TECHNICAL INFORMATION DOCUMENT

TITLE:  TF2176 - Threads Library Patch
DATE:  04DEC95
README FOR:  TF2176
PRODUCT and VERSION:

UnixWare 2.01

Installation Instructions:  

DATATYPE: datastream

1.  Download the tf2176.Z and tf2176.txt files to the /tmp directory
    on your machine.

2.  Read the release notes contained in this file and follow the 
    instuctions to add the package to your system.

3.  Now become root, uncompress the file and add the package to your 
    system using the following commands:

        $ su
        # uncompress /tmp/tf2176.Z
        # pkgadd -d /tmp/tf2176

ENGINEERING RELEASE NOTES
-------------------------

Title
-----

PTF2176 - Threads Library Patch

Product And Version
-------------------

UnixWare 2.01, UnixWare 2.02, UnixWare 2.03

Abstract
--------

Corrects two errors in signal-related processing by the Threads
Library.

Symptom
--------

1) A Threads application that calls sigwait() may cause the entire
   process to block; only the thread that calls sigwait() should
   block.
2) Calling sigset() to register a signal handler fails to remove
   the specified signal from a thread's signal mask; if an
   invoking thread (or process) has masked the signal, the signal
   handler will never be called.


SOLUTION SPECIFICS
------------------

General Description.
-------------------

This PTF installs a new Threads Library which corrects the errors
described above.


New Features.
------------

None

Software Notes and Recommendations.
----------------------------------

This PTF should be installed on all UnixWare 2.01, 2.02 or 2.03
systems.  It will need to be reinstalled following the
installation of Update 2.02 and/or Update 2.03.

Testing of the modified software contained in this package has
been conducted only to the extent necessary to confirm that it
resolves the problem(s) stated above ("Symptom").  Such testing
consists of recreating the problem conditions and verifying that 
the problem no longer occurs.  No other testing of this software 
has been done.

Hardware Notes and Recommendations.
----------------------------------

This PTF is targeted for the i386, i486 and Pentium CPU's.