From: cis.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!howland.
Subject: Report available via FTP
Date: 21 Sep 93 14:33:37 GMT [thread overview]
Message-ID: <748622017.20183@minster.york.ac.uk> (raw)
A report entitled "Implementing Analysable Hard Real-time Sporadic Tasks in
Ada 9X", by A. Burns and A.J. Wellings is available by FTP from the following
site:
minster.york.ac.uk (IP address 144.32.128.41)
in the directory:
/pub/realtime/papers
in the file:
YCS209.ps.Z
The file is stored in compressed postscript format so be sure to set binary
mode when FTPing the report. The abstract of the report is as follows:
In this paper we illustrate how systems containing hard
real-time sporadic tasks can be analysed for their
worst case behaviour. In order to undertake this
schedulability analysis, it is necessary to define the
minimum inter-arrival time and/or maximum arrival
frequency of sporadic tasks. Furthermore, at run-time
it is essential to ensure that sporadic tasks are not
invoked more often than has been guaranteed by the
analysis. We assume that sporadics are invoked by
interrupts and that interrupts can be masked under
software control.
Sporadic tasks are often analysed using the notion
of bandwidth preserving sporadic servers within the
Rate Monotonic Scheduling Analysis scheme. At run-time
this requires the underlying kernel to support complex
execution time monitoring mechanisms. Unfortunately
such mechanisms are not generally supported by Ada 9X.
This paper shows that by using Deadline Monotonic
Scheduling Analysis there is no need to resort to
bandwidth preserving sporadic servers, and the
facilities available in Ada 9X can be used.
A number of other papers and reports written by the Real-Time Systems
Research Group at York are also available; the file INDEX in the directory
/pub/realtime/papers lists these.
--
Ken Tindell Internet : ken@minster.york.ac.uk
Computer Science Dept., Local FTP site: minster.york.ac.uk
University of York, Tel. : +44-904-433244
YO1 5DD, UK Fax. : +44-904-432708
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1993-05-27 10:08 Report available via FTP agate!howland.reston.ans.net!zaphod.mps.ohio-state.edu!cs.utexas.edu!utnu
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