const runtime.profReaderSleeping

6 uses

	runtime (current package)
		profbuf.go#L116: 	profReaderSleeping profIndex = 1 << 32 // reader is sleeping and must be woken up
		profbuf.go#L397: 			new |= old & profReaderSleeping
		profbuf.go#L404: 		if unread >= wakeupThreshold && old&profReaderSleeping != 0 {
		profbuf.go#L434: 		new &^= profReaderSleeping
		profbuf.go#L438: 		if old&profReaderSleeping != 0 {
		profbuf.go#L519: 		if !b.w.cas(bw, bw|profReaderSleeping) {