var runtime.extraMWaiters

4 uses

	runtime (current package)
		cgocall.go#L385: 	if gp.m.needextram || extraMWaiters.Load() > 0 {
		proc.go#L2413: 	c := extraMWaiters.Swap(0)
		proc.go#L2650: 	extraMWaiters atomic.Uint32
		proc.go#L2678: 				extraMWaiters.Add(1)