关键词: 完成端口, 单件设计模式, 串口并发通信, VC++

Abstract: This paper provides an efficient solution to multiple serial concurrent communications，based on the I/O Completion Port（IOCP） mechanism in the VC++ development platform，to meet the communication needs in the modern industrial automation control systems.In addition to presenting the basic principles and the implementation process of this solution，this paper also provides the keys to some common runtime problems.In this solution，singleton design pattern is taken to ensure that there is only one completion port in each application，and problem of user inconvenience is solved with a higher level of package.The experimental results show that，in case of concurrent communication with a large number of serial ports，the solution is more efficient and with less consumption of system resource than the ones based on overlapped I/O which is now widely used.

Key words: I/O completion port, singleton design pattern, concurrent serial port communication, VC++