The following blocking operations are virtual thread friendly in the current prototype; 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 operations pin the carrier thread when the operation blocks although they do use the ForkJoinPool.ManagedBocker mechanism to extended the parallelism temporarily when using the default scheduler.
| API | Methods | Notes |
|---|---|---|
| java.net.InetAddress | getByName, getAllByName, .. | An alternative name service implementation for InetAddress has been prototyped in the sandbox (aefimov-dns-client-branch) is virtual thread friendly. TBD if this will be proposed as a JEP. Minimallhy a service provider interface will be introduced to make it possible to deploy name service implementations that do not pin the carrier thread during lookups. |
| java.nio.channels.Selector | select | Selection operations are specified to synchronize on the selector and the selected-key set. May not be a concern as code using virtual thread should not need to use non-blocking I/O and Selectors. The number of Selectors is typically small anyway. |
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