linux-2.6.33/prepare_to_wait() の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-2.6.33/prepare_to_wait() へ行く。
• linux-2.6.33/prepare_to_wait() の差分を削除

*参照元 [#z72e185d]
#backlinks

*説明 [#wc4287ff]
-パス: [[linux-2.6.33/kernel/wait.c]]

-FIXME: これは何？
--説明


**引数 [#jc0d7765]
-wait_queue_head_t *q
--
--[[linux-2.6.33/wait_queue_head_t]]
-wait_queue_t *wait
--
--[[linux-2.6.33/wait_queue_t]]
-int state
--


**返り値 [#le6c5978]
-なし


**参考 [#j9ab45fb]


*実装 [#r2b6e78a]
 /*
  * Note: we use "set_current_state()" _after_ the wait-queue add,
  * because we need a memory barrier there on SMP, so that any
  * wake-function that tests for the wait-queue being active
  * will be guaranteed to see waitqueue addition _or_ subsequent
  * tests in this thread will see the wakeup having taken place.
  *
  * The spin_unlock() itself is semi-permeable and only protects
  * one way (it only protects stuff inside the critical region and
  * stops them from bleeding out - it would still allow subsequent
  * loads to move into the critical region).
  */
 void
 prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state)
 {
 	unsigned long flags;
 
 	wait->flags &= ~WQ_FLAG_EXCLUSIVE;
-
--[[linux-2.6.33/WQ_FLAG_EXCLUSIVE]]

 	spin_lock_irqsave(&q->lock, flags);
-
--[[linux-2.6.33/spin_lock_irqsave()]]

 	if (list_empty(&wait->task_list))
 		__add_wait_queue(q, wait);
-
--[[linux-2.6.33/list_empty()]]
--[[linux-2.6.33/__add_wait_queue()]]

 	set_current_state(state);
-
--[[linux-2.6.33/set_current_state()]]

 	spin_unlock_irqrestore(&q->lock, flags);
-
--[[linux-2.6.33/spin_unlock_irqrestore()]]

 }
 EXPORT_SYMBOL(prepare_to_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 [#t0e873f3]