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"
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COPYRIGHT (c) 2004 by eXept Software AG
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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"{ Package: 'stx:libbasic' }"
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Object subclass:#Continuation
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instanceVariableNames:'process id suspendContext'
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classVariableNames:''
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poolDictionaries:''
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category:'Kernel-Processes'
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!
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!Continuation class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2004 by eXept Software AG
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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documentation
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"
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Initial attempt - Contnuations do not work yet.
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[Instance variables:]
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id <SmallInteger> a unique continuation-id;
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Used to identify a corresponding
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data-structure in the VM.
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process <Process> the process which created this continuation.
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[Class variables:]
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[see also:]
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Process Context Block
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[author:]
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Claus Gittinger
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"
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8582
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!
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supported
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^ false
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! !
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!Continuation class methodsFor:'instance creation'!
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current
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^ self new
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"/ ^ self fromContext: thisContext sender
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!
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currentDo: aBlock
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^ aBlock value:self new
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"/ ^ aBlock value: (self fromContext: thisContext sender)
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!
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fromContext: aStack
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aStack == thisContext sender ifFalse:[
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self error.
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].
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^ self new
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"/ ^ self new initializeFromContext: aStack
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8582
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!
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new
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|cont id|
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cont := super new.
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%{
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int __cId;
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extern int __continuationCreate();
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__cId = __continuationCreate(cont);
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if (__cId) {
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id = __MKSMALLINT(__cId);
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}
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%}.
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id isNil ifTrue:[
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self error:'could not create continuation' mayProceed:true.
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^ nil.
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].
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cont setId:id process:(Processor activeProcess).
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^ cont
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"
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self new
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"
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! !
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!Continuation methodsFor:'as yet unclassified'!
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restoreValues
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self halt.
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"/ | valueStream context |
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"/
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"/ valueStream _ values readStream.
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"/ [valueStream atEnd] whileFalse:
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"/ [context _ valueStream next.
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"/ 1 to: context class instSize do: [:i | context instVarAt: i put: valueStream next].
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"/ 1 to: context localSize do: [:i | context localAt: i put: valueStream next]]
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! !
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!Continuation methodsFor:'invocation'!
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numArgs
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^ 1
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!
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value
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self value: nil
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!
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value: v
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|cID|
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(cID := id) notNil ifTrue:[
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%{
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__continuationResume(__intVal(cID));
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%}
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].
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self halt.
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"/ self terminate: thisContext.
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"/ self restoreValues.
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"/ thisContext swapSender: values first.
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"/ ^v
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!
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valueWithArguments: v
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v size == 1 ifFalse: [^self error: 'continuations can only be resumed with one argument'].
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self value: v first
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! !
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!Continuation methodsFor:'private'!
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initializeFromContext: aContext
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self halt.
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"/ | valueStream context |
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"/
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"/ valueStream _ WriteStream on: (Array new: 20).
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"/ context _ aContext.
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"/ [context notNil] whileTrue:
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"/ [valueStream nextPut: context.
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"/ 1 to: context class instSize do: [:i | valueStream nextPut: (context instVarAt: i)].
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"/ 1 to: context localSize do: [:i | valueStream nextPut: (context localAt: i)].
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"/ context _ context sender].
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"/ values _ valueStream contents
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!
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terminate: aContext
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self halt.
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"/ | context |
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"/ context _ aContext.
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"/ [context notNil] whileTrue: [context _ context swapSender: nil]
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! !
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!Continuation methodsFor:'private accessing'!
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finalize
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|cId|
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(cId := id) notNil ifTrue:[
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id := nil.
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%{
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__continuationDestroy(__intVal(cId));
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%}
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].
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!
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setId:idArg process:aProcess
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id := idArg.
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process := aProcess.
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self registerForFinalization.
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! !
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!Continuation class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libbasic/Continuation.st,v 1.7 2004-09-27 10:16:12 ca Exp $'
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! !
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