Plánování úloh v systémech RT - II: neperiodické úlohy

aperiodic task, sporadic task, joint scheduling, hybrid scheduling, task server, background scheduling, polling server, deferrable server, priority exchange server, sporadic server

This article is the second one from the "Task scheduling in RT system" series. It builds on the first article, in which basic static and dynamic priority assignment policies were introduced for periodic RT tasks. Among nonperiodic tasks, the following groups are typically distinguished: aperiodic tasks (their interarrival times are unknown apriori) and sporadic tasks (their interarrival times are bounded). In this article, basic mechanisms of hybrid/joint scheduling of periodic and aperiodic RT tasks; a special attention is paid especially to task server mechanisms.