Hello everyone,
I've been embedding the V8 engine into FreeSWITCH, to be able to use
JavaScript within FreeSWITCH. I'm more or less finished, but I have found a
strange thing with weak callbacks. I do handle the cleanup now anyway,
since I store the C++ instances in a separate list which cleans up
everything still alive after JS exectution - but I would still like to
understand why this happens.
Consider the following code example in JS;
---
var test = new DB();
function callback(dataRow) {
// Do something
}
test.exec('SELECT * FROM test', callback);
---
In this case CoreDB is a class that I've implemented, and the C++ instance
for this class has a weak callback that should happen when the object
("test") is GC'd.
The callback function is stored in the C++ instance as a
Persistent<Function>.
If I do a Persistent<Function>.Reset after I've used the callback, the weak
callback will happen, but if the persistent function is still "alive", it
will never happen.
After execution I force GC to run, so I know the object should be cleaned.
I just don't understand why the GC won't cleanup an object because it
internally holds a reference to the JS function "callback". If something
within that JS function would reference the object "test" I would at least
understand why, but in this case I see no reason.
I've also tried storing the function as a "Function *func" inside the C++
instance - this actuelly does work properly, but I'm not sure if I always
can asume that this reference will be valid during the entire JS execution?
/Peter
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