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  4. This page on blocking operations can be removed.

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changes.mady.by.user Alan Bateman

Saved on Jan 22, 2020

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changes.mady.by.user Alan Bateman

Saved on Feb 27, 2020

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APIBlocking MethodsNotes
java.net.Socketconnect, read, write
java.net.ServerSocketaccept
java.net.DatagramSocket/MulticastSocketreceive



java.nio.channels.SocketChannelconnect, read, writesocket adaptor connect, read, and write also okay
java.nio.channels.ServerSocketChannelacceptsocket adaptor accept also okay
java.nio.channels.DatagramChannelread, receive

socket adaptor receive also okay

java.nio.channels.Pipe.SourceChannelread
java.nio.channels.Pipe.SinkChannelwrite


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.

APIMethodsNotes
java.net.InetAddressgetByName, 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 has been prototyped in the sandbox (aefimov-dns-client-branch) that will be 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.

APIMethodsNotes
java.nio.channels.SelectorselectSelection operations are specified to synchronize on the selector and the selected-key set. May not be a concern as code using fibers 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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