a5dbd0f5d9
Used http://wcp.sdf-eu.org/software/sclf-20150207T213551.tbz (sha256 a231aeecdb9e87c72642292a1e083fffb33e69ec1d34e667326c6c35b8bcc794). There's no upstream repository nor a release since 2015, so importing seems to make a lot of sense. Since we can't subtree making any depot-related changes in a separate CL to make them more discoverable -- this is only the source import. Change-Id: Ia51a7f4029dba3abd1eee4eeebcf99aca5c5ba4c Reviewed-on: https://cl.tvl.fyi/c/depot/+/3376 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
115 lines
4 KiB
Common Lisp
115 lines
4 KiB
Common Lisp
;;;
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;;; Code freely lifted from various places with compatible license
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;;; terms. Most of this code is copyright Gilbert Baumann
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;;; <unk6@rz.uni-karlsruhe.de>. The bugs are copyright Walter
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;;; C. Pelissero <walter@pelissero.de>.
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;;;
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;;; This library is free software; you can redistribute it and/or
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;;; modify it under the terms of the GNU Library General Public
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;;; License as published by the Free Software Foundation; either
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;;; version 2 of the License, or (at your option) any later version.
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;;;
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;;; This library is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; Library General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU Library General Public
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;;; License along with this library; if not, write to the
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;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;;; Boston, MA 02111-1307 USA.
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(in-package :sclf)
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(defun make-lock (&optional name)
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(mp:make-lock name))
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(defun make-recursive-lock (&optional name)
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(mp:make-lock name :kind :recursive))
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(defmacro with-lock-held ((lock &key whostate (wait t) timeout) &body forms)
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`(mp:with-lock-held (,lock ,(or whostate "Lock Wait")
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:wait wait
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,@(when timeout (list :timeout timeout)))
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,@forms))
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(defmacro with-recursive-lock-held ((lock &key wait timeout) &body forms)
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`(mp:with-lock-held (,lock
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,@(when wait (list :wait wait))
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,@(when timeout (list :timeout timeout)))
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,@forms))
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(defstruct condition-variable
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(lock (make-lock "condition variable"))
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(value nil)
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(process-queue nil))
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(defun %release-lock (lock) ; copied from with-lock-held in multiproc.lisp
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#+i486 (kernel:%instance-set-conditional
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lock 2 mp:*current-process* nil)
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#-i486 (when (eq (lock-process lock) mp:*current-process*)
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(setf (lock-process lock) nil)))
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(defun condition-wait (cv lock &optional timeout)
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(declare (ignore timeout)) ;For now
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(loop
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(let ((cv-lock (condition-variable-lock cv)))
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(with-lock-held (cv-lock)
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(when (condition-variable-value cv)
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(setf (condition-variable-value cv) nil)
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(return-from condition-wait t))
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(setf (condition-variable-process-queue cv)
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(nconc (condition-variable-process-queue cv)
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(list mp:*current-process*)))
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(%release-lock lock))
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(mp:process-add-arrest-reason mp:*current-process* cv)
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(let ((cv-val nil))
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(with-lock-held (cv-lock)
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(setq cv-val (condition-variable-value cv))
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(when cv-val
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(setf (condition-variable-value cv) nil)))
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(when cv-val
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(mp::lock-wait lock "waiting for condition variable lock")
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(return-from condition-wait t))))))
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(defun condition-notify (cv)
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(with-lock-held ((condition-variable-lock cv))
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(let ((proc (pop (condition-variable-process-queue cv))))
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;; The waiting process may have released the CV lock but not
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;; suspended itself yet
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(when proc
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(loop
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for activep = (mp:process-active-p proc)
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while activep
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do (mp:process-yield))
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(setf (condition-variable-value cv) t)
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(mp:process-revoke-arrest-reason proc cv))))
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;; Give the other process a chance
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(mp:process-yield))
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(defun process-execute (process function)
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(mp:process-preset process function)
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;; For some obscure reason process-preset doesn't make the process
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;; runnable. I'm sure it's me who didn't understand how
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;; multiprocessing works under CMUCL, despite the vast documentation
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;; available.
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(mp:enable-process process)
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(mp:process-add-run-reason process :enable))
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(defun destroy-process (process)
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;; silnetly ignore a process that is trying to destroy itself
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(unless (eq (mp:current-process)
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process)
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(mp:destroy-process process)))
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(defun restart-process (process)
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(mp:restart-process process)
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(mp:enable-process process)
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(mp:process-add-run-reason process :enable))
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(defun process-alive-p (process)
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(mp:process-alive-p process))
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(defun process-join (process)
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(error "PROCESS-JOIN not support under CMUCL."))
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