33 Thread support library [thread]

33.4 Mutual exclusion [thread.mutex]

33.4.4 Locks [thread.lock]

33.4.4.4 Class template shared_­lock [thread.lock.shared]

33.4.4.4.1 shared_­lock constructors, destructor, and assignment [thread.lock.shared.cons]

shared_lock() noexcept;

1
#

Effects: Constructs an object of type shared_­lock.

2
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Postconditions: pm == nullptr and owns == false.

explicit shared_lock(mutex_type& m);

3
#

Requires: The calling thread does not own the mutex for any ownership mode.

4
#

Effects: Constructs an object of type shared_­lock and calls m.lock_­shared().

5
#

Postconditions: pm == addressof(m) and owns == true.

shared_lock(mutex_type& m, defer_lock_t) noexcept;

6
#

Effects: Constructs an object of type shared_­lock.

7
#

Postconditions: pm == addressof(m) and owns == false.

shared_lock(mutex_type& m, try_to_lock_t);

8
#

Requires: The calling thread does not own the mutex for any ownership mode.

9
#

Effects: Constructs an object of type shared_­lock and calls m.try_­lock_­shared().

10
#

Postconditions: pm == addressof(m) and owns == res where res is the value returned by the call to m.try_­lock_­shared().

shared_lock(mutex_type& m, adopt_lock_t);

11
#

Requires: The calling thread has shared ownership of the mutex.

12
#

Effects: Constructs an object of type shared_­lock.

13
#

Postconditions: pm == addressof(m) and owns == true.

template <class Clock, class Duration> shared_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time);

14
#

Requires: The calling thread does not own the mutex for any ownership mode.

15
#

Effects: Constructs an object of type shared_­lock and calls m.try_­lock_­shared_­until(abs_­time).

16
#

Postconditions: pm == addressof(m) and owns == res where res is the value returned by the call to m.try_­lock_­shared_­until(abs_­time).

template <class Rep, class Period> shared_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time);

17
#

Requires: The calling thread does not own the mutex for any ownership mode.

18
#

Effects: Constructs an object of type shared_­lock and calls m.try_­lock_­shared_­for(rel_­time).

19
#

Postconditions: pm == addressof(m) and owns == res where res is the value returned by the call to m.try_­lock_­shared_­for(rel_­time).

~shared_lock();

20
#

Effects: If owns calls pm->unlock_­shared().

shared_lock(shared_lock&& sl) noexcept;

21
#

Postconditions: pm == sl_­p.pm and owns == sl_­p.owns (where sl_­p is the state of sl just prior to this construction), sl.pm == nullptr and sl.owns == false.

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

22
#

Effects: If owns calls pm->unlock_­shared().

23
#

Postconditions: pm == sl_­p.pm and owns == sl_­p.owns (where sl_­p is the state of sl just prior to this assignment), sl.pm == nullptr and sl.owns == false.