1 /* Function to determine if a thread group is single threaded or not
3 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * - Derived from security/selinux/hooks.c
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public Licence
9 * as published by the Free Software Foundation; either version
10 * 2 of the Licence, or (at your option) any later version.
13 #include <linux/sched.h>
16 * Returns true if the task does not share ->mm with another thread/process.
18 bool current_is_single_threaded(void)
20 struct task_struct
*task
= current
;
21 struct mm_struct
*mm
= task
->mm
;
22 struct task_struct
*p
, *t
;
25 if (atomic_read(&task
->signal
->live
) != 1)
28 if (atomic_read(&mm
->mm_users
) == 1)
34 if (unlikely(p
->flags
& PF_KTHREAD
))
36 if (unlikely(p
== task
->group_leader
))
41 if (unlikely(t
->mm
== mm
))
46 * t->mm == NULL. Make sure next_thread/next_task
47 * will see other CLONE_VM tasks which might be
48 * forked before exiting.
51 } while_each_thread(p
, t
);
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