f, remove := mustTempFile(t)
	defer remove()

	other := mustOpen(t, f.Name())
	defer other.Close()

	lock(t, f)
	lockOther := mustBlock(t, "Lock", other)
	unlock(t, f)
	lockOther(t)
	unlock(t, other)
}

func TestLockExcludesRLock(t *testing.T) {
	t.Parallel()

	f, remove := mustTempFile(t)
	defer remove()

	other := mustOpen(t, f.Name())
	defer other.Close()

	lock(t, f)