summaryrefslogtreecommitdiffstats
path: root/lib/timerqueue.c
blob: 7a8ae3d5fd40577ae5a4295fb23abd0dc11647f6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
/*
 *  Generic Timer-queue
 *
 *  Manages a simple queue of timers, ordered by expiration time.
 *  Uses rbtrees for quick list adds and expiration.
 *
 *  NOTE: All of the following functions need to be serialized
 *  to avoid races. No locking is done by this library code.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/bug.h>
#include <linux/timerqueue.h>
#include <linux/rbtree.h>
#include <linux/export.h>

/**
 * timerqueue_add - Adds timer to timerqueue.
 *
 * @head: head of timerqueue
 * @node: timer node to be added
 *
 * Adds the timer node to the timerqueue, sorted by the node's expires
 * value. Returns true if the newly added timer is the first expiring timer in
 * the queue.
 */
bool timerqueue_add(struct timerqueue_head *head, struct timerqueue_node *node)
{
	struct rb_node **p = &head->rb_root.rb_root.rb_node;
	struct rb_node *parent = NULL;
	struct timerqueue_node *ptr;
	bool leftmost = true;

	/* Make sure we don't add nodes that are already added */
	WARN_ON_ONCE(!RB_EMPTY_NODE(&node->node));

	while (*p) {
		parent = *p;
		ptr = rb_entry(parent, struct timerqueue_node, node);
		if (node->expires < ptr->expires) {
			p = &(*p)->rb_left;
		} else {
			p = &(*p)->rb_right;
			leftmost = false;
		}
	}
	rb_link_node(&node->node, parent, p);
	rb_insert_color_cached(&node->node, &head->rb_root, leftmost);

	return leftmost;
}
EXPORT_SYMBOL_GPL(timerqueue_add);

/**
 * timerqueue_del - Removes a timer from the timerqueue.
 *
 * @head: head of timerqueue
 * @node: timer node to be removed
 *
 * Removes the timer node from the timerqueue. Returns true if the queue is
 * not empty after the remove.
 */
bool timerqueue_del(struct timerqueue_head *head, struct timerqueue_node *node)
{
	WARN_ON_ONCE(RB_EMPTY_NODE(&node->node));

	rb_erase_cached(&node->node, &head->rb_root);
	RB_CLEAR_NODE(&node->node);

	return !RB_EMPTY_ROOT(&head->rb_root.rb_root);
}
EXPORT_SYMBOL_GPL(timerqueue_del);

/**
 * timerqueue_iterate_next - Returns the timer after the provided timer
 *
 * @node: Pointer to a timer.
 *
 * Provides the timer that is after the given node. This is used, when
 * necessary, to iterate through the list of timers in a timer list
 * without modifying the list.
 */
struct timerqueue_node *timerqueue_iterate_next(struct timerqueue_node *node)
{
	struct rb_node *next;

	if (!node)
		return NULL;
	next = rb_next(&node->node);
	if (!next)
		return NULL;
	return container_of(next, struct timerqueue_node, node);
}
EXPORT_SYMBOL_GPL(timerqueue_iterate_next);