The following blocking operations are fiber friendly, meaning the fiber will park when the socket is not ready for I/O:

API	Methods	Notes
java.nio.channels.SocketChannel	read, write, close
	socket adaptor: read, write, close
java.nio.channels.ServerSocketChannel	accept, close
	socket adaptor: accept, close
java.nio.channels.DatagramChannel	read/receive, close
java.nio.channels.Pipe.SourceChannel	read, close
java.nio.channels.Pipe.SinkChannel	write, close

java.net.Socket	read, write, close
java.net.ServerSocket	accept, close

The following blocking operations are not currently fiber friendly; these methods may pin the carrier thread:

API	Methods	Notes
java.nio.channels.DatagramChannel	socket adaptor: receive
java.net.DatagramSocket	receive
Thread.interrupt		If a thread is blocked in an I/O operation on an InterruptibleChannel then the channel is closed. The locking to support this is not yet fiber friendly so Thread.interrupt may pin the carrier thread while waiting for the blocking operations on the channel to abort.