TMF Management Programming Manual (G06.24+)

Introduction to TMF

HP NonStop TMF Management Programming Manual—522420-002

1-9

Operating System Procedure Calls

For more information about these statements, see the Pathway SCREEN COBOL

Reference Manual.

Table 1-4 lists the SCREEN COBOL language registers that manage transactions

programmatically.

For more information about these registers, see the Pathway SCREEN COBOL

Reference Manual.

Operating System Procedure Calls

Through its Guardian application program interface (API), the NonStop Kernel

operating system provides procedure calls you can include in application programs

written in any of the following languages: C, C++, COBOL, FORTRAN, Pascal, and

the native Transaction Application Language (TAL). In most cases, the code for the

procedures is made available through external declaration files provided with the

compiler.

Through the procedure calls, you can request many system services. Table 1-5 lists a

few of the calls that you can apply to TMF transactions.

Table 1-3. Pathway SCREEN COBOL Statements

Statement Description

ABORT-TRANSACTION Cancels the transaction of a terminal operating in transaction

mode. All database updates made to audited files during the

transaction are backed out and no attempt is made to restart

the transaction.

BEGIN-TRANSACTION Marks the beginning of a series of operations that are to be

treated as a single transaction. When this statement

executes, the terminal enters transaction mode.

END-TRANSACTION Marks the completion of a sequence of operations that are

treated as a single transaction. When this statement

executes, the terminal leaves transaction mode.

RESTART-TRANSACTION Is equivalent to an ABORT-TRANSACTION statement

followed by a BEGIN-TRANSACTION statement.

Table 1-4. Pathway SCREEN COBOL Registers

RESTART-COUNTER Contains the number of times a transaction has been restarted

during transaction mode.

TERMINATION-STATUS Communicates an error number, further describing the error.

TRANSACTION-ID Contains the value of the transaction identifier that the TMF

subsystem assigns when the SCREEN COBOL BEGIN-

TRANSACTION statement executes.