19CONCURRENCY AND PARALLELISM

The Senior Watchdog had her own watchwords: “Show me a completely smooth operation and I’ll show you someone who’s covering mistakes. Real boats rock.”—Frank Herbert, Chapterhouse: Dune

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In programming, concurrency means two or more tasks running in a given time period. Parallelism means two or more tasks running at the same instant. Often, these terms are used interchangeably without negative consequence, because they’re so closely related. This chapter introduces the very basics of both concepts. Because concurrent and parallel programming are huge and complicated topics, thorough treatment requires an entire book. ...

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