var runtime.extraMWaiters

4 uses

	runtime (current package)
		cgocall.go#L275: 	if gp.m.needextram || extraMWaiters.Load() > 0 {
		proc.go#L2094: 	c := extraMWaiters.Swap(0)
		proc.go#L2258: 	extraMWaiters atomic.Uint32
		proc.go#L2286: 				extraMWaiters.Add(1)

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