These web pages
are a source of information for users on what's new in
the Single UNIX Specification, Version 2
Articles submitted to Usenix ;Login
The Single UNIX Specification,
Version 2 aligns with the following:
- Alignment with the latest
9945-1:1996 which incorporates ANSI/IEEE Std
POSIX 1003.1-1990, 1003.1b-1993, 1003.1c-1995
and 1003.1i-1995 [1003.1b-1993 and
1003.1i-1995 are Realtime extensions .
1003.1c-1995 is Threads extensions.]
The Realtime extensions
are an optional
feature group, allowing procurement of X/Open
realtime systems with predictable , bounded
The Threads extensions
permit development of
applications to make significant performance
gains on multiprocessor hardware.
- ISO C Amendment 1: 1995
This further enhances X/Open's
internationalised applications support.
- Large File Summit
extensions to permit UNIX systems to support files of
arbitrary sizes, this is of particular relevance to
- Extended Threads
functions over POSIX threads, based on industry input
from Sun, Digital, HP and DCE.
- Dynamic linking
extensions to permit applications to share common
code across many applications, and ease maintenance
of bug fixes and performance enhancements for
- N-bit cleanup (64
bit and beyond) , to remove any architectural
dependencies in the UNIX specification. This is of
particular relevance with the ongoing move to 64 bit
- Year 2000 Alignment
to minimise the impact of the millennium rollover.
- An optional Software
component for packaging software.
The Open Group has also
new test suites in support of the Single UNIX
Specification, Version 2.