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
108
109
110
111
112
113
114
115
116
117
118
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Function.h>
#include <AK/IntrusiveList.h>
#include <AK/NonnullRefPtr.h>
#include <AK/OwnPtr.h>
#include <AK/RefCounted.h>
#include <AK/Time.h>
#include <Kernel/Time/TimeManagement.h>
namespace Kernel {
TYPEDEF_DISTINCT_ORDERED_ID(u64, TimerId);
class Timer : public RefCounted<Timer> {
friend class TimerQueue;
public:
void setup(clockid_t clock_id, Time expires, Function<void()>&& callback)
{
VERIFY(!is_queued());
m_clock_id = clock_id;
m_expires = expires;
m_callback = move(callback);
}
~Timer()
{
VERIFY(!is_queued());
}
Time remaining() const;
private:
TimerId m_id;
clockid_t m_clock_id;
Time m_expires;
Time m_remaining {};
Function<void()> m_callback;
Atomic<bool, AK::MemoryOrder::memory_order_relaxed> m_queued { false };
bool operator<(const Timer& rhs) const
{
return m_expires < rhs.m_expires;
}
bool operator>(const Timer& rhs) const
{
return m_expires > rhs.m_expires;
}
bool operator==(const Timer& rhs) const
{
return m_id == rhs.m_id;
}
bool is_queued() const { return m_queued; }
void set_queued(bool queued) { m_queued = queued; }
Time now(bool) const;
public:
IntrusiveListNode<Timer> m_list_node;
using List = IntrusiveList<Timer, RawPtr<Timer>, &Timer::m_list_node>;
};
class TimerQueue {
friend class Timer;
public:
TimerQueue();
static TimerQueue& the();
TimerId add_timer(NonnullRefPtr<Timer>&&);
bool add_timer_without_id(NonnullRefPtr<Timer>, clockid_t, const Time&, Function<void()>&&);
TimerId add_timer(clockid_t, const Time& timeout, Function<void()>&& callback);
bool cancel_timer(TimerId id);
bool cancel_timer(Timer&);
bool cancel_timer(NonnullRefPtr<Timer>&& timer)
{
return cancel_timer(*move(timer));
}
void fire();
private:
struct Queue {
Timer::List list;
Time next_timer_due {};
};
void remove_timer_locked(Queue&, Timer&);
void update_next_timer_due(Queue&);
void add_timer_locked(NonnullRefPtr<Timer>);
Queue& queue_for_timer(Timer& timer)
{
switch (timer.m_clock_id) {
case CLOCK_MONOTONIC:
case CLOCK_MONOTONIC_COARSE:
case CLOCK_MONOTONIC_RAW:
return m_timer_queue_monotonic;
case CLOCK_REALTIME:
case CLOCK_REALTIME_COARSE:
return m_timer_queue_realtime;
default:
VERIFY_NOT_REACHED();
}
}
u64 m_timer_id_count { 0 };
u64 m_ticks_per_second { 0 };
Queue m_timer_queue_monotonic;
Queue m_timer_queue_realtime;
Timer::List m_timers_executing;
};
}
|
