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| author |   Oleg Nesterov <oleg@redhat.com> | 2011-06-22 23:10:26 +0200 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2011-06-27 20:30:10 +0200 |
| commit | 087806b1281563e4ae7a5bce3155f894af5f4118 (patch) | |
| tree | 01547cd793de4e06f633293efa530a13ff2724a6 /include/linux/sched.h | |
| parent | do not change dead_task->exit_signal (diff) | |
| download | linux-dev-087806b1281563e4ae7a5bce3155f894af5f4118.tar.xz linux-dev-087806b1281563e4ae7a5bce3155f894af5f4118.zip | |
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>
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 39acee2c8929..b38ed51d5c64 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2284,8 +2284,10 @@ static inline int get_nr_threads(struct task_struct *tsk) return tsk->signal->nr_threads; } -/* de_thread depends on thread_group_leader not being a pid based check */ -#define thread_group_leader(p) (p == p->group_leader) +static inline bool thread_group_leader(struct task_struct *p) +{ + return p->exit_signal >= 0; +} /* Do to the insanities of de_thread it is possible for a process * to have the pid of the thread group leader without actually being |