组合事务块及其在C语言和FOXPRO中的实现

高级程序设计语言（如Ｃ语言）和数据库系统的嵌套使用，作为一种有效的数据操纵和管理结构，目前在传统的离线或在线事务处理系统，以及智能控制系统中得到了广泛应用．这些应用的特点之一是要求系统具有很高的可靠性．文中提出了一种称为组合事务块的新颖容错原语，详细论述了它在Ｃ语言和ＦＯＸＰＲＯ中的实现方案．本质上，组合事务块是一种将数据容错、程序容错及算法容错结合起来的混合容错机制．文中还分析了组合事务块在冗余处理机上的执行时间，并用软件实验验证了它的容错特性．

THE COMBINATIONAL TRANSACTION BLOCK AND ITS IMPLEMENTATION IN C LANGUAGE AND FOXPRO

A novel fault tolerant primitive, called combinational transaction block (CTB), is presented here. It is constructed based on the principles of N version programming, recovery block, and dynamic redundancy structure of hardware fault tolerance. Therefore, CTB can be considered as a combinational fault tolerant mechanism for algorithms, programs and data. Its implementation in C language and FOXPRO is discussed in detail. The executing time of CTB on redundant processor systems is analyzed. The availability of CTB is demonstrated by software fault tolerant experiments.