gistfile1.txt

   public function updateproductstock(array $productData) {
        foreach ($productData as $productId => $data) {
            $productId = (int) $productId;
            $isInStock = $data['is_in_stock'];
            $manageStock = $data['manage_stock'];
            $qty = $data['qty'];
            $configManageStock = $data['config_manage_stock'];
            $this->updateOneProductStock($productId, $isInStock, $manageStock, $qty, $configManageStock);
        }
       // $process = Mage::getModel('index/indexer')->getProcessByCode('cataloginventory_stock');
       // $process->reindexAll();

    }

    public function updateOneProductStock($productId, $isInStock, $manageStock, $qty, $configManageStock) {
        $stockItem = Mage::getModel('cataloginventory/stock_item')->loadByProduct($productId);

        if ($stockItem && !$stockItem->getProductId()) {
            $stockItem->setData('product_id', $productId);
            $stockItem->setData('stock_id', 1);
        }

        if (!stockItem) {
            return;
        }


      //  $stockItem->setData('product_id', $productId);
        $stockItem->setData('qty', $qty);
      //  $stockItem->setData('store_id', 1);
       // $stockItem->setData('stock_id', 1);
        $stockItem->setData('is_in_stock', $isInStock);
        $stockItem->setData('manage_stock', $manageStock);
        $stockItem->setData('use_config_manage_stock', $configManageStock);
        $stockItem->save();

    }