Patch to add support for POSIX SIGEV_THREAD handling

[Dan Jakubiec <djakubiec at yahoo dot com>]

Attached is a patch that adds support for the POSIX
SIGEV_THREAD signal notification type.  SIGEV_THREAD
is a type of signal notification that can be used to
launch a POSIX thread instead of delivering an actual
POSIX signal.

I would appreciate any feedback on the patch.  In
particular, the section in cyg_sigqueue() that
actually launches the notification thread chooses some
default thread characteristics that aren't defined by
POSIX.  I chose some that seemed reasonable.

I was going to add some CDL options to allow
configuration of these default parameters
(specifically thread stack size and execution
priority).  However, after some deliberation I changed
my mind.  Seems like POSIX threads should not rely on
these values and should instead specify them
explicitly by using the thread attributes parameter in
sigevent.  Any comments on this?

Finally, I apologize but I couldn't figure out how to
add a new file to a patch.  I attached a new test file
to test this code.  It belongs in
ecos/packages/compat/posix/current/tests/signal4.c. 
This file need a GPL header of some sort and I wasn't
sure what to use.  Can someone help here?

Thanks,

--
Dan Jakubiec
Systech Corp

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Attachment: sigev_thread.pat
Description: sigev_thread.pat

Attachment: signal4.c
Description: signal4.c