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Real Time Operating Systems QNx RTOS 6.1. Professor: Mohamed Khalil CSE 8343 GROUP-A1 Anita Kanuganti. Agenda. Overview Features Examples of RTOS QNx RTOS v 6.1 System Architecture Task Handling Method Memory Management Method Interrupt Handling Method Internet Support

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Real Time Operating Systems QNx RTOS 6.1

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Real time operating systems qnx rtos 6 1

Real Time Operating SystemsQNx RTOS 6.1

Professor: Mohamed Khalil

CSE 8343

GROUP-A1

Anita Kanuganti


Agenda

Agenda

  • Overview

  • Features

  • Examples of RTOS

  • QNx RTOS v 6.1

    • System Architecture

    • Task Handling Method

    • Memory Management Method

    • Interrupt Handling Method

    • Internet Support

    • Most widely used Tools

    • Positive & Negative points

      Conclusion

  • References


Overview

Overview


Real time systems

Real time systems

  • “Real-time computing is computing where system correctness depends not only on the correctness of the logical result of the computation but also on the result delivery time”


Real time operating systems rtos

Real time operating systems(RTOS)

  • A good RTOS can be defined as one that has a bounded (predictable) behavior under all system load scenarios (simultaneous interrupts and thread execution.


Features

Features


Rtos features

RTOS Features:

  • Small Footprint

  • Preemptible

  • Multi-architecture

  • Predictable response times to electronic events


Examples

Examples


Examples1

Examples

  • QNx

  • VxWorks

  • Windows NT

  • Windows 2k

  • Linux

  • Linux/RT


Qnx rtos v6 1

QNx RTOS v6.1


Introduction to qnx rtos v 6 1

Introduction to QNx RTOS v 6.1

  • QNx is a RTOS from QNx Software Systems Ltd

  • Commercial POSIX-compliant OS

  • Designed for embedded systems

  • Contains micro-kernel,internet software, including a web browser and server, embeddable graphical user interface, comprehensive software library


Qnx system architecture

QNx System Architecture

Micro-kernel Architecture:

Processes

P1

IPC

Network

Interface

Network

Manager

P2

Scheduler

P3

Hardware Interrupt

Redirector

P4

Interrupts


Cont d qnx system architecture

Cont’dQNx - System Architecture

  • True client-server architecture

  • Message-based OS

  • Supports SMP and high availability features

  • Advantages:

    • Robustness

    • Reliable

  • Disadvantage:

    • Overhead caused by memory protection


  • Task handling method

    Task Handling Method

    • Processes & Threads

    • Scheduling Policies

      • Prioritized FIFO

      • Round – Robin scheduling

      • Adaptive

      • Sporadic


    Memory management method

    Memory Management Method

    • Virtual memory supported by paging mechanisms of processor

    • Swapping disk enabled by “unlock” calls

    • Demand paging not implemented due to real time nature

    • Full virtual memory protection

    • Physical page size is 4k


    Interrupt handling method

    Interrupt Handling Method

    • Interrupt handled in nested and prioritized fashion

    • Interrupt service routine(ISR) runs in the context of the thread that attached it

    • ISR has its own stack

    • Interrupt to task communication through signals and pulses


    Internet support

    Internet Support

    • Voyager Web Server: an HTTP server to serve web pages

    • Voyager Web Browser for viewing information

    • Voyager SDK to build internet enabled applications


    Most widely used tools

    Most widely used Tools

    • Metrowerks Codewarrior IDE

    • GCC Toolkit

    • Photon developer’s toolkit to develop photon user interfaces

    • TCP/IP toolkit


    Qnx rtos v6 11

    Positive points

    Fast and predictable

    Excellent architecture for distributed Robust systems

    Good Platform support

    Negative points

    Documentation

    QNx RTOS v6.1


    Conclusion

    Conclusion


    Conclusion1

    Conclusion

    • The system can be seamlessly distributed over several nodes, and is network transparent

    • True client-server architecture which improves its robustness and reliability

    • System’s performance is fast and predictable

    • As opposed to the earlier versions of QNx RTOS, which only supported the Intel x86 family of processors, version 6.x also supports MIPS, PowerPC, StrongARM and SH4


    References

    References:

    • “Real-Time Systems & Software” Alan C. Shaw.

    • http://www.dedicated-systems.com/Encyc/


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