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) 1999 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' }"
Notification subclass:#UserNotification
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Kernel-Exceptions-Notifications'
!
!UserNotification class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 1999 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
"
UserNotification is the superclass of all user notification
signals in the system. It produces an info box with the message on the screen.
If no display is available, the message is written to the Transcript (headless operation).
[author:]
Stefan Vogel
[see also:]
Signal
"
!
examples
"
[exBegin]
UserNotification raiseRequest
[exEnd]
[exBegin]
UserNotification raiseErrorString:'huh ?'
[exEnd]
[exBegin]
UserNotification raiseRequestWith:nil errorString:'what ?'
[exEnd]
[exBegin]
UserNotification raiseRequestWith:nil errorString:' what ?'
[exEnd]
"
! !
!UserNotification class methodsFor:'initialization'!
initialize
NotifierString := 'User Notification:'.
"
self initialize
"
"Created: / 23.7.1999 / 15:31:44 / stefan"
! !
!UserNotification class methodsFor:'notification'!
notify:aString
self raiseRequestErrorString:aString
!
notify:message progress:progress
^ ProgressNotification notify:message progress:progress
"Created: / 31-07-2012 / 15:18:13 / Jan Vrany <jan.vrany@fit.cvut.cz>"
! !
!UserNotification methodsFor:'default actions'!
defaultAction
"Default action for notifications: open a info box with description"
self showInformationDialog.
self proceed.
"
UserNotification raiseRequestErrorString:' abc'
"
"Modified: / 3.8.1999 / 14:06:55 / stefan"
!
showInformationDialog
"open a info box with description"
|text|
text := self description.
self hasDialog ifTrue:[
Dialog information:text.
] ifFalse:[
"
on systems without GUI, simply show
the message on the Transcript.
"
Transcript show:'notification: '; showCR:text.
].
"
UserNotification raiseRequestErrorString:' abc'
"
"Modified: / 3.8.1999 / 14:06:55 / stefan"
! !
!UserNotification class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/UserNotification.st,v 1.19 2014-05-13 22:10:03 cg Exp $'
!
version_CVS
^ '$Header: /cvs/stx/stx/libbasic/UserNotification.st,v 1.19 2014-05-13 22:10:03 cg Exp $'
! !
UserNotification initialize!