std::shared_timed_mutex::try_lock_shared_until

 

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std::shared_timed_mutex

Member functions

shared_timed_mutex::shared_timed_mutex

shared_timed_mutex::~shared_timed_mutex

Exclusive locking

shared_timed_mutex::lock

shared_timed_mutex::try_lock

shared_timed_mutex::try_lock_for

shared_timed_mutex::try_lock_until

shared_timed_mutex::unlock

Shared locking

shared_timed_mutex::lock_shared

shared_timed_mutex::try_lock_shared

shared_timed_mutex::try_lock_shared_for

shared_timed_mutex::try_lock_shared_until

shared_timed_mutex::unlock_shared

 

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

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).

See also

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