On Jan 23, 2006, at 22:39, Albert Cahalan wrote:
Then there is the other weird side where only the leaders of
thread groups are placed in sessions and process groups.
That's not at all weird. It fits perfectly with the use of the tgid
as the POSIX PID and the use of the "pid" (ugh) as the POSIX thread
ID.
Aside from POSIX just being arguably weird, the only weird things
here are:
1. kill() not returning errno=ESRCH when it should
2. the name "pid" being used oddly in the kernel
And actually, my use of the task->pid member was correct. The "pid
virtualization" patches are virtualizing not only the process IDs,
but the thread IDs as well (the whole point is to provide completely
unique PID/TID spaces, so everything needs to be virtualized). In
any case, it was just a poorly chosen example (because that
particular virtualization bit was not necessary). I agree with you
that the kernel's behavior is weird, but it has its reasons and a lot
of history. If you think it's that important, a cleanup patch
(assuming it's not too intrusive) would probably be welcomed.
Cheers,
Kyle Moffett
--
I lost interest in "blade servers" when I found they didn't throw
knives at people who weren't supposed to be in your machine room.
-- Anthony de Boer
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