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audio: Bug fix: Make ensureReadLoop exactly atomic

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This commit is contained in:
Hajime Hoshi 2019-04-29 00:05:54 +09:00
parent b1607de99d
commit 835497edd3
1 changed files with 5 additions and 14 deletions
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19
audio/audio.go
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@ -376,22 +376,22 @@ func (p *playerImpl) ensureReadLoop() error {
if p.closedExplicitly { if p.closedExplicitly {
return fmt.Errorf("audio: the player is already closed") return fmt.Errorf("audio: the player is already closed")
} }
// TODO: This is not exactly atomic: there is a little chance not to run the loop even though the current
// loop is about to end. Fix this.
if p.runningReadLoop { if p.runningReadLoop {
return nil return nil
} }
p.runningReadLoop = true
go p.readLoop() go p.readLoop()
return nil return nil
} }
func (p *playerImpl) closeImpl() error { func (p *playerImpl) closeImpl() error {
p.m.Lock() p.m.Lock()
r := p.runningReadLoop defer p.m.Unlock()
p.m.Unlock() if !p.runningReadLoop {
if !r {
return nil return nil
} }
p.runningReadLoop = false
p.closeCh <- struct{}{} p.closeCh <- struct{}{}
<-p.closedCh <-p.closedCh
@ -420,15 +420,6 @@ func (p *playerImpl) Play() {
} }
func (p *playerImpl) readLoop() { func (p *playerImpl) readLoop() {
p.m.Lock()
p.runningReadLoop = true
p.m.Unlock()
defer func() {
p.m.Lock()
p.runningReadLoop = false
p.m.Unlock()
}()
timer := time.NewTimer(0) timer := time.NewTimer(0)
timerCh := timer.C timerCh := timer.C
var readErr error var readErr error