BS ISO/IEC BRITISH STANDARD 9496:2003 CHILL The ITU-T programming language ICS 35.060 BSi NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLA British Standards BS ISO/IEC 9496:2003 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 It supersedes BS ISO/IEC 9496:1995 which is withdrawn.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 ofitself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO/IEC title page, pages ii to vi, a blank page, pages 1 to 221 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication This British Standard was published under the authority Amd. No. Date Comments of the Standards Policy and Strategy Committee on 13 April 2004 BSI13April2004 ISBN 0 580 43648 9 BS ISO/IEC 9496:2003 INTERNATIONAL ISO/IEC STANDARD 9496 Fourth edition 2003-12-15 CHILL The ITU-T programming language CHILL - Le langage de programmation de I'UIT-T Reference number ISO/IEC 9496:2003(E) IF 1SO BS ISO/IEC 9496:2003 ii BS ISO/IEC 9496:2003 CONTENTS Page 1 Introduction 1 1.1 General 1.2 1.3 Modes and classe 2 1.4 3 1.5 3 1.6 Actions 4 1.7 Input and output 4 1.8 Exception handling 4 1.9 Time supervision 5 1.10 Program structure 5 1.11 Concurrent execution 5 1.12 General semantic properties 6 1.13 Implementation options. 6 2 Preliminaries 2.1 The metalanguage . 7 2.2 Vocabulary . 8 2.3 The use of spaces . 9 2.4 Comments 9 2.5 Format effectors 9 2.6 Compilerdirectives 10 2.7 Names and their defining occurrences 10 3 Modes and classes 12 3.1 General 12 3.2 Mode definitions 13 3.3 Mode classification 16 3.4 Discrete modes 17 3.5 Real modes 20 3.6 Powerset modes. 22 3.7 Reference modes . 22 3.8 Procedure modes . 23 3.9 Instance modes 24 3.10 Synchronization modes 25 3.11 Input-Output Modes 26 3.12 Timing modes 28 3.13 Composite modes 29 3.14 Dynamic modes.. 37 3.15 Moreta Modes 38 4 Locations and their accesses 45 4.1 Declarations .. 45 4.2 Locations. 47 5 54 5.1 Synonym definitions. 54 5.2 Primitive value 55 5.3 Values and expressions 70 ii BS ISO/IEC 9496:2003 CONTENTS Page 1 Introduction 1 1.1 General 1.2 1.3 Modes and classe 2 1.4 3 1.5 3 1.6 Actions 4 1.7 Input and output 4 1.8 Exception handling 4 1.9 Time supervision 5 1.10 Program structure 5 1.11 Concurrent execution 5 1.12 General semantic properties 6 1.13 Implementation options. 6 2 Preliminaries 2.1 The metalanguage . 7 2.2 Vocabulary . 8 2.3 The use of spaces . 9 2.4 Comments 9 2.5 Format effectors 9 2.6 Compilerdirectives 10 2.7 Names and their defining occurrences 10 3 Modes and classes 12 3.1 General 12 3.2 Mode definitions 13 3.3 Mode classification 16 3.4 Discrete modes 17 3.5 Real modes 20 3.6 Powerset modes. 22 3.7 Reference modes . 22 3.8 Procedure modes . 23 3.9 Instance modes 24 3.10 Synchronization mo