
Look into non-blocking sockets and polling APIs like select(2)/poll(2)/epoll(4)/kqueue(2).
Specifically in C++, look into boost::asio.
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Depending on what you're doing, non-blocking I/O with select may be the answer.
Take a look at this tutorial.
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