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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
|
// Copyright 2011 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 (
"runtime"
"sync"
"sync/atomic"
"testing"
"unsafe"
)
func TestNoRaceAtomicAddInt64(t *testing.T) {
var x1, x2 int8
_ = x1 + x2
var s int64
ch := make(chan bool, 2)
go func() {
x1 = 1
if atomic.AddInt64(&s, 1) == 2 {
x2 = 1
}
ch <- true
}()
go func() {
x2 = 1
if atomic.AddInt64(&s, 1) == 2 {
x1 = 1
}
ch <- true
}()
<-ch
<-ch
}
func TestRaceAtomicAddInt64(t *testing.T) {
var x1, x2 int8
_ = x1 + x2
var s int64
ch := make(chan bool, 2)
go func() {
x1 = 1
if atomic.AddInt64(&s, 1) == 1 {
x2 = 1
}
ch <- true
}()
go func() {
x2 = 1
if atomic.AddInt64(&s, 1) == 1 {
x1 = 1
}
ch <- true
}()
<-ch
<-ch
}
func TestNoRaceAtomicAddInt32(t *testing.T) {
var x1, x2 int8
_ = x1 + x2
var s int32
ch := make(chan bool, 2)
go func() {
x1 = 1
if atomic.AddInt32(&s, 1) == 2 {
x2 = 1
}
ch <- true
}()
go func() {
x2 = 1
if atomic.AddInt32(&s, 1) == 2 {
x1 = 1
}
ch <- true
}()
<-ch
<-ch
}
func TestNoRaceAtomicLoadAddInt32(t *testing.T) {
var x int64
_ = x
var s int32
go func() {
x = 2
atomic.AddInt32(&s, 1)
}()
for atomic.LoadInt32(&s) != 1 {
runtime.Gosched()
}
x = 1
}
func TestNoRaceAtomicLoadStoreInt32(t *testing.T) {
var x int64
_ = x
var s int32
go func() {
x = 2
atomic.StoreInt32(&s, 1)
}()
for atomic.LoadInt32(&s) != 1 {
runtime.Gosched()
}
x = 1
}
func TestNoRaceAtomicStoreCASInt32(t *testing.T) {
var x int64
_ = x
var s int32
go func() {
x = 2
atomic.StoreInt32(&s, 1)
}()
for !atomic.CompareAndSwapInt32(&s, 1, 0) {
runtime.Gosched()
}
x = 1
}
func TestNoRaceAtomicCASLoadInt32(t *testing.T) {
var x int64
_ = x
var s int32
go func() {
x = 2
if !atomic.CompareAndSwapInt32(&s, 0, 1) {
panic("")
}
}()
for atomic.LoadInt32(&s) != 1 {
runtime.Gosched()
}
x = 1
}
func TestNoRaceAtomicCASCASInt32(t *testing.T) {
var x int64
_ = x
var s int32
go func() {
x = 2
if !atomic.CompareAndSwapInt32(&s, 0, 1) {
panic("")
}
}()
for !atomic.CompareAndSwapInt32(&s, 1, 0) {
runtime.Gosched()
}
x = 1
}
func TestNoRaceAtomicCASCASInt32_2(t *testing.T) {
var x1, x2 int8
_ = x1 + x2
var s int32
ch := make(chan bool, 2)
go func() {
x1 = 1
if !atomic.CompareAndSwapInt32(&s, 0, 1) {
x2 = 1
}
ch <- true
}()
go func() {
x2 = 1
if !atomic.CompareAndSwapInt32(&s, 0, 1) {
x1 = 1
}
ch <- true
}()
<-ch
<-ch
}
func TestNoRaceAtomicLoadInt64(t *testing.T) {
var x int32
_ = x
var s int64
go func() {
x = 2
atomic.AddInt64(&s, 1)
}()
for atomic.LoadInt64(&s) != 1 {
runtime.Gosched()
}
x = 1
}
func TestNoRaceAtomicCASCASUInt64(t *testing.T) {
var x int64
_ = x
var s uint64
go func() {
x = 2
if !atomic.CompareAndSwapUint64(&s, 0, 1) {
panic("")
}
}()
for !atomic.CompareAndSwapUint64(&s, 1, 0) {
runtime.Gosched()
}
x = 1
}
func TestNoRaceAtomicLoadStorePointer(t *testing.T) {
var x int64
_ = x
var s unsafe.Pointer
var y int = 2
var p unsafe.Pointer = unsafe.Pointer(&y)
go func() {
x = 2
atomic.StorePointer(&s, p)
}()
for atomic.LoadPointer(&s) != p {
runtime.Gosched()
}
x = 1
}
func TestNoRaceAtomicStoreCASUint64(t *testing.T) {
var x int64
_ = x
var s uint64
go func() {
x = 2
atomic.StoreUint64(&s, 1)
}()
for !atomic.CompareAndSwapUint64(&s, 1, 0) {
runtime.Gosched()
}
x = 1
}
func TestRaceAtomicStoreLoad(t *testing.T) {
c := make(chan bool)
var a uint64
go func() {
atomic.StoreUint64(&a, 1)
c <- true
}()
_ = a
<-c
}
func TestRaceAtomicLoadStore(t *testing.T) {
c := make(chan bool)
var a uint64
go func() {
_ = atomic.LoadUint64(&a)
c <- true
}()
a = 1
<-c
}
func TestRaceAtomicAddLoad(t *testing.T) {
c := make(chan bool)
var a uint64
go func() {
atomic.AddUint64(&a, 1)
c <- true
}()
_ = a
<-c
}
func TestRaceAtomicAddStore(t *testing.T) {
c := make(chan bool)
var a uint64
go func() {
atomic.AddUint64(&a, 1)
c <- true
}()
a = 42
<-c
}
// A nil pointer in an atomic operation should not deadlock
// the rest of the program. Used to hang indefinitely.
func TestNoRaceAtomicCrash(t *testing.T) {
var mutex sync.Mutex
var nilptr *int32
panics := 0
defer func() {
if x := recover(); x != nil {
mutex.Lock()
panics++
mutex.Unlock()
} else {
panic("no panic")
}
}()
atomic.AddInt32(nilptr, 1)
}
func TestNoRaceDeferAtomicStore(t *testing.T) {
// Test that when an atomic function is deferred directly, the
// GC scans it correctly. See issue 42599.
type foo struct {
bar int64
}
var doFork func(f *foo, depth int)
doFork = func(f *foo, depth int) {
atomic.StoreInt64(&f.bar, 1)
defer atomic.StoreInt64(&f.bar, 0)
if depth > 0 {
for i := 0; i < 2; i++ {
f2 := &foo{}
go doFork(f2, depth-1)
}
}
runtime.GC()
}
f := &foo{}
doFork(f, 11)
}
|
