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Protecting Software Components from Interference in an ISO 26262 System




March 2013
9 pages
Protecting Software Components from Interference in an ISO 26262 System

Automobile safety often depends on the correct operation of software-based systems constructed from many different components. Good design requires that these components be isolated from each other on multiple axes so that they do not inadvertently interfere with each other. In this paper we present techniques that can help a) ensure that a system implements the component isolation required by ISO 26262, and b) demonstrate that this isolation has been implemented.

Contents

Interference The isolation axes Isolation techniques Validation techniques Deadlock and livelock avoidance Conclusion [+]





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Author
Chris Hobbs
chobbs@qnx.com

Chris Hobbs

Chris Hobbs is a kernel developer at QNX, specializing in "sufficiently-available" software: software created with the minimum development effort to meet the availability and reliability needs of the customer; and in producing safe software (in conformance with IEC61508 SIL3). He is also a specialist in WBEM/CIM device, network and service management, and the author of A Practical Approach to WBEM/CIM Management (2004).

In addition to his software development work, Chris is a flying instructor, a singer with a particular interest in Schubert's Lieder, and the author of several books, including Learning to Fly in Canada (2000) and The Largest Number Smaller than Five (2007). His blog, Software Musings, focuses "primarily on software and analytical philosophy".

Chris Hobbs earned a B.Sc., Honours in Pure Mathematics and Mathematical Philosophy at the University of London's Queen Mary and Westfield College.



Author
Yi Zheng
yzheng@qnx.com

Yi Zheng

Yi Zheng is the product manager responsible for the safety product certified to IEC 61508 SIL3 and security product certified to Common Criteria EAL4+ at QNX Software Systems. She also manages the QNX Neutrino RTOS and the QNX Momentics tool suite.

Prior to joining QNX, Yi worked at Entrust Technologies, Autodesk and Nortel Networks, designing a wide range of software applications. She holds a Bachelor's in Computer Science from Carleton University, a Master's in Business Administration from Queens University, and is a Certified Management Accountant.

See Also...

Protecting Applications Against Heisenbugs

Using an IEC 61508-Certified RTOS Kernel for Safety-Critical Systems

Building Functional Safety into Complex Software Systems, Part I

Building Functional Safety into Complex Software Systems, Part II

HTML5-Hardware Communication with PPS Messaging

Using Dynamic Software Analysis to Support Medical Device Approval

Ten Truths about Building Safe Embedded Software Systems

The Dangers of Over-Engineering a Safe System


Other whitepaper topics: Recent, Automotive, German Whitepapers, HMI + Graphics, Industrial, Medical, Multimedia + Acoustics, Networking, Operating Systems, Security + Defense, Safe Systems, Tools