Chapter 13

Concurrency preliminaries

Concurrent collection algorithms have been studied for a long time, going back at least to the 1970s [Steele, 1975]. For a long time, though, they were relevant to a small minority of users. Now, multiprocessors enjoy widespread commercial availability — even the laptop on which this text is being written has a dual-core processor. Moreover, programmers need to deploy multiple cores to cooperate on the same task since that has become the only way to get a job done faster: clock speed increases can no longer deliver the regular performance boost they used to. Therefore, language implementations need to support concurrent programming, and their run-time systems, and their garbage collectors in particular, need ...

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