node: ensure same AL inst only runs once

It was possible that the same AL instance was run twice if it were both
attached to the currentContext then again added to the new asyncQueue
generated for the new stack.

Signed-off-by: Timothy J Fontaine <tjfontaine@gmail.com>

src/node.js

@@ -366,11 +366,14 @@
         }
       }
 
-
       // Then run through all items in the asyncQueue
       if (asyncQueue) {
         for (i = 0; i < asyncQueue.length; i++) {
           queueItem = asyncQueue[i];
+          // Quick way to check if an AL instance with the same uid was
+          // already run from currentContext.
+          if (data[queueItem.uid] !== undefined)
+            continue;
           queue[queue.length] = queueItem;
           context._asyncFlags |= queueItem.flags;
           if ((queueItem.flags & HAS_CREATE_AL) === 0) {
@@ -519,12 +522,13 @@
       }
 
       this.uid = ++alUid;
-      this.data = data;
+      this.data = data === undefined ? null : data;
     }
     AsyncListenerInst.prototype.create = undefined;
     AsyncListenerInst.prototype.before = undefined;
     AsyncListenerInst.prototype.after = undefined;
     AsyncListenerInst.prototype.error = undefined;
+    AsyncListenerInst.prototype.data = undefined;
     AsyncListenerInst.prototype.uid = 0;
     AsyncListenerInst.prototype.flags = 0;
 

test/simple/test-asynclistener-run-inst-once.js

@@ -0,0 +1,45 @@
+// 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');
+
+var cntr = 0;
+var al = process.createAsyncListener({
+  create: function() { cntr++; },
+});
+
+process.on('exit', function() {
+  assert.equal(cntr, 4);
+  console.log('ok');
+});
+
+process.addAsyncListener(al);
+
+process.nextTick(function() {
+  process.addAsyncListener(al);
+  process.nextTick(function() {
+    process.addAsyncListener(al);
+    process.nextTick(function() {
+      process.nextTick(function() { });
+    });
+  });
+});