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Pipe-calculus: Difference between revisions
→Connection with process calculus
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There are also notable differences. | There are also notable differences. | ||
* Communication primitives in mainstream process calculi often inseparably unite two conceptual steps: the selection of a communication | * Communication primitives in mainstream process calculi often inseparably unite two conceptual steps: the selection of a communication channel and the act of message sending. For example [[wikipedia:pi-calculus|Π-calculus]] <ref> Joachim Parrow: [https://courses.cs.vt.edu/~cs5204/fall05-kafura/Papers/PICalculus/parrow~2.pdf An Introduction to the Π-Calculus], chapter to appear in Handbook of Process Algebra, ed. Bergstra, Ponse and Smolka, | ||
Elsevier</ref> defines ''input prefixing'' <math>c\left(x\right).P</math> and ''output prefixing'' <math>\overline{c} \langle y \rangle.P</math> to denote receiving a name via channel <math>c</math> and sending a name via channel <math>c</math> respectively, before proceeding as <math>P</math>. Although one can introduce as a convention '''synchronization''' where the communicated message is ignored, and '''broadcast''' where a group of processes are receiving messages on the same channel. In pipe-calculus these steps are separated by design. | Elsevier</ref> defines ''input prefixing'' <math>c\left(x\right).P</math> and ''output prefixing'' <math>\overline{c} \langle y \rangle.P</math> to denote receiving a name via channel <math>c</math> and sending a name via channel <math>c</math> respectively, before proceeding as <math>P</math>. Although one can introduce as a convention '''synchronization''' where the communicated message is ignored, and '''broadcast''' where a group of processes are receiving messages on the same channel. In pipe-calculus these steps are separated by design. | ||
* In pipe-calculus there is no counterpart of '''hiding''' that prevents interference between two groups of processes that are using the same channel name for communication. Since there is no general, bidirectional parallel composition, we don't need a hiding primitive. The pipe operation naturally restricts communication to a pipeline. | * In pipe-calculus there is no counterpart of '''hiding''' that prevents interference between two groups of processes that are using the same channel name for communication. Since there is no general, bidirectional parallel composition, we don't need a hiding primitive. The pipe operation naturally restricts communication to a pipeline. | ||