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: diode.go
    path of file: ./repos/zerolog/diode
    
    the code of the file until where you have to start completion: // Package diode provides a thread-safe, lock-free, non-blocking io.Writer
// wrapper.
package diode

import (
	"context"
	"io"
	"sync"
	"time"

	"github.com/rs/zerolog/diode/internal/diodes"
)

var bufPool = &sync.Pool{
	New: func() interface{} {
		return make([]byte, 0, 500)
	},
}

type Alerter func(missed int)

type diodeFetcher interface {
	diodes.Diode
	Next() diodes.GenericDataType
}

// Writer is a io.Writer wrapper that uses a diode to make Write lock-free,
// non-blocking and thread safe.
type
    
func (dw Writer) poll() {
	defer close(dw.done)
	for {
		d := dw.d.Next()
		if d == nil {
			return
		}
		p := *(*[]byte)(d)
		dw.w.Write(p)

		// Proper usage of a sync.Pool requires each entry to have approximately
		// the same memory cost. To obtain this property when the stored type
		// contains a variably-sized buffer, we add a hard limit on the maximum buffer
		// to place back in the pool.
		//
		// See https://golang.org/issue/23199
		const maxSize = 1 << 16 // 64KiB
		if cap(p) <= maxSize {
			bufPool.Put(p[:0])
		}
	}
}