# Usage

```go
package main

import (
	"fmt"

	"github.com/smallnest/ringbuffer"
)

func main() {
	rb := ringbuffer.New(1024)

	// write
	rb.Write([]byte("abcd"))
	fmt.Println(rb.Length())
	fmt.Println(rb.Free())

	// read
	buf := make([]byte, 4)
	rb.Read(buf)
	fmt.Println(string(buf))
}
```

		t.Error("DeadlineWriter shouldn't be successful - should return context.DeadlineExceeded")
	}
	w.Close()
	w = NewDeadlineWriter(&sleepWriter{timeout: 100 * time.Millisecond}, 600*time.Millisecond)
	n, err := w.Write([]byte("abcd"))
	w.Close()
	if err != nil {
		t.Errorf("DeadlineWriter should succeed but failed with %s", err)
	}
	if n != 4 {