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]

33.4.4.4.2 shared_­lock locking [thread.lock.shared.locking]

void lock();

1
#

Effects: As if by pm->lock_­shared().

2
#

Postconditions: owns == true.

3
#

Throws: Any exception thrown by pm->lock_­shared(). system_­error when an exception is required ([thread.req.exception]).

4
#

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();

5
#

Effects: As if by pm->try_­lock_­shared().

6
#

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

7
#

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

8
#

Throws: Any exception thrown by pm->try_­lock_­shared(). system_­error when an exception is required ([thread.req.exception]).

9
#

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);

10
#

Effects: As if by pm->try_­lock_­shared_­until(abs_­time).

11
#

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

12
#

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

13
#

Throws: Any exception thrown by pm->try_­lock_­shared_­until(abs_­time). system_­error when an exception is required ([thread.req.exception]).

14
#

Error conditions:

  • (14.1)

    operation_­not_­permitted — if pm is nullptr.

  • (14.2)

    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);

15
#

Effects: As if by pm->try_­lock_­shared_­for(rel_­time).

16
#

Returns: The value returned by the call to pm->try_­lock_­shared_­for(rel_­time).

17
#

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

18
#

Throws: Any exception thrown by pm->try_­lock_­shared_­for(rel_­time). system_­error when an exception is required ([thread.req.exception]).

19
#

Error conditions:

  • (19.1)

    operation_­not_­permitted — if pm is nullptr.

  • (19.2)

    resource_­deadlock_­would_­occur — if on entry owns is true.

void unlock();

20
#

Effects: As if by pm->unlock_­shared().

21
#

Postconditions: owns == false.

22
#

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

23
#

Error conditions:

  • (23.1)

    operation_­not_­permitted — if on entry owns is false.