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- #include <linux/sched.h>
- bool current_is_single_threaded(void)
- {
- struct task_struct *task = current;
- struct mm_struct *mm = task->mm;
- struct task_struct *p, *t;
- bool ret;
- if (atomic_read(&task->signal->live) != 1)
- return false;
- if (atomic_read(&mm->mm_users) == 1)
- return true;
- ret = false;
- rcu_read_lock();
- for_each_process(p) {
- if (unlikely(p->flags & PF_KTHREAD))
- continue;
- if (unlikely(p == task->group_leader))
- continue;
- for_each_thread(p, t) {
- if (unlikely(t->mm == mm))
- goto found;
- if (likely(t->mm))
- break;
-
- smp_rmb();
- }
- }
- ret = true;
- found:
- rcu_read_unlock();
- return ret;
- }
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