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The Use of POSIX in Real-time Systems, Assessing its Effectiveness and Performance
September 2000
Kevin M. Obenland, The MITRE Corporation
ABSTRACT
The POSIX standard promotes portability of applications across
different operating system platforms. This is especially important
for applications designed for longevity, where the hardware and
software infrastructure may change during the application’s life
cycle. However in real-time systems, where predictability and low
overhead are important, portability is often sacrificed. In this
paper we will discuss the use of POSIX® in real-time systems,
including the POSIX real-time and thread extensions. We will first
discuss what POSIX covers, and the differences that still exist
between operating system implementations. We will then look at
the performance of various POSIX mechanisms, using as case
studies a general purpose OS (SolarisTM 8) and a real-time
operating system (LynxOS®).
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