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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gate_test
import (
"sync"
"testing"
"time"
"gvisor.dev/gvisor/pkg/gate"
)
func TestBasicEnter(t *testing.T) {
var g gate.Gate
if !g.Enter() {
t.Fatalf("Failed to enter when it should be allowed")
}
g.Leave()
g.Close()
if g.Enter() {
t.Fatalf("Allowed to enter when it should fail")
}
}
func enterFunc(t *testing.T, g *gate.Gate, enter, leave, reenter chan struct{}, done1, done2, done3 *sync.WaitGroup) {
// Wait until instructed to enter.
<-enter
if !g.Enter() {
t.Errorf("Failed to enter when it should be allowed")
}
done1.Done()
// Wait until instructed to leave.
<-leave
g.Leave()
done2.Done()
// Wait until instructed to reenter.
<-reenter
if g.Enter() {
t.Errorf("Allowed to enter when it should fail")
}
done3.Done()
}
func TestConcurrentEnter(t *testing.T) {
var g gate.Gate
var done1, done2, done3 sync.WaitGroup
// Create 1000 worker goroutines.
enter := make(chan struct{})
leave := make(chan struct{})
reenter := make(chan struct{})
done1.Add(1000)
done2.Add(1000)
done3.Add(1000)
for i := 0; i < 1000; i++ {
go enterFunc(t, &g, enter, leave, reenter, &done1, &done2, &done3)
}
// Tell them all to enter, then leave.
close(enter)
done1.Wait()
close(leave)
done2.Wait()
// Close the gate, then have the workers try to enter again.
g.Close()
close(reenter)
done3.Wait()
}
func closeFunc(g *gate.Gate, done chan struct{}) {
g.Close()
close(done)
}
func TestCloseWaits(t *testing.T) {
var g gate.Gate
// Enter 10 times.
for i := 0; i < 10; i++ {
if !g.Enter() {
t.Fatalf("Failed to enter when it should be allowed")
}
}
// Launch closer. Check that it doesn't complete.
done := make(chan struct{})
go closeFunc(&g, done)
for i := 0; i < 10; i++ {
select {
case <-done:
t.Fatalf("Close function completed too soon")
case <-time.After(100 * time.Millisecond):
}
g.Leave()
}
// Now the closer must complete.
<-done
}
func TestMultipleSerialCloses(t *testing.T) {
var g gate.Gate
// Enter 10 times.
for i := 0; i < 10; i++ {
if !g.Enter() {
t.Fatalf("Failed to enter when it should be allowed")
}
}
// Launch closer. Check that it doesn't complete.
done := make(chan struct{})
go closeFunc(&g, done)
for i := 0; i < 10; i++ {
select {
case <-done:
t.Fatalf("Close function completed too soon")
case <-time.After(100 * time.Millisecond):
}
g.Leave()
}
// Now the closer must complete.
<-done
// Close again should not block.
done = make(chan struct{})
go closeFunc(&g, done)
select {
case <-done:
case <-time.After(2 * time.Second):
t.Fatalf("Second Close is blocking")
}
}
func worker(g *gate.Gate, done *sync.WaitGroup) {
for {
if !g.Enter() {
break
}
g.Leave()
}
done.Done()
}
func TestConcurrentAll(t *testing.T) {
var g gate.Gate
var done sync.WaitGroup
// Launch 1000 goroutines to concurrently enter/leave.
done.Add(1000)
for i := 0; i < 1000; i++ {
go worker(&g, &done)
}
// Wait for the goroutines to do some work, then close the gate.
time.Sleep(2 * time.Second)
g.Close()
// Wait for all of them to complete.
done.Wait()
}
|
