Download A Discipline of Multiprogramming: Programming Theory for by Jayadev Misra PDF

By Jayadev Misra

During this ebook, a programming version is built that addresses the basic problems with 'large-scale programming'. The method unifies numerous strategies from database thought, object-oriented programming and designs of reactive platforms. The version and the linked thought has been christened "Seuss." the main objective of Seuss is to simplify multiprogramming. To this finish, the worry of concurrent implementation is separated from the center software layout challenge. A application execution is known as a unmarried thread of regulate - sequential executions of activities which are selected in keeping with a few scheduling coverage. for this reason, it truly is attainable to cause in regards to the houses of a application from its unmarried execution thread.

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Additional info for A Discipline of Multiprogramming: Programming Theory for Distributed Applications (Monographs in Computer Science)

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H 1\ n = 0 -+ v,n:= true, 1 n = 1 -+ turn, n := false, 2 n=21\ (,u V turn) -+ n:=3 ~ n = 3 -+ v, n := false, 0 end{mutex} Proof of mutual exclusion We constructed program mutex through a series of transformations starting from the program that used a shared queue. Since mutex is a correct refinement of a correct mutual exclusion algorithm it also enforces mutual exclusion. That is, m and n cannot both be 3 simultaneously: invariant ,(m = 3 1\ n = 3) This fact cannot be proved directly from the program text; we prove invariants (11) and (12), given below, from which this fact can be deduced.

Also, we would like to show that as long as cO remains false the state is unchanged. These claims are obviously true for the first box, Odometer1; but they are not so obvious for Odometer2 because, with the decoupling of the actions, it seems plausible that (3 may be executed before a when cO becomes true, for instance. For Odometer2, we claim the following invariant. The proof of this invariant is left to the reader. ,c2 holds as well; hence, no action execution has any effect. ) Therefore, as long as cO remains false, the odometer is unchanged.

The labels are optional for actions; they have no effect on program execution. The convention for parameter-passing is call by value-result. First, the arguments ofthe procedure call are stored into the parameters; the parameters are treated as local variables of the called procedure. Upon termination of the execution of the called procedure the parameter values are assigned to the arguments. 2 Seuss Syntax 43 Example (continued) We add the procedure names to the previous skeletal program. program MutualExclusion cat Semaphore nat n = 1 {initially, the semaphore value is I}; partial method P:: {Body of P goes here} total method V:: {Body of V goes here} end {Semaphore} box s, t : Semaphore cat user boolean hs, ht = false , false; partial action s.

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