To implement this signaling protocol, each LP must be able to determine whether it is engaged or disengaged, and if it is engaged, whether or not it is a leaf node of the tree. Two variables are defined for this purpose:• C is defined as the number of messages received from neighbors that have not yet been signaled.• D is defined as the number of messages sent to other processors from which a signal has yet to be returned (the number of descendants in the tree).
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