Algorithmique Parallèle, Cours et exercices corrigés, Arnaud Legrand, Yves Robert, Dunod, , compléments sur TD. TD1 (Sémaphores). pages de cours + 94 pages d’exercices corrigés Semaphore est une classe dédiée à l’accès à une ressource partagée non pas par un. les régions de mémoires partagées, les sémaphores et l’appel de procédure à Des exercices corrigés ac tualisés pour cette 4e édition clôturent chaque.
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The topics handled during this booklet were specifically selected to symbolize a bridge connecting the content material of a primary direction at the ordinary thought of analytic features with a rigorous remedy of a few of crucial specified services: Mailbox names are shr needed when the mailbox is physically connected to two ports.
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The operation of exrrcices is best understood by means of an example. The following mailbox system was designed for but not implemented in the SUE System [Atwood et al, ]. The SUE design uses two-way mailboxes connected via ports.
Processes have two types of ports: Each mailbox is connected to one input port and to one output port. A message sent through an output port is called a query, and a message sent through an input port is called a reply.
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These regions, called critical sections, must have the property that they be mutually exclusive. That is, at most one process can be executing a critical section with respect to a resource at one time. Many natural resources, such as tape drives and card readers, are critical. However, shared variables which can be modified by a number of processes are also critical resources.
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When the next process releases a disk with V DISKit may be important which of the waiting processes is released. For instance, one of the processes may already have three tape drives. It is clear that this process should receive the newly freed disk before a process that possesses no expensive resources. In this case, a priority-based ls rule is desirable.
The priority of the process can be determined dynamically by the number of expensive resources that the process controls. This example shows that a single scheduling rule is generally not sufficient in implementing semaphore queues.
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