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Developing components in the presence of re-entrance
Developing Components in the
Presence of Re entrance
Leonid Mikhajlov
Turku Centre for Computer Science
Lemminkaisenkatu A Turku
Finland
LeonidMikhajlov abo
Emil Sekerinski
McMaster University
Main Street West Hamilton
Ontario Canada LSK
EmilSekerinski mcmasterca
Linas Laibinis
Turku Centre for Computer Science
Lemminkaisenkatu A Turku
Finland
LinasLaibinis abo
Turku Centre for Computer Science
TUCS Technical Report No
February
ISBN X
ISSN
Abstract
Independent development of components according to their speci cations
is complicated by the fact that a thread of control can exit and reenter
the same component This kind of reentrance may cause problems as the
internal representation of a component can be observed in an inconsistent
state We argue that the adhoc reasoning used in establishing conformance
of components to their speci cations that intuitively appears to be correct
does not account for the presence of reentrance Such reasoning leads to
a conict between assumptions that component developers make about the
behaviour of components in a system resulting in the component reentrance
problem We formulate the modular reasoning property that captures the
process of independent component development and introduce two require
ments that must be imposed to avoid the reentrance problem Then we
de ne a customised theory of components component systems and compo
nent re nement which models the process of component development from
speci cations Using this theory we prove that the formulated requirements
are sucient to establish the modular reasoning property
Keywords software components modular reasoning software correctness
speci cation and veri cation methodology component reentrance
TUCS Research Group
Programming Methodology Research Group
Introduction
In this paper we study the problem which hinders the development of a
component market One of the characterist
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