We have a lwp_kill() system call that sends a signal to a thread within
a process. It turns out to be fairly necessary for any sort of heavily
integrated multi-threaded work. In our case we need it to be able to
issue IPIs (aka SIGUSR1) to cpus within a SMP virtual kernel.
int lwp_kill(pid_t pid, lwpid_t tid, int sig);
-Matt
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