I had to do two things:
re-assign the variable holding my test object to another (delete was
not enough)
collect the garbage explicitly
static void CollectGarbage (void)
{
syslog (LOG_NOTICE, "collecting garbage");
TryCatch tryCatch;
Local <Context> currentContext (Context::GetCurrent ( ));
Local <Object> global (currentContext->Global ( ));
Local <Value> gc (global->Get (String::New
("gc")));
Local <Function> gcFunc (Function::Cast (*gc));
(void) gcFunc->Call (global, 0, NULL);
syslog (LOG_NOTICE, "collected garbage");
}
(This depends on the --expose-gc flag.)
Interestingly, I don't seem to use tryCatch, having declared it. Hmmm.
Pete Gontier <http://pete.gontier.org/>
On Oct 19, 2008, at 4:32 PM, Anthony Shipman wrote:
>
> I've got code to create a JS object that wraps a C++ object.
> I'm using a weak pointer from the C++ object to the JS object to
> detect when
> the JS object is collected so that I can delete the C++ object.
>
> I can't yet demonstrate that the C++ object is deleted. I wrote a
> simple loop
> in JS
>
> function f()
> {
> for (i = 0; i < 1000; ++i)
> {
> new jfx.ByteBuffer();
> }
> }
>
> and run v8 with the flags
> --log_handles --gc_interval=10 --trace_gc --gc_global
>
> I get debugging messages
>
> constructed byte buffer 0x8a1e0e8, isWeak = 1
> 0x8a1e0e8: isWeak=1, isNearDeath=0
> Mark-sweep 0.4 -> 0.4 MB, 20 ms.
> constructed byte buffer 0x8a440f8, isWeak = 1
> 0x8a1e0e8: isWeak=1, isNearDeath=0
>
> The weak pointers are never marked as NearDeath.
>
> From v8.log I get
>
> GlobalHandle::MakeWeak,0x8a538b4
> GlobalHandle::MakeWeak,0x8a538b4
> markcompact,begin,2,797574,1224457984667
> markcompact,end,2,809572,1224457984679
> scavenge,begin,2,809572,1224457984679
> scavenge,end,2,810572,1224457984679
> GlobalHandle::MakeWeak,0x8a538b4
>
> so you'd think that if the JS objects were no longer referenced then
> I would
> see them deleted.
>
> So what do I have to do to generate garbage in scripts if the above
> for-loop
> doesn't do it.
>
> --
> Anthony Shipman Mamas don't let your babies
> [EMAIL PROTECTED] grow up to be outsourced.
>
> >
--~--~---------~--~----~------------~-------~--~----~
v8-users mailing list
[email protected]
http://groups.google.com/group/v8-users
-~----------~----~----~----~------~----~------~--~---
