![]() ![]() Each ordinary shared variable is associated with some synchronization variable such as a lock or barrier.Distributed Computing is designed to serve as a textbook for undergraduate engineering students of Computer Science and postgraduate students of Computer Applications.Use acquire and release at the start and end of each critical section, respectively.Synchronization variables: acquire and release.Until all previous accesses to synchronization variables are performed, no read write data access operations will be allowed.Only when all previous writes are completed everywhere, access to synchronizations variable is allowed.Access to synchronization variables is sequentially consistent.Properties of the weak consistency model Use a special variable called the synchronization variable.Order in which the memory operations are seen by two processors need not be identical, but the order of writes issued by each processor must be preserved.Write operations performed by different processes may be seen by different processes in different orders.Write operations performed by a single process are seen by all other processes in the order in which they were performed just as if these write operations were performed by a single process in a pipeline.Pipelined Random Access Memory consistency.Causally related operation is the one which has influenced the other operation.Weakening of sequential consistency for better concurrency.All processors in the system observe the same ordering of reads and writes which are issued in sequence by the individual processors. ![]()
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