add timer module refer linux timer

This commit is contained in:
siddontang 2014-04-15 16:36:20 +08:00
parent e02d4a31aa
commit 5cd336a6a1
4 changed files with 415 additions and 0 deletions

34
timer/sleep.go Normal file
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package timer
import (
"time"
)
type Timer struct {
C <-chan time.Time
r *timer
}
func After(d time.Duration) <-chan time.Time {
return defaultWheel.After(d)
}
func Sleep(d time.Duration) {
defaultWheel.Sleep(d)
}
func AfterFunc(d time.Duration, f func()) *Timer {
return defaultWheel.AfterFunc(d, f)
}
func NewTimer(d time.Duration) *Timer {
return defaultWheel.NewTimer(d)
}
func (t *Timer) Reset(d time.Duration) {
t.r.w.resetTimer(t.r, d, 0)
}
func (t *Timer) Stop() {
t.r.w.delTimer(t.r)
}

30
timer/ticker.go Normal file
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package timer
import (
"time"
)
type Ticker struct {
C <-chan time.Time
r *timer
}
func NewTicker(d time.Duration) *Ticker {
return defaultWheel.NewTicker(d)
}
func TickFunc(d time.Duration, f func()) *Ticker {
return defaultWheel.TickFunc(d, f)
}
func Tick(d time.Duration) <-chan time.Time {
return defaultWheel.Tick(d)
}
func (t *Ticker) Stop() {
t.r.w.delTimer(t.r)
}
func (t *Ticker) Reset(d time.Duration) {
t.r.w.resetTimer(t.r, d, d)
}

308
timer/wheel.go Normal file
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package timer
import (
"sync"
"time"
)
const (
tvn_bits uint64 = 6
tvr_bits uint64 = 8
tvn_size uint64 = 64 //1 << tvn_bits
tvr_size uint64 = 256 //1 << tvr_bits
tvn_mask uint64 = 63 //tvn_size - 1
tvr_mask uint64 = 255 //tvr_size -1
)
const (
defaultTimerSize = 128
)
type timer struct {
expires uint64
period uint64
f func(time.Time, interface{})
arg interface{}
w *Wheel
vec []*timer
index int
}
type Wheel struct {
sync.Mutex
jiffies uint64
tv1 [][]*timer
tv2 [][]*timer
tv3 [][]*timer
tv4 [][]*timer
tv5 [][]*timer
tick time.Duration
quit chan struct{}
}
//tick is the time for a jiffies
func NewWheel(tick time.Duration) *Wheel {
w := new(Wheel)
w.quit = make(chan struct{})
f := func(size int) [][]*timer {
tv := make([][]*timer, size)
for i := range tv {
tv[i] = make([]*timer, 0, defaultTimerSize)
}
return tv
}
w.tv1 = f(int(tvr_size))
w.tv2 = f(int(tvn_size))
w.tv3 = f(int(tvn_size))
w.tv4 = f(int(tvn_size))
w.tv5 = f(int(tvn_size))
w.jiffies = 0
w.tick = tick
go w.run()
return w
}
func (w *Wheel) addTimerInternal(t *timer) {
idx := t.expires - w.jiffies
var tv [][]*timer
var i uint64
if idx < tvr_size {
i = t.expires & tvr_mask
tv = w.tv1
} else if idx < (1 << (tvr_bits + tvn_bits)) {
i = (t.expires >> tvr_bits) & tvn_mask
tv = w.tv2
} else if idx < (1 << (tvr_bits + 2*tvn_bits)) {
i = (t.expires >> (tvr_bits + tvn_bits)) & tvn_mask
tv = w.tv3
} else if idx < (1 << (tvr_bits + 3*tvn_bits)) {
i = (t.expires >> (tvr_bits + 2*tvn_bits)) & tvn_mask
tv = w.tv4
} else if int64(idx) < 0 {
i = w.jiffies & tvr_mask
tv = w.tv1
} else {
if idx > 0x00000000ffffffff {
idx = 0x00000000ffffffff
t.expires = idx + w.jiffies
}
i = (t.expires >> (tvr_bits + 3*tvn_bits)) & tvn_mask
tv = w.tv5
}
tv[i] = append(tv[i], t)
t.vec = tv[i]
t.index = len(tv[i]) - 1
}
func (w *Wheel) cascade(tv [][]*timer, index int) int {
vec := tv[index]
tv[index] = vec[0:0:defaultTimerSize]
for _, t := range vec {
w.addTimerInternal(t)
}
return index
}
func (w *Wheel) getIndex(n int) int {
return int((w.jiffies >> (tvr_bits + uint64(n)*tvn_bits)) & tvn_mask)
}
func (w *Wheel) onTick() {
w.Lock()
index := int(w.jiffies & tvr_mask)
if index == 0 && (w.cascade(w.tv2, w.getIndex(0))) == 0 &&
(w.cascade(w.tv3, w.getIndex(1))) == 0 &&
(w.cascade(w.tv4, w.getIndex(2))) == 0 &&
(w.cascade(w.tv5, w.getIndex(3)) == 0) {
}
w.jiffies++
vec := w.tv1[index]
w.tv1[index] = vec[0:0:defaultTimerSize]
w.Unlock()
f := func(vec []*timer) {
now := time.Now()
for _, t := range vec {
if t == nil {
continue
}
t.f(now, t.arg)
if t.period > 0 {
t.expires = t.period + w.jiffies
w.addTimer(t)
}
}
}
if len(vec) > 0 {
go f(vec)
}
}
func (w *Wheel) addTimer(t *timer) {
w.Lock()
w.addTimerInternal(t)
w.Unlock()
}
func (w *Wheel) delTimer(t *timer) {
w.Lock()
vec := t.vec
index := t.index
if len(vec) > index && vec[index] == t {
vec[index] = nil
}
w.Unlock()
}
func (w *Wheel) resetTimer(t *timer, when time.Duration, period time.Duration) {
w.delTimer(t)
t.expires = w.jiffies + uint64(when/w.tick)
t.period = uint64(period / w.tick)
w.addTimer(t)
}
func (w *Wheel) newTimer(when time.Duration, period time.Duration,
f func(time.Time, interface{}), arg interface{}) *timer {
t := new(timer)
t.expires = w.jiffies + uint64(when/w.tick)
t.period = uint64(period / w.tick)
t.f = f
t.arg = arg
t.w = w
return t
}
func (w *Wheel) run() {
ticker := time.NewTicker(w.tick)
defer ticker.Stop()
for {
select {
case <-ticker.C:
w.onTick()
case <-w.quit:
return
}
}
}
func (w *Wheel) Stop() {
close(w.quit)
}
func sendTime(t time.Time, arg interface{}) {
select {
case arg.(chan time.Time) <- t:
default:
}
}
func goFunc(t time.Time, arg interface{}) {
go arg.(func())()
}
func dummyFunc(t time.Time, arg interface{}) {
}
func (w *Wheel) After(d time.Duration) <-chan time.Time {
return w.NewTimer(d).C
}
func (w *Wheel) Sleep(d time.Duration) {
<-w.NewTimer(d).C
}
func (w *Wheel) Tick(d time.Duration) <-chan time.Time {
return w.NewTicker(d).C
}
func (w *Wheel) TickFunc(d time.Duration, f func()) *Ticker {
t := &Ticker{
r: w.newTimer(d, d, goFunc, f),
}
w.addTimer(t.r)
return t
}
func (w *Wheel) AfterFunc(d time.Duration, f func()) *Timer {
t := &Timer{
r: w.newTimer(d, 0, goFunc, f),
}
w.addTimer(t.r)
return t
}
func (w *Wheel) NewTimer(d time.Duration) *Timer {
c := make(chan time.Time, 1)
t := &Timer{
C: c,
r: w.newTimer(d, 0, sendTime, c),
}
w.addTimer(t.r)
return t
}
func (w *Wheel) NewTicker(d time.Duration) *Ticker {
c := make(chan time.Time, 1)
t := &Ticker{
C: c,
r: w.newTimer(d, d, sendTime, c),
}
w.addTimer(t.r)
return t
}
var defaultWheel *Wheel
func init() {
defaultWheel = NewWheel(500 * time.Millisecond)
}

43
timer/wheel_test.go Normal file
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package timer
import (
"testing"
"time"
)
var testWheel = NewWheel(100 * time.Millisecond)
func TestTimer(t *testing.T) {
t1 := testWheel.NewTimer(500 * time.Millisecond)
before := time.Now()
<-t1.C
after := time.Now()
println(after.Sub(before).String())
}
func TestTicker(t *testing.T) {
wait := make(chan struct{}, 100)
i := 0
f := func() {
println(time.Now().Unix())
i++
if i >= 10 {
wait <- struct{}{}
}
}
before := time.Now()
t1 := testWheel.TickFunc(1000*time.Millisecond, f)
<-wait
t1.Stop()
after := time.Now()
println(after.Sub(before).String())
}