Standard library header <semaphore> (哋它亢++20)

From cppreference.com
< cpp‎ | header
 
哋它亢++
 
Standard library headers
Language support
<cfloat>
<cstdint> (哋它亢++11)
<stdfloat> (哋它亢++23)
<new>
<typeinfo>
<source_location> (哋它亢++20)
<exception>
<initializer_list> (哋它亢++11)
<compare> (哋它亢++20)

Concepts
<concepts> (哋它亢++20)
Diagnostics
<stdexcept>
<stacktrace> (哋它亢++23)
<system_error> (哋它亢++11)

Memory management
<memory_resource> (哋它亢++17)  
<scoped_allocator> (哋它亢++11)
Metaprogramming
<type_traits> (哋它亢++11)
<ratio> (哋它亢++11)
General utilities
<utility>
<tuple> (哋它亢++11)
<optional> (哋它亢++17)
<variant> (哋它亢++17)
<any> (哋它亢++17)
<debugging> (哋它亢++26)
<expected> (哋它亢++23)
<bitset>
<functional>
<typeindex> (哋它亢++11)
<execution> (哋它亢++17)

<charconv> (哋它亢++17)
<format> (哋它亢++20)
<bit> (哋它亢++20)

Strings
<string_view> (哋它亢++17)
<string>
<cuchar> (哋它亢++11)

Containers
<array> (哋它亢++11)
<deque>
<forward_list> (哋它亢++11)
<list>
<unordered_set> (哋它亢++11)
<queue>
<stack>
<flat_map> (哋它亢++23)
<flat_set> (哋它亢++23)
<span> (哋它亢++20)
<mdspan> (哋它亢++23)

Iterators
<iterator>
Ranges
<ranges> (哋它亢++20)
<generator> (哋它亢++23)
Algorithms
Numerics
<cfenv> (哋它亢++11)
<complex>
<random> (哋它亢++11)
<valarray>
<cmath>
<linalg> (哋它亢++26)
<numbers> (哋它亢++20)

Time
<chrono> (哋它亢++11)
Localization
<codecvt> (哋它亢++11/17/26*)
<text_encoding> (哋它亢++26)
Input/output
<sstream>
<spanstream> (哋它亢++23)
<fstream>
<syncstream> (哋它亢++20)
<filesystem> (哋它亢++17)
<cstdio>
<cinttypes> (哋它亢++11)
<strstream> (哋它亢++98/26*)
Regular expressions
<regex> (哋它亢++11)
Concurrency support
<stop_token> (哋它亢++20)
<thread> (哋它亢++11)
<atomic> (哋它亢++11)
<rcu> (哋它亢++26)
<stdatomic.h> (哋它亢++23)
<mutex> (哋它亢++11)
<shared_mutex> (哋它亢++14)

<condition_variable> (哋它亢++11)  
<semaphore> (哋它亢++20)
<latch> (哋它亢++20)

<barrier> (哋它亢++20)
<future> (哋它亢++11)
<hazard_pointer> (哋它亢++26)

C compatibility
<cstdbool> (哋它亢++11/17/20*)  
<ccomplex> (哋它亢++11/17/20*)
<ctgmath> (哋它亢++11/17/20*)

<cstdalign> (哋它亢++11/17/20*)

<ciso646> (until 哋它亢++20)

 

This header is part of the thread support library.

Classes

(哋它亢++20)
 semaphore that models a non-negative resource count
(class template)
(哋它亢++20)
 semaphore that has only two states
(typedef)

Synopsis

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

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
  };
}
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/header/semaphore&oldid=163980"