HP TACL User Manual

Using $RECEIVE
Initiating and Communicating With Processes
5–22 107365 Tandem Computers Incorporated
For nowaited communication, TACL sends the WRITEREAD and continues
executing code. Each time you append a line to prompt_var, the TACL process
reads a record from $T1 and appends it to read_var. To open a running process
and specify nowaited communication, issue a #REQUESTER READ call without
the WAIT option. The following statement opens $T1 for nowaited I/O:
#REQUESTER READ $T1 error_var read_var prompt_var
To wait for completion of the read operation, and when you are finished writing to
the process, use the #WAIT built-in function to wait until read_var contains
data. To avoid writing over data that has not yet been transmitted, use #WAIT to
make sure the previous operation has finished.
Sending Messages to a Process
The following examples show how to use #REQUESTER to communicate with
processes.
Use the routine in Figure 5-10, send, to open a terminal and write a message to line 25
of the terminal. The syntax is:
send device-id text
The #OUTPUT statements output_help_text in this example do not follow the
indentation style guidelines in Section 1, “An Overview of TACL.” This modification
avoids extra spaces in the display.
Figure 5-10. Sending Messages to a Terminal (Page 1 of 3)
?SECTION send ROUTINE
[#CASE [#EXCEPTION]
|_CALL| == code to execute when first entering the routine
#FRAME
[#PUSH error_message,
destination_name,
message,
temp_message,
error,
send_message,
req_status,
output_time,
origin_time,
origin_time_hh,
origin_time_mm]
|_ERROR| == code to execute when an _ERROR is detected
#ERRORTEXT /CAPTURE error_message/
#OUTPUT Send Terminated - Error: [error_message]
#UNFRAME
#RETURN

HP TACL Specifications

General

Name	HP TACL
Purpose	Task automation, system management, and application control
Category	Software
Platform	HP NonStop
Type	Scripting language
Developer	Hewlett-Packard

Summary

Section 1 An Overview of TACL

Running the Examples in This Manual

Instructions for executing manual examples, including setting required variables.

About This Manual

Section 2 Developing TACL Programs

Processing Character Data

Covers tasks like constructing text strings, analyzing output, and manipulating characters.

Debugging TACL Programs

Introduces the TACL debugger for step-by-step execution and variable examination.

Section 3 Developing TACL Routines

Processing Arguments

Details how routines handle arguments using #ARGUMENT, including options and alternatives.

Writing an Exception Handler

Explains handling events like BREAK keys or TACL errors using exception handlers.

4 Accessing Files

#REQUESTER Operation

Describes the #REQUESTER function for opening files and initiating I/O operations.

Requesting Waited Reads

Explains opening files for waited read operations using #REQUESTER.

5 Initiating and Communicating With Processes

Initiating a Process: RUN and #NEWPROCESS

Covers starting processes using RUN and #NEWPROCESS, including startup options.

Using the INLINE Facility

Using INV and OUTV

Using $RECEIVE

Using #SERVER

6 Running TACL as a Server

Running a TACL Process as a Server

Explains making a TACL process a server by establishing its IN file as $RECEIVE.

Running TACL Code as a Server

Details providing TACL code for a TACL-server process using #INPUTV and #REPLYV.

Using TACL as a Pathway Server

Describes creating a Pathway environment with TCP and TACL servers to process requests.

7 Using Programmatic Interfaces

Overview of SPI and EMS

Using SPI

Using EMS

8 Example of a System Management Program

Monitoring System Operation