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timers: assure setTimeout callback only runs once #1231

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timers: assure setTimeout callback only runs once #1231

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951168f
timers: assure setTimeout callback only runs once
silverwind Mar 21, 2015
bc94f6c
Add _called to prototype
silverwind Mar 25, 2015
a58d149
Add test for unref during setInterval
silverwind Mar 25, 2015
c99318c
Let timer unenroll and prevent setInterval issues
silverwind Mar 25, 2015
1a824b1
Add note to setInterval test
silverwind Mar 25, 2015
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5 changes: 5 additions & 0 deletions lib/timers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,7 @@ function listOnTimeout() {
if (domain)
domain.enter();
threw = true;
first._called = true;
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Please add this._called = false to the constructor.

first._onTimeout();
if (domain)
domain.exit();
Expand Down Expand Up @@ -305,6 +306,9 @@ Timeout.prototype.unref = function() {
if (this._handle) {
this._handle.unref();
} else if (typeof(this._onTimeout) === 'function') {
// Prevent running callback multiple times
// when unref() is called during the callback
if (this._called) return;
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I think it's probably best to just do this before if (this._handle) {, but I'm not 100% sure it matters.

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Yes, I was unsure here too, but since I only wanted to prevent the _onTimeout call, this seemed right.

var now = Timer.now();
if (!this._idleStart) this._idleStart = now;
var delay = this._idleStart + this._idleTimeout - now;
Expand Down Expand Up @@ -492,6 +496,7 @@ function unrefTimeout() {
if (domain) domain.enter();
threw = true;
debug('unreftimer firing timeout');
first._called = true;
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Strictly, this one wasn't neccessary to fix the issue, but I thought it's better to track all callback calls if there are more edge cases.

first._onTimeout();
threw = false;
if (domain)
Expand Down
7 changes: 7 additions & 0 deletions test/parallel/test-timers-unref.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ var interval_fired = false,
timeout_fired = false,
unref_interval = false,
unref_timer = false,
unref_callbacks = 0,
interval, check_unref, checks = 0;

var LONG_TIME = 10 * 1000;
Expand Down Expand Up @@ -34,6 +35,11 @@ check_unref = setInterval(function() {
checks += 1;
}, 100);

setTimeout(function() {
unref_callbacks++;
this.unref();
}, SHORT_TIME);

// Should not assert on args.Holder()->InternalFieldCount() > 0. See #4261.
(function() {
var t = setInterval(function() {}, 1);
Expand All @@ -46,4 +52,5 @@ process.on('exit', function() {
assert.strictEqual(timeout_fired, false, 'Timeout should not fire');
assert.strictEqual(unref_timer, true, 'An unrefd timeout should still fire');
assert.strictEqual(unref_interval, true, 'An unrefd interval should still fire');
assert.strictEqual(unref_callbacks, 1, 'Callback should only run once');
});