improved for create scheduler

src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java

@@ -240,7 +240,7 @@ public abstract class DruidAbstractDataSource extends WrapperAdapter implements
     protected DruidDataSourceStatLogger                statLogger                                = new DruidDataSourceStatLoggerImpl();
     
     private boolean                                    asyncCloseConnectionEnable                = false;
-    protected int                                      maxCreateTaskCount                        = 2;
+    protected int                                      maxCreateTaskCount                        = 3;
     protected ScheduledExecutorService                 destroyScheduler;
     protected ScheduledExecutorService                 createScheduler;
 

src/main/java/com/alibaba/druid/pool/DruidDataSource.java

@@ -1762,14 +1762,13 @@ public class DruidDataSource extends DruidAbstractDataSource
 
         @Override
         public void run() {
+            runInternal();
+        }
+      
+        private void runInternal() {
             for (;;) {
                 // addLast
-                try {
-                    lock.lockInterruptibly();
-                } catch (InterruptedException e2) {
-                    break;
-                }
-
+                lock.lock();
                 try {
                     // 必须存在线程等待，才创建连接
                     if (poolingCount >= notEmptyWaitThreadCount) {