Ross,
there is GCExtension in v8 which exposes global gc() function (which
trigger garbage collection).
To enable it you should just pass --expose-gc flag.
See src/bootstrapper.cc, Genesis::InstallExtensions and
src/extensions/gc-extension.{h,cc} for more details.
yours,
anton.
On Wed, Dec 15, 2010 at 7:38 PM, Ross Kinder <[email protected]> wrote:
> On Tue, Dec 14, 2010 at 11:00 AM, Stephan Beal <[email protected]> wrote:
>> On Tue, Dec 14, 2010 at 7:47 PM, Ross Kinder <[email protected]> wrote:
>>>
>>> Is there a way to do this directly that I'm missing?
>>>
>>> How have others handled this situation?
>> Hi!
>> The approach i've taken to this is basically the same as yours. The code is:
>> http://code.google.com/p/v8-juice/source/browse/trunk/src/include/v8/juice/ClassWrap.h?r=1220#1433
>> i think the one thing i do which you don't mention is the call of
>> ClearWeak() on the Persistent Handle.
>> Maybe that helps?
>
> I'm not sure that is actually my current problem, but I can see how it
> would be used.
>
> My primary concern is providing a way to isolate unittests from each
> other. Here is the (somewhat hackish) solution I came up with, for
> feedback/posterity. This appears to solve my problem by causing my
> broken dtors to crash in the current test case, rather than a few
> tests later when GC finally runs. I call
> ForTestingEnsureGarbageCollected() in the tear down of each test case:
>
> void OnGarbageCollected(v8::Persistent<v8::Value> value, void * parameter) {
> *reinterpret_cast<bool *>(parameter) = true;
> value.Dispose();
> }
>
> // static
> void ForTestingEnsureGarbageCollected() {
> static bool gc_has_run = false;
>
> v8::Context::Scope scope(v8::Context::New());
> v8::HandleScope handle_scope;
>
> // Create a dummy object that will be destroyed for sure when the GC runs
> v8::Persistent<v8::Object> weakref;
> {
> v8::HandleScope handle_scope;
> v8::Handle<v8::Object> dummy_ob(v8::Object::New());
> weakref = v8::Persistent<v8::Object>::New(dummy_ob);
> gc_has_run = false;
> weakref.MakeWeak(&gc_has_run, &OnGarbageCollected);
> }
>
> static const int kMemoryIncrement = 0x10000;
> int adjustment = 0;
> while (!gc_has_run) {
> // via http://create.tpsitulsa.com/wiki/V8/Garbage_Collection
> v8::V8::AdjustAmountOfExternalAllocatedMemory(kMemoryIncrement);
> adjustment += kMemoryIncrement;
>
> v8::HandleScope handle_scope;
> v8::Handle<v8::Object> dummy_ob(v8::Object::New());
> }
> v8::V8::AdjustAmountOfExternalAllocatedMemory(adjustment * -1);
> }
>
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>
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