RPC client structure concurrent use

Question

What happens if a RCP structure obtained by calling clnt_create() is used by several threads versus a remote client?

For example... clnt_create() => A: RCP Client structure Thread 1 => Use A and call service_1() versus client 1; Thread 2 => Use A and call service_2() versus client 1;

Sometimes thread 2 will use A when thread 1 is still using it and viceversa. Concurrent use of A is a potential problem or not?

Thanks to all.