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git.proxmox.com Git - mirror_frr.git/blob - lib/wheel.c
3 * Copyright (C) 2016 Cumulus Networks, Inc.
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.
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.
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
27 DEFINE_MTYPE_STATIC(LIB
, TIMER_WHEEL
, "Timer Wheel")
28 DEFINE_MTYPE_STATIC(LIB
, TIMER_WHEEL_LIST
, "Timer Wheel Slot List")
30 static int debug_timer_wheel
= 0;
33 wheel_timer_thread (struct thread
*t
)
35 struct listnode
*node
, *nextnode
;
36 unsigned long long curr_slot
;
37 unsigned int slots_to_skip
= 1;
38 struct timer_wheel
*wheel
;
41 wheel
= THREAD_ARG(t
);
42 THREAD_OFF(wheel
->timer
);
44 wheel
->curr_slot
+= wheel
->slots_to_skip
;
46 curr_slot
= wheel
->curr_slot
% wheel
->slots
;
48 if (debug_timer_wheel
)
49 zlog_debug ("%s: Wheel Slot: %lld(%lld) count: %d",
52 curr_slot
, listcount(wheel
->wheel_slot_lists
[curr_slot
]));
54 for (ALL_LIST_ELEMENTS (wheel
->wheel_slot_lists
[curr_slot
], node
, nextnode
, data
))
55 (*wheel
->slot_run
)(data
);
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
)
61 wheel
->slots_to_skip
= slots_to_skip
;
62 thread_add_timer_msec(wheel
->master
, wheel_timer_thread
, wheel
,
63 wheel
->nexttime
* slots_to_skip
, &wheel
->timer
);
69 wheel_init (struct thread_master
*master
, int period
, size_t slots
,
70 unsigned int (*slot_key
) (void *),
71 void (*slot_run
) (void *))
73 struct timer_wheel
*wheel
;
76 wheel
= XCALLOC(MTYPE_TIMER_WHEEL
, sizeof (struct timer_wheel
));
78 wheel
->slot_key
= slot_key
;
79 wheel
->slot_run
= slot_run
;
81 wheel
->period
= period
;
84 wheel
->master
= master
;
85 wheel
->nexttime
= period
/ slots
;
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 ();
92 thread_add_timer_msec(wheel
->master
, wheel_timer_thread
, wheel
,
93 wheel
->nexttime
, &wheel
->timer
);
99 wheel_delete (struct timer_wheel
*wheel
)
103 for (i
= 0; i
< wheel
->slots
; i
++)
105 list_delete(wheel
->wheel_slot_lists
[i
]);
108 THREAD_OFF(wheel
->timer
);
109 XFREE(MTYPE_TIMER_WHEEL_LIST
, wheel
->wheel_slot_lists
);
110 XFREE(MTYPE_TIMER_WHEEL
, wheel
);
114 wheel_stop (struct timer_wheel
*wheel
)
116 THREAD_OFF(wheel
->timer
);
121 wheel_start (struct timer_wheel
*wheel
)
124 thread_add_timer_msec(wheel
->master
, wheel_timer_thread
, wheel
,
125 wheel
->nexttime
, &wheel
->timer
);
131 wheel_add_item (struct timer_wheel
*wheel
, void *item
)
135 slot
= (*wheel
->slot_key
)(item
);
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
);
147 wheel_remove_item (struct timer_wheel
*wheel
, void *item
)
151 slot
= (*wheel
->slot_key
)(item
);
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
);