/usr/share/guile/1.8/ice-9/threads.scm is in guile-1.8-libs 1.8.8+1-6ubuntu2.
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;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 2.1 of the License, or (at your option) any later version.
;;;;
;;;; This library is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;;;
;;;; ----------------------------------------------------------------
;;;; threads.scm -- User-level interface to Guile's thread system
;;;; 4 March 1996, Anthony Green <green@cygnus.com>
;;;; Modified 5 October 1996, MDJ <djurfeldt@nada.kth.se>
;;;; Modified 6 April 2001, ttn
;;;; ----------------------------------------------------------------
;;;;
;;; Commentary:
;; This module is documented in the Guile Reference Manual.
;; Briefly, one procedure is exported: `%thread-handler';
;; as well as four macros: `make-thread', `begin-thread',
;; `with-mutex' and `monitor'.
;;; Code:
(define-module (ice-9 threads)
:export (par-map
par-for-each
n-par-map
n-par-for-each
n-for-each-par-map
%thread-handler)
:export-syntax (begin-thread
parallel
letpar
make-thread
with-mutex
monitor))
(define ((par-mapper mapper) proc . arglists)
(mapper join-thread
(apply map
(lambda args
(begin-thread (apply proc args)))
arglists)))
(define par-map (par-mapper map))
(define par-for-each (par-mapper for-each))
(define (n-par-map n proc . arglists)
(let* ((m (make-mutex))
(threads '())
(results (make-list (length (car arglists))))
(result results))
(do ((i 0 (+ 1 i)))
((= i n)
(for-each join-thread threads)
results)
(set! threads
(cons (begin-thread
(let loop ()
(lock-mutex m)
(if (null? result)
(unlock-mutex m)
(let ((args (map car arglists))
(my-result result))
(set! arglists (map cdr arglists))
(set! result (cdr result))
(unlock-mutex m)
(set-car! my-result (apply proc args))
(loop)))))
threads)))))
(define (n-par-for-each n proc . arglists)
(let ((m (make-mutex))
(threads '()))
(do ((i 0 (+ 1 i)))
((= i n)
(for-each join-thread threads))
(set! threads
(cons (begin-thread
(let loop ()
(lock-mutex m)
(if (null? (car arglists))
(unlock-mutex m)
(let ((args (map car arglists)))
(set! arglists (map cdr arglists))
(unlock-mutex m)
(apply proc args)
(loop)))))
threads)))))
;;; The following procedure is motivated by the common and important
;;; case where a lot of work should be done, (not too much) in parallel,
;;; but the results need to be handled serially (for example when
;;; writing them to a file).
;;;
(define (n-for-each-par-map n s-proc p-proc . arglists)
"Using N parallel processes, apply S-PROC in serial order on the results
of applying P-PROC on ARGLISTS."
(let* ((m (make-mutex))
(threads '())
(no-result '(no-value))
(results (make-list (length (car arglists)) no-result))
(result results))
(do ((i 0 (+ 1 i)))
((= i n)
(for-each join-thread threads))
(set! threads
(cons (begin-thread
(let loop ()
(lock-mutex m)
(cond ((null? results)
(unlock-mutex m))
((not (eq? (car results) no-result))
(let ((arg (car results)))
;; stop others from choosing to process results
(set-car! results no-result)
(unlock-mutex m)
(s-proc arg)
(lock-mutex m)
(set! results (cdr results))
(unlock-mutex m)
(loop)))
((null? result)
(unlock-mutex m))
(else
(let ((args (map car arglists))
(my-result result))
(set! arglists (map cdr arglists))
(set! result (cdr result))
(unlock-mutex m)
(set-car! my-result (apply p-proc args))
(loop))))))
threads)))))
(define (thread-handler tag . args)
(fluid-set! the-last-stack #f)
(let ((n (length args))
(p (current-error-port)))
(display "In thread:" p)
(newline p)
(if (>= n 3)
(display-error #f
p
(car args)
(cadr args)
(caddr args)
(if (= n 4)
(cadddr args)
'()))
(begin
(display "uncaught throw to " p)
(display tag p)
(display ": " p)
(display args p)
(newline p)))
#f))
;;; Set system thread handler
(define %thread-handler thread-handler)
; --- MACROS -------------------------------------------------------
(define-macro (begin-thread . forms)
(if (null? forms)
'(begin)
`(call-with-new-thread
(lambda ()
,@forms)
%thread-handler)))
(define-macro (parallel . forms)
(cond ((null? forms) '(values))
((null? (cdr forms)) (car forms))
(else
(let ((vars (map (lambda (f)
(make-symbol "f"))
forms)))
`((lambda ,vars
(values ,@(map (lambda (v) `(join-thread ,v)) vars)))
,@(map (lambda (form) `(begin-thread ,form)) forms))))))
(define-macro (letpar bindings . body)
(cond ((or (null? bindings) (null? (cdr bindings)))
`(let ,bindings ,@body))
(else
(let ((vars (map car bindings)))
`((lambda ,vars
((lambda ,vars ,@body)
,@(map (lambda (v) `(join-thread ,v)) vars)))
,@(map (lambda (b) `(begin-thread ,(cadr b))) bindings))))))
(define-macro (make-thread proc . args)
`(call-with-new-thread
(lambda ()
(,proc ,@args))
%thread-handler))
(define-macro (with-mutex m . body)
`(dynamic-wind
(lambda () (lock-mutex ,m))
(lambda () (begin ,@body))
(lambda () (unlock-mutex ,m))))
(define-macro (monitor first . rest)
`(with-mutex ,(make-mutex)
(begin
,first ,@rest)))
;;; threads.scm ends here
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