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;;; ---------------------------------------------------------------------------
;;; Title: CLIM-2, Chapter 32.2 Multi-processing
;;; for ACL
;;; Created: 2001-05-22
;;; Author: Gilbert Baumann <unk6@rz.uni-karlsruhe.de>
;;; License: LGPL (See file COPYING for details).
;;; ---------------------------------------------------------------------------
;;; (c) copyright 2001 by Gilbert Baumann
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Library General Public
;;; License as published by the Free Software Foundation; either
;;; version 2 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
;;; Library General Public License for more details.
;;;
;;; You should have received a copy of the GNU Library General Public
;;; License along with this library; if not, write to the
;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;;; Boston, MA 02111-1307 USA.
(in-package :clim-internals)
(defconstant *multiprocessing-p* t)
(eval-when (:load-toplevel :compile-toplevel :execute)
(pushnew :clim-mp *features*))
(defun make-process (function &key name)
(mp:process-run-function name function))
(defun destroy-process (process)
(mp:process-kill process))
(defun current-process ()
sys:*current-process*)
(defun all-processes ()
sys:*all-processes*)
(defun processp (object)
(typep object 'mp:process))
(defun process-name (process)
(mp:process-name process))
(defun process-state (process)
(declare (ignore process))
;; Hmm can we somehow gain useful information here?
nil)
(defun process-whostate (process)
(mp:process-whostate process))
(defun process-wait (reason predicate)
(mp:process-wait reason predicate))
(defun process-wait-with-timeout (reason timeout predicate)
(mp:process-wait-with-timeout reason timeout predicate))
(defun process-yield ()
(mp:process-allow-schedule))
(defun process-interrupt (process function)
(mp:process-interrupt process function))
(defun disable-process (process)
(mp:process-add-arrest-reason process 'suspend))
(defun enable-process (process)
(mp:process-revoke-arrest-reason process 'suspend))
(defun restart-process (process)
(mp:process-reset process) )
(defmacro without-scheduling (&body body)
`(mp:without-scheduling .,body))
;; We perhaps could make use of EXCL::ATOMICALLY, which is
;; undocumented, but seems to do what we want.
(defmacro atomic-incf (place)
`(locally (declare (optimize (safety 1) (speed 3)))
(excl::atomically (incf (the fixnum ,place)))))
(defmacro atomic-decf (place)
`(locally (declare (optimize (safety 1) (speed 3)))
(excl::atomically (decf (the fixnum ,place)))))
;;; 32.3 Locks
(defun make-lock (&optional name)
(mp:make-process-lock :name name))
(defmacro with-lock-held ((place &optional state) &body body)
`(mp:with-process-lock (,place :norecursive t
,@(if state (list :whostate state) nil))
.,body))
(defun make-recursive-lock (&optional name)
(mp:make-process-lock :name name))
(defmacro with-recursive-lock-held ((place &optional state) &body body)
`(mp:with-process-lock (,place ,@(if state (list :whostate state) nil))
.,body))
(defun make-condition-variable () (mp:make-gate nil))
;;; Lock is held on entry
(defun condition-wait (cv lock &optional timeout)
(mp:close-gate cv)
(mp:process-unlock lock)
(unwind-protect
(if timeout
(mp:process-wait-with-timeout "Waiting on condition variable"
timeout
#'mp:gate-open-p
cv)
(progn
(mp:process-wait "Waiting on condition variable"
#'mp:gate-open-p
cv)
t))
(mp:process-lock lock)))
(defun condition-notify (cv)
(mp:open-gate cv))
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