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
|
/*
* Copyright (c) 2017-2018 Richard Braun.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdint.h>
#include <kern/bulletin.h>
#include <kern/list.h>
#include <kern/rcu.h>
#include <kern/spinlock.h>
#include <kern/thread.h>
static void
bulletin_sub_init(struct bulletin_sub *sub,
bulletin_notif_fn_t notif_fn, void *arg)
{
sub->notif_fn = notif_fn;
sub->arg = arg;
}
static void
bulletin_sub_notify(const struct bulletin_sub *sub, uintptr_t value)
{
sub->notif_fn(value, sub->arg);
}
void
bulletin_init(struct bulletin *bulletin)
{
spinlock_init(&bulletin->lock);
list_init(&bulletin->subs);
}
void
bulletin_subscribe(struct bulletin *bulletin, struct bulletin_sub *sub,
bulletin_notif_fn_t notif_fn, void *arg)
{
bulletin_sub_init(sub, notif_fn, arg);
spinlock_lock(&bulletin->lock);
list_rcu_insert_tail(&bulletin->subs, &sub->node);
spinlock_unlock(&bulletin->lock);
}
void
bulletin_unsubscribe(struct bulletin *bulletin, struct bulletin_sub *sub)
{
spinlock_lock(&bulletin->lock);
list_rcu_remove(&sub->node);
spinlock_unlock(&bulletin->lock);
rcu_wait();
}
void
bulletin_publish(struct bulletin *bulletin, uintptr_t value)
{
struct bulletin_sub *sub;
assert(!thread_interrupted());
rcu_read_enter();
list_rcu_for_each_entry(&bulletin->subs, sub, node) {
bulletin_sub_notify(sub, value);
}
rcu_read_leave();
}
|
