tree 01547cd793de4e06f633293efa530a13ff2724a6
parent d4f7c511c1c2a67eb287987cf1ce9554149030e6
author Oleg Nesterov <oleg@redhat.com> 1308777026 +0200
committer Oleg Nesterov <oleg@redhat.com> 1309199410 +0200

redefine thread_group_leader() as exit_signal >= 0

Change de_thread() to set old_leader->exit_signal = -1. This is
good for the consistency, it is no longer the leader and all
sub-threads have exit_signal = -1 set by copy_process(CLONE_THREAD).

And this allows us to micro-optimize thread_group_leader(), it can
simply check exit_signal >= 0. This also makes sense because we
should move ->group_leader from task_struct to signal_struct.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Tejun Heo <tj@kernel.org>