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: notify.go
    path of file: ./repos/goqu/vendor/github.com/lib/pq
    
    the code of the file until where you have to start completion: package pq

// Package pq is a pure Go Postgres driver for the database/sql package.
// This module contains support for Postgres LISTEN/NOTIFY.

import (
	"context"
	"database/sql/driver"
	"errors"
	"fmt"
	"sync"
	"sync/atomic"
	"time"
)

// Notification represents a single notification from the database.
type Notification struct {
	// Process ID (PID) of the notifying p
    
func (l *ListenerConn) listenerConnMain() {
	err := l.listenerConnLoop()

	// listenerConnLoop terminated; we're done, but we still have to clean up.
	// Make sure nobody tries to start any new queries by making sure the err
	// pointer is set.  It is important that we do not overwrite its value; a
	// connection could be closed by either this goroutine or one sending on
	// the connection -- whoever closes the connection is assumed to have the
	// more meaningful error message (as the other one will probably get
	// net.errClosed), so that goroutine sets the error we expose while the
	// other error is discarded.  If the connection is lost while two
	// goroutines are operating on the socket, it probably doesn't matter which
	// error we expose so we don't try to do anything more complex.
	l.connectionLock.Lock()
	if l.err == nil {
		l.err = err
	}
	l.cn.Close()
	l.connectionLock.Unlock()

	// There might be a query in-flight; make sure nobody's waiting for a
	// response to it, since there's not going to be one.
	close(l.replyChan)

	// let the listener know we're done
	close(l.notificationChan)

	// this ListenerConn is done
}