when using pthreads block SIGIO
so it does not silently kill the gb
process because we no longer have a handler
for it because it was bogging down the cpu
because it went off every time a udp datagram
was sent/received and it seemed to have a ton
of overhead with it. SIGIO used to be sent
when the signal queue was full so we'd resort
to polling the file descriptors, so i'm not
sure how this will affect us. also updated
Threads.cpp to use getpidtid() instead of
getpid() to get the thread id when using
pthreads, not the process id. using pthreads
is now default behaviour even though they suck.
we used to use clone() but the newer stuff doesn't
allow us to override errno_location anymore.