Hi!
> > #define task_running(rq, p) \
> > ((rq)->curr == (p)) && !spin_is_locked(&(p)->switch_lock)
>
> one more implementational note: the above test is not 'sharp' in the sense
> that on SMP it's only correct (the test has no barriers) if the runqueue
> lock is held. This is true for all the critical task_running() uses in
> sched.c - and the cases that use it outside the runqueue lock are
> optimizations so they dont need an exact test.
I believe this is worth a *big fat* comment.
Pavel
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This archive was generated by hypermail 2b29 : Mon Jul 15 2002 - 22:00:22 EST