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) 2003 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' }"
"{ NameSpace: Smalltalk }"
Error subclass:#OsError
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'OS-Support'
!
!OsError class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 2003 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.
"
! !
!OsError class methodsFor:'initialization'!
initialize
NotifierString := 'OperatingSystem error'.
! !
!OsError class methodsFor:'queries'!
mayProceed
^ true
! !
!OsError methodsFor:'accessing'!
description
"parameter is an OSErrorHolder, if present"
parameter class == OSErrorHolder ifTrue:[
^ super description , ' (', parameter description, ')'.
].
^ super description.
"
[
(OperatingSystem errorHolderForNumber:22)
parameter:'bla';
reportError.
] on:OsError do:[:ex|
ex description inspect.
].
"
!
errorCategory
"parameter is an OSErrorHolder, if present"
parameter notNil ifTrue:[
^ parameter errorCategory.
].
^ ''.
!
errorString
"parameter is an OSErrorHolder, if present"
parameter notNil ifTrue:[
^ parameter errorString.
].
^ ''.
!
errorSymbol
"parameter is an OSErrorHolder, if present"
parameter notNil ifTrue:[
^ parameter errorSymbol.
].
^ ''.
! !
!OsError class methodsFor:'documentation'!
version
^ '$Header$'
!
version_SVN
^ '$Id: OsError.st 10761 2012-01-19 11:46:00Z vranyj1 $'
! !
OsError initialize!