Fix the problem that could be caused by communication

Signed-off-by: huangdada <huangdada@huangdada-PC>
Signed-off-by: huangdada <huangdada@huangdada-PC>
2014-03-24

Signed-off-by: huangdada <huangdada@huangdada-PC>
Signed-off-by: huangdada <huangdada@huangdada-PC>