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) 1994 by Claus Gittinger
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' }"
ExternalStream subclass:#UnboundedExternalStream
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Streams-External'
!
!UnboundedExternalStream class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 1994 by Claus Gittinger
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
"
This class provides common protocol for all external streams which are
unbound in size (i.e. have no end). Examples of these are PipeStream,
Sockets, TTYStreams etc.
[author:]
Claus Gittinger
"
! !
!UnboundedExternalStream methodsFor:'redefind basic'!
position
"report an error that this stream has no concept of position"
self shouldNotImplement
!
position:anInteger
"report an error that this stream has no concept of position"
self shouldNotImplement
!
size
"report an error that this stream has no concept of size"
self shouldNotImplement
! !
!UnboundedExternalStream class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/UnboundedExternalStream.st,v 1.9 2015-04-21 16:06:59 cg Exp $'
! !