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.
"{ Package: 'stx:libbasic' }"
"{ NameSpace: Smalltalk }"
Object subclass:#AbstractSourceFileReader
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Kernel-Classes-Support'
!
!AbstractSourceFileReader class methodsFor:'documentation'!
documentation
"
Abstract common superclass for source file readers
"
! !
!AbstractSourceFileReader class methodsFor:'fileIn'!
fileIn: aFilename
^self new fileIn: aFilename
"Created: / 16-08-2009 / 10:14:51 / Jan Vrany <vranyj1@fel.cvut.cz>"
!
fileInStream: aStream
^self new fileInStream: aStream
"Created: / 16-08-2009 / 10:15:05 / Jan Vrany <vranyj1@fel.cvut.cz>"
! !
!AbstractSourceFileReader class methodsFor:'queries'!
isAbstract
^ self == AbstractSourceFileReader
! !
!AbstractSourceFileReader methodsFor:'fileIn'!
fileIn:aFilename
| stream |
[stream := aFilename asFilename readStream.
self fileInStream: stream]
ensure:
[stream notNil ifTrue:[stream close]]
"Modified: / 15-08-2009 / 14:47:29 / Jan Vrany <vranyj1@fel.cvut.cz>"
"Modified: / 08-08-2010 / 14:38:35 / cg"
!
fileInStream:arg
"raise an error: must be redefined in concrete subclass(es)"
^ self subclassResponsibility
! !
!AbstractSourceFileReader class methodsFor:'documentation'!
version
^ '$Header$'
!
version_CVS
^ '$Header$'
!
version_SVN
^'$Id$'
! !