This source file includes following definitions.
- current_is_single_threaded
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8 #include <linux/sched/signal.h>
9 #include <linux/sched/task.h>
10 #include <linux/sched/mm.h>
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15 bool current_is_single_threaded(void)
16 {
17 struct task_struct *task = current;
18 struct mm_struct *mm = task->mm;
19 struct task_struct *p, *t;
20 bool ret;
21
22 if (atomic_read(&task->signal->live) != 1)
23 return false;
24
25 if (atomic_read(&mm->mm_users) == 1)
26 return true;
27
28 ret = false;
29 rcu_read_lock();
30 for_each_process(p) {
31 if (unlikely(p->flags & PF_KTHREAD))
32 continue;
33 if (unlikely(p == task->group_leader))
34 continue;
35
36 for_each_thread(p, t) {
37 if (unlikely(t->mm == mm))
38 goto found;
39 if (likely(t->mm))
40 break;
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46 smp_rmb();
47 }
48 }
49 ret = true;
50 found:
51 rcu_read_unlock();
52
53 return ret;
54 }