| 摘要: |
| 文章讨论了在分布式多媒体系统中有优先次序约束的任务调度和资源共享问题.通过建立任 务优先次序的偏序关系,定义准正态调度概念,提出了任务调度算法QNES(quasi-normality －EDF－scheduler).该算法基于PCP(priority ceiling protocol)或SRP(stack resour ce policy)协议访问共享资源,具有抢占式、能处理任务的优先次序约束和访问共享资源的 特点,适合单机系统多媒体流的任务调度. |
| 关键词: 优先次序任务调度,准正态,资源共享,PCP(priority ceiling protocol),SRP(stack resource policy). |
| DOI： |
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| 基金项目:本文研究得到国家自然科学基金和国家科技部重点科技攻关项目专项基金资助. |
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| Scheduling Tasks with Precedence Constraints and Shared Resource for Multimedia Streams |
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ZHANG Zhan-jun,YANG Xue-liang
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| Abstract: |
| Some issues of scheduling tasks with precedence constraints and shared resource are discussed in this paper. The authors present the scheduling algorithm QNES ( quasi-normality－EDF－scheduler) by means of defining the notion of quasi- normality and making consistency of precedence constraints among tasks and parti al order on tasks. QNES can access shared resource based on PCP (priority ceilin g protocol) or SRP (stack resource policy) protocols, and has characters of preemption, dealing with precedence constraints among tasks and accessing sh ared resource, and is suitable to uni-processor systems. |
| Key words: Scheduling tasks with precedence constraints, quasi-normality, shared resource, PCP (priority ceiling protocol), SRP (stack resource policy). |
