In fact, this is already uses to denote a 'changing value' when discussion the frame problem, in particular in the event calculus. In the earlier papers, Paul Tarau uses 'Fluents' - but that name is not well chosen. 'The idea was pinned by Paul Tarau' -> 'The idea was penned/developed by Paul Tarau' Fluents vs Interactors So the engine is put on hold as the thread returns to animating the caller. 'After the engine yields or completes, it is detached from the operating system thread and the answer term is made available to the calling thread.' 'Asking an engine for the next answer attaches the engine to the calling operating system thread'ĭoes that mean that the engine is then animated by the OS thread of the engine caller? The section on Pengines Some text fixes needed Network, engines are in-process entities. Related to Pengines as provided by library library(pengines),īut where Pengines aim primarily at accessing Prolog engines through the With a Prolog system though the terminal. Communicating with an engine is similar to communicating Operating system thread and the answer term is made available to theĬalling thread. After the engine yields or completes, it is detached from the Or its associated goal completes with an answer, failure or anĮxception. Operating system thread and cause it to run until the engine calls engine_yield/1 Instead, you askĪn engine for a next answer ( engine_next/2).Īsking an engine for the next answer attaches the engine to the calling Unlike normal Prolog threads though, theyĪre not associated with an operating system thread. An engine is a Prolog virtual machine that has its own stacksĪnd (virtual) machine state. Together with Paul Tarau and Paulo Moura.Įngines are closely related to threads ( sectionġ0).

The API described in this chapter has been established The idea was developed by Paul Tarau Tarau,Ģ011. This section discusses engines,Īlso known as interactors. DelimitedĬreating coroutines that run in the same Prolog engine by capturing and Triggered by attributed variables ( sectionĨ.1), SWI-Prolog provides two other forms of coroutines. Where the term coroutine in Prolog typically refer to hooks

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