分布式系统 1.1：简介

hello everybody my name is martin klepman and i'm going to be giving the next eight lectures on distributed systems this is the second half of the course on concurrent and distributed systems and so in the first half of this course you've seen a lot on concurrency that occurs within a single process so when you have especially when you have multiple threads within a single process that are performing operation concurrently you have seen how to deal with mutual exclusion for example and various algorithms for ensuring safe concurrency now in this kind of concurrent system you have all of the threads usually sharing a single address space and so you can just pass a variable from one thread to another thread and that variable can contain pointers or references to arbitrary objects and this will work because the memory addresses that one thread can access are the same as the memory addresses that another thread can access now when we move to distributed systems this changes