Книга: Distributed operating systems


All the synchronization techniques we have studied so far are essentially low level, like semaphores. They require the programmer to be intimately involved with all the details of mutual exclusion, critical region management, deadlock prevention, and crash recovery. What we would really like is a much higher-level abstraction, one that hides these technical issues and allows the programmer to concentrate on the algorithms and how the processes work together in parallel. Such an abstraction exists and is widely used in distributed systems. We will call it an atomic transaction, or simply transaction. The term atomic action is also widely used. In this section we will examine the use, design, and implementation of atomic transactions.

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