Merge pull request #507 from 140proof/master

Make sure pool requests always behave asynchronously

Author: felixge

lib/Pool.js

@@ -19,15 +19,19 @@ function Pool(options) {
 
 Pool.prototype.getConnection = function (cb) {
   if (this._closed) {
-    return cb(new Error('Pool is closed.'));
+    return process.nextTick(function(){
+      return cb(new Error('Pool is closed.'));
+    });
   }
 
   var connection;
 
   if (this._freeConnections.length > 0) {
     connection = this._freeConnections.shift();
 
-    return cb(null, connection);
+    return process.nextTick(function(){
+      return cb(null, connection);
+    });
   }
 
   if (this.config.connectionLimit === 0 || this._allConnections.length < this.config.connectionLimit) {
@@ -49,7 +53,9 @@ Pool.prototype.getConnection = function (cb) {
   }
 
   if (!this.config.waitForConnections) {
-    return cb(new Error('No connections available.'));
+    return process.nextTick(function(){
+      return cb(new Error('No connections available.'));
+    });
   }
 
   if (this.config.queueLimit && this._connectionQueue.length >= this.config.queueLimit) {