GDSX (Extended General Device Support) Manual

DEVICE^HANDLER Example, Running and
Managing
Extended General Device Support (GDSX) Manual—529931-001
4-2
Running an Application Process
Running an Application Process
In the tutorials on both the DEVICE^HANDLER example and the LINE^HANDLER
example in Section 4, DEVICE^HANDLER Example, Running and Managing through
Section 7, LINE^HANDLER Example, Design, a simple unconverted TAL application is
used to send requests to the GDSX process. (FUP may also be used as a requester.)
The following exercise familiarizes you with this application so the requester’s
functioning may later be clearly distinguished from the functioning of the GDSX
process.
Compiling the Requester
The application source file, APPLS, is included in the GDSX installed subvolume. The
terminal to be used for compilation is called the TACL terminal. At the TACL terminal,
log on and, if necessary, use the VOLUME command to change the default subvolume
to the subvolume where you wish to work.
Then compile the application program APPLS, assigning an object file name of APPL:
> TAL /IN $vol.subvol.APPLS, OUT $S.#APPLS/ APPL
When compiling APPLS, you do not set the HIGHPIN object-file attribute on, because
this requester is unconverted and cannot run at a high PIN. A listing of the source file
is included in Appendix A.
Running the Application
The first application terminal is used for input to and output from the requester
application. At this terminal, log on and enter a WHO command to identify the
terminal’s device name. Suppose for this example that it is $TC1. Pause the TACL
process with the PAUSE command. Pausing the TACL process allows the application
process to control the terminal.
At the TACL terminal, start an application process, named $A1 in this example:
> RUN APPL /NAME $A1, OUT $TC1, NOWAIT/
$A1 is designed to open the specified OUT file and send a WRITEREAD to the file.
The application terminal should now show a prompt sent by the application. The
prompt contains the CPU number and PIN of the process. Verify this by entering the
following at the TACL terminal:
> STATUS *, TERM
At the application terminal, type a short text string followed by a carriage return. The
string of characters returned should be exactly those entered, displayed in reverse
order. Enter another text string.
After reading the startup message and opening the OUT file, this simple application
performs the following instructions in a loop:
1. Issue a waited WRITEREAD “CPU, PIN” prompt to the file.