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
|
package missinggo
import "sync"
// Events are boolean flags that provide a channel that's closed when true.
// This could go in the sync package, but that's more of a debug wrapper on
// the standard library sync.
type Event struct {
ch chan struct{}
closed bool
}
func (me *Event) LockedChan(lock sync.Locker) <-chan struct{} {
lock.Lock()
ch := me.C()
lock.Unlock()
return ch
}
// Returns a chan that is closed when the event is true.
func (me *Event) C() <-chan struct{} {
if me.ch == nil {
me.ch = make(chan struct{})
}
return me.ch
}
// TODO: Merge into Set.
func (me *Event) Clear() {
if me.closed {
me.ch = nil
me.closed = false
}
}
// Set the event to true/on.
func (me *Event) Set() (first bool) {
if me.closed {
return false
}
if me.ch == nil {
me.ch = make(chan struct{})
}
close(me.ch)
me.closed = true
return true
}
// TODO: Change to Get.
func (me *Event) IsSet() bool {
return me.closed
}
func (me *Event) Wait() {
<-me.C()
}
// TODO: Merge into Set.
func (me *Event) SetBool(b bool) {
if b {
me.Set()
} else {
me.Clear()
}
}
|
