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Standard library header <semaphore> (C++20)

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< cpp‎ | header
 
 
Standard library headers
 

This header is part of the thread support library.

Classes

semaphore that models a non-negative resource count
(class template) [edit]
semaphore that has only two states
(typedef) [edit]

[edit] Synopsis

namespace std {
 template<ptrdiff_t LeastMaxValue = /* implementation-defined */>
 class counting_semaphore;
 
 using binary_semaphore = counting_semaphore<1>;
}

[edit] Class template std::counting_semaphore

namespace std {
 template<ptrdiff_t LeastMaxValue = /* implementation-defined */>
 class counting_semaphore {
 public:
 static constexpr ptrdiff_t max() noexcept;
 
 constexpr explicit counting_semaphore(ptrdiff_t desired);
 ~counting_semaphore();
 
 counting_semaphore(const counting_semaphore&) = delete;
 counting_semaphore& operator=(const counting_semaphore&) = delete;
 
 void release(ptrdiff_t update = 1);
 void acquire();
 bool try_acquire() noexcept;
 template<class Rep, class Period>
 bool try_acquire_for(const chrono::duration<Rep, Period>& rel_time);
 template<class Clock, class Duration>
 bool try_acquire_until(const chrono::time_point<Clock, Duration>& abs_time);
 
 private:
 ptrdiff_t counter; // exposition only
 };
}
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