linux-2.6.33/__wait_on_bit() 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/__wait_on_bit() へ行く。
  • 1 (2012-10-05 (金) 12:38:56)

参照元†

• linux-2.6.33/out_of_line_wait_on_bit()

説明†

• パス: linux-2.6.33/kernel/wait.c

• FIXME: これは何？
  • 説明

引数†

• wait_queue_head_t *wq
  • linux-2.6.33/wait_queue_head_t
• struct wait_bit_queue *q
  • linux-2.6.33/wait_bit_queue
• int (*action)(void *)
• unsigned mode

返り値†

• int

参考†

実装†

/*
 * To allow interruptible waiting and asynchronous (i.e. nonblocking)
 * waiting, the actions of __wait_on_bit() and __wait_on_bit_lock() are
 * permitted return codes. Nonzero return codes halt waiting and return.
 */
int __sched
__wait_on_bit(wait_queue_head_t *wq, struct wait_bit_queue *q,
			int (*action)(void *), unsigned mode)
{
	int ret = 0;

	do {
		prepare_to_wait(wq, &q->wait, mode);

• • linux-2.6.33/prepare_to_wait()

		if (test_bit(q->key.bit_nr, q->key.flags))
			ret = (*action)(q->key.flags);

• • linux-2.6.33/test_bit()

	} while (test_bit(q->key.bit_nr, q->key.flags) && !ret);
	finish_wait(wq, &q->wait);

• • linux-2.6.33/finish_wait()

	return ret;
}
EXPORT_SYMBOL(__wait_on_bit);

• • linux-2.6.33/EXPORT_SYMBOL()

コメント†