The following blocking operations are virtual thread friendly; these methods do not pin the carrier thread when the operation blocks.
| API | Blocking Methods | Notes |
|---|---|---|
| java.net.Socket | connect, read, write | |
| java.net.ServerSocket | accept | |
| java.net.DatagramSocket/MulticastSocket | receive | |
| java.nio.channels.SocketChannel | connect, read, write | socket adaptor connect, read, and write also okay |
| java.nio.channels.ServerSocketChannel | accept | socket adaptor accept also okay |
| java.nio.channels.DatagramChannel | read, receive | socket adaptor receive also okay |
| java.nio.channels.Pipe.SourceChannel | read | |
| java.nio.channels.Pipe.SinkChannel | write |
The following blocking uses the ForkJoinPool.ManagedBocker mechanism to temporarily expand the parallelism until the blocking operation completes.
| API | Methods |
|---|---|
| java.io.File | All file I/O operations |
| java.io.FileInputStream | open, read, skip |
| java.io.FileOutputStream | open, write |
| java.io.RandomAccessFile | open, read, write, seek |
| java.io.Console | All read, format and PrintStream operations |
| java.net.InetAddress | All lookup operations |
| java.nio.MappedByteBuffer | force |
| java.nio.channels.Selector | All blocking selection operations |
| java.nio.channels.FileChannel | read, write, lock, truncate, force, transferTo |
| java.nio.file | All file I/O operations |
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