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' }"
OSHandle subclass:#OSFileHandle
instanceVariableNames:''
classVariableNames:'ConcreteClass'
poolDictionaries:''
category:'System-Support'
!
!OSFileHandle 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.
"
! !
!OSFileHandle class methodsFor:'initialization'!
initialize
"initialize for the OS we are running on"
self initializeConcreteClass
"
self initialize
"
!
initializeConcreteClass
"initialize for the OS we are running on"
OperatingSystem isMSDOSlike ifTrue:[
ConcreteClass := Win32FILEHandle
] ifFalse:[
OperatingSystem isVMSlike ifTrue:[
ConcreteClass := OpenVMSFileHandle
] ifFalse:[
OperatingSystem isUNIXlike ifTrue:[
ConcreteClass := UnixFileHandle
] ifFalse:[
ConcreteClass := nil
]
]
]
"
self initializeConcreteClass
"
"Modified: 7.9.1997 / 23:32:37 / cg"
!
reinitialize
"initialize for the OS we are running on"
self initializeConcreteClass
"
self reinitialize
"
! !
!OSFileHandle methodsFor:'finalization'!
finalize
"a filedescriptor was garbage collected - close the underlying file"
"/ with timeout to avoid blocking in a bad pty/socket
[
self closeFile
] valueWithTimeout:30 seconds
! !
!OSFileHandle methodsFor:'input/output'!
readBytes:count into:aByteBuffer startingAt:startAddress
"read count bytes into a byte-buffer;
Return the number of bytes read (negative on error)"
^ self subclassResponsibility
!
writeBytes:count from:aByteBuffer startingAt:startAddress
"write count bytes from a byte-buffer;
Return the number of bytes written (negative on error)"
^ self subclassResponsibility
! !
!OSFileHandle methodsFor:'release'!
close
"close the file"
self closeFile.
self unregisterForFinalization.
!
closeFile
"close the underlying file"
self subclassResponsibility
! !
!OSFileHandle class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/OSFileHandle.st,v 1.8 2014-06-07 15:08:16 cg Exp $'
! !
OSFileHandle initialize!