Книга: Distributed operating systems


Amoeba supports two forms of communication: RPC, using point-to-point message passing, and group communication. At the lowest level, an RPC consists of a request message followed by a reply message. Group communication uses hardware broadcasting or multicasting if it is available; otherwise, the kernel transparently simulates it with individual messages. In this section we will describe both Amoeba RPC and Amoeba group communication and then discuss the underlying FLIP protocol that is used to support them.

Fig. 7-7. A process with three segments mapped into its virtual address space.

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