hdx(+StreamPair, +Term, -Codes, +TimeOut) is semidet

 hdx(+In, -Codes, +TimeOut) is semidet

 hdx(+Out, +Term) is semidet

Performs a single half-duplex stream interaction with StreamPair. Flushes Term to the output stream. Reads pending Codes from the input stream within TimeOut seconds. Succeeds when a write-read cycle completes without timing out; fails on time-out expiry.

Filling a stream buffer blocks the calling thread if there is no input ready. Pending read operations also block for the same reason. Hence the wait_for_input/3 must precede them.

Arguments:

StreamPair	- connection from client to server, a closely-associated input and output stream pairing used for half-duplex communication.
Term	- to write and flush.
Codes	- waited for and extracted from the pending input stream.
TimeOut	- in seconds.

Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 hdx(Arg1, Arg2, Arg3)

 hdx(Arg1, Arg2)