scheme-libraries/retropikzel/parallel-srfi-18.scm

101 lines
3.9 KiB
Scheme

(define thread-proc (lambda (x) #t))
(define (new-thread name)
(let
((thread
(make-thread
(lambda ()
(letrec*
((runner
(lambda ()
(when (list? (thread-specific (current-thread)))
(for-each
(lambda (job)
(let ((lst (list-ref job 0))
(index (list-ref job 1))
(proc (list-ref job 2))
(result (list-ref job 3))
(getter (list-ref job 4))
(setter (list-ref job 5)))
(guard (condition
(else
(display "Error in thread: ")
(write (thread-name (current-thread)))
(display ", error: ")
(write condition)
(newline)
(list-set! threads
(string->number (thread-name (current-thread)))
(new-thread (thread-name (current-thread))))))
(setter result
index
(apply proc
(list (getter lst index)))))))
(thread-specific (current-thread)))
(thread-specific-set! (current-thread) #f))
(runner))))
(runner)))
name)))
(thread-specific-set! thread #f)
(thread-start! thread)
thread))
(define threads
(letrec*
((looper
(lambda (count result)
(if (>= count thread-count)
result
(looper (+ count 1)
(append result (list (new-thread (number->string count)))))))))
(looper 0 '())))
(define-syntax parallel-map
(syntax-rules ()
((_ env (l args body ...) lst)
(letrec*
((result (make-list (length lst) #f))
(lst-length (length lst))
(loop-length (- (length lst) 2))
(proc (eval `(lambda args body ...) (apply environment env)))
(job-queues (make-vector thread-count '()))
(index 0)
(waited? #f)
(waiter (lambda ()
(for-each
(lambda (thread)
(if (not (thread-specific thread))
(set! waited? #t)
(set! waited? #f)))
threads)
(if (not waited?) (waiter))))
(queu-builder
(lambda (index)
(when (< index lst-length)
(for-each
(lambda (thread)
(when (< index lst-length)
(let ((thread-index (string->number (thread-name thread))))
(vector-set! job-queues
thread-index
(append (vector-ref job-queues thread-index)
(list (list lst
index
proc
result
list-ref
list-set!)))))
(set! index (+ index 1))))
threads)
(queu-builder index)))))
(queu-builder 0)
(for-each
(lambda (thread)
(thread-specific-set!
thread
(vector-ref job-queues
(string->number (thread-name thread)))))
threads)
(waiter)
result))))