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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® Developers KitThe DataBlade® Developers Kit (DBDK) guides contain information about the tools you can use to develop and package DataBlade® modules, which extend the functionality of HCL Informix® databases.
DataBlade® Developers Kit User's GuideThe HCL Informix® DataBlade® Developers Kit User's Guide describes how to use tools to develop and package DataBlade® modules.
Programming DataBlade® module routines in CThis section contains information to help you edit and compile C language source code generated by DataBlade®.
Generated code
Utility functions generated by BladeSmithBladeSmith generates utility functions that it calls from other generated code.
The Gen_IsMMXMachine() utility functionThe Gen_IsMMXMachine() utility function can be used when you include Intel™ MMX media enhancement technology in your DataBlade® module.

The Gen_IsMMXMachine() utility function

The Gen_IsMMXMachine() utility function can be used when you include Intel™ MMX media enhancement technology in your DataBlade® module.

The function tests the processor in the database server computer to determine if it has MMX technology support. If MMX technology support is found, Gen_IsMMXMachine() returns 1.

If the database server machine does not have MMX technology support, or if the FORCE_NO_MMX environment variable is set in the database server environment, Gen_IsMMXMachine() returns 0. On UNIX™ machines, Gen_IsMMXMachine() always returns 0.

To execute MMX instructions when possible and to execute portable C code on computers that do not have MMX technology support, call Gen_IsMMXMachine() in an IF statement.

Gen_IsMMXMachine() declares a static INT flag, MMXType. It first looks for the FORCE_NO_MMX environment variable, which must be set in the environment before the database server is started.

If FORCE_NO_MMX is found, the function sets MMXType to 0 without testing the CPU. If FORCE_NO_MMX is not found, the function tests the processor and sets the MMXType variable to 1 if MMX technology support is found or 0 if not. After the value of MMXType is set, Gen_IsMMXMachine() returns its value immediately, so that tests are performed once after the DataBlade module object file is loaded.

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