BY: ADAM BAIR Real-Time Operating Systems

What’s a Real-Time System? - A computer system that requires computation to be correct and done before a specified time period expires. - Embedded in specialized devices.

Types of Real-Time Systems Hard real-time system Soft real-time system

System Characteristics Purpose Size Cost effective Timing Requirements

Memory Allocation Real-addressing mode Dynamic relocation register Virtual memory

Real-Time System Features Priority-based scheduling Preemptive kernel  Preemption points  Synchronized mechanisms Minimized latency  Interrupt latency  Dispatch latency  Priority-inheritance protocol

Real-Time CPU Scheduling Periodic Processes Admission-control algorithm Rate-Monotonic Scheduling Algorithm Earliest-Deadline-First Scheduling Algorithm

Sources time_operating_system time_operating_system time_system#History time_system#History Gagne, Galvin, Silberschatz. Operating System Concepts 8 th edition