为满足前面要求 当前实时操作系统应包括以下特征 Fast process or thread switch (快速进程或线程切换) Small size(系统小) Ability to respond to external interrupts quickly (快速响应外部中断的能力) Multitasking with interprocess communication tools such as semaphores, signals, and events (通过信号量、信号和事件之类进程通信工具,实现多 任务处理) Use of special sequential files that accumulate data at a fast rate(使用特殊的顺序文件,可快 速存储数据)
为满足前面要求, 当前实时操作系统应包括以下特征: • Fast process or thread switch (快速进程或线程切换) • Small size(系统小) • Ability to respond to external interrupts quickly (快速响应外部中断的能力) • Multitasking with interprocess communication tools such as semaphores, signals, and events (通过信号量、信号和事件之类进程通信工具,实现多 任务处理) • Use of special sequential files that accumulate data at a fast rate(使用特殊的顺序文件,可快 速存储数据)
为满足前面要求, 当前实时操作系统应包括以下特征: Preemptive scheduling base on priority (基于优先级剥夺式调度) Minimization of intervals during which interrupts are disabled (最小化禁止中断的时间间隔) elay tasks for fixed amount of time (能使任务延迟一固定的时间间隔) Special alarms and timeouts (特别的报警和超时设定)
为满足前面要求, 当前实时操作系统应包括以下特征: • Preemptive scheduling base on priority (基于优先级剥夺式调度) • Minimization of intervals during which interrupts are disabled (最小化禁止中断的时间间隔) • Delay tasks for fixed amount of time (能使任务延迟一固定的时间间隔) • Special alarms and timeouts (特别的报警和超时设定)
Scheduling of a real-Time process Rea- Time Scheduling(实时调度) Deadline Scheduling(截止时间调度) Rate monotonic scheduling(速率单调调度)
• Scheduling of a Real-Time Process • Real-Time Scheduling(实时调度) • Deadline Scheduling(截止时间调度) • Rate Monotonic Scheduling(速率单调调度)
Scheduling of a real- Time Process Round robin preemptive Scheduler(基于时 间片的轮转调度法) Priority-driven Nonpreemptive Scheduler(Is 于优先级非剥夺调度法) Priority- driven Preemptive Scheduler(基于优 先级的剥夺调度法) Immediate Preemptive Scheduler(立即剥夺调 度法)
Scheduling of a Real-Time Process • Round Robin Preemptive Scheduler(基于时 间片的轮转调度法) • Priority-driven Nonpreemptive Scheduler(基 于优先级非剥夺调度法) • Priority-driven Preemptive Scheduler(基于优 先级的剥夺调度法) • Immediate Preemptive Scheduler(立即剥夺调 度法)
Round robin preemptive scheduler (基于时间片的轮转调度法) ·响应时间在秒级 广泛应用于分时系统,也可用于一般的实时信 息处理系统 不适合于要求严格的实时控制系统
Round Robin Preemptive Scheduler (基于时间片的轮转调度法) • 响应时间在秒级 • 广泛应用于分时系统,也可用于一般的实时信 息处理系统 • 不适合于要求严格的实时控制系统