Behavior of Routines

While Informix recommends that all new routines be defined as poorly behaved, for the purposes of this tutorial, you should check well behaved in the New Routine wizard.

Well behaved. A routine is well-behaved if it:

• yields the CPU on a regular basis to other threads.
• does not use blocking operating-system calls.
• does not allocate local resources.
• does not modify the global virtual processor state.

Poorly behaved. If you have a poorly behaved routine, you should check poorly behaved and type the name of a user-defined virtual processor in the user-defined virtual processor class field. If you let a poorly behaved routine run in the CPU virtual processor, you could experience potentially severe performance problems. You must create the extension virtual processor before you register the DataBlade module containing routines that run in it.

See the Administrator's Guide for your database server for more information about creating and configuring a user-defined virtual processor.