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32 Concurrency support library [thread]

32.8 Semaphore [thread.sema]

32.8.2 Header <semaphore> synopsis [semaphore.syn]

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namespace std { // [thread.sema.cnt], class template counting_semaphore template<ptrdiff_t least_max_value = implementation-defined> class counting_semaphore; using binary_semaphore = counting_semaphore<1>; }