You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/rio/rio-backend/src/performer
    
    the code of the file until where you have to start completion: pub mod handler;

use crate::crosswords::Crosswords;
use crate::event::sync::FairMutex;
#[cfg(not(target_os = "macos"))]
use crate::event::RioEvent;
use crate::event::{EventListener, Msg, WindowId};
use corcovado::channel;
#[cfg(unix)]
use corcovado::unix::UnixReady;
use corcovado::{self, Events, PollOpt, Ready};
use log::error;
use std::borrow::Cow;
use std::collections::VecDeque;
use std::io::{self, ErrorKind, Read, Write};
use std::sync::Arc;
use std::thread::{Builder, JoinHandle};
use std::time::Instant;
    
    fn pty_read(&mut self, state: &mut State, buf: &mut [u8]) -> io::Result<()> {
        let mut unprocessed = 0;
        let mut processed = 0;

        // Reserve the next terminal lock for PTY reading.
        let _terminal_lease = Some(self.terminal.lease());
        let mut terminal = None;

        loop {
            // Read from the PTY.
            match self.pty.reader().read(&mut buf[unprocessed..]) {
                // This is received on Windows/macOS when no more data is readable from the PTY.
                Ok(0) if unprocessed == 0 => break,
                Ok(got) => unprocessed += got,
                Err(err) => match err.kind() {
                    ErrorKind::Interrupted | ErrorKind::WouldBlock => {
                        // Go back to mio if we're caught up on parsing and the PTY would block.
                        if unprocessed == 0 {
                            break;
                        }
                    }
                    _ => return Err(err),
                },
            }

            // Attempt to lock the terminal.
            let terminal = match &mut terminal {
                Some(terminal) => terminal,
                None => terminal.insert(match self.terminal.try_lock_unfair() {
                    // Force block if we are at the buffer size limit.
                    None if unprocessed >= READ_BUFFER_SIZE => {
                        self.terminal.lock_unfair()
                    }
                    None => continue,
                    Some(terminal) => terminal,
                }),
            };

            // Parse the incoming bytes.
            for byte in &buf[..unprocessed] {
                state.parser.advance(&mut **terminal, *byte);
            }

            processed += unprocessed;
            unprocessed = 0;

            // Assure we're not blocking the terminal too long unnecessarily.
            if processed >= MAX_LOCKED_READ {
                break;
            }
        }

        // Queue terminal redraw unless all processed bytes were synchronized.
        if state.parser.sync_bytes_count() < processed && processed > 0 {
            #[cfg(target_os = "macos")]
            self.event_proxy.send_redraw(self.window_id);

            #[cfg(not(target_os = "macos"))]
            self.event_proxy
                .send_event(RioEvent::Wakeup, self.window_id);
        }

        Ok(())
    }