Timer's unref unreliable when http module required after using them #1151
Description
Finally narrowed this down to a (admittedly bizarre) test case -- still looking into exactly why it happens -- but generally there appears to be a race condition or off-by-one in the timer unref management if the unref is called and then later the http module is required:
setImmediate(function () {
require("http")
})
var i = setInterval(function () {
setImmediate(process.exit)
}, 10)
i.unref()
process.on("exit", logstuff)
function logstuff() {
console.log(process._getActiveHandles())
}
With 0.10 or 0.12 this logs [] which is expected because the interval was unreferenced.
In io.js you get:
[ { '0': [Function: listOnTimeout],
_idleNext:
{ _idleTimeout: 10,
_idlePrev: [Circular],
_idleNext: [Circular],
_idleStart: 1218064360,
_onTimeout: [Function: wrapper],
_repeat: true,
_handle: [Object] },
_idlePrev:
{ _idleTimeout: 10,
_idlePrev: [Circular],
_idleNext: [Circular],
_idleStart: 1218064360,
_onTimeout: [Function: wrapper],
_repeat: true,
_handle: [Object] },
msecs: 10 } ]
Which is showing the unreferenced timer.
I found this when my application was supposed to be shutting down but was being kept alive by an unreferenced setInterval timer.