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' }"
UserNotification subclass:#ActivityNotification
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Kernel-Exceptions-Notifications'
!
!ActivityNotification 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.
"
!
documentation
"
ActivityNotification can be raised from deeply nested methods, which are going to perform
some long-time activity.
If there is a handler for the ActivityNotification, that one is called,
passing the argument. The handler should show this message whereever it likes,
and proceed. If there is no handler, ActivityNotification is simply ignored.
This is very useful to pass busy messages up to some higher level (typically a view)
which likes to display that message in its label or a busy-box.
It could also be put into some logfile or printed on the standard output/error.
[see also:]
Signal
"
! !
!ActivityNotification class methodsFor:'initialization'!
initialize
NotifierString := 'activity'.
"
self initialize
"
! !
!ActivityNotification methodsFor:'default actions'!
defaultAction
"the default action is to do nothing"
self proceed.
! !
!ActivityNotification class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/ActivityNotification.st,v 1.4 2008/10/04 08:42:14 cg Exp $'
!
version_SVN
^ '$Id: ActivityNotification.st 10761 2012-01-19 11:46:00Z vranyj1 $'
! !
ActivityNotification initialize!