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TMOS: A Transactional Garbage Collector

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Persistent Object Systems: Design, Implementation, and Use (POS 2000)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 2135))

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Abstract

Defining persistence in terms of reachability is fundamental to achieving orthogonality of persistence. It is implicit to the principles of orthogonal persistence and is a part of the ODMG 3.0 data objects standard. Although space reclamation in the context of persistence by reachability can be achieved automatically using garbage collection, relatively few papers address the problem of implementing garbage collection in a transactional storage system. A transactional GC algorithm must operate correctly in the face of failure, and in particular must deal with the problem of transaction abort, which by undoing changes such as the deletion of references, subverts the GC reachability axiom of ‘once garbage always garbage’.

In this paper we make two key contributions. First, we present a generic approach to the design of transactional collectors that promotes clarity, generality, and understandability, and then using this approach, we present a new transactional garbage collection algorithm, TMOS. Our design approach brings together three independent components—a mutator, a transactional store, and a GC algorithm. TMOS represents the application of the Mature Object Space family of GC algorithms to the transactional context through our approach to transactional GC design.

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Author information

Authors and Affiliations

  1. Department of Computer Science, Australian National University, Canberra, ACT, 0200, Australia

    John Zigman

  2. Department of Computer Science, University of Massachusetts, Amherst, MA, 01003, USA

    Stephen M. Blackburn & J. Eliot B. Moss

Authors
  1. John Zigman
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  2. Stephen M. Blackburn
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  3. J. Eliot B. Moss
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Editor information

Editors and Affiliations

  1. School of Computer Science, University of St. Andrews, North Haugh, St. Andrews, Fife, KY16 9SS, UK

    Graham N. C. Kirby  & Alan Dearle  & 

  2. Simula Research Laboratory, P.O. Box 1080, Blindern, 0316, Oslo, Norway

    Dag I. K. Sjøberg

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© 2001 Springer-Verlag Berlin Heidelberg

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Zigman, J., Blackburn, S.M., Moss, J.E.B. (2001). TMOS: A Transactional Garbage Collector. In: Kirby, G.N.C., Dearle, A., Sjøberg, D.I.K. (eds) Persistent Object Systems: Design, Implementation, and Use. POS 2000. Lecture Notes in Computer Science, vol 2135. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45498-5_12

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  • DOI: https://doi.org/10.1007/3-540-45498-5_12

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-42735-3

  • Online ISBN: 978-3-540-45498-4

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