Thread Tutorials

[Andreas K. <a.k...@we...>]

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http://www-4.ibm.com/software/developer/library/posix1.html
http://www-4.ibm.com/software/developer/library/posix2.html

Something we may want to link to from the tcl thread documentation.
It mentions Tcl too, in the resource section. Pthreads-Tcl actually.
We should tell the author about the thread-safety we have since 8.3.

-- 
So long,
	Andreas Kupries <a.k...@we...>
			<http://www.purl.org/NET/akupries/>
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