实时系统中延迟和截止日期约束的区别

先决条件 – 实时系统中的时序约束
1.延迟约束：
延迟约束是实时系统中两个连续事件发生之间的最小时间间隔。如果事件发生在延迟约束之前，则称为延迟违规。两个事件发生的时间间隔应大于或等于延迟约束。
如果 D 是两个事件发生之间的实际时间间隔，而 d 是延迟约束，则D >= d 。

2. 期限限制：
最后期限约束是实时系统中两个连续事件发生之间的最大时间间隔。如果事件发生在截止日期约束之后，则事件的结果被认为是不正确的。两个事件发生的时间间隔应小于或等于截止时间约束。
如果 D 是两个事件发生之间的实际时间间隔，而 d 是截止日期约束，则D <= d 。

延迟和截止日期约束之间的区别：

DELAY CONSTRAINT	DEADLINE CONSTRAINT
It is the minimum time interval between occurrence of two consecutive events.	It is the maximum time interval between occurrence of two consecutive events.
It implies that after the occurrence of event E1, event E2 can occur only after the time elapsed is equal to delay constraint.	It implies that after the occurrence of event E1, event E2 must occur only before the time elapsed is equal to deadline constraint.
If D is the actual time interval between occurrence of two events and d is the delay constraint, then D >= d.	If D is the actual time interval between occurrence of two events and d is the deadline constraint, then D <= d.
Delay violation occurs here if an event occurs before delay constraint.	There is no such term as deadline violation if an event occurs after deadline constraint.
The result is not considered incorrect if event occurs before delay constraint.	The result is considered incorrect if event occurs after deadline constraint.
Delay Constraint under performance is classified as Response-Response (RR) and Stimulus-Response (SR).	Deadline Constraint under performance is classified as Stimulus-Response (SR) and Response-Response (RR).
Delay Constraint under performance is classified as Response-Stimulus (RS) and Stimulus-Stimulus (SS).	Deadline Constraint under performance is classified as Stimulus-Stimulus (SS) and Response-Stimulus (RS).