var net.threadLimit

4 uses

	net (current package)
		net.go#L805: var threadLimit chan struct{}
		net.go#L811: 		threadLimit = make(chan struct{}, concurrentThreadsLimit())
		net.go#L814: 	case threadLimit <- struct{}{}:
		net.go#L822: 	<-threadLimit

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)