A Discipline of Multiprogramming: Programming Theory for by Jayadev Misra

By Jayadev Misra

During this ebook, a programming version is constructed that addresses the basic problems with 'large-scale programming'. The procedure unifies a number of suggestions from database thought, object-oriented programming and designs of reactive platforms. The version and the linked conception has been christened "Seuss." the main target of Seuss is to simplify multiprogramming. To this finish, the worry of concurrent implementation is separated from the center application layout challenge. A software execution is known as a unmarried thread of keep watch over - sequential executions of activities which are selected in accordance with a few scheduling coverage. to that end, it really is attainable to cause concerning the houses of a software from its unmarried execution thread.

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

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Each value from J, g, and h appears eventually in out. The first two properties can be stated as invariants of Merge and the last one is a progress property. 5 Mutual exclusion Mutual exclusion is a classic problem in concurrent computing. We treat the problem here not because of its intrinsic difficulty or its central place in concurrent computing but as an illustration of refinement in action systems. Two or more processes each have a section of code called the critical section, and it is required that at most one process execute its critical section at any time.

An Object-Oriented View of Action Systems There is a fundamental issue related to method calls. , for an unbounded number of computation steps); if there is no guarantee that the method can be executed successfully to completion, the call should be rejected. This is in contrast to current practices in concurrent computing where a process that requests a resource is made to wait, perhaps forever, if the resource is not available. Guaranteed termination of a method call is an essential requirement of our theory; we insist that execution of every action terminate, and this requirement can be met only if every method called by an action is also guaranteed to terminate.

4 Examples 23 FP = {from the definition of FP} ((m>n) => (m,n=m-n , n)) 1\ ((n>m) => (m,n=m,n-m)) {Simplify } ((m > n) => (n = 0)) 1\ ((n > m) => (m = 0)) Any fixed point reached by the box satisfies the invariant and this FP; hence, at a reachable fixed point P 1\ ((m > n) => (n = 0)) 1\ ((n> m) => (m = 0)) => {P => n > O. And m > n => n = O. So m ~ n . => => Similarly, n ~ m} m ~ n 1\ n ~ m 1\ gcd(m, n) = gcd(M, N) {arithmetic} m = n 1\ gcd(m, n) = gcd(M, N) {gcd(x,x) = x, for any positive integer x} m = gcd(M,N) The remaining proof obligation is that every execution of GCD eventually reaches a fixed point.

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