32 Concurrency support library [thread]

32.6 Mutual exclusion [thread.mutex]

32.6.5 Locks [thread.lock]

32.6.5.5 Class template shared_lock [thread.lock.shared]

32.6.5.5.3 Locking [thread.lock.shared.locking]

void lock();

Error conditions:

(4.1)
operation_not_permitted — if pm is nullptr.
(4.2)
resource_deadlock_would_occur — if on entry owns is true.

bool try_lock();

Postconditions: owns == res, where res is the value returned by the call to pm->try_lock_shared().

Error conditions:

(9.1)
operation_not_permitted — if pm is nullptr.
(9.2)
resource_deadlock_would_occur — if on entry owns is true.

template<class Clock, class Duration>
  bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);

Preconditions: Mutex meets the Cpp17SharedTimedLockable requirements ([thread.req.lockable.shared.timed]).

Postconditions: owns == res, where res is the value returned by the call to pm->try_lock_shared_until(abs_time).

Returns: The value returned by the call to pm->try_lock_shared_until(abs_time).

Error conditions:

(15.1)
operation_not_permitted — if pm is nullptr.
(15.2)
resource_deadlock_would_occur — if on entry owns is true.

template<class Rep, class Period>
  bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);

Preconditions: Mutex meets the Cpp17SharedTimedLockable requirements ([thread.req.lockable.shared.timed]).

Throws: Any exception thrown by pm->try_lock_shared_for(rel_time).

system_error when an exception is required ([thread.req.exception]).

Error conditions:

(21.1)
operation_not_permitted — if pm is nullptr.
(21.2)
resource_deadlock_would_occur — if on entry owns is true.

void unlock();

Error conditions:

(25.1)
operation_not_permitted — if on entry owns is false.

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