/
eventloop.go
136 lines (122 loc) · 2.26 KB
/
eventloop.go
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package liblpc
import (
"container/list"
"context"
"github.com/gen-iot/std"
"io"
"sync/atomic"
)
type EventLoop interface {
io.Closer
RunInLoop(cb func())
Notify()
Run(ctx context.Context)
Break()
Poller() Poller
}
type evtLoop struct {
poller Poller
notify *NotifyWatcher
cbQ *list.List
lock *SpinLock
closeFlag int32
stopFlag int32
endRunSig chan struct{}
}
func NewEventLoop() (EventLoop, error) {
poller, err := NewEpoll(1024)
if err != nil {
return nil, err
}
return NewEventLoop2(poller)
}
func NewEventLoop2(poller Poller) (EventLoop, error) {
var err error = nil
l := new(evtLoop)
//
l.poller = poller
//
l.notify, err = NewNotifyWatcher(l, l.onWakeUp)
if err != nil {
std.CloseIgnoreErr(l.poller)
return nil, err
}
l.notify.Update(true)
//
l.cbQ = list.New()
l.lock = NewSpinLock()
l.closeFlag = 0
l.stopFlag = 0
l.endRunSig = make(chan struct{})
return l, nil
}
func (this *evtLoop) RunInLoop(cb func()) {
if atomic.LoadInt32(&this.stopFlag) == 1 {
cb()
return
}
this.lock.Lock()
this.cbQ.PushBack(cb)
this.lock.Unlock()
this.Notify()
}
func (this *evtLoop) Notify() {
this.notify.Notify()
}
func (this *evtLoop) onWakeUp() {
this.processPending()
}
func (this *evtLoop) processPending() {
this.lock.Lock()
ls := this.cbQ
this.cbQ = list.New()
this.lock.Unlock()
for ls.Len() != 0 {
front := ls.Front()
val := front.Value.(func())
ls.Remove(front)
val()
}
}
func (this *evtLoop) Break() {
if atomic.LoadInt32(&this.stopFlag) == 1 {
return
}
atomic.StoreInt32(&this.stopFlag, 1)
this.Notify()
}
func (this *evtLoop) Close() error {
<-this.endRunSig
if atomic.CompareAndSwapInt32(&this.closeFlag, 0, 1) {
_ = this.poller.Close()
_ = this.notify.Close()
}
return nil
}
func (this *evtLoop) Poller() Poller {
return this.poller
}
func (this *evtLoop) Run(ctx context.Context) {
if atomic.LoadInt32(&this.stopFlag) == 1 {
panic("loop already finished!, don't reuse it")
}
if ctx != nil {
go func() {
select {
case <-ctx.Done():
this.Break()
case <-this.endRunSig:
// workaround if user never fill `ctx`
return
}
}()
}
for {
if atomic.LoadInt32(&this.stopFlag) == 1 {
break
}
_ = this.poller.Poll(-1)
}
this.processPending()
close(this.endRunSig)
}