experiments/tng.scm
author Tony Garnock-Jones <tonygarnockjones@gmail.com>
Wed, 16 Jan 2019 17:15:58 +0000
changeset 438 1fe179d53161
parent 0 ea4e1a00864c
permissions -rw-r--r--
Add missing primitive implementation for the plain interpreter.
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(require (lib "9.ss" "srfi")
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	 (lib "1.ss" "srfi")
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	 "queue.ss")
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(define *runq* (make-q))
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(define (schedule thunk)
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  (enq! *runq* thunk))
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(define *throw-to-mainloop* '*throw-to-mainloop-not-initialised*)
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(define (mainloop)
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  (begin
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    (call-with-current-continuation (lambda (cc) (set! *throw-to-mainloop* cc)))
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    (if (q-empty? *runq*)
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	(wait-for-events)
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	(begin
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	  ((deq! *runq*))
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	  (mainloop)))))
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(define (throw-to-mainloop)
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  (*throw-to-mainloop* #f))
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(define (wait-for-events) ;; %%%
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  (display "Waiting for events.")
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  (newline)
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  (exit))
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;; Boudol's Blue Calculus
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;;---------------------------------------------------------------------------
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;; P = A | D | (P|P) | (u)P
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;; A = u | \u.P | Pu
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;; D = u:=P | u==P
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;; E = [] | Eu | (E|P) | (P|E) | (u)E
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;; STRUCTURAL EQUIVALENCE
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;;---------------------------------------------------------------------------
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;; equivalence, containing alpha-conversion
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;; par commutative, associative
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;; (u)P | Q  ===  (u)(P | Q)  when u not free in Q
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;;   (P|Q)u  ===  (Pu | Qu)
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;;  ((u)P)v  ===  (u)(Pv)     when u <> v
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;;       Du  ===  D
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;;     u==P  ===  u:=(P | u==P)
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;; equivalence of processes implies equivalence of evaluation contexts E
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;; REDUCTION
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;;---------------------------------------------------------------------------
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;;  (\u.P)v  -->  P{v/u}      small beta reduction
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;; u | u:=P  -->  P           rho - resource fetching
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;;
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;; P-->P' => E[P]-->E[P']     context
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;;
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;; P-->P' & Q===P => Q-->P'   structural
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