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Answer POSIX threads are fairly portable. They can be emulated on uniprocessor systems at a slight (or sometimes no) penalty in speed. On shared memory multiprocessor machines, there is often kernel support for threads; this means that your application can take full advantage of all available CPUs and achieve (near) maximum performance. It is important to point out that threads libraries are predicated on shared memory. Threads won't help you on distributed memory machines Preeti

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