Subj : Re: GC question
To   : netscape.public.mozilla.jseng
From : Sterling Bates
Date : Fri May 28 2004 08:02 am

lyg wrote:
>>Try deleting the object from whatever scope you've created it under.
>>
> 
>    Thanks for your answer,but i am sorry, I do not understand the upper
> sentence.

I was referring to JS_DeleteProperty, but it seems JS_ClearScope fixes 
your issue :)

>    JS_RemoveRoot(cx, &rootedObj);
>    JS_ClearScope(cx, rootedObj);
> 
> would someone tell me why I must JS_ClearScope(cx, rootedObj)?
> thanks again.

If I understand GCing correctly, it does not attempt to free objects 
that are tied to a scope (ie another object).  If you are creating your 
rootedObjs as properties of the global object, they will not be GCed 
until they are no longer properties of that object.

See the last GC example at 
http://www.mozilla.org/js/spidermonkey/gctips.html.  The array object 
needs to be rooted immediately, but the JSStrings created later do not 
require rooting since they are (very quickly) scoped to the array.

I'm sure Brendan will correct me if I'm way off.

Sterling

.