PipeInputStream and PipeOutputStream synchronous or asynchronous?

Either this is incorrect or the author is talking about how the consumer thread would block but the producer thread would still run. At the very least this wording is certainly confusing.

Yes, you do not show the whole text. If author says that producer is not blocked then it is asynchronous. Consuming is always blocking.

(ok, sometimes you can check the availability of the answer, but sync/async is distinguished by behaviour of the sender). It will be blocking when buffer length is 0 then writer will always block and synchronization occurs. So, we can say that blocking/nonblocking (sync/async) is a feature of the channel.

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