func (m *Mutex) unlock() {
unlocked := m.state &^ 1
barrier.Memory()
if atomic.AddUintptr(&m.state, ^uintptr(0)) != unlocked {
panic("sync: unlock of unlocked mutex")
}
noos.Event(unlocked).Send()
}
func (m *Mutex) lock() {
state := atomic.LoadUintptr(&m.state)
if state == 0 {
state = uintptr(noos.AssignEventFlag())
if !atomic.CompareAndSwapUintptr(&m.state, 0, state) {
state = m.state
}
}
unlocked, locked := state&^1, state|1
for {
if atomic.CompareAndSwapUintptr(&m.state, unlocked, locked) {
return
}
noos.Event(unlocked).Wait()
}
}