package synchelper

import (
	"io"
	"sync"
)

// NewSyncWriter 返回写互斥的 writer
func NewSyncWriter(writer io.Writer) io.Writer {
	return &syncWriter{
		writer: writer,
		lock:   sync.Mutex{},
	}
}

type syncWriter struct {
	writer io.Writer
	lock   sync.Mutex
}

func (w *syncWriter) Write(p []byte) (int, error) {
	w.lock.Lock()
	defer w.lock.Unlock()
	return w.writer.Write(p)
}