obj-gc-test-fail.js

// run with "node --expose_gc"

var weak = require('weak')
  , util = require('util')

var count = 0
  , countGc = 0

function dec () {
  count--
}
function decGC () {
  countGc--
}

function test () {
  function MyObject () {
    var self = this;
    Object.defineProperty(this, 'color', {
      get: function() { return 'red' }
    })
    setTimeout(function () { 
      self.emit('close')
    }, 2000)
  }

  util.inherits(MyObject, process.EventEmitter)

  for (var i = 0; i < 1000; i++) {
    var o = new MyObject()
    count++
    o.on('close', dec)
    countGc++
    weak(o, decGC)
  }
}
test()

setInterval(function () {
  gc()
  console.log('objects: %d, garbage collected: %d', count, countGc)
}, 1000)

output-fail.txt

objects: 1000, garbage collected: 1000
objects: 1000, garbage collected: 1000
objects: 0, garbage collected: 12
objects: 0, garbage collected: 12
objects: 0, garbage collected: 12
objects: 0, garbage collected: 12
objects: 0, garbage collected: 12
objects: 0, garbage collected: 12
objects: 0, garbage collected: 12
objects: 0, garbage collected: 12
...