标准库标头 <thread>

#include <compare>
 
namespace std {
  // 类 thread
  class thread;
 
  void swap(thread& x, thread& y) noexcept;
 
  // 类 jthread
  class jthread;
 
  // 命名空间 this_thread
  namespace this_thread {
    thread::id get_id() noexcept;
 
    void yield() noexcept;
    template<class Clock, class Duration>
    void sleep_until(const chrono::time_point<Clock, Duration>& abs_time);
    template<class Rep, class Period>
    void sleep_for(const chrono::duration<Rep, Period>& rel_time);
  }
}

namespace std {
  class thread
  {
  public:
    // 类 thread::id
    class id;
    using native_handle_type = /* 由实现定义 */;
 
    // 构造/复制/销毁
    thread() noexcept;
    template<class F, class... Args>
    explicit thread(F&& f, Args&&... args);
    ~thread();
    thread(const thread&) = delete;
    thread(thread&&) noexcept;
    thread& operator=(const thread&) = delete;
    thread& operator=(thread&&) noexcept;
 
    // 成员
    void swap(thread&) noexcept;
    bool joinable() const noexcept;
    void join();
    void detach();
    id get_id() const noexcept;
    native_handle_type native_handle();
 
    // 静态成员
    static unsigned int hardware_concurrency() noexcept;
  };
}

namespace std {
  class jthread
  {
  public:
    // 类型
    using id                 = thread::id;
    using native_handle_type = thread::native_handle_type;
 
    // 构造函数、移动与赋值
    jthread() noexcept;
    template<class F, class... Args>
    explicit jthread(F&& f, Args&&... args);
    ~jthread();
    jthread(const jthread&) = delete;
    jthread(jthread&&) noexcept;
    jthread& operator=(const jthread&) = delete;
    jthread& operator=(jthread&&) noexcept;
 
    // 成员
    void swap(jthread&) noexcept;
    bool joinable() const noexcept;
    void join();
    void detach();
    id get_id() const noexcept;
    native_handle_type native_handle();
 
    // 停止记号处理
    stop_source get_stop_source() noexcept;
    stop_token get_stop_token() const noexcept;
    bool request_stop() noexcept;
 
    // 特化的算法
    friend void swap(jthread& lhs, jthread& rhs) noexcept;
 
    // 静态成员
    static unsigned int hardware_concurrency() noexcept;
 
  private:
    stop_source ssource; // 仅用于阐释
  };
}

namespace std {
  class thread::id
  {
  public:
    id() noexcept;
  };
 
  bool operator==(thread::id x, thread::id y) noexcept;
  strong_ordering operator<=>(thread::id x, thread::id y) noexcept;
 
  template<class CharT, class Traits>
  basic_ostream<CharT, Traits>& operator<<(basic_ostream<CharT, Traits>& out,
                                           thread::id id);
 
  template<class CharT>
  struct formatter<thread::id, CharT>;
 
  // 散列支持
  template<class T>
  struct hash;
  template<>
  struct hash<thread::id>;
}