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标准库头文件 <hazard_pointer> (C++26)

来自 cppreference.com
< cpp‎ | header
 
 
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<condition_variable> (C++11)  
<semaphore> (C++20)
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<barrier> (C++20)
<future> (C++11)
<hazard_pointer> (C++26)

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<cstdalign> (C++11/17/20*)

<ciso646> (直到 C++20)

 

此头文件是 线程支持 库的一部分。

内容

允许对象受到危险保护
(类模板) [编辑]
单写多读指针,在任何时间点最多只能由一个线程拥有
(类) [编辑]

函数

构造一个危险指针
(函数) [编辑]
专门用于 std::swap 算法
(函数模板) [编辑]

[编辑] 概要

namespace std {
  // hazard_pointer_obj_base
  template<class T, class D = default_delete<T>> class hazard_pointer_obj_base;
 
  // hazard_pointer
  class hazard_pointer;
 
  // make_hazard_pointer
  hazard_pointer make_hazard_pointer();
  void swap(hazard_pointer&, hazard_pointer&) noexcept;
}

[编辑] 类模板 std::hazard_pointer_obj_base

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

[编辑] std::hazard_pointer

namespace std {
  class hazard_pointer {
  public:
    hazard_pointer() noexcept;
    hazard_pointer(hazard_pointer&&) noexcept;
    hazard_pointer& operator=(hazard_pointer&&) noexcept;
    ~hazard_pointer();
 
    bool empty() const noexcept;
    template<class T> T* protect(const atomic<T*>& src) noexcept;
    template<class T> bool try_protect(T*& ptr, const atomic<T*>& src) noexcept;
    template<class T> void reset_protection(const T* ptr) noexcept;
    void reset_protection(nullptr_t = nullptr) noexcept;
    void swap(hazard_pointer&) noexcept;
  };
}