I'm trying to use V8::AddMemoryAllocationCallback
<http://izs.me/v8-docs/classv8_1_1V8.html#ac9718f8dc3f3c498bf07282eb7c1618e>
method
for a NodeJS C++ Addon. I want to call to that method and return that size
value. I came up with following code. Seems to be it's not calling to
callback method. The code is taken form goingnative
<https://github.com/workshopper/goingnative/tree/master/exercises/call_me_maybe/solution>
npm
module.
But the memCallback method didn't get trigger. Why? How to fix it?
It'll use the following C++ code to access V8 library.
//myaddon.cc#include <nan.h># include <unistd.h>#include <iostream>#include
<fstream>
using namespace std;using namespace v8;
static int x = 0;static int y = 0;
void memCallback(ObjectSpace space, AllocationAction action, int size) {
ofstream myfile;
myfile.open ("/tmp/example.txt");
myfile << "Writing this to a file.\n";
myfile.close();
x = size;}
NAN_METHOD(Delay) {
NanScope();
int delay = args[0].As<Number>()->IntegerValue();
Local<Function> callback = args[1].As<Function>();
V8::AddMemoryAllocationCallback(&memCallback, kObjectSpaceNewSpace,
kAllocationActionAllocate);
for(int i = 0; i < 10; i++) {
y = i;
Local<Value> argv[] = {NanNew(x), NanNew(y)};
NanMakeCallback(NanGetCurrentContext()->Global(), callback, 2, argv);
usleep(delay * 1000);
}
NanReturnUndefined();}
void Init(Handle<Object> exports) {
exports->Set(NanNew("delay"),
NanNew<FunctionTemplate>(Delay)->GetFunction());}
NODE_MODULE(myaddon, Init)
node-gyp has use to build and run the code (try node-gyp rebuild && node
index.js 1000 && ls /tmp/ from current folder)
//binding.gyp{
"targets": [
{
"target_name": "myaddon",
"sources": [ "myaddon.cc" ],
"include_dirs": [ "<!(node -e \"require('nan')\")" ]
}
]}
Following is the JavaScript code. I have created few variables in order to
allocate some memory.
//index.jsvar addon = require('bindings')('myaddon')
addon.delay(process.argv[2], function(x, y) {
console.log("X: ", x, " Y:", y);
var arr = [], obj = {};
for (var i = 0; i < 100; i++) {
arr.push("Text " + i);
}
for (var i = 0; i < 100; i++) {
obj[i] = arr[i];
delete arr[i];
}
console.log('Done!');})
console.log("The End");
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