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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../header/rcu.html below:

Standard library header <rcu>Â (C++26)

This header is part of the thread support library.

Classes allows an object to be protected by RCU
(class template) [edit] provides regions of RCU protection
(class) [edit] Functions returns a reference to a static-duration object of type std::rcu_domain
(function) [edit] blocks until a protection region unlocks on a RCU domain
(function) [edit] may evaluate scheduled operations on a RCU domain and blocks until all preceding evaluations are complete
(function) [edit] schedules the evaluation of a specified function on a RCU domain, potentially allocating memory, and invoking scheduled evaluations
(function template) [edit] [edit] Synopsis

namespace std {
  template<class T, class D = default_delete<T>> class rcu_obj_base;
 
  class rcu_domain;
 
  rcu_domain& rcu_default_domain() noexcept;
  void rcu_synchronize(rcu_domain& dom = rcu_default_domain()) noexcept;
  void rcu_barrier(rcu_domain& dom = rcu_default_domain()) noexcept;
  template<class T, class D = default_delete<T>>
    void rcu_retire(T* p, D d = D(), rcu_domain& dom = rcu_default_domain());
}

[edit] Class template std::rcu_obj_base

namespace std {
  template<class T, class D = default_delete<T>>
  class rcu_obj_base {
  public:
    void retire(D d = D(), rcu_domain& dom = rcu_default_domain()) noexcept;
  protected:
    rcu_obj_base() = default;
    rcu_obj_base(const rcu_obj_base&) = default;
    rcu_obj_base(rcu_obj_base&&) = default;
    rcu_obj_base& operator=(const rcu_obj_base&) = default;
    rcu_obj_base& operator=(rcu_obj_base&&) = default;
    ~rcu_obj_base() = default;
  private:
    D deleter;            // exposition only
  };
}

[edit] Class std::rcu_domain

namespace std {
  class rcu_domain {
  public:
    rcu_domain(const rcu_domain&) = delete;
    rcu_domain& operator=(const rcu_domain&) = delete;
 
    void lock() noexcept;
    bool try_lock() noexcept;
    void unlock() noexcept;
  };
}

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