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标准库头文件 <shared_mutex>

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

函数

 std::swap 对 shared_lock 的特化
(函数模板)

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

class shared_mutex {
 public:
    typedef /* 由实现定义 */ native_handle_type;
 
    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();
 
    // 获取器
    native_handle_type native_handle();
};

类 std::shared_timed_mutex

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 std::shared_lock

template <class Mutex>
class shared_lock {
 public:
    typedef Mutex mutex_type;
 
    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(shared_lock const&) = delete;
    shared_lock& operator=(shared_lock const&) = delete;
    shared_lock(shared_lock&& u) noexcept;
    shared_lock& operator=(shared_lock&& u) noexcept;
 
    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();
 
    // 设置器
    void swap(shared_lock& u) noexcept;
    mutex_type* release() noexcept;
 
    // 获取器
    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
};