On 04/10, Eric W. Biederman wrote:
>
> +int kthreadd(void *unused)
> +{
> + /* Setup a clean context for our children to inherit. */
> + kthreadd_setup();
> +
> + current->flags |= PF_NOFREEZE;
> +
> + for (;;) {
> + wait_event(kthread_create_work,
> + !list_empty(&kthread_create_list));
> +
> + spin_lock(&kthread_create_lock);
> + while (!list_empty(&kthread_create_list)) {
Do we need to check the condition under lock? We can miss an event,
but then it will be noticed by wait_event() above.
> + struct kthread_create_info *create;
> +
> + create = list_entry(kthread_create_list.next,
> + struct kthread_create_info, list);
> + list_del_init(&create->list);
> + spin_unlock(&kthread_create_lock);
> +
> + create_kthread(create);
> +
> + spin_lock(&kthread_create_lock);
> + }
> + spin_unlock(&kthread_create_lock);
> + }
IOW,
for (;;) {
wait_event(kthread_create_work,
!list_empty(&kthread_create_list));
while (!list_empty(&kthread_create_list)) {
struct kthread_create_info *create;
spin_lock(&kthread_create_lock);
create = list_entry(kthread_create_list.next,
struct kthread_create_info, list);
list_del_init(&create->list);
spin_unlock(&kthread_create_lock);
create_kthread(create);
}
}
Oleg.
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