| author | Christian Urban <christian dot urban at kcl dot ac dot uk> |
| Sun, 06 Jul 2014 22:56:29 +0100 | |
| changeset 286 | e0f6eb0b5d53 |
| child 287 | 1d273a9f953b |
| permissions | -rw-r--r-- |
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" |
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"http://www.w3.org/TR/REC-html40/loose.dtd"> |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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<HEAD> |
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<TITLE>Priority Inversion Protocol</TITLE> |
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<BASE HREF="http://www.dcs.kcl.ac.uk/staff/urbanc/"> |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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</HEAD> |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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<BODY TEXT="#000000" |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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BGCOLOR="#4169E1" |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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LINK="#0000EF" |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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VLINK="#51188E" |
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ALINK="#FF0000"> |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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<TABLE WIDTH="100%" |
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BGCOLOR="#4169E1" |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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BORDER="0" |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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FRAME="border" |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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CELLPADDING="10" |
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CELLSPACING="2" |
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RULES="all"> |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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<!-- right column --> |
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<TR> |
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<TD BGCOLOR="#FFFFFF" WIDTH="75%"> |
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<H2>Proving the Priority Inheritance Protocol Correct</H2> |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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By Xingyuan Zhang, Christian Urban and Chunhan Wu |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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<p> |
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In real-time systems with threads, resource locking and |
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priority scheduling, one faces the problem of Priority |
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Inversion. This problem can make the behaviour of threads |
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unpredictable and the resulting bugs can be hard to find. The |
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Priority Inheritance Protocol is one solution implemented in many |
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systems for solving this problem, but the correctness of this solution |
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has never been formally verified in a theorem prover. As already |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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pointed out in the literature, the original informal investigation of |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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the Property Inheritance Protocol presents a correctness "proof" for |
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an incorrect algorithm. In this paper we fix the problem of |
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this proof by making all notions precise and implementing a variant of |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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a solution proposed earlier. Our formalisation in Isabelle/HOL |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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uncovers facts not mentioned in the literature, but also shows how to |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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efficiently implement this protocol. Earlier correct implementations |
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were criticised as too inefficient. Our formalisation is based on |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Paulson's inductive approach to verifying protocols. |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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<BR><BR> |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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The source code can be downloaded |
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<A HREF="http://www4.in.tum.de/~urbanc/cgi-bin/repos.cgi/prio">here</A>. |
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<BR><BR><BR><BR> |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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</TABLE> |
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<P><!-- Created: Tue Mar 4 00:23:25 GMT 1997 --> |
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<!-- hhmts start --> |
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Last modified: Thu Feb 13 20:24:23 CET 2012 |
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<!-- hhmts end --> |
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<a href="http://validator.w3.org/check/referer">[Validate this page.]</a> |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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</BODY> |
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</HTML> |