Informix 7.2 and Threads: Error -439

Hello everyone I want to know if I can have multi-threaded clients accessing an Informix 7.2 database. I have two threads in my application and when both of them access the db using ESQL statements (preparing and fetching cursors etc), I get the a -439 error code. finderr -439 -439 Database server is currently processing an SQL task. You attempted to call an SQL routine or attempted to execute an SQL statement within a signal handling function/routine or a callback function/procedure. Use only the sqldone() and sqlbreak() library functions inside your INFORMIX-ESQL/C callback function. Use only the ECO-SQD and ECO-SQB library routines inside your ESQL/COBOL callback procedure. In addition, if you want to unregister your callback function in INFORMIX-ESQL/C, you can invoke the sqlbreakcallback() callback registration function within your callback procedure. If you want to unregister your callback procedure in ESQL/COBOL, you can invoke the ECO-SQBCB callback registration routine within your callback procedure. I am using only one database connection for both threads. Should I open separate connections and execute the ESQL commands? Will that solve my problem or should I synchronize the db access so that only one thread accesses it at any time? Both threads only read the db, and do not modify or delete anything. I am running Informix 7.2 on Solaris 2.51 Hope someone can help. Supriya Madhuram