(scm_char_set_xor): bug fix: characters should only be included if

[bpt/guile.git] / ice-9 / threads.scm

;;;; 	Copyright (C) 1996, 1998, 2001 Free Software Foundation, Inc.
;;;;
;;;; This program is free software; you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation; either version 2, or (at your option)
;;;; any later version.
;;;;
;;;; This program 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 General Public License for more details.
;;;;
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;;;; along with this software; see the file COPYING.  If not, write to
;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
;;;; Boston, MA 02111-1307 USA
;;;;
;;;; As a special exception, the Free Software Foundation gives permission
;;;; for additional uses of the text contained in its release of GUILE.
;;;;
;;;; The exception is that, if you link the GUILE library with other files
;;;; to produce an executable, this does not by itself cause the
;;;; resulting executable to be covered by the GNU General Public License.
;;;; Your use of that executable is in no way restricted on account of
;;;; linking the GUILE library code into it.
;;;;
;;;; This exception does not however invalidate any other reasons why
;;;; the executable file might be covered by the GNU General Public License.
;;;;
;;;; This exception applies only to the code released by the
;;;; Free Software Foundation under the name GUILE.  If you copy
;;;; code from other Free Software Foundation releases into a copy of
;;;; GUILE, as the General Public License permits, the exception does
;;;; not apply to the code that you add in this way.  To avoid misleading
;;;; anyone as to the status of such modified files, you must delete
;;;; this exception notice from them.
;;;;
;;;; If you write modifications of your own for GUILE, it is your choice
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;;;;
;;;; ----------------------------------------------------------------
;;;; 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
;;;; ----------------------------------------------------------------
;;;;
\f
;;; 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))

\f

(define (%thread-handler tag . args)
  (fluid-set! the-last-stack #f)
  (unmask-signals)
  (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)))))

; --- MACROS -------------------------------------------------------

(defmacro make-thread (proc . args)
  `(call-with-new-thread
    (lambda ()
      (,proc ,@args))
    %thread-handler))

(defmacro begin-thread (first . rest)
  `(call-with-new-thread
    (lambda ()
      (begin
	,first ,@rest))
    %thread-handler))

(defmacro with-mutex (m . body)
  `(dynamic-wind
       (lambda () (lock-mutex ,m))
       (lambda () (begin ,@body))
       (lambda () (unlock-mutex ,m))))

(defmacro monitor (first . rest)
  `(with-mutex ,(make-mutex)
     (begin
       ,first ,@rest)))

;; export

(export %thread-handler)

(export-syntax make-thread
               begin-thread
               with-mutex
               monitor)

;;; threads.scm ends here