Progress in cancellable, multi-threaded, control software
Identifieur interne : 000A80 ( Main/Exploration ); précédent : 000A79; suivant : 000A81Progress in cancellable, multi-threaded, control software
Auteurs : K. Shortridge [Australie] ; T. J. Farrell [Australie]Source :
- Proceedings of SPIE, the International Society for Optical Engineering [ 0277-786X ] ; 2010.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
The AAO's DRAMA data acquisition environment provides a very successful flexible model for instrument control tasks based on the concept of named 'actions'. A task can execute a number of these actions simultaneously, and - something we have found to be of paramount importance in control systems - they can be cancelled cleanly if necessary. However, this flexibility has been achieved by use of what is essentially a collaborative multi-threading system, each action running in short 'stages' in a single-threaded task. The original DRAMA design pre-dated the general availability of multi-threading systems, but until now we have been reluctant to move to a multi-threading model because of the difficulties associated with attempting to cleanly cancel a thread stuck in a blocking operation. We now believe we have an acceptable solution to this problem, and are modifying the internals of DRAMA to produce an approach - compatible with the existing system - that will allow individual actions to execute in separate threads. It will be able to carry out dialogues with hardware in a much simpler manner than has been allowed so far, and this should simplify the coding of DRAMA tasks enormously.
Affiliations:
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Le document en format XML
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Farrell</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Anglo-Australian Observatory, PO Box 296</s1><s2>Epping, NSW 1710</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Epping, NSW 1710</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">11-0055948</idno><date when="2010">2010</date><idno type="stanalyst">PASCAL 11-0055948 INIST</idno><idno type="RBID">Pascal:11-0055948</idno><idno type="wicri:Area/PascalFrancis/Corpus">000067</idno><idno type="wicri:Area/PascalFrancis/Curation">000178</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000086</idno><idno type="wicri:doubleKey">0277-786X:2010:Shortridge K:progress:in:cancellable</idno><idno type="wicri:Area/Main/Merge">000A85</idno><idno type="wicri:Area/Main/Curation">000A80</idno><idno type="wicri:Area/Main/Exploration">000A80</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Progress in cancellable, multi-threaded, control software</title><author><name sortKey="Shortridge, K" sort="Shortridge, K" uniqKey="Shortridge K" first="K." last="Shortridge">K. Shortridge</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Anglo-Australian Observatory, PO Box 296</s1><s2>Epping, NSW 1710</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Epping, NSW 1710</wicri:noRegion></affiliation></author><author><name sortKey="Farrell, T J" sort="Farrell, T J" uniqKey="Farrell T" first="T. J." last="Farrell">T. J. Farrell</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Anglo-Australian Observatory, PO Box 296</s1><s2>Epping, NSW 1710</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Epping, NSW 1710</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Proceedings of SPIE, the International Society for Optical Engineering</title><title level="j" type="abbreviated">Proc. SPIE Int. Soc. Opt. 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Eng.</title><idno type="ISSN">0277-786X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Availability</term><term>Blocking</term><term>Bolted joint</term><term>Breaking in</term><term>Data acquisition</term><term>Flexibility</term><term>Modeling</term><term>Multithread</term><term>Screwed joint</term><term>System identification</term><term>Thread (software)</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Identification système</term><term>Disponibilité</term><term>Multitâche</term><term>Processus léger (logiciel)</term><term>Saisie donnée</term><term>Flexibilité</term><term>Rodage</term><term>Assemblage boulonné</term><term>Assemblage vissé</term><term>Modélisation</term><term>Blocage</term><term>.</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The AAO's DRAMA data acquisition environment provides a very successful flexible model for instrument control tasks based on the concept of named 'actions'. A task can execute a number of these actions simultaneously, and - something we have found to be of paramount importance in control systems - they can be cancelled cleanly if necessary. However, this flexibility has been achieved by use of what is essentially a collaborative multi-threading system, each action running in short 'stages' in a single-threaded task. The original DRAMA design pre-dated the general availability of multi-threading systems, but until now we have been reluctant to move to a multi-threading model because of the difficulties associated with attempting to cleanly cancel a thread stuck in a blocking operation. We now believe we have an acceptable solution to this problem, and are modifying the internals of DRAMA to produce an approach - compatible with the existing system - that will allow individual actions to execute in separate threads. It will be able to carry out dialogues with hardware in a much simpler manner than has been allowed so far, and this should simplify the coding of DRAMA tasks enormously.</div></front></TEI><affiliations><list><country><li>Australie</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Shortridge, K" sort="Shortridge, K" uniqKey="Shortridge K" first="K." last="Shortridge">K. Shortridge</name></noRegion><name sortKey="Farrell, T J" sort="Farrell, T J" uniqKey="Farrell T" first="T. J." last="Farrell">T. J. Farrell</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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