const internal/poll.mutexRMask

5 uses

	internal/poll (current package)
		fd_mutex.go#L32: 	mutexRMask   = (1<<20 - 1) << 23
		fd_mutex.go#L83: 		new &^= mutexRMask | mutexWMask
		fd_mutex.go#L87: 			for old&mutexRMask != 0 {
		fd_mutex.go#L123: 		mutexMask = mutexRMask
		fd_mutex.go#L168: 		mutexMask = mutexRMask