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#### General <a id="thread.barrier.general">[[thread.barrier.general]]</a>
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A barrier is a thread coordination mechanism whose lifetime consists of
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a sequence of barrier phases, where each phase allows at most an
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expected number of threads to block until the expected number of threads
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arrive at the barrier.
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[*Note 1*: A barrier is useful for managing repeated tasks that are
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handled by multiple threads. — *end note*]
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