Method waitForOperationComplete

src/SFML/Network/Sftp.cpp:358–386

    template <typename Callable>
    int waitForOperationComplete(const Callable& operation, const sf::TimeoutWithPredicate& timeout)
    {
        while (true)
        {
            if (const auto result = operation(); result != LIBSSH2_ERROR_EAGAIN)
                return result; // Operation completed without having to block

            // Wait for socket to become ready
            const auto directions = libssh2_session_block_directions(ssh2Session.get());
            if (directions == (LIBSSH2_SESSION_BLOCK_INBOUND | LIBSSH2_SESSION_BLOCK_OUTBOUND))
            {
                if (selectorEither.wait(timeout.getPeriod()))
                    continue;
            }
            else if (directions == LIBSSH2_SESSION_BLOCK_OUTBOUND)
            {
                if (selectorSend.wait(timeout.getPeriod()))
                    continue;
            }
            else
            {
                if (selectorRecv.wait(timeout.getPeriod()))
                    continue;
            }

            if (!timeout.getPredicate()())
                return LIBSSH2_ERROR_EAGAIN; // Gave up waiting
        }
    }

    Sftp::Result initializeSftp(const TimeoutWithPredicate& timeout)
    {