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cbea8737 DS |
1 | /* |
2 | * Timer Wheel | |
3 | * Copyright (C) 2016 Cumulus Networks, Inc. | |
4 | * Donald Sharp | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
896014f4 DL |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
cbea8737 DS |
19 | */ |
20 | #include "zebra.h" | |
21 | #include "linklist.h" | |
22 | #include "thread.h" | |
23 | #include "memory.h" | |
24 | #include "wheel.h" | |
25 | #include "log.h" | |
26 | ||
27 | DEFINE_MTYPE_STATIC(LIB, TIMER_WHEEL, "Timer Wheel") | |
28 | DEFINE_MTYPE_STATIC(LIB, TIMER_WHEEL_LIST, "Timer Wheel Slot List") | |
29 | ||
30 | static int debug_timer_wheel = 0; | |
31 | ||
32 | static int | |
33 | wheel_timer_thread (struct thread *t) | |
34 | { | |
35 | struct listnode *node, *nextnode; | |
36 | unsigned long long curr_slot; | |
37 | unsigned int slots_to_skip = 1; | |
38 | struct timer_wheel *wheel; | |
39 | void *data; | |
40 | ||
41 | wheel = THREAD_ARG(t); | |
42 | THREAD_OFF(wheel->timer); | |
43 | ||
44 | wheel->curr_slot += wheel->slots_to_skip; | |
45 | ||
46 | curr_slot = wheel->curr_slot % wheel->slots; | |
47 | ||
48 | if (debug_timer_wheel) | |
49 | zlog_debug ("%s: Wheel Slot: %lld(%lld) count: %d", | |
50 | __PRETTY_FUNCTION__, | |
51 | wheel->curr_slot, | |
52 | curr_slot, listcount(wheel->wheel_slot_lists[curr_slot])); | |
53 | ||
54 | for (ALL_LIST_ELEMENTS (wheel->wheel_slot_lists[curr_slot], node, nextnode, data)) | |
55 | (*wheel->slot_run)(data); | |
56 | ||
57 | while (list_isempty(wheel->wheel_slot_lists[(curr_slot + slots_to_skip) % wheel->slots]) && | |
58 | (curr_slot + slots_to_skip ) % wheel->slots != curr_slot) | |
59 | slots_to_skip++; | |
60 | ||
61 | wheel->slots_to_skip = slots_to_skip; | |
ffa2c898 QY |
62 | thread_add_timer_msec(wheel->master, wheel_timer_thread, wheel, |
63 | wheel->nexttime * slots_to_skip, &wheel->timer); | |
cbea8737 DS |
64 | |
65 | return 0; | |
66 | } | |
67 | ||
68 | struct timer_wheel * | |
69 | wheel_init (struct thread_master *master, int period, size_t slots, | |
70 | unsigned int (*slot_key) (void *), | |
71 | void (*slot_run) (void *)) | |
72 | { | |
73 | struct timer_wheel *wheel; | |
74 | size_t i; | |
75 | ||
76 | wheel = XCALLOC(MTYPE_TIMER_WHEEL, sizeof (struct timer_wheel)); | |
77 | ||
78 | wheel->slot_key = slot_key; | |
79 | wheel->slot_run = slot_run; | |
80 | ||
81 | wheel->period = period; | |
82 | wheel->slots = slots; | |
83 | wheel->curr_slot = 0; | |
84 | wheel->master = master; | |
85 | wheel->nexttime = period / slots; | |
86 | ||
87 | wheel->wheel_slot_lists = XCALLOC(MTYPE_TIMER_WHEEL_LIST, | |
88 | slots * sizeof (struct listnode *)); | |
89 | for (i = 0; i < slots; i++) | |
90 | wheel->wheel_slot_lists[i] = list_new (); | |
91 | ||
ffa2c898 QY |
92 | thread_add_timer_msec(wheel->master, wheel_timer_thread, wheel, |
93 | wheel->nexttime, &wheel->timer); | |
cbea8737 DS |
94 | |
95 | return wheel; | |
96 | } | |
97 | ||
98 | void | |
99 | wheel_delete (struct timer_wheel *wheel) | |
100 | { | |
101 | int i; | |
102 | ||
103 | for (i = 0; i < wheel->slots; i++) | |
104 | { | |
105 | list_delete(wheel->wheel_slot_lists[i]); | |
106 | } | |
107 | ||
108 | THREAD_OFF(wheel->timer); | |
109 | XFREE(MTYPE_TIMER_WHEEL_LIST, wheel->wheel_slot_lists); | |
110 | XFREE(MTYPE_TIMER_WHEEL, wheel); | |
111 | } | |
112 | ||
113 | int | |
114 | wheel_stop (struct timer_wheel *wheel) | |
115 | { | |
116 | THREAD_OFF(wheel->timer); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | int | |
121 | wheel_start (struct timer_wheel *wheel) | |
122 | { | |
123 | if (!wheel->timer) | |
ffa2c898 QY |
124 | thread_add_timer_msec(wheel->master, wheel_timer_thread, wheel, |
125 | wheel->nexttime, &wheel->timer); | |
cbea8737 DS |
126 | |
127 | return 0; | |
128 | } | |
129 | ||
130 | int | |
131 | wheel_add_item (struct timer_wheel *wheel, void *item) | |
132 | { | |
133 | long long slot; | |
134 | ||
135 | slot = (*wheel->slot_key)(item); | |
136 | ||
137 | if (debug_timer_wheel) | |
138 | zlog_debug ("%s: Inserting %p: %lld %lld", | |
139 | __PRETTY_FUNCTION__, item, | |
140 | slot, slot % wheel->slots); | |
141 | listnode_add (wheel->wheel_slot_lists[slot % wheel->slots], item); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | int | |
147 | wheel_remove_item (struct timer_wheel *wheel, void *item) | |
148 | { | |
149 | long long slot; | |
150 | ||
151 | slot = (*wheel->slot_key)(item); | |
152 | ||
153 | if (debug_timer_wheel) | |
154 | zlog_debug ("%s: Removing %p: %lld %lld", | |
155 | __PRETTY_FUNCTION__, item, | |
156 | slot, slot % wheel->slots); | |
157 | listnode_delete (wheel->wheel_slot_lists[slot % wheel->slots], item); | |
158 | ||
159 | return 0; | |
160 | } |