Constraints on Tasks (OS view Arrival Release Completion ·Timing(定时)constraints (invocation)】 -Release time Relative to arriving time Time -Deadline Jitter Execution ·Absolute deadline Response Time o Precedence(优先)constraints,偏序 Temporal order:Temporal dependence ·temporal distance:“完成时间"之差 - Causal order:Causal dependence Happen-before(Lamport) Resource constraints Data dependence ·Mutual exclusion Resource access protocolsConstraints on Tasks（OS view） • Timing(定时) constraints – Release time • Relative to arriving time – Deadline • Absolute deadline • Precedence(优先) constraints，偏序 – Temporal order：Temporal dependence • temporal distance： “完成时间”之差 – Causal order：Causal dependence • Happen-before(Lamport) • Resource constraints – Data dependence • Mutual exclusion • Resource access protocols UnRegistered