Interprocess Communication: Programmer's Guide: HP 3000 MPE/iX Computer Systems

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HP Part Number: 32650-90019

Edition: Edition 1

Published: Printed in U.S.A. November 1987

Table of Contents

1 What is Interprocess Communication?

Purposes of IPC
Ways to Perform IPC

2 IPC Using Job Control Words and Other Variables

Types of Variables

Relationship of JCWs and Variables

Variable Intrinsics

HPCIPUTVAR
HPCIGETVAR
HPCIDELETEVAR

Variable Commands

:SETVAR
:SHOWVAR
:DELETEVAR

Job Control Words

Using the Predefined JCW for Interprocess Communication
Using User-Defined JCWs for Interprocess Communication

Job Control Word Intrinsics

SETJCW
PUTJCW
FINDJCW

Job Control Word Commands

:SETJCW
:SHOWJCW

Special Considerations

Displaying JCWs and Variables
Warning Messages

Additional Discussion

3 IPC Using File System Intrinsics

Characteristics

Creating a Message File

How To Use IPC--A Simple Case

Program Structure
Message File Names
IPC Processing
End-of-File (EOF) Conditions
Recovery From Abnormal Terminations
Sample Programs

4 Special Cases of IPC

Multiple Concurrent Readers or Writers
Preventing Deadlocks
Writer Identification
Extended Wait
Timeouts
Nondestructive Reads
Forcing Records To Disc

5 NOWAIT I/O

NOWAIT I/O Intrinsics
Aborting NOWAIT I/O
Limitations
Examples

6 Software Interrupts

Example—Use of Software Interrupts
Software Interrupt Intrinsics
Software Interrupt Initialization
Interrupt Handler
Main Line Code
Disarming Software Interrupts
Restrictions
Sample Program--Use of Software Interrupts

7 Interprocess Communication Via the MAIL Facility

Restrictions
Definition of Mail
Mail Transfer Process
Testing Mailbox Status
Sending Mail
Receiving (Collecting) Mail
Avoiding Deadlocks

A Features of Intrinsics for Message Files

Intrinsics Not Allowed for Message Files

Intrinsics Exclusive to IPC

A Note On Syntax

HPFOPEN
FCONTROL
FCHECK
FGETINFO
FFILEINFO

B Sample Programs: WAIT I/O

C Sample Programs: NOWAIT I/O

D Sample Programs: Software Interrupts

SPL Examples
Pascal Examples

List of Figures

3-1 IPC Processing


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