32 Concurrency support library [thread]

32.6 Mutual exclusion [thread.mutex]

32.6.4 Mutex requirements [thread.mutex.requirements]

32.6.4.4 Shared mutex types [thread.sharedmutex.requirements]

32.6.4.4.2 Class shared_mutex [thread.sharedmutex.class]

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namespace std { class shared_mutex { public: shared_mutex(); ~shared_mutex(); shared_mutex(const shared_mutex&) = delete; shared_mutex& operator=(const shared_mutex&) = delete; // exclusive ownership void lock(); // blocking bool try_lock(); void unlock(); // shared ownership void lock_shared(); // blocking bool try_lock_shared(); void unlock_shared(); using native_handle_type = implementation-defined; // see [thread.req.native] native_handle_type native_handle(); // see [thread.req.native] }; }
1
#
The class shared_mutex provides a non-recursive mutex with shared ownership semantics.
2
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The class shared_mutex meets all of the shared mutex requirements ([thread.sharedmutex.requirements]).
It is a standard-layout class ([class.prop]).
3
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The behavior of a program is undefined if
  • (3.1)
    it destroys a shared_mutex object owned by any thread,
  • (3.2)
    a thread attempts to recursively gain any ownership of a shared_mutex, or
  • (3.3)
    a thread terminates while possessing any ownership of a shared_mutex.
4
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shared_mutex may be a synonym for shared_timed_mutex.