多处理器的多资源实时读/写锁

Bryan C. Ward, James H. Anderson
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引用次数: 21

摘要

细粒度锁定协议允许同一任务同时持有多个锁。在实时多处理器系统的情况下,此类协议的先前工作只考虑互斥约束。这在某些资源访问为只读的系统中限制了并发性,这是不可接受的。为了纠正这种情况,提出了一种最近提出的细粒度协议的变体,称为实时嵌套锁定协议(RNLP),它支持并发读取。这种变体的最坏情况阻塞并不比现有的粗粒度实时读/写锁定协议差(通常更好),同时允许额外的并行性。提出了考虑可调度性(即验证时间约束的能力)和实现相关开销的协议的实验评估。这些评估表明,RNLP(互斥锁和建议的读/写变体)比现有的粗粒度锁定协议提供了更好的可调度性,并且实际上是可实现的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multi-resource Real-Time Reader/Writer Locks for Multiprocessors
A fine-grained locking protocol permits multiple locks to be held simultaneously by the same task. In the case of real-time multiprocessor systems, prior work on such protocols has considered only mutex constraints. This unacceptably limits concurrency in systems in which some resource accesses are read-only. To remedy this situation, a variant of a recently proposed fine-grained protocol called the real-time nested locking protocol (RNLP) is presented that enables concurrent reads. This variant is shown to have worst-case blocking no worse (and often better) than existing coarse-grained real-time reader/writer locking protocols, while allowing for additional parallelism. Experimental evaluations of the proposed protocol are presented that consider both schedulability (i.e., the ability to validate timing constraints) and implementation-related overheads. These evaluations demonstrate that the RNLP (both the mutex and the proposed reader/writer variant) provides improved schedulability over existing coarse-grained locking protocols, and is practically implementable.
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