ProceedError.st
author Jan Vrany <jan.vrany@labware.com>
Thu, 25 Mar 2021 20:30:03 +0000
branchjv
changeset 25411 248600ba8fd9
parent 21024 8734987eb5c7
permissions -rw-r--r--
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.
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"
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 COPYRIGHT (c) 1999 by eXept Software AG
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              All Rights Reserved
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 This software is furnished under a license and may be used
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 only in accordance with the terms of that license and with the
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 inclusion of the above copyright notice.   This software may not
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 be provided or otherwise made available to, or used by, any
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 other person.  No title to or ownership of the software is
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 hereby transferred.
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"
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"{ Package: 'stx:libbasic' }"
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"{ NameSpace: Smalltalk }"
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Warning subclass:#ProceedError
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    instanceVariableNames: ''
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    classVariableNames: ''
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    poolDictionaries: ''
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    category: 'Kernel-Exceptions-Errors'
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!
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!ProceedError class methodsFor:'documentation'!
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copyright
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"
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 COPYRIGHT (c) 1999 by eXept Software AG
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              All Rights Reserved
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 This software is furnished under a license and may be used
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 only in accordance with the terms of that license and with the
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 inclusion of the above copyright notice.   This software may not
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 be provided or otherwise made available to, or used by, any
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 other person.  No title to or ownership of the software is
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 hereby transferred.
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"
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!
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documentation
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"
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    ProceedError is raised to indicate that a handler tried to
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    proceed an exception marked as nonproceedable.
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    The parameter is the exception which tried to proceed.
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    NOTE: In the past ST/X didn't distinguish between proceedable
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          and non-proceedable exceptions. To make transistion easier,
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          this exception is a warning for now. In a future release of
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          ST/X, this exception will be changed to be an error 
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          (child of SignalError).
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          Please fix your code.
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! !
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!ProceedError class methodsFor:'initialization'!
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initialize
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    NotifierString := 'handler tried to proceed from nonproceedable exception'.
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    "
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     self initialize
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    "
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! !
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!ProceedError methodsFor:'default actions'!
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defaultAction
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    "make proceeding from a non-proceedable raise a warning for now.
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     This will change in future revisions"
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    ('WARNING: signal <', parameter creator printString, '> has been raised nonproceedable') errorPrintCR.
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    ('         by: ', parameter suspendedContext printString) errorPrintCR.
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    ('           : ', parameter suspendedContext sender printString) errorPrintCR.
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    ('           : ', parameter suspendedContext sender sender printString) errorPrintCR.
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    ('         ', suspendedContext printString , ' tries to proceed.') errorPrintCR.
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    ('         in: ', thisContext sender printString) errorPrintCR.
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    ('           : ', thisContext sender sender printString) errorPrintCR.
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    ('           : ', thisContext sender sender sender printString) errorPrintCR.
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    ('         This may be an error in future ST/X versions.') errorPrintCR.
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    self proceedWith:nil.
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    "
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      Object errorSignal handle:[:ex|
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         ex proceedWith:nil
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      ] do:[
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         Object errorSignal raise
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      ].
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      Object errorSignal handle:[:ex|
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         ex proceed
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      ] do:[
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         Object errorSignal raise
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      ].
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   "
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    "Modified: / 13-11-2016 / 10:52:37 / cg"
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! !
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!ProceedError class methodsFor:'documentation'!
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version
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    ^ '$Header$'
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!
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version_SVN
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    ^ '$Id: ProceedError.st 10761 2012-01-19 11:46:00Z vranyj1 $'
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! !
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ProceedError initialize!