linux-2.6.33/finish_wait() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-2.6.33/finish_wait() へ行く。
  • 1 (2011-07-06 (水) 09:20:14)

参照元†

• linux-2.6.33/__pm_runtime_resume()
• linux-2.6.33/__wait_event_interruptible()
• linux-2.6.33/__wait_on_bit()
• linux-2.6.33/kswapd()
• linux-2.6.33/worker_thread()

説明†

• パス: [[linux-2.6.33/]]

• FIXME: これは何？
  • 説明

引数†

• wait_queue_head_t *q
  • linux-2.6.33/wait_queue_head_t
• wait_queue_t *wait
  • linux-2.6.33/wait_queue_t

返り値†

• なし

参考†

実装†

/*
 * finish_wait - clean up after waiting in a queue
 * @q: waitqueue waited on
 * @wait: wait descriptor
 *
 * Sets current thread back to running state and removes
 * the wait descriptor from the given waitqueue if still
 * queued.
 */
void finish_wait(wait_queue_head_t *q, wait_queue_t *wait)
{
	unsigned long flags;

	__set_current_state(TASK_RUNNING);

• • linux-2.6.33/__set_current_state()

	/*
	 * We can check for list emptiness outside the lock
	 * IFF:
	 *  - we use the "careful" check that verifies both
	 *    the next and prev pointers, so that there cannot
	 *    be any half-pending updates in progress on other
	 *    CPU's that we haven't seen yet (and that might
	 *    still change the stack area.
	 * and
	 *  - all other users take the lock (ie we can only
	 *    have _one_ other CPU that looks at or modifies
	 *    the list).
	 */
	if (!list_empty_careful(&wait->task_list)) {

• • linux-2.6.33/list_empty_careful()

		spin_lock_irqsave(&q->lock, flags);
		list_del_init(&wait->task_list);
		spin_unlock_irqrestore(&q->lock, flags);

• • linux-2.6.33/spin_lock_irqsave()
  • linux-2.6.33/list_del_init()
  • linux-2.6.33/spin_unlock_irqrestore()

	}
}
EXPORT_SYMBOL(finish_wait);

• ライセンスに関係なくシンボルを公開する。
  • linux-2.6.33/EXPORT_SYMBOL()

コメント†