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Real Time Operating Systems for Networked Embedded Systems Subhashis Banerjee Indian Institute of Technology Delhi [email_address] With: Soumyadeb Mitra, Nitin Rajput, M.Balakrishnan

Fire alarm system: an example Sensors: microcontroller based Controllers: ARM based Central server Low bandwidth radio links TCP/IP over radio

Fire Alarm System ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RTOS: Target Architectures Processors MIPS Microcontrollers ~20 ARM7 100-133 ARM9 180-250 Strong ARM 206 Intel Xscale 400 Mips4Kcore 400 X86

Presentation Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Real Time System ,[object Object],[object Object],[object Object],[object Object]

Hard and Soft Real Time Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Hard and Soft Real Time Systems (Operational Definition) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Role of an OS in Real Time Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Features of RTOS’s ,[object Object],[object Object],[object Object],[object Object]

Scheduling in RTOS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scheduling Algorithms in RTOS ,[object Object],[object Object],[object Object],[object Object]

Scheduling Algorithms in RTOS ( contd) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Scheduling Algorithms in RTOS ( contd ) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Priority Scheduling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Resource Allocation in RTOS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Solutions to Priority Inversion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Other RTOS issues ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Linux for Real Time Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Interrupt Handling in Linux ,[object Object],[object Object],[object Object],[object Object],[object Object]

Other Problems with Linux ,[object Object],[object Object],[object Object],[object Object],[object Object]

Why Linux ,[object Object],[object Object],[object Object],[object Object]

RTLinux ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RTLinux ( contd ) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

rtker – Our RTOS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Pluggable Scheduler ,[object Object],[object Object],[object Object],[object Object]

Two Level Interrupt Handling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Other Features ,[object Object],[object Object],[object Object],[object Object],[object Object]

Other RTOS’s ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Other RTOS’s ( contd) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Peripheral devices and protocols ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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