> Date: Fri, 13 Dec 2013 19:42:17 -0800
> From: Philip Guenther <guent...@gmail.com>
>
> Testing whether a process is (currently) done by checking whether the
> process's thread list has a single item. This is currently done in just
> two places, but I expect to need this in more places, so let's abstract
> that into an inline function.
>
> Philip Guenther
>
>
> Index: sys/proc.h
> ===================================================================
> RCS file: /cvs/src/sys/sys/proc.h,v
> retrieving revision 1.172
> diff -u -p -r1.172 proc.h
> --- sys/proc.h 25 Oct 2013 04:42:48 -0000 1.172
> +++ sys/proc.h 14 Dec 2013 03:33:43 -0000
> @@ -523,6 +523,13 @@ int single_thread_set(struct proc *, enu
> void single_thread_clear(struct proc *, int);
> int single_thread_check(struct proc *, int);
>
> +static __inline int
> +process_is_multithreaded(struct process *pr)
> +{
> + struct proc *p = TAILQ_FIRST(&pr->ps_threads);
> + return (p != NULL && TAILQ_NEXT(p, p_thr_link) != NULL);
> +}
Not entirely the same how the checks are currently done. But it
should be equivalent. Will the ps_threads list ever be empty in an
observable way?
