摘要:

AbstractA protocol for file transfer between two computers connected by an asynchronous line and its implementation on a PDP11 are described.

ISSN:0038-0644    

DOI:10.1002/spe.4380141102

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractThis paper describes the implementation of a very powerful high level language from the standpoint of those features rarely found in other languages. These are constancy, polymorphism, user‐defined types, orthogonal data structures, and field selectors and routines as assignable values. It examines the characteristics of these features in order to show how they are implemented. They greatly influence the architecture of the underlying abstract machine which is described. Finally the paper highlights several important instructions such as those for routine calling and data structure management. It also shows how the list as a data type in a language can be exploited in the implementation of assignment and parameter passin

ISSN:0038-0644    

DOI:10.1002/spe.4380141103

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractThis paper describes the design and implementation of a totally faithful, portable PDP‐11 simulator that could be used in the porting of the UNIX operating system to a new target computer, without the need for a development system already running UNI

ISSN:0038-0644    

DOI:10.1002/spe.4380141104

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractRecent advances in hardware technology have made the construction of multiprocessor systems economically feasible. This paper describes a new programming language (Concurrent C) suitable for distributed systems which are networks of loosely connected processors, each with its own local storage. Concurrent C is the extended version of the programming language C, incorporating features for parallel processing and interprocess communications.

ISSN:0038-0644    

DOI:10.1002/spe.4380141105

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractPrimarily economic reasons have created a growing need for the development of operating systems providing support for existing and newly developed structurally different hardware systems–‐operating systems which(a) implement functionally different problem‐oriented solutions without imposing the need of developing problem‐invariant functions repeatedly (‘operating system family’)(b) work not only in a local environment, but also co‐operate with one another in an interconnected hardware system, thus appearing to the user as only one big operating system(c) are portable among structurally different hardware systems independent of one another (‘autonomous systems’), as well as among structurally different interconnected hardware systems (‘networks’)We present some principles of a structuring concept which seems to be a suitable means of developing operating systems with the specified characteristics in an economic

ISSN:0038-0644    

DOI:10.1002/spe.4380141106

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractAn efficient and systematic LL(1) error recovery method is presented that has been implemented for an LL(1) parser generator. Error messages which provide good diagnostic information are generated automatically. Error correction is done by discarding some input symbols and popping up some symbols from the parsing‐stack in order to restore the parser to a valid configuration. Thus, symbol deletions and insertions are simulated. The choice between different possible corrections is made by comparing the cost of the inserted (popped) symbols with the reliability value of the recovery symbol (the first input symbol that is not discarded). Our concept of reliability is based on the observation that input symbols differ from each other in their ability to serve as recovery points. A high reliability value of a symbol asserts that it was probably not placed in the input by accident. So it is reasonable not to discard that symbol but to resume parsing. This is done even if a string with high insert‐cost has to be inserted before that symbol in order to fit it to the part of the program that has already been analysed. The error recovery routine is invoked only when an error is detected. Thus, there is no additional time required for parsing correct programs. Error‐correcting parsers for different languages, including Pascal, have been generated. Some experimental results are summa

ISSN:0038-0644    

DOI:10.1002/spe.4380141107

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

ISSN:0038-0644    

DOI:10.1002/spe.4380141108

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

ISSN:0038-0644    

DOI:10.1002/spe.4380141101

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY