Can a socket be closed from a thread other than it orignated from   

When I try to create a socket from a thread, the IP_ADD_MEMBERSHIP is success.
When I try to close the socket from a different thread , I get a result 
IP_DROP_MEMBERSHIP failed.

Is it because the socket that was created from a thread, cannot be deleted 
from a different thread.

date: Thu, 3 Jul 2008 23:53:03 -0700   author:   Rocky