Method trigger_pty_flush

vmm/src/serial_manager.rs:231–251

This function should be called when the other end of the PTY is connected. It verifies if this is the first time it's been invoked after the connection happened, and if that's the case it flushes all output from the serial to the PTY. Otherwise, it's a no-op.

(
        #[cfg(any(target_arch = "x86_64", target_arch = "riscv64"))] serial: &Arc<Mutex<Serial>>,
        #[cfg(target_arch = "aarch64")] serial: &Arc<Mutex<Pl011>>,
        pty_write_out: Option<&A

    // after the connection happened, and if that's the case it flushes
    // all output from the serial to the PTY. Otherwise, it's a no-op.
    fn trigger_pty_flush(
        #[cfg(any(target_arch = "x86_64", target_arch = "riscv64"))] serial: &Arc<Mutex<Serial>>,
        #[cfg(target_arch = "aarch64")] serial: &Arc<Mutex<Pl011>>,
        pty_write_out: Option<&Arc<AtomicBool>>,
    ) -> Result<()> {
        if let Some(pty_write_out) = &pty_write_out {
            if pty_write_out.load(Ordering::Acquire) {
                return Ok(());
            }

            pty_write_out.store(true, Ordering::Release);

            serial
                .lock()
                .unwrap()
                .flush_output()
                .map_err(Error::FlushOutput)?;
        }

        Ok(())
    }

    pub fn start_thread(&mut self, exit_evt: EventFd) -> Result<()> {
        // Don't allow this to be run if the handle exists