-
-
Notifications
You must be signed in to change notification settings - Fork 758
Expand file tree
/
Copy pathtimers.js
More file actions
99 lines (83 loc) · 1.85 KB
/
timers.js
File metadata and controls
99 lines (83 loc) · 1.85 KB
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
'use strict'
const TICK_MS = 499
let fastNow = Date.now()
let fastNowTimeout
const fastTimers = []
function onTimeout () {
fastNow = Date.now()
let len = fastTimers.length
let idx = 0
while (idx < len) {
const timer = fastTimers[idx]
if (timer.state === 0) {
timer.state = fastNow + timer.delay - TICK_MS
} else if (timer.state > 0 && fastNow >= timer.state) {
timer.state = -1
timer.callback(timer.opaque)
}
if (timer.state === -1) {
timer.state = -2
if (idx !== len - 1) {
fastTimers[idx] = fastTimers.pop()
} else {
fastTimers.pop()
}
len -= 1
} else {
idx += 1
}
}
if (fastTimers.length > 0) {
refreshTimeout()
}
}
function refreshTimeout () {
if (fastNowTimeout?.refresh) {
fastNowTimeout.refresh()
} else {
clearTimeout(fastNowTimeout)
fastNowTimeout = setTimeout(onTimeout, TICK_MS)
if (fastNowTimeout.unref) {
fastNowTimeout.unref()
}
}
}
class Timeout {
constructor (callback, delay, opaque) {
this.callback = callback
this.delay = delay
this.opaque = opaque
// -2 not in timer list
// -1 in timer list but inactive
// 0 in timer list waiting for time
// > 0 in timer list waiting for time to expire
this.state = -2
this.refresh()
}
refresh () {
if (this.state === -2) {
fastTimers.push(this)
if (!fastNowTimeout || fastTimers.length === 1) {
refreshTimeout()
}
}
this.state = 0
}
clear () {
this.state = -1
}
}
module.exports = {
setTimeout (callback, delay, opaque) {
return delay <= 1e3
? setTimeout(callback, delay, opaque)
: new Timeout(callback, delay, opaque)
},
clearTimeout (timeout) {
if (timeout instanceof Timeout) {
timeout.clear()
} else {
clearTimeout(timeout)
}
}
}