Hello.
Rajat Jain wrote:
> > In other words, is there a moment that
> > a valid task_struct with my_pointer == some_address
> > exists but not linked in the tasklist?
> No.
>
> Thanks,
Thank you, Rajat.
Yes, do_fork() copies task_struct but the copy is not linked in.
But that is acceptable, because (at least)
the original task_struct exists and is linked in,
the for_each_process loop returns count > 0.
So, I can use
struct task_struct *p;
int flag = 0;
read_lock(&tasklist_lock);
for_each_process(p) {
if (p->my_pointer == some_address) { flag = 1; break; }
}
if (!flag) { /* mark some_address not referenced by any process */ }
read_unlock(&tasklist_lock);
because all I need to know is
"Whether some_address is referenced at that moment?"
to implement garbage collector.
Am I right?
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