synchronous, asynchronous, blocking, and non-blocking

This is a recent need to implement a TCP-based protocol that is more complex to communicate with devices before the problem is not too clear

And then I saw this, and suddenly enlightened.

This is a TCP-related explanation for QT:

http://www.bogotobogo.com/Qt/Qt5_Asynchronous_QTcpServer_QThreadPool.php

http://blog.csdn.net/chenlong12580/article/details/7431864

http://blog.csdn.net/chenlong12580/article/details/9003139

QT serial communication, of course, there are blocking and non-blocking, call Waitforxx function will suspend the current caller thread, then blocked.

http://blog.csdn.net/chenlong12580/article/details/8976176

http://blog.csdn.net/chenlong12580/article/details/9003139

Note: If the main function does not enter the primary event loop of QT, then the CONNECT function will have no effect.

synchronous, asynchronous, blocking, and non-blocking