// init inits the manager and creates a goroutine to proxy the CGO calls.
// All actions related to an ALooper needs to be performed from the same
// OS thread. The goroutine proxy locks itself to an OS thread and handles the
// CGO traffic on the same thread.
func init() {
go func() {
runtime.LockOSThread()
C.GoAndroid_createManager()
for {
v := <-inout
switch s := v.in.(type) {
case enableSignal:
usecsDelay := s.delay.Nanoseconds() / 1000
code := int(C.GoAndroid_enableSensor(typeToInt(s.t), C.int32_t(usecsDelay)))
if code != 0 {
*s.err = fmt.Errorf("sensor: no default %v sensor on the device", s.t)
}
case disableSignal:
C.GoAndroid_disableSensor(typeToInt(s.t))
case readSignal:
n := readEvents(s.dst)
*s.n = n
case closeSignal:
C.GoAndroid_destroyManager()
close(v.out)
return // we don't need this goroutine anymore
}
close(v.out)
}
}()
}
// initialize inits the manager and creates a goroutine to proxy the CGO calls.
// All actions related to an ALooper needs to be performed from the same
// OS thread. The goroutine proxy locks itself to an OS thread and handles the
// CGO traffic on the same thread.
func (m *manager) initialize() {
m.inout = make(chan inOut)
go func() {
runtime.LockOSThread()
for {
v := <-m.inout
switch s := v.in.(type) {
case initSignal:
id := atomic.AddInt64(&nextLooperID, 1)
var mgr C.GoAndroid_SensorManager
C.GoAndroid_createManager(C.int(id), &mgr)
m.m = &mgr
case enableSignal:
usecsDelay := s.delay.Nanoseconds() / 1000
code := int(C.GoAndroid_enableSensor(m.m.queue, typeToInt(s.t), C.int32_t(usecsDelay)))
if code != 0 {
*s.err = fmt.Errorf("sensor: no default %v sensor on the device", s.t)
}
case disableSignal:
C.GoAndroid_disableSensor(m.m.queue, typeToInt(s.t))
case readSignal:
n, err := readEvents(m, s.dst)
*s.n = n
*s.err = err
case closeSignal:
C.GoAndroid_destroyManager(m.m)
close(v.out)
return // we don't need this goroutine anymore
}
close(v.out)
}
}()
if m.m == nil {
done := make(chan struct{})
m.inout <- inOut{
in: initSignal{},
out: done,
}
<-done
}
}