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
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package device
import (
"runtime"
"sync"
)
// An outboundQueue is a channel of QueueOutboundElements awaiting encryption.
// An outboundQueue is ref-counted using its wg field.
// An outboundQueue created with newOutboundQueue has one reference.
// Every additional writer must call wg.Add(1).
// Every completed writer must call wg.Done().
// When no further writers will be added,
// call wg.Done to remove the initial reference.
// When the refcount hits 0, the queue's channel is closed.
type outboundQueue struct {
c chan *QueueOutboundElement
wg sync.WaitGroup
}
func newOutboundQueue() *outboundQueue {
q := &outboundQueue{
c: make(chan *QueueOutboundElement, QueueOutboundSize),
}
q.wg.Add(1)
go func() {
q.wg.Wait()
close(q.c)
}()
return q
}
// A inboundQueue is similar to an outboundQueue; see those docs.
type inboundQueue struct {
c chan *QueueInboundElement
wg sync.WaitGroup
}
func newInboundQueue() *inboundQueue {
q := &inboundQueue{
c: make(chan *QueueInboundElement, QueueInboundSize),
}
q.wg.Add(1)
go func() {
q.wg.Wait()
close(q.c)
}()
return q
}
// A handshakeQueue is similar to an outboundQueue; see those docs.
type handshakeQueue struct {
c chan QueueHandshakeElement
wg sync.WaitGroup
}
func newHandshakeQueue() *handshakeQueue {
q := &handshakeQueue{
c: make(chan QueueHandshakeElement, QueueHandshakeSize),
}
q.wg.Add(1)
go func() {
q.wg.Wait()
close(q.c)
}()
return q
}
type autodrainingInboundQueue struct {
c chan *QueueInboundElement
}
// newAutodrainingInboundQueue returns a channel that will be drained when it gets GC'd.
// It is useful in cases in which is it hard to manage the lifetime of the channel.
// The returned channel must not be closed. Senders should signal shutdown using
// some other means, such as sending a sentinel nil values.
func newAutodrainingInboundQueue(device *Device) *autodrainingInboundQueue {
q := &autodrainingInboundQueue{
c: make(chan *QueueInboundElement, QueueInboundSize),
}
runtime.SetFinalizer(q, device.flushInboundQueue)
return q
}
func (device *Device) flushInboundQueue(q *autodrainingInboundQueue) {
for {
select {
case elem := <-q.c:
elem.Lock()
device.PutMessageBuffer(elem.buffer)
device.PutInboundElement(elem)
default:
return
}
}
}
type autodrainingOutboundQueue struct {
c chan *QueueOutboundElement
}
// newAutodrainingOutboundQueue returns a channel that will be drained when it gets GC'd.
// It is useful in cases in which is it hard to manage the lifetime of the channel.
// The returned channel must not be closed. Senders should signal shutdown using
// some other means, such as sending a sentinel nil values.
// All sends to the channel must be best-effort, because there may be no receivers.
func newAutodrainingOutboundQueue(device *Device) *autodrainingOutboundQueue {
q := &autodrainingOutboundQueue{
c: make(chan *QueueOutboundElement, QueueOutboundSize),
}
runtime.SetFinalizer(q, device.flushOutboundQueue)
return q
}
func (device *Device) flushOutboundQueue(q *autodrainingOutboundQueue) {
for {
select {
case elem := <-q.c:
elem.Lock()
device.PutMessageBuffer(elem.buffer)
device.PutOutboundElement(elem)
default:
return
}
}
}
|
