linux-2.6.33/__down_common() 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/__down_common() へ行く。
  • 1 (2011-05-24 (火) 13:39:17)

参照元†

説明†

• パス: linux-2.6.33/kernel/semaphore.c

• FIXME: これは何？
  • 説明

引数†

• struct semaphore *sem
  • linux-2.6.33/semaphore
• long state
• long timeout

返り値†

• int

参考†

実装†

/*
 * Because this function is inlined, the 'state' parameter will be
 * constant, and thus optimised away by the compiler.  Likewise the
 * 'timeout' parameter for the cases without timeouts.
 */
static inline int __sched __down_common(struct semaphore *sem, long state,
								long timeout)
{
	struct task_struct *task = current;
	struct semaphore_waiter waiter;

• • linux-2.6.33/task_struct

• linux-2.6.33/current(global)

• • linux-2.6.33/semaphore_waiter

	list_add_tail(&waiter.list, &sem->wait_list);
	waiter.task = task;
	waiter.up = 0;

• • linux-2.6.33/list_add_tail()

	for (;;) {
		if (signal_pending_state(state, task))
			goto interrupted;

• • linux-2.6.33/signal_pending_state()

		if (timeout <= 0)
			goto timed_out;
		__set_task_state(task, state);

• • linux-2.6.33/__set_task_state()

		spin_unlock_irq(&sem->lock);

• • linux-2.6.33/spin_unlock_irq()

		timeout = schedule_timeout(timeout);

• • linux-2.6.33/schedule_timeout()

		spin_lock_irq(&sem->lock);
		if (waiter.up)
			return 0;

• • linux-2.6.33/spin_lock_irq()

	}

 timed_out:
	list_del(&waiter.list);
	return -ETIME;

• • linux-2.6.33/list_del()

• linux-2.6.33/ETIME

 interrupted:
	list_del(&waiter.list);
	return -EINTR;

• • linux-2.6.33/EINTR

}

コメント†