Future, promise, and delay
Future, promise, and delay describe an object that acts as proxy to a result that is initially unknown due to computation of its value, which is yet to be completed. They are normally referred to as constructs used for synchronizing in some concurrent programming language.
Daniel P. Friedman and David Wise proposed the term "promise" in 1975. Peter Hibbard called it "eventual". The term promise was coined by Liskov and Shrira, although they referred to the pipelining mechanism by the name "call-stream". The term promise refers to the fact that in completion of any said operation, an eventual value will be obtained. In the same way, the value can also be taken as eventual because it will only yield out on the occurrence ...
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