IS ODBC MySQL connection multitreaded?

Hi, I am running Asterisk 11.9.0 under centos 6.5 (32 bits os). I wrote a small odbc application interfacing to MySQL that sends and receives SMS messages through a gateway box (GoIP) by hypertone. I am trying to determine the volume of messages the system can handle both incoming and outgoing and I seem to be losing incoming messages. My questions is whether odbc is muti-treaded or not or if I have to specify any parameters in odbc.ini, odbcinst.ini or res_odbc.conf to make it multi-treaded. Thanks in advance for any assistance.