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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
DataBlade® API Programmer's GuideThe Informix® DataBlade® API Programmer's Guide describes information about the DataBlade® API, the C-language application programming interface (API) provided with HCL Informix®.
Create user-defined routines
Write a user-defined routineThis section outlines some implementation issues for C user-defined routines (UDRs). This section also describes the specific features and tasks of a C UDR.
Control the VP environmentThe routine manager executes your C UDR in a virtual-processor (VP) environment.
Lock a UDR

Lock a UDR

If the UDR determines that its VP environment is correct and needs to remain as it is, the UDR can perform either of the following tasks.


Lock UDR	DataBlade® API function
Lock the UDR to the current VP	mi_udr_lock()
Lock the shared-object file that contains the UDR into memory	mi_module_lock()

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