exit: change zap_other_threads() to count sub-threads

Change zap_other_threads() to return the number of other sub-threads found
on ->thread_group list.

Other changes are cosmetic:

	- change the code to use while_each_thread() helper

	- remove the obsolete comment about SIGKILL/SIGSTOP

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4f31a16..a95a245 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2036,7 +2036,7 @@ extern int do_notify_parent(struct task_struct *, int);
 extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
 extern void force_sig(int, struct task_struct *);
 extern int send_sig(int, struct task_struct *, int);
-extern void zap_other_threads(struct task_struct *p);
+extern int zap_other_threads(struct task_struct *p);
 extern struct sigqueue *sigqueue_alloc(void);
 extern void sigqueue_free(struct sigqueue *);
 extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);

diff --git a/kernel/signal.c b/kernel/signal.c
index 2ee9573..906ae5a 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1085,23 +1085,24 @@ force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
 /*
  * Nuke all other threads in the group.
  */
-void zap_other_threads(struct task_struct *p)
+int zap_other_threads(struct task_struct *p)
 {
-       struct task_struct *t;
+       struct task_struct *t = p;
+       int count = 0;
 
        p->signal->group_stop_count = 0;
 
-       for (t = next_thread(p); t != p; t = next_thread(t)) {
-               /*
-                * Don't bother with already dead threads
-                */
+       while_each_thread(p, t) {
+               count++;
+
+               /* Don't bother with already dead threads */
                if (t->exit_state)
                        continue;
-
-               /* SIGKILL will be handled before any pending SIGSTOP */
                sigaddset(&t->pending.signal, SIGKILL);
                signal_wake_up(t, 1);
        }
+
+       return count;
 }
 
 struct sighand_struct *lock_task_sighand(struct task_struct *tsk, unsigned long *flags)