分布式实时消息通信的设计与实现

Design and Implementation of Distributed Real Time Message Communication

讨论了在ＵＮＩＸ 原有的消息队列机制基础上设计和实现分布式实时消息通信机制的方法．该机制提供透明的消息通信接口，支持带时间期限约束的实时消息请求．用户在系统调用的参数中可以给定消息请求的时间期限，对于多个远程消息请求，系统能按紧迫程度排队，以保证实时性．系统还可以定时检测消息请求的期限，对能否在期限内完成进行预测并反馈给相应进程．

This paper presents the design and implementation of a distributed real time message communication mechanism based on UNIX message, and the mechanism is able to support the unique interface as UNIX and time constraint message request. Users can assign a time deadline in system calls arguments, and for two or more remote message requests, the system can arrange them to queue up according to degree of emergency. The system would also check the deadline periodically so as to predict whether the deadline requirement can be met and would feed the process back to corresponding user timely.