starts in the raised state and cannot be re-raised once it is in the lowered state. The term "count-down latch" is sometimes used to refer to a latch that is automatically lowered once a predetermined number of threads/processes have arrived.

Implementation

Consider the following example of a thread barrier. The thread barrier requires a variable to "keep track of the total number of threads that have entered the barrier. Whenever sufficient threads enter the barrier, it will be lifted. A synchronization primitive

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