about ice_oneway call

Code like this
...
Ice::ObjectPrx obj = m_communicator->stringToProxy(_proxy);

Gradual::UserManagerPrx mproxy=0;

mproxy = Gradual::UserManagerPrx::checkedCast(obj);

Gradual::UserManagerPrx oneway = Gradual::UserManagerPrx::uncheckedCast(mproxy->ice_oneway());


try
{

oneway->DoSomething(...);
>>>>>>>>>>
waiting for long time ,like without end
>>>>>>>>>>>>>

}
catch(const Ice::Exception& ex)

{
}

...

I'm afraid we need a much more detailed description of the problem. What is the operating system? What is Ice version? What is the protocol and network tracing output? Do you have an example that demonstrates the problem?