GDSX (Extended General Device Support) Manual

Service Routines

Extended General Device Support (GDSX) Manual—529931-001

8-48

^LOCKREC

•

For an intertask message (itc-flag is a nonzero value) the IOCB is as follows:

If the operation is a CONTROL:

If the operation is a SETMODE:

If the operation is a WRITE, READ, or WRITEREAD:

^LOCKREC

This procedure excludes other external openers from accessing a record at the current

position.

The syntax, condition code settings, and considerations regarding this procedure are

the same as the counterpart in the Guardian Procedure Calls Reference Manual.

MAKE_PROCESS_HANDLE_NULL_

This procedure creates a null process handle.

iocb.state 6 = I/O active

iocb.optype Type of operation:

1 = CONTROL

2 = SETMODE

3 = WRITE

4 = READ

5 = WRITEREAD

iocb.histag DEVICE^HANDLER’s nowait tag

iocb.tcbaddr Address of DEVICE^HANDLER’s TCB

iocb.file User task’s pseudo-file number

iocb.openid Open ID assigned by USER^START

iocb.control^op CONTROL operation (operation)

iocb.control^param Value of operation (param)

iocb.setmode^funct SETMODE function (function)

iocb.setmode^p1 SETMODE parameter (param1)

iocb.setmode^p2 SETMODE parameter (param2)

iocb.iocnt Write count if WRITE or WRITEREAD

iocb.cnt Read count if READ or WRITEREAD

iocb.bufaddr[x] Address of DEVICE^HANDLER’s buffer

CALL MAKE_PROCESS_HANDLE_NULL_ ( processhandle ); !