标准库标头 <shared_mutex> (C++14)

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此头文件是线程支持库的一部分。

类

(C++17)
 提供共享互斥设施
(类) [编辑]
(C++14)
 提供共享互斥设施并实现有时限锁定
(类) [编辑]
(C++14)
 实现可移动的共享互斥体所有权封装器
(类模板) [编辑]

函数

(C++14)
 特化 std::swap 算法
(函数模板) [编辑]

概要

namespace std {
  class shared_mutex;
  class shared_timed_mutex;
  template<class Mutex> class shared_lock;
  template<class Mutex>
    void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept;
}

类 std::shared_mutex

namespace std {
  class shared_mutex {
  public:
    shared_mutex();
    ~shared_mutex();

    shared_mutex(const shared_mutex&) = delete;
    shared_mutex& operator=(const shared_mutex&) = delete;

    // 排他性所有权
    void lock();                // 阻塞
    bool try_lock();
    void unlock();

    // 共享所有权
    void lock_shared();         // 阻塞
    bool try_lock_shared();
    void unlock_shared();

    using native_handle_type = /* 由实现定义 */;
    native_handle_type native_handle();
  };
}

类 std::shared_timed_mutex

namespace std {
  class shared_timed_mutex {
  public:
    shared_timed_mutex();
    ~shared_timed_mutex();

    shared_timed_mutex(const shared_timed_mutex&) = delete;
    shared_timed_mutex& operator=(const shared_timed_mutex&) = delete;

    // 排他性所有权
    void lock();                // 阻塞
    bool try_lock();
    template<class Rep, class Period>
      bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
    template<class Clock, class Duration>
      bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
    void unlock();

    // 共享所有权
    void lock_shared();         // 阻塞
    bool try_lock_shared();
    template<class Rep, class Period>
      bool try_lock_shared_for(const chrono::duration<Rep, Period>& rel_time);
    template<class Clock, class Duration>
      bool try_lock_shared_until(const chrono::time_point<Clock, Duration>& abs_time);
    void unlock_shared();
  };
}

类模板 std::shared_lock

namespace std {
  template<class Mutex>
  class shared_lock {
  public:
    using mutex_type = Mutex;

    // 构造/复制/析构
    shared_lock() noexcept;
    explicit shared_lock(mutex_type& m);        // 阻塞
    shared_lock(mutex_type& m, defer_lock_t) noexcept;
    shared_lock(mutex_type& m, try_to_lock_t);
    shared_lock(mutex_type& m, adopt_lock_t);
    template<class Clock, class Duration>
      shared_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time);
    template<class Rep, class Period>
      shared_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time);
    ~shared_lock();

    shared_lock(const shared_lock&) = delete;
    shared_lock& operator=(const shared_lock&) = delete;

    shared_lock(shared_lock&& u) noexcept;
    shared_lock& operator=(shared_lock&& u) noexcept;

    // 锁定
    void lock();                                // 阻塞
    bool try_lock();
    template<class Rep, class Period>
      bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
    template<class Clock, class Duration>
      bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
    void unlock();

    // 修改器
    void swap(shared_lock& u) noexcept;
    mutex_type* release() noexcept;

    // 观察器
    bool owns_lock() const noexcept;
    explicit operator bool () const noexcept;
    mutex_type* mutex() const noexcept;

  private:
    mutex_type* pm;                             // 仅用于阐释
    bool owns;                                  // 仅用于阐释
  };

  template<class Mutex>
    void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept;
}