TMF Introduction (G06.26+)

HP NonStop TMF Introduction—522414-002

5-1

TMF Application Programming

The TMF application programming interface (API) is accessible through commands in

the following languages: C, C++, HP COBOL, FORTRAN, SQL, SCREEN COBOL,

and TAL.

TMF frees application programmers from the tasks of managing concurrency and

consistency in case of failure. However, those who use TMF must properly define

transactions as they code their application programs.

This section addresses application programming concepts, and includes the following

topics:

Overview of Application Programming

As a TMF application program runs, TMF provides underlying functions that greatly

simplify the programmatic details of transaction processing. The application programs

themselves are typically based on the requester/server model.

TMF Functions in Application Programming

The TMF interface in application programs provides two major functions:

•

Accessing and locking data

All data records that are to be modified must first be locked. The I/O and locking

interface to TMF depends on the programming language used. TMF manages

locks when several applications need concurrent locks on the same data.

•

Controlling transactions

Applications must be able to create, commit, and abort transactions. The particular

transaction control statements also depend on the programming language.

Topic Page

Overview of Application Programming 5-1

Accessing and Locking Data 5-2

Controlling Transactions 5-8

Designing Applications for the Pathway Environment 5-9