* Implementation of the promise smob
@ 2010-08-20 2:10 Abhijeet More
2010-08-20 4:43 ` Andy Wingo
0 siblings, 1 reply; 2+ messages in thread
From: Abhijeet More @ 2010-08-20 2:10 UTC (permalink / raw)
To: guile-user, Tibi Turbureanu, Andy Wingo
Hi,
I noticed that the implementation of the "promise" smob did not have
any "mark" function defined.
This smob does contain a couple of other SCM objects.
Can someone explain how these objects are not cleared up by the gc
(since nobody marks them as live)?
Thanks
Abhijeet
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Implementation of the promise smob
2010-08-20 2:10 Implementation of the promise smob Abhijeet More
@ 2010-08-20 4:43 ` Andy Wingo
0 siblings, 0 replies; 2+ messages in thread
From: Andy Wingo @ 2010-08-20 4:43 UTC (permalink / raw)
To: Abhijeet More; +Cc: guile-user, Tibi Turbureanu
On Thu 19 Aug 2010 19:10, Abhijeet More <abhijeet.more@gmail.com> writes:
> Hi,
> I noticed that the implementation of the "promise" smob did not have
> any "mark" function defined.
> This smob does contain a couple of other SCM objects.
>
> Can someone explain how these objects are not cleared up by the gc
> (since nobody marks them as live)?
If you do not provide a mark function, the GC will treat all words in an
object as pointers, and mark them.
The problem, I think, is not that the promise refers to its value: it is
that something is mistakenly referring to the promise (and thence to the
value).
Andy
--
http://wingolog.org/
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