NAME¶

std::shared_timed_mutex::try_lock_shared_until - std::shared_timed_mutex::try_lock_shared_until

Synopsis¶

template< class Clock, class Duration >
bool try_lock_shared_until( const (since C++14)
std::chrono::time_point<Clock,Duration>& timeout_time );

Tries to lock the mutex in shared mode. Blocks until specified timeout_time has been
reached or the lock is acquired, whichever comes first. On successful lock
acquisition returns true, otherwise returns false.

If timeout_time has already passed, this function behaves like try_lock_shared().

Clock must meet the Clock requirements.
The program is ill-formed if std::chrono::is_clock_v<Clock> is false.
(since C++20)

The standard recommends that the clock tied to timeout_time be used, in which case
adjustments of the clock may be taken into account. Thus, the duration of the block
might be more or less than timeout_time - Clock::now() at the time of the call,
depending on the direction of the adjustment and whether it is honored by the
implementation. The function also may block until after timeout_time has been
reached due to process scheduling or resource contention delays.

As with try_lock_shared(), this function is allowed to fail spuriously and return
false even if the mutex was not locked by any other thread at some point before
timeout_time.

Prior unlock() operation on the same mutex synchronizes-with (as defined in
std::memory_order) this operation if it returns true.

If try_lock_shared_until is called by a thread that already owns the mutex in any
mode (shared or exclusive), the behavior is undefined.

Parameters¶

timeout_time - maximum time point to block until

Return value¶

true if the shared lock ownership was acquired successfully, otherwise false.

Exceptions¶

Any exception thrown by clock, time_point, or duration during the execution (clocks,
time points, and durations provided by the standard library never throw).

Example¶

This section is incomplete
Reason: no example

See also¶

tries to lock the mutex, returns if the mutex has been
try_lock_until unavailable until specified time point has been reached
(public member function)
tries to lock the mutex for shared ownership, returns if the
try_lock_shared mutex is not available
(public member function)
tries to lock the mutex for shared ownership, returns if the
try_lock_shared_for mutex has been
unavailable for the specified timeout duration
(public member function)

Category:¶

* Todo no example