slovodefinícia
system software
(foldoc)
system software

Any software required to support the
production or execution of application programs but which is
not specific to any particular application.

System software typically includes an operating system to
control the execution of other programs; user environment
software such as a command-line interpreter, {window
system}, desktop; development tools for building other
programs such as assemblers, compilers, linkers,
libraries, interpreters, cross-reference generators,
version control, make; debugging, profiling and
monitoring tools; utility programs, e.g. for sorting,
printing, and editting.

Different people would classify some or all of the above as
part of the operating system while others might say the
operating system was just the kernel. Some might say system
software includes utility programs like sort.

(2007-02-02)
podobné slovodefinícia
basic language for implementation of system software
(foldoc)
Basic Language for Implementation of System Software
BLISS

(BLISS, or allegedly, "System Software
Implementation Language, Backwards") A language designed by
W.A. Wulf at CMU around 1969.

BLISS is an expression language. It is block-structured,
and typeless, with exception handling facilities,
coroutines, a macro system, and a highly {optimising
compiler}. It was one of the first non-assembly languages
for operating system implementation. It gained fame for its
lack of a goto and also lacks implicit dereferencing: all
symbols stand for addresses, not values.

Another characteristic (and possible explanation for the
backward acronym) was that BLISS fairly uniformly used
backward keywords for closing blocks, a famous example being
ELUDOM to close a MODULE. An exception was BEGIN...END though
you could use (...) instead.

DEC introduced the NOVALUE keyword in their dialects to allow
statements to not return a value.

Versions: CMU BLISS-10 for the PDP-10; CMU BLISS-11,
BLISS-16, DEC BLISS-16C, DEC BLISS-32, BLISS-36 for
VAX/VMS, BLISS-36C.

["BLISS: A Language for Systems Programming", CACM
14(12):780-790, Dec 1971].

[Did the B stand for "Better"?]

(1997-03-01)

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