[squeak-dev] Re: lock up in screen drag

marcel.taeumel Marcel.Taeumel at hpi.de
Tue Jul 19 04:43:15 UTC 2016

Eliot Miranda-2 wrote
> Hi ALl,
>    I'm seeing a lock up that appears to be on window dragging.  This is on
> Mac OS X with a new VM.  The symptom is that the screen goes blank.  I see
> this process when sending SIGUSR1 to the process:
> Process  0x4800ad0 priority 40
> 0xbffac304 M [] in Delay>wait 0x4802858: a(n) Delay
> 0xbffac324 M BlockClosure>ifCurtailed: 0x4a920e0: a(n) BlockClosure
> 0xbffac340 M Delay>wait 0x4802858: a(n) Delay
> 0xbffac36c M Rectangle>newRectFrom: 0x4803df0: a(n) Rectangle
> 0xbffac39c I PluggableSystemWindow(SystemWindow)>doFastFrameDrag:
> 0x4802740: a(n) PluggableSystemWindow
> 0xbffac3b8 M PluggableSystemWindow(SystemWindow)>startDragFromLabel:
> 0x4802740: a(n) PluggableSystemWindow
> 0xbffac3d8 M EventHandler>send:to:withEvent:fromMorph: 0x4803f30: a(n)
> EventHandler
> 0xbffac408 I EventHandler>startDrag:fromMorph: 0x4803f30: a(n)
> EventHandler
> 0xbffac428 M StringMorph(Morph)>startDrag: 0x4801458: a(n) StringMorph
> 0xbffac44c I MouseClickState>drag: 0x4803fc8: a(n) MouseClickState
> 0xbffac474 M MouseClickState>handleEvent:from: 0x4803fc8: a(n)
> MouseClickState
> 0xbffac498 M HandMorph>handleEvent: 0x5cef1a0: a(n) HandMorph
> 0xbffac4c4 M HandMorph>processEvents 0x5cef1a0: a(n) HandMorph
> 0xbffac4e0 M [] in WorldState>doOneCycleNowFor: 0x5d1ba70: a(n) WorldState
> 0xbffac504 M Array(SequenceableCollection)>do: 0x4e6fa10: a(n) Array
> 0xbffac520 M WorldState>handsDo: 0x5d1ba70: a(n) WorldState
> 0xbffac540 M WorldState>doOneCycleNowFor: 0x5d1ba70: a(n) WorldState
> 0xbffac55c M WorldState>doOneCycleFor: 0x5d1ba70: a(n) WorldState
> 0xbffac578 M PasteUpMorph>doOneCycle 0x52d8780: a(n) PasteUpMorph
> 0xbffac590 M [] in MorphicProject>spawnNewProcess 0x604fe08: a(n)
> MorphicProject
> 0xbffac5b0 I [] in BlockClosure>newProcess 0x48040b8: a(n) BlockClosure
> _,,,^..^,,,_
> best, Eliot

Hi Eliot,

since you are calling Rectangle >>#newRectFrom:, I suppose you have "Fast
Morphic Drag" enabled. There, you continuously call Form >>

Hence, I think some latest changes in the VM's graphics backend for Mac OSX
are buggy.

Btw: A while ago, Bert did observe that fast drag is faster in SqueakJS than
it is in the Mac OSX build of the CogVM. :-D What's the current state of


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