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
|
// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
//go:build go1.13 && !go1.19
package syncs
import (
"sync"
"testing"
"time"
)
func wantPanic(t *testing.T, fn func()) {
t.Helper()
defer func() {
recover()
}()
fn()
t.Fatal("failed to panic")
}
func TestAssertLocked(t *testing.T) {
m := new(sync.Mutex)
wantPanic(t, func() { AssertLocked(m) })
m.Lock()
AssertLocked(m)
m.Unlock()
wantPanic(t, func() { AssertLocked(m) })
// Test correct handling of mutex with waiter.
m.Lock()
AssertLocked(m)
go func() {
m.Lock()
m.Unlock()
}()
// Give the goroutine above a few moments to get started.
// The test will pass whether or not we win the race,
// but we want to run sometimes, to get the test coverage.
time.Sleep(10 * time.Millisecond)
AssertLocked(m)
}
func TestAssertWLocked(t *testing.T) {
m := new(sync.RWMutex)
wantPanic(t, func() { AssertWLocked(m) })
m.Lock()
AssertWLocked(m)
m.Unlock()
wantPanic(t, func() { AssertWLocked(m) })
// Test correct handling of mutex with waiter.
m.Lock()
AssertWLocked(m)
go func() {
m.Lock()
m.Unlock()
}()
// Give the goroutine above a few moments to get started.
// The test will pass whether or not we win the race,
// but we want to run sometimes, to get the test coverage.
time.Sleep(10 * time.Millisecond)
AssertWLocked(m)
}
func TestAssertRLocked(t *testing.T) {
m := new(sync.RWMutex)
wantPanic(t, func() { AssertRLocked(m) })
m.Lock()
AssertRLocked(m)
m.Unlock()
m.RLock()
AssertRLocked(m)
m.RUnlock()
wantPanic(t, func() { AssertRLocked(m) })
// Test correct handling of mutex with waiter.
m.RLock()
AssertRLocked(m)
go func() {
m.RLock()
m.RUnlock()
}()
// Give the goroutine above a few moments to get started.
// The test will pass whether or not we win the race,
// but we want to run sometimes, to get the test coverage.
time.Sleep(10 * time.Millisecond)
AssertRLocked(m)
m.RUnlock()
// Test correct handling of rlock with write waiter.
m.RLock()
AssertRLocked(m)
go func() {
m.Lock()
m.Unlock()
}()
// Give the goroutine above a few moments to get started.
// The test will pass whether or not we win the race,
// but we want to run sometimes, to get the test coverage.
time.Sleep(10 * time.Millisecond)
AssertRLocked(m)
m.RUnlock()
// Test correct handling of rlock with other rlocks.
// This is a bit racy, but losing the race hurts nothing,
// and winning the race means correct test coverage.
m.RLock()
AssertRLocked(m)
go func() {
m.RLock()
time.Sleep(10 * time.Millisecond)
m.RUnlock()
}()
time.Sleep(5 * time.Millisecond)
AssertRLocked(m)
m.RUnlock()
}
|
