netdev - Re: when and where does ep_poll

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Date:	Mon, 14 Jan 2013 08:35:29 -0800
From:	Randy Dunlap <rdunlap@...radead.org>
To:	horseriver <horserivers@...il.com>
CC:	netdev@...r.kernel.org
Subject: Re: when and where does ep_poll_callback be called ?

On 01/13/13 17:11, horseriver wrote:
> hi:
> 
> 
>    I'm studying the epoll module , I can not find ep_poll_callback be called somewhere .


It's right there in fs/eventpoll.c:


/*
 * This is the callback that is used to add our wait queue to the
 * target file wakeup lists.
 */
static void ep_ptable_queue_proc(struct file *file, wait_queue_head_t *whead,
				 poll_table *pt)
{
	struct epitem *epi = ep_item_from_epqueue(pt);
	struct eppoll_entry *pwq;

	if (epi->nwait >= 0 && (pwq = kmem_cache_alloc(pwq_cache, GFP_KERNEL))) {
>>>>>		init_waitqueue_func_entry(&pwq->wait, ep_poll_callback);
		pwq->whead = whead;
		pwq->base = epi;
		add_wait_queue(whead, &pwq->wait);
		list_add_tail(&pwq->llink, &epi->pwqlist);
		epi->nwait++;



-- 
~Randy
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