【摘要】 现代主流操作系统已经广泛采用了多线程技术 .首先论述了多线程的基本概念 ,然后着重分析了 3种主要的多线程实现方案 :内核级线程、用户级线程和混合策略 ,然后介绍了多线程技术的应用 .还结合面向对象数据库管理系统 NODBMS的实现 ,介绍了如何应用多线程技术实现多用户事务处理 ,并提出了一个基于多线程技术实现的对象式数据库查询优化算法 ,该算法取得了较好的效果更多还原

【Abstract】 Multithread technology has been adopted in recently developed mainstream operating systems. Firstly the basic concepts of multithread are described. Secondly, three implementation methods of multithread mechanism that is user\|level threads, kernel\|level threads and combined approaches are discussed. Thirdly, application of multithread programming is introduced. Through the object\|oriented database management system NODBMS, how to use multithreads to realize multiple transaction processing is also introduced, and is proposed an effective query optimization algorithm of object\|oriented database system based on multithread technology.更多还原