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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 | Methods | Notes |
|---|---|---|
| java.net.Socket | connect, read, write | |
| java.net.ServerSocket | accept | |
| java.net.DatagramSocket/MulticastSocket | receive | send does not block |
| 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 write and send do not block |
| java.nio.channels.Pipe.SourceChannel | read | |
| java.nio.channels.Pipe.SinkChannel | write | |
| java.net.InetAddress | getByName, getAllByName, .. | These methods currently off load name/address resolution to a background thread pool where threads block in the underlying NSS/equivalent. An alternative name service implementation for InetAddress is being developed in the sandbox (aefimov-dns-client-branch) that will be virtual thread friendly. |
The following blocking operations are not currently virtual thread friendly; these methods pin the carrier thread when the operation blocks.
| API | Methods | Notes |
|---|---|---|
| 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 fibers should not need to use non-blocking I/O and Selectors. |
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