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gnusmalltalk
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processorscheduler.st
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1992-02-15
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2KB
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104 lines
"======================================================================
|
| ProcessorScheduler Method Definitions
|
======================================================================"
"======================================================================
|
| Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.
| Written by Steve Byrne.
|
| This file is part of GNU Smalltalk.
|
| GNU Smalltalk 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 1, or (at your option) any later version.
|
| GNU Smalltalk 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.
|
| You should have received a copy of the GNU General Public License along with
| GNU Smalltalk; see the file COPYING. If not, write to the Free Software
| Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
======================================================================"
"
| Change Log
| ============================================================================
| Author Date Change
| sbb 16 Mar 91 Class creation now separate statement.
|
| sbyrne 25 Apr 89 created.
|
"
Object subclass: #ProcessorScheduler
instanceVariableNames: 'processLists activeProcess'
classVariableNames: ''
poolDictionaries: ''
category: nil
!
ProcessorScheduler comment:
'I provide methods that control the execution of processes.' !
!ProcessorScheduler methodsFor: 'basic'!
activeProcess
^activeProcess
!
terminateActive
activeProcess terminate
"Poor man's terminate"
" [true] whileTrue: [ Processor yield ]"
!
yield
| process priority processList |
priority _ activeProcess priority.
processList _ processLists at: priority.
processList isEmpty
ifFalse: [ processList addLast: activeProcess.
activeProcess suspend ]
!
activePriority
^self activeProcess priority
!
timingPriority
8
!
highIOPriority
7
!
lowIOPriority
6
!
userInterruptPriority
5
!
userSchedulingPriority
4
!
userBackgroundPriority
3
!
systemBackgroundPriority
2
!!