audio: Lock OS Thread during initializing OpenAL audio

exp/audio/internal/driver/driver_openal.go

@@ -52,14 +52,24 @@ func alFormat(channelNum, bytesPerSample int) uint32 {
 }
 
 func NewPlayer(src io.Reader, sampleRate, channelNum, bytesPerSample int) (*Player, error) {
+	var p *Player
+	var err error
+	ch := make(chan struct{})
+	go func() {
+		defer close(ch)
+		// Lock the OS thread to avoid switching the native threads during initialization.
+		// This seems to solve #195, but I'm not sure.
+		runtime.LockOSThread()
 		if e := al.OpenDevice(); e != nil {
-		return nil, fmt.Errorf("driver: OpenAL initialization failed: %v", e)
+			err = fmt.Errorf("driver: OpenAL initialization failed: %v", e)
+			return
 		}
 		s := al.GenSources(1)
-	if err := al.Error(); err != 0 {
-		return nil, fmt.Errorf("driver: al.GenSources error: %d", err)
+		if e := al.Error(); e != 0 {
+			err = fmt.Errorf("driver: al.GenSources error: %d", e)
+			return
 		}
-	p := &Player{
+		p = &Player{
 			alSource:   s[0],
 			alBuffers:  []al.Buffer{},
 			source:     src,
@@ -76,6 +86,11 @@ func NewPlayer(src io.Reader, sampleRate, channelNum, bytesPerSample int) (*Play
 			p.alSource.QueueBuffers(b)
 		}
 		al.PlaySources(p.alSource)
+	}()
+	<-ch
+	if err != nil {
+		return nil, err
+	}
 	return p, nil
 }