33 Concurrency support library [thread]

33.6 Mutual exclusion [thread.mutex]

33.6.5 Locks [thread.lock]

33.6.5.5 Class template shared_lock [thread.lock.shared]

33.6.5.5.3 Locking [thread.lock.shared.locking]

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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.
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bool try_lock();
5
#
Effects: As if by pm->try_lock_shared().
6
#
Postconditions: owns == res, where res is the value returned by the call to pm->try_lock_shared().
7
#
Returns: 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.
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template<class Clock, class Duration> bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
10
#
Preconditions: Mutex meets the Cpp17SharedTimedLockable requirements ([thread.req.lockable.shared.timed]).
11
#
Effects: As if by 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
#
Returns: The value returned by the call to pm->try_lock_shared_until(abs_time).
14
#
Throws: Any exception thrown by pm->try_lock_shared_until(abs_time).
system_error when an exception is required ([thread.req.exception]).
15
#
Error conditions:
  • (15.1)
    operation_not_permitted — if pm is nullptr.
  • (15.2)
    resource_deadlock_would_occur — if on entry owns is true.
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template<class Rep, class Period> bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
16
#
Preconditions: Mutex meets the Cpp17SharedTimedLockable requirements ([thread.req.lockable.shared.timed]).
17
#
Effects: As if by pm->try_lock_shared_for(rel_time).
18
#
Postconditions: owns == res, where res is the value returned by the call to pm->try_lock_shared_for(rel_time).
19
#
Returns: The value returned by the call to pm->try_lock_shared_for(rel_time).
20
#
Throws: Any exception thrown by pm->try_lock_shared_for(rel_time).
system_error when an exception is required ([thread.req.exception]).
21
#
Error conditions:
  • (21.1)
    operation_not_permitted — if pm is nullptr.
  • (21.2)
    resource_deadlock_would_occur — if on entry owns is true.
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void unlock();
22
#
Effects: As if by pm->unlock_shared().
23
#
Postconditions: owns == false.
24
#
Throws: system_error when an exception is required ([thread.req.exception]).
25
#
Error conditions:
  • (25.1)
    operation_not_permitted — if on entry owns is false.