:This is fine to me, did you consider how to exit whole process not
:just a single thread ? right now, I am using _exit(), but it only
:exits current thread, other threads can not be shutdown.
The problem with using _exit() to exit all threads is that there
is no way to notify the other threads of the event, and there are
cases where we might want that feature. I think what we want here
is a signal rather then a system call.
Since we are already going to create a distinction in the signal handling
between vectored and shared signals, there is no reason why we couldn't
also create the concept of a 'broadcast' signal, that all threads get.
SIGKILL, SIGSTOP, SIGTSTP, SIGCONT... these would all be broadcast
signals by default.
We would implement it via sigaction(). We would add a SA_BROADCAST
flag to handle broadcast signals, and we would also add a SA_VECTORED
flag to differentiate between shared signals and targeted signals.