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de452ad | 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 | // Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package race_test
import (
"sync"
"testing"
"time"
)
func TestRaceMutexRWMutex(t *testing.T) {
var mu1 sync.Mutex
var mu2 sync.RWMutex
var x int16 = 0
_ = x
ch := make(chan bool, 2)
go func() {
mu1.Lock()
defer mu1.Unlock()
x = 1
ch <- true
}()
go func() {
mu2.Lock()
x = 2
mu2.Unlock()
ch <- true
}()
<-ch
<-ch
}
func TestNoRaceRWMutex(t *testing.T) {
var mu sync.RWMutex
var x, y int64 = 0, 1
_ = y
ch := make(chan bool, 2)
go func() {
mu.Lock()
defer mu.Unlock()
x = 2
ch <- true
}()
go func() {
mu.RLock()
y = x
mu.RUnlock()
ch <- true
}()
<-ch
<-ch
}
func TestRaceRWMutexMultipleReaders(t *testing.T) {
var mu sync.RWMutex
var x, y int64 = 0, 1
ch := make(chan bool, 4)
go func() {
mu.Lock()
defer mu.Unlock()
x = 2
ch <- true
}()
// Use three readers so that no matter what order they're
// scheduled in, two will be on the same side of the write
// lock above.
go func() {
mu.RLock()
y = x + 1
mu.RUnlock()
ch <- true
}()
go func() {
mu.RLock()
y = x + 2
mu.RUnlock()
ch <- true
}()
go func() {
mu.RLock()
y = x + 3
mu.RUnlock()
ch <- true
}()
<-ch
<-ch
<-ch
<-ch
_ = y
}
func TestNoRaceRWMutexMultipleReaders(t *testing.T) {
var mu sync.RWMutex
x := int64(0)
ch := make(chan bool, 4)
go func() {
mu.Lock()
defer mu.Unlock()
x = 2
ch <- true
}()
go func() {
mu.RLock()
y := x + 1
_ = y
mu.RUnlock()
ch <- true
}()
go func() {
mu.RLock()
y := x + 2
_ = y
mu.RUnlock()
ch <- true
}()
go func() {
mu.RLock()
y := x + 3
_ = y
mu.RUnlock()
ch <- true
}()
<-ch
<-ch
<-ch
<-ch
}
func TestNoRaceRWMutexTransitive(t *testing.T) {
var mu sync.RWMutex
x := int64(0)
ch := make(chan bool, 2)
go func() {
mu.RLock()
_ = x
mu.RUnlock()
ch <- true
}()
go func() {
time.Sleep(1e7)
mu.RLock()
_ = x
mu.RUnlock()
ch <- true
}()
time.Sleep(2e7)
mu.Lock()
x = 42
mu.Unlock()
<-ch
<-ch
}
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