const runtime.active_spin

2 uses

	runtime (current package)
		lock_spinbit.go#L54: 	active_spin     = 4  // referenced in proc.go for sync.Mutex implementation
		proc.go#L7511: 	if i >= active_spin || numCPUStartup <= 1 || gomaxprocs <= sched.npidle.Load()+sched.nmspinning.Load()+1 {