A Process Health Status Service for Safety Related Systems Using TT/ET Communication Scheduling

C. Bergenhem, J. Karlsson
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引用次数: 2

Abstract

This paper describes a health status protocol for distributed real-time systems that use TTCAN, Flexray, or other networks which support both time-triggered and event-triggered communication. The protocol allows a group of co-operating processes to establish a consistent view of each other¿s health status over time. It extends the instantaneous view, of operational status of each process, provided by a process group membership protocol. The health status and membership protocols are intended for systems where processes (not nodes) are considered the smallest unit of failure, and where process failures can be detected and recovered locally by the host node. Such systems require a decision function that determines whether a process failure is temporary (the process is being recovered by the host node) or permanent (local recovery is not possible or was unsuccessful). Our protocol ensures that such decisions are made consistently among correct nodes despite symmetrical and asymmetrical omission failures.
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使用TT/ET通信调度的安全相关系统的进程健康状态服务
本文描述了使用TTCAN、Flexray或其他支持时间触发和事件触发通信的网络的分布式实时系统的健康状态协议。该议定书允许一组合作进程建立对彼此长期健康状况的一致看法。它扩展了由流程组成员协议提供的每个流程的操作状态的即时视图。健康状态和成员协议适用于这样的系统:进程(而不是节点)被认为是最小的故障单元,并且进程故障可以由主机节点在本地检测和恢复。这样的系统需要一个决策函数来确定进程故障是暂时的(进程正在由主机节点恢复)还是永久性的(本地恢复不可能或不成功)。我们的协议确保在对称和不对称遗漏失败的情况下,在正确的节点之间一致地做出此类决策。
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