National foreword

This British Standard reproduces verbatim ISO/IEC 9496:2003 and implements it as the UK national standard. It supersedes BS ISO/IEC 9496:1995 which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee IST/5, Programming languages, their environment and system software interfaces, which has the responsibility to:

aid enquirers to understand the text;
present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;
monitor related international and European developments and promulgate them in the UK.

A list of organizations represented on this committee can be obtained on request to its secretary.

Cross-references

The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard does not of itself confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 13 April 2004

Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the technical committee are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO/IEC 9496 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 22, Programming languages, their environments and system software interfaces, in collaboration with ITU-T. The identical text is published as ITU-T Rec. Z.200.

This fourth edition cancels and replaces the third edition (ISO/IEC 9496:1998), which has been technically revised.

CHILL — THE ITU-T PROGRAMMING LANGUAGE

1.1 General

1.2 Language survey

1.3 Modes and classes

1.4 Locations and their accesses

1.5 Values and their operations

1.6 Actions

1.7 Input and output

1.8 Exception handling

1.9 Time supervision

1.10 Program structure

1.11 Concurrent execution

1.12 General semantic properties

1.13 Implementation options

2 Preliminaries

2.1 The metalanguage

2.2 Vocabulary

2.3 The use of spaces

2.4 Comments

2.5 Format effectors

2.6 Compiler directives

2.7 Names and their defining occurrences

3 Modes and classes

3.1 General

3.2 Mode definitions

3.3 Mode classification

3.4 Discrete modes

3.5 Real modes

3.6 Powerset modes

3.7 Reference modes

3.8 Procedure modes

3.9 Instance modes

3.10 Synchronization modes

3.11 Input-Output Modes

3.12 Timing modes

3.13 Composite modes

3.14 Dynamic modes

3.15 Moreta Modes

4 Locations and their accesses

4.1 Declarations

4.2 Locations

5 Values and their operations

5.1 Synonym definitions

5.2 Primitive value

5.3 Values and expressions

6 Actions

6.1 General

6.2 Assignment action

6.3 If action

6.4 Case action

6.5 Do action

6.6 Exit action

6.7 Call action

6.8 Result and return action

6.9 Goto action

6.10 Assert action

6.11 Empty action

6.12 Cause action

6.13 Start action

6.14 Stop action

6.15 Continue action

6.16 Delay action

6.17 Delay case action

6.18 Send action

6.19 Receive case action

6.20 CHILL built-in routine calls

7 Input and Output

7.1 I/O reference model

7.2 Association values

7.3 Access values

7.4 Built-in routines for input output

7.5 Text input output

8 Exception handling

8.1 General

8.2 Handlers

8.3 Handler identification

9 Time supervision

9.1 General

9.2 Timeoutable processes

9.3 Timing actions

9.4 Built-in routines for time

10 Program Structure

10.1 General

10.2 Reaches and nesting

10.3 Begin-end blocks

10.4 Procedure specifications and definitions

10.5 Process specifications and definitions

10.6

10.7 Regions

10.8 Program

10.9 Storage allocation and lifetime

10.10 Constructs for piecewise programming

10.11 Genericity

11 Concurrent execution

11.1 Processes, tasks, threads and their definitions

11.2 Mutual exclusion and regions

11.3 Delaying of a thread

11.4 Re-activation of a thread

11.5 Signal definition statements

11.6 Completion of Region and Task locations

12 General semantic properties

12.1 Mode rules

12.2 Visibility and name binding

12.3 Case selection

12.4 Definition and summary of semantic categories

13 Implementation options

13.1 Implementation defined built-in routines

13.2 Implementation defined integer modes

13.3 Implementation defined floating point modes

13.4 Implementation defined process names

13.5 Implementation defined handlers

13.6 Implementation defined exception names

13.7 Other implementation defined features

BS ISO/IEC 9496:2003

CHILL. The ITU-T programming language

Current

Published:

13 Apr 2004