POSIX thread support in newlib

[Joel Sherrill <joel@OARcorp.com>]

Siders, Keith wrote:
> I saw this comment about lack of POSIX thread support in newlib in an
> inset block discussing Clibc.
>  
> http://www.embedded.com/story/OEG20011220S0058
>  
> " In addition, CLibc supports POSIX threads, a useful feature that
> newlib currently lacks. "
>  
> Since I'm looking at porting an application that has about 90 threads,
> this concerned me. Admittedly the page is fairly old (over three years -
> 12/28/01) so I'm hoping it's no longer a valid concern.

newlib provides some of the POSIX threads header files but
the thread implementation itself comes from the target OS.
Both RTEMS and Cygwin use newlib and both have pthreads.

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