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What's new in the Single UNIX® Specification Version 2 - A set of Technical White Papers

What is UNIX?

What is UNIX® 98?

UNIX 98 API tables

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The Single UNIX Specification Version 3

Slide Presentations

Test Tool Downloads

White Papers : The 64-bit UNIX system , Clustering

The Authorized Guide Book

Questions and Answers

Resources

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• The Single UNIX Specification
• The UNIX Certification Program

These web pages are a source of information for users on what's new in the Single UNIX Specification, Version 2 :

• What's new in the Single UNIX Specification, Version 2? .
• Adding Large File Support to the Single UNIX Specification .
• The Realtime Extension.
• Year 2000: The Millenium Rollover .
• The Dynamic Linking Extension .
• The Threads Extensions .
• The ISO C Amendment 1: Multibyte Support Extension .
• Data Size Neutrality in the Single UNIX Specification .
• Networking Services Migration
• A Threads White Paper [33 pages postscript] or PDF , extracted from Go Solo 2 , covering POSIX Pthreads and the X/Open Extensions.
• A Threads Summary.
• What about UNIX 98?

• Whats New?
• Threads Extensions
• 64-bit and DataSize Neutrality
• ISO C MSE

• Differences between the POSIX Shell and the System V Shell
• Thread-safety and POSIX.1

Background Information

The Single UNIX Specification, Version 2 aligns with the following:

• Alignment with the latest international standards:
  • ISO/IEC 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 behaviour.

    The Threads extensions permit development of applications to make significant performance gains on multiprocessor hardware.

  • ISO C Amendment 1: 1995 (Multibyte support)

    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 database applications.
• 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 applications.
• 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 CPUs.
• Year 2000 Alignment to minimise the impact of the millennium rollover.
• An optional Software Administration component for packaging software.

The Open Group has also introduced new test suites in support of the Single UNIX Specification, Version 2.