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 2009 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 time_test
import (
"fmt"
"os"
"syscall"
"testing"
"sort"
. "time"
)
func TestSleep(t *testing.T) {
const delay = int64(100e6)
go func() {
Sleep(delay / 2)
syscall.Kill(os.Getpid(), syscall.SIGCHLD)
}()
start := Nanoseconds()
Sleep(delay)
duration := Nanoseconds() - start
if duration < delay {
t.Fatalf("Sleep(%d) slept for only %d ns", delay, duration)
}
}
// Test the basic function calling behavior. Correct queueing
// behavior is tested elsewhere, since After and AfterFunc share
// the same code.
func TestAfterFunc(t *testing.T) {
i := 10
c := make(chan bool)
var f func()
f = func() {
i--
if i >= 0 {
AfterFunc(0, f)
Sleep(1e9)
} else {
c <- true
}
}
AfterFunc(0, f)
<-c
}
func BenchmarkAfterFunc(b *testing.B) {
i := b.N
c := make(chan bool)
var f func()
f = func() {
i--
if i >= 0 {
AfterFunc(0, f)
} else {
c <- true
}
}
AfterFunc(0, f)
<-c
}
func BenchmarkAfter(b *testing.B) {
for i := 0; i < b.N; i++ {
<-After(1)
}
}
func BenchmarkStop(b *testing.B) {
for i := 0; i < b.N; i++ {
NewTimer(1e9).Stop()
}
}
func TestAfter(t *testing.T) {
const delay = int64(100e6)
start := Nanoseconds()
end := <-After(delay)
if duration := Nanoseconds() - start; duration < delay {
t.Fatalf("After(%d) slept for only %d ns", delay, duration)
}
if min := start + delay; end < min {
t.Fatalf("After(%d) expect >= %d, got %d", delay, min, end)
}
}
func TestAfterTick(t *testing.T) {
const (
Delta = 100 * 1e6
Count = 10
)
t0 := Nanoseconds()
for i := 0; i < Count; i++ {
<-After(Delta)
}
t1 := Nanoseconds()
ns := t1 - t0
target := int64(Delta * Count)
slop := target * 2 / 10
if ns < target-slop || ns > target+slop {
t.Fatalf("%d ticks of %g ns took %g ns, expected %g", Count, float64(Delta), float64(ns), float64(target))
}
}
func TestAfterStop(t *testing.T) {
const msec = 1e6
AfterFunc(100*msec, func() {})
t0 := NewTimer(50 * msec)
c1 := make(chan bool, 1)
t1 := AfterFunc(150*msec, func() { c1 <- true })
c2 := After(200 * msec)
if !t0.Stop() {
t.Fatalf("failed to stop event 0")
}
if !t1.Stop() {
t.Fatalf("failed to stop event 1")
}
<-c2
select {
case <-t0.C:
t.Fatalf("event 0 was not stopped")
case <-c1:
t.Fatalf("event 1 was not stopped")
default:
}
if t1.Stop() {
t.Fatalf("Stop returned true twice")
}
}
func TestAfterQueuing(t *testing.T) {
// This test flakes out on some systems,
// so we'll try it a few times before declaring it a failure.
const attempts = 3
err := os.NewError("!=nil")
for i := 0; i < attempts && err != nil; i++ {
if err = testAfterQueuing(t); err != nil {
t.Logf("attempt %v failed: %v", i, err)
}
}
if err != nil {
t.Fatal(err)
}
}
var slots = []int{5, 3, 6, 6, 6, 1, 1, 2, 7, 9, 4, 8, 0}
type afterResult struct {
slot int
t int64
}
func await(slot int, result chan<- afterResult, ac <-chan int64) {
result <- afterResult{slot, <-ac}
}
func testAfterQueuing(t *testing.T) os.Error {
const (
Delta = 100 * 1e6
)
// make the result channel buffered because we don't want
// to depend on channel queueing semantics that might
// possibly change in the future.
result := make(chan afterResult, len(slots))
t0 := Nanoseconds()
for _, slot := range slots {
go await(slot, result, After(int64(slot)*Delta))
}
sort.Ints(slots)
for _, slot := range slots {
r := <-result
if r.slot != slot {
return fmt.Errorf("after queue got slot %d, expected %d", r.slot, slot)
}
ns := r.t - t0
target := int64(slot * Delta)
slop := int64(Delta) / 4
if ns < target-slop || ns > target+slop {
return fmt.Errorf("after queue slot %d arrived at %g, expected [%g,%g]", slot, float64(ns), float64(target-slop), float64(target+slop))
}
}
return nil
}
|
