修复连接池gc导致的，多个协程读写同一个连接问题

src/Pool/BaseAsyncPool.php

@@ -179,9 +179,8 @@ abstract class BaseAsyncPool extends BasePool
     protected function buildQueue()
     {
         // 清空队列
-        $count = $this->getFree();
         $queue = $this->queue;
-        for ($i = 0; $i < $count; ++$i)
+        while (!$queue->isEmpty())
         {
             $queue->pop();
         }
@@ -190,7 +189,10 @@ abstract class BaseAsyncPool extends BasePool
             // 重新建立队列
             foreach ($this->pool as $item)
             {
-                $queue->push($item);
+                if ($item->isFree())
+                {
+                    $queue->push($item);
+                }
             }
         }
     }

src/Pool/BasePool.php

@@ -172,8 +172,8 @@ abstract class BasePool implements IPool
         $pool = &$this->pool;
         if (isset($pool[$hash]))
         {
-            $pool[$hash]->release();
             $resource->reset();
+            $pool[$hash]->release();
             $this->push($resource);
         }
     }