Transient data program exits (XTDREQ, XTDIN, XTDOUT)

The XTDREQ exit intercepts a transient data request before request analysis. The XTDOUT and XTDIN exits are invoked before and after data is exchanged with QSAM or VSAM.

The CICS® transient data facility is threadsafe, so CICS can process transient data requests on an open TCB. Transient data requests are also threadsafe when you function ship them to a remote region over an IPIC connection. To optimize TCB switching and gain the performance benefits of the open transaction environment, programs running at XTDREQ, XTDIN, and XTDOUT must be coded to threadsafe standards and defined to CICS as threadsafe.