author | Claus Gittinger <cg@exept.de> |
Thu, 30 Jan 1997 15:07:11 +0100 | |
changeset 2329 | 937fc97d5544 |
parent 2315 | a9ff2fda8bae |
child 2738 | 2546e06df154 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1992 by Claus Gittinger |
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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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IdentityDictionary subclass:#WeakIdentityDictionary |
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instanceVariableNames:'' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Collections-Unordered' |
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! |
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!WeakIdentityDictionary class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1992 by Claus Gittinger |
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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 |
|
29 |
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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||
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documentation |
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" |
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WeakIdentityDictionaries behave like IdentityDictionaries, |
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as long as the keys are still referenced by some |
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other (non-weak) object. |
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However, once the last non-weak reference ceases to exist, |
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the object will be automatically removed from the Weakcollection |
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(with some delay: it will be removed after the next garbage collect). |
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This class was added to support keeping track of dependents without |
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keeping the values alive - values simply become nil when no one else |
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references it. The original dependency mechanism used a regular Dictionary, |
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which usually leads to a lot of garbage being kept due to a forgotten |
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release. Using a WeakDictionary may be incompatible to ST-80 but is much |
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more comfortable, since no manual release of dependents is needed. |
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[Warning:] |
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If you use this, be very careful since the collections size changes |
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'magically' - for example, testing for being nonEmpty and then |
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removing the first element may fail, since the element may vanish inbetween. |
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In general, never trust the value as returned by the size/isEmpty messages. |
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[author:] |
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Claus Gittinger |
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[See also:] |
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WeakArray WeakValueDictionary WeakIdentitySet |
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! ! |
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!WeakIdentityDictionary methodsFor:'adding & removing'! |
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at:key |
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|val| |
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(OperatingSystem blockInterrupts) ifTrue:[ |
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"/ already blocked |
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^ super at:key. |
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]. |
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val := super at:key. |
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] valueNowOrOnUnwindDo:[ |
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OperatingSystem unblockInterrupts. |
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]. |
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^ val |
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"Modified: 6.5.1996 / 12:22:26 / stefan" |
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"Modified: 29.1.1997 / 15:07:44 / cg" |
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! |
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at:key ifAbsent:exceptionBlock |
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|val| |
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(OperatingSystem blockInterrupts) ifTrue:[ |
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"/ already blocked |
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^ super at:key ifAbsent:exceptionBlock. |
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]. |
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[ |
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val := super at:key ifAbsent:exceptionBlock. |
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] valueNowOrOnUnwindDo:[ |
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OperatingSystem unblockInterrupts. |
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]. |
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^ val |
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"Modified: 6.5.1996 / 12:22:26 / stefan" |
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"Modified: 29.1.1997 / 15:08:07 / cg" |
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! |
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at:key put:anObject |
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"add the argument anObject under key, aKey to the receiver. |
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Return anObject (sigh). |
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Redefined to block interrupts, to avoid trouble when dependencies |
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are added within interrupting high prio processes." |
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|val| |
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(OperatingSystem blockInterrupts) ifTrue:[ |
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"/ already blocked |
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^ super at:key put:anObject. |
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]. |
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[ |
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val := super at:key put:anObject. |
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] valueNowOrOnUnwindDo:[ |
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OperatingSystem unblockInterrupts. |
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]. |
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^ val |
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"Modified: 6.5.1996 / 12:22:26 / stefan" |
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"Modified: 29.1.1997 / 15:08:45 / cg" |
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! |
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removeKey:aKey ifAbsent:aBlock |
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"remove the association under aKey from the collection, |
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return the value previously stored there.. |
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If it was not in the collection return the result |
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from evaluating aBlock. |
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Redefined to avoid synchronization problems, in case |
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of interrupts (otherwise, there could be some other operation |
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on the receiver done by another process, which garbles my contents)." |
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|ret| |
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(OperatingSystem blockInterrupts) ifTrue:[ |
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"/ already blocked |
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^ super removeKey:aKey ifAbsent:aBlock. |
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]. |
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[ |
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ret := super removeKey:aKey ifAbsent:aBlock |
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] valueNowOrOnUnwindDo:[ |
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OperatingSystem unblockInterrupts |
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]. |
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^ ret |
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"Modified: 6.5.1996 / 12:44:51 / stefan" |
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"Modified: 29.1.1997 / 15:09:11 / cg" |
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! ! |
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!WeakIdentityDictionary methodsFor:'element disposal'! |
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update:something with:aParameter from:changedObject |
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"an element (either key or value) died - clear out slots for |
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disposed keys." |
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|wasBlocked| |
358 | 168 |
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something == #ElementExpired ifTrue:[ |
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" |
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have to block here - dispose may be done at a low priority |
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from the background finalizer. If new items are added by a |
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higher prio process, the dictionary might get corrupted otherwise |
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" |
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wasBlocked := OperatingSystem blockInterrupts. |
10 | 176 |
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keyArray |
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forAllDeadIndicesDo:[:idx | |
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valueArray basicAt:idx put:nil. |
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tally := tally - 1. |
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] |
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replacingCorpsesWith:DeletedEntry. |
358 | 183 |
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wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
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] |
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|
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"Created: 7.1.1997 / 16:59:30 / stefan" |
6 | 188 |
! ! |
609 | 189 |
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190 |
!WeakIdentityDictionary methodsFor:'private'! |
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findKeyOrNil:key |
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"Look for the key in the receiver. |
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If it is found, return return the index, |
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otherwise the index of the first unused slot. |
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Grow the receiver, if key was not found, and no unused slots were present. |
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|
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Warning: an empty slot MUST be filled by the sender - it is only to be sent |
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by at:put: / add: - like methods." |
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|
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|index "{ Class:SmallInteger }" |
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length "{ Class:SmallInteger }" |
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startIndex probe |
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delIndex "{ Class:SmallInteger }"| |
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|
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(OperatingSystem blockInterrupts) ifFalse:[ |
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"/ |
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"/ may never be entered with interrupts enabled |
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"/ |
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210 |
OperatingSystem unblockInterrupts. |
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211 |
self error:'oops - unblocked call of findKeyOrNil'. |
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212 |
^ nil "/ leads to another error, if proceeded |
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213 |
]. |
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214 |
|
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delIndex := 0. |
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216 |
|
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length := keyArray basicSize. |
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index := key identityHash. |
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index < 16r1FFFFFFF ifTrue:[ |
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index := index * 2 |
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221 |
]. |
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222 |
index := index \\ length + 1. |
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startIndex := index. |
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224 |
|
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225 |
[true] whileTrue:[ |
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226 |
probe := keyArray basicAt:index. |
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227 |
key == probe ifTrue:[^ index]. |
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probe isNil ifTrue:[ |
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229 |
delIndex == 0 ifTrue:[^ index]. |
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230 |
keyArray basicAt:delIndex put:nil. |
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231 |
^ delIndex |
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232 |
]. |
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233 |
|
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234 |
probe == 0 ifTrue:[ |
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235 |
probe := DeletedEntry. |
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236 |
keyArray basicAt:index put:probe. |
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237 |
valueArray basicAt:index put:nil. |
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238 |
tally := tally - 1. |
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239 |
]. |
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240 |
|
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241 |
delIndex == 0 ifTrue:[ |
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242 |
probe == DeletedEntry ifTrue:[ |
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243 |
delIndex := index |
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244 |
] |
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245 |
]. |
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|
246 |
|
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247 |
index == length ifTrue:[ |
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248 |
index := 1 |
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249 |
] ifFalse:[ |
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250 |
index := index + 1 |
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251 |
]. |
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252 |
index == startIndex ifTrue:[ |
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253 |
delIndex ~~ 0 ifTrue:[ |
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|
254 |
keyArray basicAt:delIndex put:nil. |
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|
255 |
^ delIndex |
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256 |
]. |
2329
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|
257 |
^ self grow findKeyOrNil:key |
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258 |
]. |
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|
259 |
] |
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|
260 |
|
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|
261 |
"Modified: 30.1.1997 / 15:04:34 / cg" |
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|
262 |
! |
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|
263 |
|
2298 | 264 |
grow:newSize |
265 |
"grow the receiver. |
|
266 |
Redefined to block interrupts, to avoid trouble when dependencies |
|
267 |
are added within interrupting high prio processes." |
|
268 |
||
2303
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|
269 |
"/ 'grow:' printCR. |
2298 | 270 |
|
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|
271 |
(OperatingSystem blockInterrupts) ifTrue:[ |
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|
272 |
"/ already blocked |
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|
273 |
^ super grow:newSize. |
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|
274 |
]. |
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|
275 |
|
2298 | 276 |
[ |
277 |
super grow:newSize |
|
278 |
] valueNowOrOnUnwindDo:[ |
|
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|
279 |
OperatingSystem unblockInterrupts |
2298 | 280 |
]. |
281 |
||
282 |
"Created: 28.1.1997 / 23:41:39 / cg" |
|
2303
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|
283 |
"Modified: 29.1.1997 / 15:10:12 / cg" |
2298 | 284 |
! |
285 |
||
609 | 286 |
keyContainerOfSize:n |
287 |
"return a container for keys of size n. |
|
2298 | 288 |
use WeakArrays here, but dont make me a depenent of it." |
609 | 289 |
|
290 |
|w| |
|
291 |
||
292 |
w := WeakArray new:n. |
|
2091
c11bb3e29a1b
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|
293 |
w addDependent:self. |
609 | 294 |
^ w |
2091
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changeset
|
295 |
|
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|
296 |
"Modified: 7.1.1997 / 17:01:15 / stefan" |
2298 | 297 |
"Modified: 29.1.1997 / 14:18:49 / cg" |
298 |
! |
|
299 |
||
300 |
rehash |
|
301 |
"grow the receiver. |
|
302 |
Redefined to block interrupts, to avoid trouble when dependencies |
|
303 |
are added within interrupting high prio processes." |
|
304 |
||
305 |
"/ 'rehash' printCR. |
|
306 |
||
2303
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|
307 |
(OperatingSystem blockInterrupts) ifTrue:[ |
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|
308 |
"/ already blocked |
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|
309 |
^ super rehash. |
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|
310 |
]. |
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|
311 |
|
2298 | 312 |
[ |
313 |
super rehash |
|
314 |
] valueNowOrOnUnwindDo:[ |
|
2303
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|
315 |
OperatingSystem unblockInterrupts |
2298 | 316 |
]. |
317 |
||
318 |
"Created: 29.1.1997 / 11:39:42 / cg" |
|
319 |
"Modified: 29.1.1997 / 14:18:52 / cg" |
|
320 |
! |
|
321 |
||
322 |
setTally:count |
|
323 |
"grow the receiver. |
|
324 |
Redefined to block interrupts, to avoid trouble when dependencies |
|
325 |
are added within interrupting high prio processes." |
|
326 |
||
2303
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|
327 |
"/ 'setTally:' printCR. |
2298 | 328 |
|
2303
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|
329 |
(OperatingSystem blockInterrupts) ifTrue:[ |
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|
330 |
"/ already blocked |
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|
331 |
^ super setTally:count. |
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|
332 |
]. |
f19df2d4c238
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parents:
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changeset
|
333 |
|
2298 | 334 |
[ |
335 |
super setTally:count |
|
336 |
] valueNowOrOnUnwindDo:[ |
|
2303
f19df2d4c238
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parents:
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|
337 |
OperatingSystem unblockInterrupts |
2298 | 338 |
]. |
339 |
||
340 |
"Created: 29.1.1997 / 11:40:12 / cg" |
|
2303
f19df2d4c238
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|
341 |
"Modified: 29.1.1997 / 15:11:11 / cg" |
609 | 342 |
! ! |
343 |
||
635 | 344 |
!WeakIdentityDictionary class methodsFor:'documentation'! |
345 |
||
346 |
version |
|
2329
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|
347 |
^ '$Header: /cvs/stx/stx/libbasic/WeakIdentityDictionary.st,v 1.29 1997-01-30 14:07:11 cg Exp $' |
635 | 348 |
! ! |