Message-Passing Services

  • A. Udaya Shankar
Chapter

Abstract

This chapter presents several message-passing services, or channels for short.A channel allows a user at one location to transmit a message to be received by a user at another location. Because a channel is a service that is spread over different locations, users access the service via multiple systems, one at each location (unlike the previous lock service and bounded-buffer service). Specifically, a channel has a set of addresses, each identifying a location. (MAC addresses, IP addresses, and URLs are examples of addresses.) At each address there is a system within the channel, referred to as an access system, with which users interact. Figure 4.1 illustrates a channel where each access system provides functions tx(k,msg), to transmit message msg to address k, and rx(), to receive a message. Messages are sequences. We require channels to have at least one address. Although a channel with one address doesn’t do anything, it can be convenient for writing programs that use the channel.

Keywords

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • A. Udaya Shankar
    • 1
  1. 1.Department of Computer ScienceUniversity of MarylandCollege ParkUSA

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