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Remarks on “some comments on concurrent readers and writers” by Reidar Conradi

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Summary

The Synchronization primitive P * was introduced by Conradi in order to present a more compact and efficient algorithm for synchronization of concurrent readers and writers. Unfortunately, Conradi's solutions fail when the conventional definitions of semaphores are used in conjunction with this primitive. This paper proposes a definition of the semaphore operations P, V and P * that make Conradi's readers-writers solutions correct. This definition is compatible with the definition given by Dijkstra.

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References

  1. Conradi, R.: Some comments on “Concurrent Readers and Writers”. Acta Informat. 8, 335–340 (1977)

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  2. Dijkstra, E.W.: Cooperating sequential processes. In: Programming languages (F. Genuys, ed.). London-New York: Academic Press 1968

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  3. Dijkstra, E.W.: Hierarchical ordering of sequential processes. Acta Informat. 1, 115–138 (1971)

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  4. Dijkstra, E.W.: The structure of the THE-Multiprogramming system. Comm. ACM 11, 341–346 (1968)

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Authors and Affiliations

  1. Department of Mathematical Sciences, The University of Texas at Dallas, 75080, Richardson, TX, USA

    Abraham Silberschatz & Brian Johnson

Authors
  1. Abraham Silberschatz
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  2. Brian Johnson
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Additional information

This work was partially supported by the National Science Foundation Grant Number MCS7702463

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Silberschatz, A., Johnson, B. Remarks on “some comments on concurrent readers and writers” by Reidar Conradi. Acta Informatica 11, 57–60 (1978). https://doi.org/10.1007/BF00264599

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  • DOI: https://doi.org/10.1007/BF00264599

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