Cthread2Pthread

[Vicente Hernando Ara]

Hi all!

Here is attached a diff of libpipe directory, with code changed to
pthreads.
I have substituted condition_implies function with a pointer trick.

Waiting for some feedback. ;)

There are also some code for checking in
http://es.gnu.org/~zenton/Pthread

Thanks,
Vicente.

PD: Merry Christmas to all. ;)

libpipe.diff
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