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.