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' }"
Metaclass subclass:#AutoloadMetaclass
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Kernel-Classes'
!
!AutoloadMetaclass 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
"
AutoloadMetaclass catches unhandled class methods, files in
the corresponding code when first used and resends the catched
message to the now existing class.
Autoload installs AutoloadMetaclass as its metaclass in #initialize.
See details of the why and how of autoloading in the Autoload class.
[author:]
Stefan Vogel
[see also:]
Autoload
"
! !
!AutoloadMetaclass methodsFor:'message catching'!
doesNotUnderstand:aMessage
"caught a message; load the class and retry the message"
|newClass|
(myClass isNil or:[myClass == Autoload]) ifTrue:[
"take care: subclassing Autoload must still be possible"
^ self perform:aMessage selector inClass:Metaclass withArguments:aMessage arguments.
].
newClass := myClass autoload.
(newClass notNil and:[newClass isLoaded]) ifTrue:[
^ aMessage sendTo:newClass class
].
Transcript showCR:'Autoload [warning]: failed to autoload ',self name.
^ super doesNotUnderstand:aMessage
"
Wrapper unload.
Wrapper class xxx
Wrapper unload.
Wrapper
subclass:#TTTT
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'AAAA-Test'
"
"Modified: / 3.8.1999 / 13:57:05 / stefan"
!
new
"catch - load the class and send it to the real one"
^ self doesNotUnderstand:(Message selector:#new)
!
newClassBuilder
"catch - load the class and send it to the real one"
^ self doesNotUnderstand:(Message selector:#newClassBuilder)
! !
!AutoloadMetaclass class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/AutoloadMetaclass.st,v 1.9 2014-11-26 09:10:20 cg Exp $'
!
version_CVS
^ '$Header: /cvs/stx/stx/libbasic/AutoloadMetaclass.st,v 1.9 2014-11-26 09:10:20 cg Exp $'
! !