<dd>
    <p><!-- https://go.dev/issue/61015 -->
      Mutex profiles now scale contention by the number of goroutines blocked on the mutex.
      This provides a more accurate representation of the degree to which a mutex is a bottleneck in
      a Go program.
      For instance, if 100 goroutines are blocked on a mutex for 10 milliseconds, a mutex profile will
      now record 1 second of delay instead of 10 milliseconds of delay.
    </p>

to define an interface called <code>Locker</code>:
</p>

<pre>
type Locker interface {
	Lock()
	Unlock()
}
</pre>

<p>
If <code>S1</code> and <code>S2</code> also implement
</p>

<pre>
func (p T) Lock() { … }
func (p T) Unlock() { … }
</pre>

<p>
they implement the <code>Locker</code> interface as well
as the <code>File</code> interface.

to define an interface called <code>Locker</code>:
</p>

<pre>
type Locker interface {
	Lock()
	Unlock()
}
</pre>

<p>
If <code>S1</code> and <code>S2</code> also implement
</p>

<pre>
func (p T) Lock() { … }
func (p T) Unlock() { … }
</pre>

<p>
they implement the <code>Locker</code> interface as well
as the <code>File</code> interface.