Constraints on Tasks (RTOS view Arrival Release Completion 0 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):基于msg 。 Resource constraints Data dependence? Mutual exclusion constraints Resource access protocolsConstraints on Tasks（RTOS view） • Timing(定时) constraints – Release time • Relative to arriving time – Deadline • Absolute deadline • Precedence( Precedence(优先) constraints ) constraints，偏序 – Temporal order：Temporal dependence • temporal distance： “完成时间”之差 – Causal order：Causal dependence • Happen-before(Lamport)：基于msg • Resource constraints – Data dependence？ – Mutual exclusion constraints • Resource access protocols