timers: remember extra setTimeout() arguments when timeout==0

Fixes #2079.

lib/timers.js

@@ -144,19 +144,23 @@ exports.active = function(item) {
 
 
 exports.setTimeout = function(callback, after) {
-  var timer, c, args;
+  var timer;
 
   if (after <= 0) {
     // Use the slow case for after == 0
     timer = new Timer();
-    timer.ontimeout = callback;
 
-    args = Array.prototype.slice.call(arguments, 2);
-    timer._onTimeout = function() {
-      callback.apply(timer, args);
-      timer.close();
+    if (arguments.length <= 2) {
+      timer._onTimeout = callback;
+    } else {
+      var args = Array.prototype.slice.call(arguments, 2);
+      timer._onTimeout = function() {
+        callback.apply(timer, args);
+        timer.close();
+      }
     }
 
+    timer.ontimeout = timer._onTimeout;
     timer.start(0, 0);
   } else {
     timer = { _idleTimeout: after };
@@ -166,16 +170,7 @@ exports.setTimeout = function(callback, after) {
     if (arguments.length <= 2) {
       timer._onTimeout = callback;
     } else {
-      /*
-       * Sometimes setTimeout is called with arguments, EG
-       *
-       *   setTimeout(callback, 2000, "hello", "world")
-       *
-       * If that's the case we need to call the callback with
-       * those args. The overhead of an extra closure is not
-       * desired in the normal case.
-       */
-      args = Array.prototype.slice.call(arguments, 2);
+      var args = Array.prototype.slice.call(arguments, 2);
       timer._onTimeout = function() {
         callback.apply(timer, args);
       }

test/simple/test-timers-zero-timeout.js

@@ -0,0 +1,58 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common');
+var assert = require('assert');
+
+// https://github.com/joyent/node/issues/2079 - zero timeout drops extra args
+(function() {
+  var ncalled = 0;
+
+  setTimeout(f, 0, 'foo', 'bar', 'baz');
+
+  function f(a, b, c) {
+    assert.equal(a, 'foo');
+    assert.equal(b, 'bar');
+    assert.equal(c, 'baz');
+    ncalled++;
+  }
+
+  process.on('exit', function() {
+    assert.equal(ncalled, 1);
+  });
+})();
+
+(function() {
+  var ncalled = 0;
+
+  var iv = setInterval(f, 0, 'foo', 'bar', 'baz');
+
+  function f(a, b, c) {
+    assert.equal(a, 'foo');
+    assert.equal(b, 'bar');
+    assert.equal(c, 'baz');
+    if (++ncalled == 3) clearTimeout(iv);
+  }
+
+  process.on('exit', function() {
+    assert.equal(ncalled, 3);
+  });
+})();