C compiler pragmas

Compiler Pragmas:

Compiler pragmas enable you to control various elements of compiler listings, code generation, and building of the object file.

Pragma	Description
ENV	Specifies the intended run-time environment of an object file.
ERRORFILE	Directs Errors and warnings to specified file
ERRORs	Directs compiler to terminate compilation if detects more than specified errors.
EXTENSIONS	Allow source code to use syntax extensions and standard library extensions by HP
HIGHPIN	Specifies that object file should run in HIGHPIN(>=256).
INSPECT	Symbolic debugger is default debugger
NOINSPECT	Systems default debugger is default debugger
RUNNABLE	Directs the compiler to generate executable object instead of linkable
RUNNAMED
SAVEABEND	Controls whether system generates saveabend or not
SYMBOLS	Controls the inclusion of symbols information in the object file.
WIDE	Specifies the data model, which defines the size of the data type int.
XMEM	Controls which memory model should be used large or small by the object.
NOXMEM	Small memory model.

C Memory Model

DEFINES

DEFINE CLASSES
CATALOG	SQL Catalog will be replaced with DEFINE
	ADD DEFINE =JUNE^RECORDS, CLASS MAP, FILE \ACCT.$DISK.RECORDS.JUNE
DEFAULTS	Defaults like VOL, SUBVOL will be replaced with DEFINE
MAP	FILE will be replaced with DEFINE name
SPOOL	Attribute of SPOOLER job, such as location and number of copies
	ADD DEFINE =SPOOLER^JOB, CLASS SPOOL, COPIES 2, LOC $S.#HOLD
ENABLING/DISABLING DEFINES
Enabling	DEFMODE ON
Disabling	DEFMODE OFF

TEDIT BASIC Commands

F1	RECONF  O		Allow to change the options like search options
	RECONF  F		Allow to change the options of functions
F12			Searching options window will be prompted
	Search for:    In lines: F/L  In columns: 1:239     Options: i  When found:
F11	+++++++++++++++		Search forward
	SHIFT+F11		search backword
F1	MARK  X		Book mark the locations
	GOTO X		Goto bookmark
F1	SH ON		Display line numbers
	SH OFF		LINE NUMBERS OFF
	DI  X		Xth Line will be displayed
	BR		Break line
	OPEN 2		OPEN 2nd file

Context and Context Free Servers

Context free servers/Services: Servers(Services) that don't save the information about previous request is referred as Context free servers.

Servers that save the information about previous request as a reference for a subsequent request are called Context Servers.

Various components of Pathway subsystem

Process: Any running program is called process. Each time a program is executed, operating system creates a process. If two different programs are executed, 2 processes will be created. If single program is executed by two different users concurrently, OS will create 2 processes.

PATHMON: is a Pathway monitoring process. It supervises all the processes in the pathway environment. Only one PATHMON process will be there for any Pathway.

PATHCOM: is a command line interface, which allow system operators to communicates with PATHMON to control the processes.

SCREEN COBOL Library: Contains the requesters programs after they are compiled by SCOBOLX compiler, which means all the requester screens objects will be present in SCL.

TCP(Terminal Control Process):
 

What is IPCs??

IPCs -- Inter Process Communication messages commonly known as IPCs. Requesters and Servers communicate each other through IPCs.

There are 2 types of IPCs messages:
1. Request 2. Reply

Request Messages:

Request Messages are sent from a Requester and received by particular Service of the SERVER.

Commonly Request messages are initiated from SCREEN COBOL with SEND statement. Pathway then routes the request to a server containing the service. Server then reads the message using special file $RECEIVE.

Reply Messages:

Reply messages are formatted by SERVICE and sent back to the requester after the service is completed. Reply message is written to $RECEIVE and pathway routes this information to requester.

Reply message contains the requested information if the service is successful or error message if the service is not successful.

Source: HP PathMaker Manual