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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
;;; (c) copyright 2002 by John Wiseman (jjwiseman@yahoo.com)
;;; 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)
(ccl:process-run-function name function))
(defun destroy-process (process)
(ccl:process-kill process))
(defun current-process ()
ccl:*current-process*)
(defun all-processes ()
#-openmcl-native-threads
ccl:*all-processes*
#+openmcl-native-threads
(ccl:all-processes))
(defun processp (object)
(typep object 'ccl::process))
(defun process-name (process)
(ccl:process-name process))
(defun process-state (process)
(declare (ignore process))
;; Hmm can we somehow gain useful information here?
nil)
(defun process-whostate (process)
(ccl:process-whostate process))
(defun process-wait (reason predicate)
(ccl:process-wait reason predicate))
(defun process-wait-with-timeout (reason timeout predicate)
(ccl:process-wait-with-timeout reason timeout predicate))
(defun process-yield ()
(ccl:process-allow-schedule))
(defun process-interrupt (process function)
(ccl:process-interrupt process function))
(defun disable-process (process)
#-openmcl-native-threads
(ccl:process-enable-arrest-reason process 'suspend)
#+openmcl-native-threads
(ccl:process-suspend process))
(defun enable-process (process)
#-openmcl-native-threads
(ccl:process-disable-arrest-reason process 'suspend)
#+openmcl-native-threads
(ccl:process-enable process))
(defun restart-process (process)
(ccl:process-reset process) )
(defmacro without-scheduling (&body body)
`(ccl:without-interrupts ,@body))
;; We perhaps could make use of EXCL::ATOMICALLY, which is
;; undocumented, but seems to do what we want.
;; Use EXCL::ATOMICALLY in OpenMCL?? - mikemac
#-openmcl-native-threads
(defmacro atomic-incf (place)
`(ccl:without-interrupts
(incf (the fixnum ,place))))
#-openmcl-native-threads
(defmacro atomic-decf (place)
`(ccl:without-interrupts
(decf (the fixnum ,place))))
#+openmcl-native-threads
(defmacro atomic-incf (place)
`(ccl::atomic-incf ,place))
#+openmcl-native-threads
(defmacro atomic-decf (place)
`(ccl::atomic-decf ,place))
;;; 32.3 Locks
(defun make-lock (&optional name)
(ccl:make-lock name))
(defmacro with-lock-held ((place &optional state) &body body)
#-openmcl-native-threads
`(ccl:with-lock-grabbed (,place 'ccl:*current-process*
,@(if state (list state) nil))
,@body)
#+openmcl-native-threads
`(ccl:with-lock-grabbed (,place ,@(if state (list state) nil))
,@body))
(defun make-recursive-lock (&optional name)
(ccl:make-lock name))
(defmacro with-recursive-lock-held ((place &optional state) &body body)
`(with-lock-held (,place ,@(if state (list state) nil)) ,@body))
;;; Condition variable simulation
(defun make-condition-variable () (ccl:make-semaphore))
(defun condition-wait (cv lock &optional timeout)
(let ((lock-error nil))
(unwind-protect
(progn
(handler-bind
((ccl::lock-not-owner #'(lambda (c)
(declare (ignore c))
(setq lock-error t))))
(ccl:release-lock lock))
(if timeout
(ccl:timed-wait-on-semaphore cv timeout)
(ccl:wait-on-semaphore cv))) ;XXX nil here is some kind of error
(unless lock-error ; We didn't have the lock.
(ccl:grab-lock lock)))))
(defun condition-notify (cv)
(ccl:signal-semaphore cv))
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