Re: libpq: Which functions may hang due to network issues?

On Fri, 2021-12-03 at 11:37 +0100, Daniel Frey wrote:
> I need to know which functions of libpq may "hang", depending on network issues. For some functions is
> seems to be clear, as they only work locally, other functions are clearly documented to wait on some
> network interaction. But for some functions, it is unclear on whether they are guaranteed to work
> locally without any possibility to hang or not, e.g. PQfinish(), PQstatus(), PQtransactionStatus(), etc.
>
> Is there a complete list of methods that might wait for network communication?

No; you have to read the code.

For example, PGstatus is defined like this:

PQstatus(const PGconn *conn)
{
if (!conn)
return CONNECTION_BAD;
return conn->status;
}

This does not access the network.

Yours,
Laurenz Albe