A Study on a Distributed Operating System for Database Processing

今年我们设计了Xero分布式操作系统的中心模块。我们还实现了以下四个模块的第一个版本。动态多线程管理动态多线程管理的概念已经细化，分为两个概念：上下文和线程。这种改进的结果是，我们可以以完全透明的方式管理易失性数据和持久性数据。Xero的总体设计，包括上下文和线程的描述，将发表在《信息处理杂志》上。我们设计并实现了一种新的多线程机制，该机制基于用户级模块和内核级模块的协作。我们在COMPSAC‘91.2中公布了这一结果。利用远程过程调用进行进程间通信为异构型分布式通信设计了高阶远程过程调用技术。该技术使运行在不同硬件体系结构上的进程能够传递静态类型的数据，包括指针和高阶函数。我们还实现了分布式C语言，这是该技术在C语言中的应用。我们将在《计算机软件》杂志中介绍分布式C语言的设计问题。持久化对象管理基于复杂对象的概念，设计并实现了管理二级存储数据的持久化对象管理器。为了加速复杂对象之间的导航操作，我们引入了持久缓存技术。我们将在IEEE软件工程会刊和IPSJ.4年度大会上公布这些研究的结果。利用元组空间集成访问对象我们设计了分布式共享库，这是一个基于元组空间概念的分布式信息管理系统。我们实现了该模块的一个原型。

We designed the central modules of the XERO distributed operating system this year. We implemented the first version of the following four modules as well.1. Dynamic multithreads management The concept of dynamic multithreads management has been refined and divided into two concepts : contexts and threads. As a result of this refinement, we can manage volatile data and persistent data in a completely transparent manner. The overall design of XERO, including the description of contexts and threads, will be published in Journal of Information Processing.We designed and implemented a new multithreads mechanism, which is based on the cooperation of user and kernel level modules. We presented this result in COMPSAC '91.2. Interprocess communication with remote procedure calls We designed the higherorder remote procedure call technique for heterogeneous distributed communication. This technique enables processes running on different hardware architectures to pass statically typed data including pointers and higher-order functions.We also implemented the distributed C language, which is an application of this technique to the C language. We will present the design issues of the distributed C language in Computer Software, the journal of JSSST.3. Persistent Object Management We designed and implemented the persistent object manager that manages data on the secondary storage based on the concept of complex object. We involved the persistent caching technique in order to speed up navigational operations among complex objects. We will present the result of these studies in IEEE Transactions on Software Engineering and the Annual Convention of IPSJ.4. Integrated Access to Objects using Tuple Spaces We designed the distributed shared repository, which a distributed information management system based on the concept of tuple spaces. We implemented a prototype of this module.