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 programs 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, but might not, be less or more 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 for longer than until after
timeout_time has been reached due to 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