一种基于虚拟对象的进程检查点实现方法

检查点回卷恢复策略是实现软件容错的一种重要方法。基于虚拟对象策略的进程检查点实现方法把应用层与系统层的直接交互被重定向为应用层与虚拟对象层的交互以及虚拟对象层与系统层的交互。故障恢复时,虚拟对象层重新和系统层捆绑结合,使得进程环境故障前后的差异性对应用层透明。另外,基于虚拟对象的检查点策略不须要进行对象句柄转换,避免了对象句柄转换所带来的开销。该方法具有开销小的特点,并且支持多线程及线程间的同步。

Checkpointing Process Based on Virtual Object Framework

Rollback recovery is an efficient approach to fault-tolerance of software application. This paper proposes a process checkpoint implementation scheme based on virtual object framework. In our scheme, the direct transaction between application layer and system layer is redirected to the transaction between application layer and virtual object layer, then between virtual object layer and system layer. When process recovers from failure, virtual objects rebind themselves with system layer, with the different process environment transparent to application layer. Additionally, the conversion between virtual handle and real handle can be omitted in our scheme, reducing the fault-free overhead. Our scheme holds the features of low overhead, good adaptability, and supporting multithread and synchronization.