Message communication facilities for distributed real-time systems based on concurrent object-oriented paradigm

Abstract

With the development of high-speed communication services in public communication networks, there is a demand for the application of distributed processing based on the concurrent object-oriented paradigm to the communication service control software. This paper discusses message communication facilities with a high processing ability per unit time, a short processing time, and a high reliability that can be applied to communication service control. In the proposed facilities, a buffer with the fixed length used to store the message content is allocated to the shared space in each communication control node, which can be accessed from all user space. By passing the pointer to the buffer, communication processing is made efficient and management overhead is reduced. Reliability is improved by memory that checks unauthorized access to the message buffer in the shared space. In order to realize the efficient communication of large-scale messages, outline message communication is supported, using the page map switching and copy-on-write control. In internode communication, the internode communication control object multiplexes and processes the messages by the connection set between the nodes. Between the internode communication control object and the transmission/reception object, the number of copies is reduced by passing the pointer to the buffer.