#include #include void __init_swait_queue_head(struct swait_queue_head *q, const char *name, struct lock_class_key *key) { raw_spin_lock_init(&q->lock); lockdep_set_class_and_name(&q->lock, key, name); INIT_LIST_HEAD(&q->task_list); } EXPORT_SYMBOL(__init_swait_queue_head); /* * The thing about the wake_up_state() return value; I think we can ignore it. * * If for some reason it would return 0, that means the previously waiting * task is already running, so it will observe condition true (or has already). */ void swake_up_locked(struct swait_queue_head *q) { struct swait_queue *curr; if (list_empty(&q->task_list)) return; curr = list_first_entry(&q->task_list, typeof(*curr), task_list); wake_up_process(curr->task); list_del_init(&curr->task_list); } EXPORT_SYMBOL(swake_up_locked); void swake_up(struct swait_queue_head *q) { unsigned long flags; if (!swait_active(q)) return; raw_spin_lock_irqsave(&q->lock, flags); swake_up_locked(q); raw_spin_unlock_irqrestore(&q->lock, flags); } EXPORT_SYMBOL(swake_up); /* * Does not allow usage from IRQ disabled, since we must be able to * release IRQs to guarantee bounded hold time. */ void swake_up_all(struct swait_queue_head *q) { struct swait_queue *curr; LIST_HEAD(tmp); if (!swait_active(q)) return; raw_spin_lock_irq(&q->lock); list_splice_init(&q->task_list, &tmp); while (!list_empty(&tmp)) { curr = list_first_entry(&tmp, typeof(*curr), task_list); wake_up_state(curr->task, TASK_NORMAL); list_del_init(&curr->task_list); if (list_empty(&tmp)) break; raw_spin_unlock_irq(&q->lock); raw_spin_lock_irq(&q->lock); } raw_spin_unlock_irq(&q->lock); } EXPORT_SYMBOL(swake_up_all); void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait) { wait->task = current; if (list_empty(&wait->task_list)) list_add(&wait->task_list, &q->task_list); } void prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait, int state) { unsigned long flags; raw_spin_lock_irqsave(&q->lock, flags); __prepare_to_swait(q, wait); set_current_state(state); raw_spin_unlock_irqrestore(&q->lock, flags); } EXPORT_SYMBOL(prepare_to_swait); long prepare_to_swait_event(struct swait_queue_head *q, struct swait_queue *wait, int state) { if (signal_pending_state(state, current)) return -ERESTARTSYS; prepare_to_swait(q, wait, state); return 0; } EXPORT_SYMBOL(prepare_to_swait_event); void __finish_swait(struct swait_queue_head *q, struct swait_queue *wait) { __set_current_state(TASK_RUNNING); if (!list_empty(&wait->task_list)) list_del_init(&wait->task_list); } void finish_swait(struct swait_queue_head *q, struct swait_queue *wait) { unsigned long flags; __set_current_state(TASK_RUNNING); if (!list_empty_careful(&wait->task_list)) { raw_spin_lock_irqsave(&q->lock, flags); list_del_init(&wait->task_list); raw_spin_unlock_irqrestore(&q->lock, flags); } } EXPORT_SYMBOL(finish_swait); include/net/sctp/command.h

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