static int kthread(void *_create) { /* Copy data: it's on kthread's stack */ struct kthread_create_info *create = _create; int (*threadfn)(void *data) = create->threadfn; void *data = create->data; struct kthread self; int ret; self.flags = 0; self.data = data; init_completion(&self.exited); init_completion(&self.parked); current->vfork_done = &self.exited; /* OK, tell user we're spawned, wait for stop or wakeup */ __set_current_state(TASK_UNINTERRUPTIBLE); create->result = current; complete(&create->done); schedule(); ret = -EINTR; if (!test_bit(KTHREAD_SHOULD_STOP, &self.flags)) { __kthread_parkme(&self); ret = threadfn(data); } /* we can't just return, we must preserve "self" on stack */ do_exit(ret); }
static int kthread(void *_create) { /* Copy data: it's on kthread's stack */ struct kthread_create_info *create = _create; int (*threadfn)(void *data) = create->threadfn; void *data = create->data; struct kthread self; int ret; self.flags = 0; self.data = data; init_completion(&self.exited); init_completion(&self.parked); current->vfork_done = &self.exited; /* OK, tell user we're spawned, wait for stop or wakeup */ __set_current_state(TASK_UNINTERRUPTIBLE); create->result = current; /* * Disable preemption so we enter TASK_UNINTERRUPTIBLE after * complete() instead of possibly being preempted. This speeds * up clients that do a kthread_bind() directly after * creation. */ preempt_disable(); complete(&create->done); preempt_enable_no_resched(); schedule(); ret = -EINTR; if (!test_bit(KTHREAD_SHOULD_STOP, &self.flags)) { __kthread_parkme(&self); ret = threadfn(data); } /* we can't just return, we must preserve "self" on stack */ do_exit(ret); }
void kthread_parkme(void) { __kthread_parkme(to_kthread(current)); }