摘要:

AbstractThis paper describes a high‐level programming system for constructing vector and array processor based software involving the parallel language Actus. The system functions on a cross‐computer basis where a programmer develops Actus programs in a form that can be tested and transferred to the chosen supercomputer. The principles involved are, however, applicable to other similar block‐structured high‐level la

ISSN:0038-0644    

DOI:10.1002/spe.4380171002

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractCommand interpreters under the UNIX operating system typically employ the syntax and semantics of imperative programming languages. Many of the advantages that functional programming languages hold over imperative languages can be incorporated in a functional command interpreter. Unfortunately, functional command interpreters to date have used the syntax of Backus's FP. The advantages of command expressiveness and composition have not been appreciated. A powerful functional command interpreter,fsh, that overcomes many of the deterrents of previous functional command interpreters is presented. Much of the unnecessary complexity of existing UNIX command interpreters is avoided by following the functional paradigm.fshhas been implemented under the UNIX 4.2BSD and System V operating systems.

ISSN:0038-0644    

DOI:10.1002/spe.4380171003

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractLarge numbers of data processing applications require processing of master records and their associated detail records. These relationships between master and detail files may be classified as one‐to‐many, zero‐or‐one‐to‐many and many‐to‐many. All are important to information systems, but database management system implementations differ widely in their ability to represent and process such relationships. Processing of zero‐or‐one‐to‐many relationships, in particular, is difficult in most relational databases. An obscure relational algebra operator, left outer join, that provides such a capability is described and its importance to master‐detail processing is illustrated. An implementation of left outer join is presented for dBase III, a database management system providing some r

ISSN:0038-0644    

DOI:10.1002/spe.4380171004

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractA technique is presented, based on the method of tries, which allows direct access to variable‐length records in a sequential file. No reorganization of the original file is involve

ISSN:0038-0644    

DOI:10.1002/spe.4380171005

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractProfiling under UNIX is done by inserting counters into programs either before compiling, during compiling or during assembly. A fourth type of profiling involves monitoring the execution of a program, and gathering relevant statistics during the run. This paper looks at this method and an implementation of it, and discusses its advantages and disadvantages.

ISSN:0038-0644    

DOI:10.1002/spe.4380171006

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

摘要:

AbstractBNR Pascal is a systems programming language intended for the implementation of the systems software of distributed computing systems. It supports the Ada Rendezvous model of tasking and communication, uniformly extended to support communications between tasks distributed over the computing nodes of a system. BNR Pascal was designed and implemented in 1980, and has since been used to implement the operating systems and real‐time applications software for Northern Telecom's Meridian family of products. In total, more than 2 million lines of BNR Pascal exist. This paper describes the BNR Pascal remote rendezvous: the extension of rendezvous to interprocessor communication. It discusses the implementation of remote rendezvous, describing the advantages and disadvantages of several options. Finally, it details BNR's experience in using remote rendezvous in building substantial, practical distributed systems used in product

ISSN:0038-0644    

DOI:10.1002/spe.4380171007

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY

ISSN:0038-0644    

DOI:10.1002/spe.4380171001

出版商:John Wiley&Sons, Ltd.    

年代:1987

数据来源: WILEY