std::recurs..._lock_until(3) C++ Standard Libary std::recurs..._lock_until(3) NAME std::recursive_timed_mutex::try_lock_until - std::recursive_timed_mu- tex::try_lock_until Synopsis template< class Clock, class Duration > bool try_lock_until( const std::chrono::time_point<Clock, Duration>& (since C++11) timeout_time ); Tries to lock the mutex. Blocks until specified timeout_time has been reached (timeout) or the lock is acquired (owns the mutex), whichever comes first. On successful lock acquisition returns true, otherwise returns false. If timeout_time has already passed, this function behaves like try_lock(). 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(), this function is allowed to fail spuriously and re- turn false even if the mutex was not locked by any other thread at some point be- fore timeout_time. Prior unlock() operation on the same mutex synchronizes-with (as defined in std::memory_order) this operation if it returns true. A thread may call try_lock_until on a recursive mutex repeatedly. Suc- cessful calls to try_lock_until increment the ownership count: the mutex will only be released after the thread makes a matching number of calls to unlock. The maximum number of levels of ownership is unspecified. A call to try_lock_until will return false if this number is exceeded. Parameters timeout_time - maximum time point to block until Return value true if the lock was acquired successfully, otherwise false. Exceptions Any exception thrown by timeout_time (clocks, time points, and durations provided by the standard library never throw). Example This section is incomplete Reason: no example Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behav- ior LWG 2093 C++11 try_lock_until threw nothing throws timeout-related exceptions See also lock locks the mutex, blocks if the mutex is not available (public member function) try_lock tries to lock the mutex, returns if the mutex is not avail- able (public member function) tries to lock the mutex, returns if the mutex has been try_lock_for unavailable for the specified timeout duration (public member function) unlock unlocks the mutex (public member function) C documentation for mtx_timedlock Category: * Todo no example http://cppreference.com 2024.06.10 std::recurs..._lock_until(3)
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