thread_kill</B> send signal number <I>signo</I> to the thread
<I>thread</I>. <B>pthreads-win32</B> only supports signal number 0,
which does not send any signal but causes <B>pthread_kill</B> to
return an error if <I>thread</I> is not valid.</P>
<P><B>sigwait</B> suspends the calling thread until one of the
signals in <I>set</I> is delivered to the calling thread. It then
stores the number of the signal received in the location pointed to
by <I>sig</I> and returns. The signals in <I>set</I> must be blocked
