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- Subject: Re: Garbage collection
- From: James McCartney <asynth@...>
- Date: Fri, 1 Nov 2002 14:10:01 -0800
On Friday, November 1, 2002, at 12:32 PM, Steve Dekorte wrote:
On Friday, November 1, 2002, at 12:21 PM, James McCartney wrote:
On Thursday, October 31, 2002, at 03:59 PM, Steve Dekorte wrote:
so only the freed objects are touched on a sweep.
Just to press the point, with Baker's treadmill you don't even have
to do that.
I just made a small change to make the definitions of black and white
dynamic that avoids it. Maybe this is equivalent to "Baker's
treadmill"? The descriptions I've read of it weren't very clear to me.
With the treadmill you've got linked lists of grey, black, white and
free. To scan an object you remove it from the grey list to black and
put all of the objects it points to onto the grey list. Once the grey
list is exhausted then everything on the white list is not live and so
the entire white list can be linked onto the free list. This requires
changing 6 list pointers. Then you change the meaning of the color bits
so that black now means white and start over.
With a treadmill, since there is no sweep then there is not a built in
way to do finalization. There are ways to get around it, such as using
a separate treadmill for finalizable objects and sweeping that one. I
used that for a while, but decided to it would be better for real time
performance to avoid finalization altogether. Instead I put things that
need to be finalized onto a known live list (e.g. 'allOpenFiles') to
keep them live until I manually close them.
--- james mccartney email@example.com <http://www.audiosynth.com>
SuperCollider - a real time synthesis programming language for the