November 2010 - Pharo-dev - lists.pharo.org

Re: [Pharo-project] Array of two empty sets asSet

by Martin McClure

On 11/11/2010 06:44 AM, Janko MivÅ¡ek wrote: > Hi guys, > > What is rationale that > > (Array with: Set new with: Set new ) asSet > > returns only one set instead of two (as VW returns)? Those two new sets > are not identical, therefore asSet should return them both? They're not identical, but they are equal. It seems reasonable to consider two empty Sets equal to each other. Once you add a Set to another Set you can't add or remove anything from the inner Set anyway (because that would change the inner Set's hash, violating the invariant) so the two empty Sets might as well be the same Set, since they're effectively immutable once added to another Set. Unless you're *sure* that nothing will ever get added or removed from the inner Sets, you should use an IdentitySet for the outer set. Regards, -Martin

Nov. 11, 2010

[Pharo-project] Issue 3239 in pharo: CUIS added MessageTally default size tweaks

by pharo＠googlecode.com

Status: Fixed Owner: stephane.ducasse Labels: Milestone-1.2 Type-Squeak Difficulty-Easy New issue 3239 by stephane.ducasse: CUIS added MessageTally default size tweaks http://code.google.com/p/pharo/issues/detail?id=3239 Item was changed: ----- Method: MessageTally class>>defaultMaxClassNameSize (in category 'defaults') ----- defaultMaxClassNameSize "Return the default maximum width of the class name alone" + ^50! - ^30! Item was changed: ----- Method: MessageTally class>>defaultMaxClassPlusSelectorSize (in category 'defaults') ----- defaultMaxClassPlusSelectorSize "Return the default maximum width of the class plus selector together (not counting the '>>')" + ^100! - ^60!

Nov. 11, 2010

[Pharo-project] Issue 3238 in pharo: Use Class instead of TextDiffBuilder in changelist

by pharo＠googlecode.com

Status: Accepted Owner: stephane.ducasse Labels: Type-Squeak New issue 3238 by stephane.ducasse: Use Class instead of TextDiffBuilder in changelist http://code.google.com/p/pharo/issues/detail?id=3238 Should check how to invoke this method - use ClassDiffBuilder for diffing class definitions and comments in ChangeList =============== Diff against Tools-ul.275 =============== Item was changed: ----- Method: ChangeList>>contentsDiffedFromCurrent (in category 'viewing access') ----- contentsDiffedFromCurrent "Answer the contents diffed forward from current (in-memory) method version" | aChange aClass | listIndex = 0 ifTrue: [^ '']. aChange := changeList at: listIndex. (aChange type == #method and: [(aClass := aChange methodClass) notNil and: [aClass includesSelector: aChange methodSelector]]) ifTrue: [^Utilities methodDiffFor: aChange text class: aClass selector: aChange methodSelector prettyDiffs: self showingPrettyDiffs]. aChange type == #doIt ifTrue: [| tokens | tokens := Scanner new scanTokens: aChange string. ((tokens select: [:substr| #(subclass: variableByteSubclass: variableWordSubclass: instanceVariableNames: classVariableNames: ) includes: substr]) asSet size >= 3 and: [(aClass := Smalltalk at: tokens third ifAbsent: []) notNil and: [aClass isBehavior]]) ifTrue: + [^ClassDiffBuilder buildDisplayPatchFrom: aClass definition to: aChange string]. - [^TextDiffBuilder buildDisplayPatchFrom: aClass definition to: aChange string]. (tokens size = 4 and: [tokens second == #class and: [tokens third == #instanceVariableNames: and: [(aClass := Smalltalk at: tokens first ifAbsent: []) notNil and: [aClass isBehavior]]]]) ifTrue: + [^ClassDiffBuilder buildDisplayPatchFrom: aClass class definition to: aChange string]]. - [^TextDiffBuilder buildDisplayPatchFrom: aClass class definition to: aChange string]]. (aChange type == #classComment and: [(aClass := aChange commentClass) notNil]) ifTrue: + [^ClassDiffBuilder buildDisplayPatchFrom: aClass comment asString to: aChange string]. - [^TextDiffBuilder buildDisplayPatchFrom: aClass comment asString to: aChange string]. ^(changeList at: listIndex) text!

Nov. 11, 2010

[Pharo-project] Issue 3237 in pharo: If MessageTally is not in memory

by pharo＠googlecode.com

Status: FixedWaitingToBePharoed Owner: stephane.ducasse Labels: Type-Squeak New issue 3237 by stephane.ducasse: If MessageTally is not in memory http://code.google.com/p/pharo/issues/detail?id=3237 we have to compare because the implementation in pharo is different. in pharo we do Smalltalk globals at: #MessageTally ifPresent: [ :c | c new close ]. ----- Method: Debugger>>process:controller:context: (in category 'private') ----- process: aProcess controller: aController context: aContext super initialize. + Smalltalk at: #MessageTally ifPresentAndInMemory: [ :tally | + tally terminateTimerProcess]. - Smalltalk at: #MessageTally ifPresent:[:tally| tally terminateTimerProcess]. contents := nil. interruptedProcess := aProcess. interruptedController := aController. contextStackTop := aContext. self newStack: (contextStackTop stackOfSize: 1). contextStackIndex := 1. externalInterrupt := false. selectingPC := true. Smalltalk isMorphic ifTrue: [errorWasInUIProcess := false]!

Nov. 11, 2010

Re: [Pharo-project] Issue 3236 in pharo: Cuis DateAndTime Enhancement

by pharo＠googlecode.com

Updates: Status: FixedWaitingToBePharoed Comment #1 on issue 3236 by stephane.ducasse: Cuis DateAndTime Enhancement http://code.google.com/p/pharo/issues/detail?id=3236 Levente Uzonyi uploaded a new version of Kernel to project The Trunk: http://source.squeak.org/trunk/Kernel-ul.513.mcz ==================== Summary ==================== Name: Kernel-ul.513 Author: ul Time: 7 November 2010, 12:08:10.875 am UUID: 887f4907-c347-2e45-8d2e-dd7814ac4248 Ancestors: Kernel-ul.512 - DateAndTime startup enhancement from Cuis part 2 =============== Diff against Kernel-ul.512 =============== Item was changed: ----- Method: DateAndTime class>>initializeOffsets (in category 'initialize-release') ----- + initializeOffsets + | durationSinceEpoch secondsSinceMidnight nowSecs | + LastTick := 0. + nowSecs := self clock secondsWhenClockTicks. + LastMilliSeconds := self millisecondClockValue. + durationSinceEpoch := Duration + days: SqueakEpoch + hours: 0 + minutes: 0 + seconds: nowSecs. + DaysSinceEpoch := durationSinceEpoch days. + secondsSinceMidnight := (durationSinceEpoch - + (Duration + days: DaysSinceEpoch + hours: 0 + minutes: 0 + seconds: 0)) asSeconds. + MilliSecondOffset := secondsSinceMidnight * 1000 - LastMilliSeconds! - initializeOffsets - - | epochianSeconds secondsSinceMidnight nowSecs | - - LastTick := 0. - - nowSecs := self clock secondsWhenClockTicks. - LastMilliSeconds := self millisecondClockValue. - - epochianSeconds := Duration days: SqueakEpoch hours: 0 minutes: 0 seconds: nowSecs. - - DaysSinceEpoch := epochianSeconds days. - - secondsSinceMidnight := (epochianSeconds - (Duration days: DaysSinceEpoch hours: 0 minutes: 0 seconds: 0)) asSeconds. - - MilliSecondOffset := (secondsSinceMidnight * 1000 - LastMilliSeconds) - ! Item was changed: ----- Method: DateAndTime class>>milliSecondsSinceMidnight (in category 'squeak protocol') ----- milliSecondsSinceMidnight - | msm msClock | - - msClock := self millisecondClockValue. + "This is usually only during system startup..." + self waitForOffsets. - ( - msClock < LastMilliSeconds) - ifTrue:[ "rolled over" MilliSecondOffset := MilliSecondOffset + (SmallInteger maxVal // 2) + 1 ]. + msClock := self millisecondClockValue. + msClock < LastMilliSeconds ifTrue: [ "rolled over" + MilliSecondOffset := MilliSecondOffset + (SmallInteger maxVal // 2) + 1 ]. LastMilliSeconds := msClock. + [ + msm := msClock + MilliSecondOffset. + msm >= 86400000 ] whileTrue: [ + "next day" + LastTick := -1. + DaysSinceEpoch := DaysSinceEpoch + 1. + MilliSecondOffset := MilliSecondOffset - 86400000 ]. - - [ msm := msClock + MilliSecondOffset. - (msm >= 86400000) ] - whileTrue: [ "next day" - LastTick := -1. - DaysSinceEpoch := DaysSinceEpoch + 1. - MilliSecondOffset := MilliSecondOffset - 86400000 ]. - "day rolled over sanity check" + (LastTick = -1 and: [ + (Duration + days: SqueakEpoch + hours: 0 + minutes: 0 + seconds: self clock totalSeconds) days ~= DaysSinceEpoch ]) ifTrue: [ + self initializeOffsets. + ^ self milliSecondsSinceMidnight ]. + ^ msm.! - ((LastTick = -1) and: [ - (Duration days: SqueakEpoch hours: 0 minutes: 0 seconds: (self clock totalSeconds)) days ~= DaysSinceEpoch ]) - ifTrue: - [ self initializeOffsets. - ^ self milliSecondsSinceMidnight ]. - - ^msm - - - - ! Item was changed: ----- Method: DateAndTime class>>now (in category 'ansi protocol') ----- now | nanoTicks msm | nanoTicks := (msm := self milliSecondsSinceMidnight) * 1000000. (LastTick < nanoTicks) ifTrue: [ LastTick := nanoTicks. ^ self todayAtMilliSeconds: msm]. + LastTickSemaphore critical: [ - LastTickSemaphore critical: [ LastTick := LastTick + 1. ^ self todayAtNanoSeconds: LastTick] " [ 10000 timesRepeat: [ self now. ] ] timeToRun / 10000.0 . If calls to DateAndTime-c-#now are within a single millisecond the semaphore code to ensure that (self now <= self now) slows things down considerably by a factor of about 20. The actual speed of a single call to DateAndTime-now in milliseconds is demonstrated by the unguarded method below. [ 100000 timesRepeat: [ self todayAtMilliSeconds: (self milliSecondsSinceMidnight) ] ] timeToRun / 100000.0 . 0.00494 0.00481 0.00492 0.00495 "! Item was changed: ----- Method: DateAndTime class>>startUp: (in category 'initialize-release') ----- + startUp: resuming + resuming ifFalse: [ ^ self ]. + OffsetsAreValid := false. + [ + self initializeOffsets. + OffsetsAreValid := true + ] forkAt: Processor userInterruptPriority.! - startUp: resuming - - resuming ifFalse: [^ self]. - - [ self initializeOffsets ] fork. - - ! Item was changed: ----- Method: DateAndTime class>>todayAtMilliSeconds: (in category 'squeak protocol') ----- todayAtMilliSeconds: milliSecondsSinceMidnight + "This is usually only during system startup..." + self waitForOffsets. + ^ self basicNew setJdn: DaysSinceEpoch seconds: (milliSecondsSinceMidnight // 1000) nano: (milliSecondsSinceMidnight \\ 1000 * 1000000 ) offset: self localOffset " + [ 100000 timesRepeat: [ self fromMilliSeconds: self milliSecondsSinceMidnight. ] ] timeToRun. - [ 100000 timesRepeat: [ self fromMilliSeconds: self milliSecondsSinceMidnight. ] ] timeToRun. "! Item was changed: ----- Method: DateAndTime class>>todayAtNanoSeconds: (in category 'squeak protocol') ----- todayAtNanoSeconds: nanoSecondsSinceMidnight + "This is usually only during system startup..." + self waitForOffsets. + ^ self basicNew setJdn: DaysSinceEpoch seconds: (nanoSecondsSinceMidnight // 1000000000) nano: (nanoSecondsSinceMidnight \\ 1000000000 ) offset: self localOffset ! Item was added: + ----- Method: DateAndTime class>>waitForOffsets (in category 'initialize-release') ----- + waitForOffsets + OffsetsAreValid ifFalse: [ + [ + (Delay forSeconds: 1) wait. + OffsetsAreValid + ] whileFalse + ]!

Nov. 11, 2010

[Pharo-project] Issue 3236 in pharo: Cuis DateAndTime Enhancement

by pharo＠googlecode.com

Status: Accepted Owner: stephane.ducasse Labels: Type-Squeak New issue 3236 by stephane.ducasse: Cuis DateAndTime Enhancement http://code.google.com/p/pharo/issues/detail?id=3236 Levente Uzonyi uploaded a new version of Kernel to project The Trunk: http://source.squeak.org/trunk/Kernel-ul.512.mcz ==================== Summary ==================== Name: Kernel-ul.512 Author: ul Time: 7 November 2010, 12:05:13.149 am UUID: f35cd221-68a5-f04b-b6bc-d07df326b3d3 Ancestors: Kernel-nice.511 - DateAndTime startup enhancement from Cuis part 1 =============== Diff against Kernel-nice.511 =============== Item was changed: Magnitude subclass: #DateAndTime instanceVariableNames: 'seconds offset jdn nanos' + classVariableNames: 'ClockProvider DaysSinceEpoch LastMilliSeconds LastTick LastTickSemaphore LocalTimeZone MilliSecondOffset OffsetsAreValid' - classVariableNames: 'ClockProvider DaysSinceEpoch LastMilliSeconds LastTick LastTickSemaphore LocalTimeZone MilliSecondOffset' poolDictionaries: 'ChronologyConstants' category: 'Kernel-Chronology'! !DateAndTime commentStamp: 'brp 5/13/2003 08:07' prior: 0! I represent a point in UTC time as defined by ISO 8601. I have zero duration. My implementation uses three SmallIntegers and a Duration: jdn - julian day number. seconds - number of seconds since midnight. nanos - the number of nanoseconds since the second. offset - duration from UTC. The nanosecond attribute is almost always zero but it defined for full ISO compliance and is suitable for timestamping. ! Item was added: + (PackageInfo named: 'Kernel') postscript: 'DateAndTime classPool at: #OffsetsAreValid put: true'!

Nov. 11, 2010

[Pharo-project] Issue 3235 in pharo: better bag sum

by pharo＠googlecode.com

Status: FixedWaitingToBePharoed Owner: stephane.ducasse Labels: Type-Squeak Difficulty-Easy New issue 3235 by stephane.ducasse: better bag sum http://code.google.com/p/pharo/issues/detail?id=3235 - reimplemented Bag >> #sum to fix http://bugs.squeak.org/view.php?id=6560 =============== Diff against Collections-ul.402 =============== Item was changed: ----- Method: Bag>>sum (in category 'math functions') ----- sum "Faster than the superclass implementation when you hold many instances of the same value (which you probably do, otherwise you wouldn't be using a Bag)." + + | sum first | + first := true. + contents keysAndValuesDo: [ :value :count | + first + ifTrue: [ sum := value * count. first := false ] + ifFalse: [ sum := sum + (value * count) ] ]. + first ifTrue: [ self errorEmptyCollection ]. - | sum | - sum := 0. - contents keysAndValuesDo: [:value :count | sum := sum + (value * count)]. ^sum!

Nov. 11, 2010

[Pharo-project] Issue 3234 in pharo: fold: reduce: Merge

by pharo＠googlecode.com

Status: FixedWaitingToBePharoed Owner: stephane.ducasse Labels: Type-Squeak New issue 3234 by stephane.ducasse: fold: reduce: Merge http://code.google.com/p/pharo/issues/detail?id=3234 I imagine that reduce: and fold: are not the same in pharo so we should pay attention. Name: Collections-ul.403 Author: ul Time: 7 November 2010, 1:55:55.898 am UUID: 7f81b384-8004-cd44-81e0-9b294d999c8a Ancestors: Collections-ul.402 - merged Collection's #fold: and #reduce: (it's a bit faster than the original versions :)) Item was changed: ----- Method: Collection>>fold: (in category 'enumerating') ----- fold: binaryBlock "Evaluate the block with the first two elements of the receiver, then with the result of the first evaluation and the next element, and so on. Answer the result of the final evaluation. If the receiver is empty, raise an error. If the receiver has a single element, answer that element." "#('if' 'it' 'is' 'to' 'be' 'it' 'is' 'up' 'to' 'me') fold: [:a :b | a, ' ', b]" + ^self reduce: binaryBlock! - | firstValue nextValue | - firstValue := nextValue := Object new. "something that can't be in the receiver" - self do: - [:each | - nextValue := firstValue == nextValue - ifTrue: [each] - ifFalse: [binaryBlock value: nextValue value: each]]. - ^nextValue == firstValue - ifTrue: [self errorEmptyCollection] - ifFalse: [nextValue]! Item was changed: ----- Method: Collection>>reduce: (in category 'enumerating') ----- reduce: binaryBlock "Apply the argument, binaryBlock cumulatively to the elements of the receiver. For sequenceable collections the elements will be used in order, for unordered collections the order is unspecified." | first nextValue | - self emptyCheck. first := true. + self do: [ :each | + first + ifTrue: [ nextValue := each. first := false ] + ifFalse: [ nextValue := binaryBlock value: nextValue value: each ] ]. + first ifTrue: [ self errorEmptyCollection ]. - self do:[:each| - first ifTrue:[nextValue := each. first := false] - ifFalse:[nextValue := binaryBlock value: nextValue value: each]]. ^nextValue!

Nov. 11, 2010

[Pharo-project] Issue 3233 in pharo: Tests for WeakSet

by pharo＠googlecode.com

Status: FixedWaitingToBePharoed Owner: stephane.ducasse Labels: Type-Squeak New issue 3233 by stephane.ducasse: Tests for WeakSet http://code.google.com/p/pharo/issues/detail?id=3233 Levente Uzonyi uploaded a new version of CollectionsTests to project The Trunk: http://source.squeak.org/trunk/CollectionsTests-ul.175.mcz ==================== Summary ==================== Name: CollectionsTests-ul.175 Author: ul Time: 7 November 2010, 3:17:19.921 am UUID: 4b82952d-1507-5249-ba8a-9f93a4aaa9f9 Ancestors: CollectionsTests-ul.174 - integrated tests for WeakSet from http://bugs.squeak.org/view.php?id=7350 =============== Diff against CollectionsTests-ul.174 =============== Item was added: + ----- Method: WeakSetTest>>testAddIncludesSizeReclaim (in category 'testing') ----- + testAddIncludesSizeReclaim + | ws o2 o3 | + o2 := 1/2. + o3 := '123' copy. + ws := WeakSet new. + ws add: o2. + ws add: o3. + self assert: ws size = 2. + self assert: (ws includes: o2). + self assert: (ws includes: o3). + + "inclusion test does use equality, not identity" + self assert: (ws includes: o3 copy) description: 'WeakSet are not WeakIdentitySet'. + + "only one copy is added" + ws add: o3 copy. + self assert: ws size = 2. + + "reclame objects so that slots of ws are nilled out" + o2 := o3 := nil. + Smalltalk garbageCollect. + self deny: (ws includes: 1/2). + self deny: (ws includes: '123' copy). + + "fast #size is not updated automatically by dead object reclamation + But there is a slowSize trying to tell the truth" + self assert: ws slowSize = 0.! Item was added: + ----- Method: WeakSetTest>>testCollisions (in category 'testing') ----- + testCollisions + + | ws o1 o2 o5 on remember forget | + + "create a weak set" + ws := WeakSet new: 15. + + "select some fractions wanting same place in ws array" + o1 := (2 to: 100) select: [:i | (ws scanFor: 1 / i) == 1]. + o2 := (2 to: 100) select: [:i | (ws scanFor: 1 / i) == 2]. + o5 := (2 to: 100) select: [:i | (ws scanFor: 1 / i) == 5]. + on := (2 to: 100) select: [:i | (ws scanFor: 1 / i) == (ws array size - 1)]. + + "Add some fractions to the weak set, and remember a pointer for a few of them" + remember := OrderedCollection new. + forget := OrderedCollection new. + ws add: (remember add: 1 / o1 first). + ws add: (forget add: 1 / on second). + ws add: (forget add: 1 / o1 second). + ws add: (forget add: 1 / o5 second). + ws add: (forget add: 1 / o2 second). + ws add: (forget add: 1 / o1 third). + ws add: (remember add: 1 / o2 first). + ws add: (forget add: 1 / o5 third). + ws add: (forget add: 1 / on third). + ws add: (remember add: 1 / o2 fourth). + ws add: (remember add: 1 / on first). + ws add: (remember add: 1 / o5 first). + + "forget and reclaim all entries but those in remember" + forget := nil. + Smalltalk garbageCollect. + + remember do: [:m | self assert: (ws includes: m)]. + ws add: 1/on second. + remember do: [:m | self assert: (ws includes: m)]. + + ws add: (remember add: 1 / o1 fourth). + ws add: (remember add: 1 / on fourth). + remember remove: (ws remove: (1 / o5 first)). + remember remove: (ws remove: (1 / on first)). + remember remove: (ws remove: (1 / o2 first)). + remember remove: (ws remove: (1 / o1 first)). + remember do: [:m | self assert: (ws includes: m)]. + ws add: 1/on second. + ws add: 1/o5 second. + remember do: [:m | self assert: (ws includes: m)]. + ! Item was added: + ----- Method: WeakSetTest>>testDoDontIterateOnReclaimedObjects (in category 'testing') ----- + testDoDontIterateOnReclaimedObjects + + | ws o1 o2 size | + ws := WeakSet new. + 2 to: 20 do: [:i | ws add: 1 / i]. + + o1 := 3.0. + o2 := 4.0. + ws add: o1; add: o2. + + "Reclaim memory" + Smalltalk garbageCollect. + + size := 0. + ws do: [:each | + size := size + 1. + self deny: each isNil]. + + self assert: size = 2! Item was added: + ----- Method: WeakSetTest>>testGrowWhenNecessary (in category 'testing') ----- + testGrowWhenNecessary + | ws objs initialSize | + objs := (2 to: 20) collect: [:i | 1 / i]. + ws := WeakSet new: 5. + initialSize := ws array size. + 1 to: objs size do: [:k | ws add: (objs at: k)]. + self assert: ws array size > initialSize + description: 'The WeakSet grown because not enough room were preallocated'.! Item was added: + ----- Method: WeakSetTest>>testIncludesNil (in category 'testing') ----- + testIncludesNil + + | ws | + ws := WeakSet new. + self deny: (ws includes: nil). + + "After reclamation, should not includes nil: nil counts for nothing" + ws add: 1/2. + ws add: 1/3. + Smalltalk garbageCollect. + self deny: (ws includes: nil).!

Nov. 11, 2010

[Pharo-project] Issue 3232 in pharo: SharedQueue code simplication

by pharo＠googlecode.com

Status: FixedWaitingToBePharoed Owner: stephane.ducasse Labels: Type-Squeak New issue 3232 by stephane.ducasse: SharedQueue code simplication http://code.google.com/p/pharo/issues/detail?id=3232 We should really review carefully this changes A new version of Collections was added to project The Inbox: http://source.squeak.org/inbox/Collections-ul.404.mcz ==================== Summary ==================== Name: Collections-ul.404 Author: ul Time: 7 November 2010, 4:52:11.401 am UUID: 2e0defd1-6e46-7243-be6f-b571c6805ae4 Ancestors: Collections-ul.403 - simplified SharedQueue >> #makeRoomAtEnd - enhanced SharedQueue >> #peek =============== Diff against Collections-ul.403 =============== Item was changed: ----- Method: SharedQueue>>makeRoomAtEnd (in category 'private') ----- makeRoomAtEnd + | contentsSize newContentsArray | - | contentsSize | contentsSize := writePosition - readPosition. + newContentsArray := contentsSize * 2 > contentsArray size + ifTrue: [ contentsArray class new: contentsArray size * 2 ] - contentsSize * 2 > contentsArray size - ifTrue: [ - "grow" - contentsArray := (contentsArray class new: contentsArray size * 2) - replaceFrom: 1 - to: contentsSize - with: contentsArray - startingAt: readPosition; - yourself ] ifFalse: [ (contentsArray size > 10 and: [ contentsSize * 4 <= contentsArray size ]) + ifTrue: [ contentsArray class new: (contentsSize * 2 max: 10) ] + ifFalse: [ contentsArray ] ]. + newContentsArray + replaceFrom: 1 + to: contentsSize + with: contentsArray + startingAt: readPosition. + contentsArray == newContentsArray + ifFalse: [ contentsArray := newContentsArray ] + ifTrue: [ contentsArray from: contentsSize + 1 to: contentsArray size put: nil ]. - ifTrue: [ - "shrink" - contentsArray := (contentsArray class new: (contentsSize * 2 max: 10)) - replaceFrom: 1 - to: contentsSize - with: contentsArray - startingAt: readPosition; - yourself ] - ifFalse: [ - "just move the elements to the front" - contentsArray - replaceFrom: 1 - to: contentsSize - with: contentsArray - startingAt: readPosition. - contentsArray - from: contentsSize + 1 - to: contentsArray size - put: nil ] ]. readPosition := 1. writePosition := contentsSize + 1! Item was changed: ----- Method: SharedQueue>>peek (in category 'accessing') ----- peek "Answer the object that was sent through the receiver first and has not yet been received by anyone but do not remove it from the receiver. If no object has been sent, return nil" + readSynch isSignaled ifFalse: [ ^nil ]. + ^accessProtect critical: [ + readPosition >= writePosition ifFalse: [ + contentsArray at: readPosition ] ]! - ^accessProtect - critical: [ - | value | - readPosition >= writePosition - ifTrue: [readPosition := 1. - writePosition := 1. - value := nil] - ifFalse: [value := contentsArray at: readPosition]. - value].!

Nov. 11, 2010