Design and Implementation of a Distributed Operating System

分布式操作系统Theta是为了支持分布式系统上的应用程序而开发的。通常，操作系统处理许多和各种各样的数据结构，因此它们的描述变得复杂和困难。采用面向对象技术，通过对系统的抽象，改进了系统的描述和生成。用C++和COB描述的新版本的Theta，与面向对象技术的效率，已与以前的C版本进行了比较。本研究的第一个目的是评估这种比较的结果。并发性和可靠性是分布式系统的主要问题。传统的分布式操作系统只关心并发性。这是由于操作系统尚未在分布式环境中使用。另一方面，分布式数据库系统提高了可靠性。本研究的第二个目的是将这些技术应用于操作系统。首先，操作系统用对象表示。其次，这些对象是由持久化对象实现的。这样就可以用持久对象组成操作系统，实现持久化操作系统。

The distributed operating system Theta has been developed with the aim to support applications on distributed systems. Generally, operating systems handle many and various kinds of data structures, so their description has become complex and difficult. Using object oriented techniques and, by the abstraction of the system, their description and production are improved. The efficiency of a new version of Theta described by C++ and COB, with object oriented techniques, has been compared with its previous C version. The first aim of this research is to evaluate results of such comparison.Concurrency and reliability are main issues of the distributed systems. Conventional distributed operating systems have been concerned only with concurrency. This is due to the fact that operating systems have not been used in distributed environments. On the other hand, distributed database systems had improved reliability. The second aim of this research is to apply those techniques to an operating system. Firstly, operating system is represented by objects. Secondly, those objects are realized by persistent objects. Thus the operating system can be composed by persistent objects, and persisteny operating system may be realized.