diff options
| -rw-r--r-- | include/linux/sched/signal.h | 1 | ||||
| -rw-r--r-- | kernel/exit.c | 18 | ||||
| -rw-r--r-- | kernel/fork.c | 2 |
3 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h index cafbe03eed01..20099268fa25 100644 --- a/include/linux/sched/signal.h +++ b/include/linux/sched/signal.h @@ -94,6 +94,7 @@ struct signal_struct { refcount_t sigcnt; atomic_t live; int nr_threads; + int quick_threads; struct list_head thread_head; wait_queue_head_t wait_chldexit; /* for wait4() */ diff --git a/kernel/exit.c b/kernel/exit.c index a3929e5e6d61..d8ecbaa514f7 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -733,11 +733,29 @@ static void check_stack_usage(void) static inline void check_stack_usage(void) {} #endif +static void synchronize_group_exit(struct task_struct *tsk, long code) +{ + struct sighand_struct *sighand = tsk->sighand; + struct signal_struct *signal = tsk->signal; + + spin_lock_irq(&sighand->siglock); + signal->quick_threads--; + if ((signal->quick_threads == 0) && + !(signal->flags & SIGNAL_GROUP_EXIT)) { + signal->flags = SIGNAL_GROUP_EXIT; + signal->group_exit_code = code; + signal->group_stop_count = 0; + } + spin_unlock_irq(&sighand->siglock); +} + void __noreturn do_exit(long code) { struct task_struct *tsk = current; int group_dead; + synchronize_group_exit(tsk, code); + WARN_ON(tsk->plug); kcov_task_exit(tsk); diff --git a/kernel/fork.c b/kernel/fork.c index 9d44f2d46c69..67813b25a567 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1692,6 +1692,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) return -ENOMEM; sig->nr_threads = 1; + sig->quick_threads = 1; atomic_set(&sig->live, 1); refcount_set(&sig->sigcnt, 1); @@ -2444,6 +2445,7 @@ static __latent_entropy struct task_struct *copy_process( __this_cpu_inc(process_counts); } else { current->signal->nr_threads++; + current->signal->quick_threads++; atomic_inc(¤t->signal->live); refcount_inc(¤t->signal->sigcnt); task_join_group_stop(p); |