Function pqFlushNonBlocking

src/interfaces/libpq/fe-misc.c:1050–1059

* pqFlushNonBlocking: * * wrapper for pqFlush, used by the dispatcher. * conn will be temporarily set to non-blocking mode, * so that if not all data could be sent on 1st attempt, * pqFlushNonBlocking will return 1 instead of waiting/retrying. * * Return 0 on success, -1 on failure and 1 when not all data could be sent */

 * Return 0 on success, -1 on failure and 1 when not all data could be sent
 */
int
pqFlushNonBlocking(PGconn *conn)
{
	int			ret;
	bool old = conn->nonblocking;
	conn->nonblocking = true;
	ret = pqFlush(conn);
	conn->nonblocking = old;
	return ret;
}

/*
 * pqWait: wait until we can read or write the connection socket