Fix unlikely but possible race in `WeakValueDictionary`
It may happen that value in `valueArray` could have been already
collected by the GC but #clearDeadSlots have not yet been called.
When this happened, `#at:ifAbsentPut:` returned tombstone rather
than updating the dictionary with value from block.
This commit fixes this by checking whether `valueArray` contain
the tombstone and if so, clearing up the dead slots and restarting
the operation. HTH.
"
COPYRIGHT (c) 2001 by eXept Software AG
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
"{ Package: 'stx:libbasic' }"
SequenceableCollection subclass:#ReadOnlySequenceableCollection
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Collections-Abstract'
!
!ReadOnlySequenceableCollection class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 2001 by eXept Software AG
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
documentation
"
Abstract class which blocks some write access operations.
See concrete subclasses (such as Interval).
[author:]
Claus Gittinger
[see also:]
SequenceableCollection
"
! !
!ReadOnlySequenceableCollection class methodsFor:'queries'!
isAbstract
^ self == ReadOnlySequenceableCollection
! !
!ReadOnlySequenceableCollection methodsFor:'blocked access'!
add:newObject
"{ Pragma: +optSpace }"
"catch add message - cannot add elements"
self error:('elements cannot be added to ' , self classNameWithArticle)
"
(1 to:10) add:11
(1 to:10) addAll:#(11 12)
(1 to:10) remove:9
(1 to:10) remove:9 ifAbsent:nil
(1 to:10) removeAll:#(1 4)
(1 to:10) atAllPut:1
"
!
at:index put:anObject
"{ Pragma: +optSpace }"
"catch at:put: message - cannot store elements"
self error:('you cannot store into ' , self classNameWithArticle)
"
(1 to:10) at:5 put:10
(1 to:10) atAllPut:5
(1 to:10) replaceFrom:1 to:4 with:#(10 20 30 40)
"
"Created: / 31.10.2001 / 10:05:36 / cg"
"Modified: / 31.10.2001 / 10:09:19 / cg"
!
remove:anObject ifAbsent:exceptionalValue
"{ Pragma: +optSpace }"
"catch remove message - cannot remove elements"
self error:('elements cannot be removed from ' , self classNameWithArticle)
"
(1 to:10) remove:9 ifAbsent:nil
"
! !
!ReadOnlySequenceableCollection class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/ReadOnlySequenceableCollection.st,v 1.4 2005/06/27 10:24:03 cg Exp $'
!
version_SVN
^ '$Id: ReadOnlySequenceableCollection.st 10761 2012-01-19 11:46:00Z vranyj1 $'
! !