Subj : GC questions
To   : netscape.public.mozilla.jseng
From : "Brad DeGrazia" <dego_brad@comcast.net>
Date : Thu Jun 19 2003 04:12 am

Currently I'm using SpiderMonkey on a single thread (no problems with it),
but will be opening it up to a multi-threaded environment soon.  My app uses
EvaluateScript to execute scripts that mostly call defined C functions.  Is
it necessary to have any sort of GC protection (Begin/EndRequest) within my
C functions that are called from JavaScript?  I do basic things in there
like extract the passed arguments from argv[] using JS_Value* and set an
appropriate return value (rval) using the JS_New* functions.

Also, I was looking at the Garbage Collecting tips document
http://www.mozilla.org/js/spidermonkey/gctips.html and was wondering if
anyone could explain how in tip #3, "argv[0] = STRING_TO_JSVAL(str1); "
avoids GC problems?  I see that the macro is performing a bitwise OR on the
JSString* str1, but the purpose of this is beyond me.  I ask this because
most of my code extracts string parameters by doing something like this:

CString str( JS_GetStringBytes(JS_ValueToString(argv[0])) );

After reading a bunch of posts, I'm beginning to wonder if that's a misuse
of the JS_ functions.

Thanks,
Brad

.