[thread.req.lockable.timed]

A type L meets the Cpp17TimedLockable requirements if it meets the Cpp17Lockable requirements and the following expressions are well-formed and have the specified semantics (m denotes a value of type L, rel_time denotes a value of an instantiation of duration, and abs_time denotes a value of an instantiation of time_point).

Effects: Attempts to acquire a lock for the current execution agent within the relative timeout ([thread.req.timing]) specified by rel_time.

The function will not return within the timeout specified by rel_time unless it has obtained a lock on m for the current execution agent.

If an exception is thrown then a lock has not been acquired for the current execution agent.

Returns: true if the lock was acquired, otherwise false.

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m.try_lock_until(abs_time)

Effects: Attempts to acquire a lock for the current execution agent before the absolute timeout ([thread.req.timing]) specified by abs_time.

The function will not return before the timeout specified by abs_time unless it has obtained a lock on m for the current execution agent.

If an exception is thrown then a lock has not been acquired for the current execution agent.

Returns: true if the lock was acquired, otherwise false.