30 Thread support library [thread]

30.4.1.4.1 Class shared_mutex [thread.sharedmutex.class]

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]
  };
}