Messages in this thread | | | Date | Sat, 28 Oct 2006 12:41:50 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [patch] drivers: wait for threaded probes between initcall levels |
| |
On Sat, 28 Oct 2006, Adam J. Richter wrote:
> On Fri, 27 Oct 2006 13:42:44 -0700 (PDT), Linus Torvals wrote: > > static struct semaphore outstanding; > [...] > > static void allow_parallel(int n) > [...] > > static void wait_for_parallel(int n) > [...] > > static void execute_in_parallel(int (*fn)(void *), void *arg) > > This interface would have problems with nesting.
You miss the point.
They _wouldn't_ be nested.
The "allow_parallel()" and "wait_for_parallel()" calls would be at some top-level situation (ie initcalls looping).
Nobody else than the top level would _ever_ use them. Anything under that level would just say "I want to do this in parallel" - which is just a statement, and has no nesting issues in itself.
The whole notion of "I want to do this in parallel" is basically non-nesting. If something is parallel, it's by definition not ordered, and thus nesting cannot make sense. All the "ordered" stuff would be either done without using "execute_in_parallel()" at all, or it would be ordered _within_ one thread that is executed in parallel.
Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |