The Trunk: Collections-ul.412.mcz

Levente Uzonyi uploaded a new version of Collections to project The Trunk:
http://source.squeak.org/trunk/Collections-ul.412.mcz

==================== Summary ====================

Name: Collections-ul.412
Author: ul
Time: 8 December 2010, 4:46:07.6 am
UUID: 0d255954-d008-d647-91fa-59be37678e29
Ancestors: Collections-ul.411

- SharedQueue fixes

=============== Diff against Collections-ul.411 ===============

Item was changed:
  ----- Method: SharedQueue>>flushAllSuchThat: (in category 'accessing') -----
  flushAllSuchThat: aBlock
  "Remove from the queue all objects that satisfy aBlock."
+
+ accessProtect critical: [
+ | newReadPos |
- ^accessProtect critical: [
- | value newReadPos |
  newReadPos := writePosition.
+ writePosition - 1 to: readPosition by: -1 do: [ :i |
+ | value |
+ value := contentsArray at: i.
- writePosition-1 to: readPosition by: -1 do:
- [:i | value := contentsArray at: i.
  contentsArray at: i put: nil.
+ ((aBlock value: value) and: [ (readSynch waitIfLocked: [ nil ]) notNil ]) ifFalse: [
- (aBlock value: value) ifTrue: [
- "We take an element out of the queue, and therefore, we need to decrement
- the readSynch signals"
- readSynch wait.
- ] ifFalse: [
  newReadPos := newReadPos - 1.
+ contentsArray at: newReadPos put: value ] ].
+ readPosition := newReadPos ]!
- contentsArray at: newReadPos put: value]].
- readPosition := newReadPos.
- value]!

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>>nextOrNil (in category 'accessing') -----
  nextOrNil
  "Answer the object that was sent through the receiver first and has not
  yet been received by anyone. If no object has been sent, answer <nil>."
 
+ readSynch waitIfLocked: [ ^nil ].
+ ^accessProtect
+ critical: [
+ | value |
+ readPosition = writePosition
+ ifTrue:
+ [self error: 'Error in SharedQueue synchronization'.
+ value := nil]
+ ifFalse:
+ [value := contentsArray at: readPosition.
+ contentsArray at: readPosition put: nil.
+ readPosition := readPosition + 1].
+ value ]!
- ^accessProtect critical: [
- | value |
- readPosition >= writePosition ifTrue: [
- value := nil
- ] ifFalse: [
- value := contentsArray at: readPosition.
- contentsArray at: readPosition put: nil.
- readPosition := readPosition + 1
- ].
- readPosition >= writePosition ifTrue: [readSynch initSignals].
- value
- ].!

Item was changed:
  ----- Method: SharedQueue>>nextOrNilSuchThat: (in category 'accessing') -----
  nextOrNilSuchThat: aBlock
  "Answer the next object that satisfies aBlock, skipping any intermediate objects.
  If no object has been sent, answer <nil> and leave me intact.
  NOTA BENE:  aBlock MUST NOT contain a non-local return (^)."
 
  ^accessProtect critical: [
  | value readPos |
  value := nil.
  readPos := readPosition.
+ [ readPos < writePosition and: [ value isNil ] ] whileTrue: [
- [readPos < writePosition and: [value isNil]] whileTrue: [
  value := contentsArray at: readPos.
  readPos := readPos + 1.
+ (aBlock value: value)
+ ifFalse: [ value := nil ]
+ ifTrue: [
+ readSynch waitIfLocked: [ ^nil ]. "We found the value, but someone else booked it."
+ readPosition to: readPos - 1 do: [ :j | contentsArray at: j put: nil ].
+ readPosition := readPos ] ].
+ value ].
- (aBlock value: value) ifTrue: [
- readPosition to: readPos - 1 do: [ :j |
- contentsArray at: j put: nil.
- ].
- readPosition := readPos.
- ] ifFalse: [
- value := nil.
- ].
- ].
- readPosition >= writePosition ifTrue: [readSynch initSignals].
- value.
- ].
  "===
  q := SharedQueue new.
  1 to: 10 do: [ :i | q nextPut: i].
  c := OrderedCollection new.
  [
  v := q nextOrNilSuchThat: [ :e | e odd].
  v notNil
  ] whileTrue: [
  c add: {v. q size}
  ].
  {c. q} explore
  ==="!

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
- ^accessProtect
  critical: [
+ accessProtect critical: [
+ readPosition >= writePosition ifFalse: [
+ contentsArray at: readPosition ] ] ]
+ ifLocked: [ nil ]!
- | value |
- readPosition >= writePosition
- ifTrue: [readPosition := 1.
- writePosition := 1.
- value := nil]
- ifFalse: [value := contentsArray at: readPosition].
- value].!