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#### General <a id="thread.latch.general">[[thread.latch.general]]</a>
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A latch is a thread coordination mechanism that allows any number of
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threads to block until an expected number of threads arrive at the latch
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(via the `count_down` function). The expected count is set when the
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latch is created. An individual latch is a single-use object; once the
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expected count has been reached, the latch cannot be reused.
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