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Declares the interface required to wait for the detection of a
minimal event barrier.
Only for use along with ThreadLocalDirectory.
An acquired lock which is released on close
MessageState is the reason for returning from get().
This is an implementation of
Timer
that is backed by an actual system timer.
Factory interface to create the data container for each generation of
samples, and putting data into it.
This interface wraps access to some timer that can be used to measure elapsed time, in milliseconds.