Perhaps he means test and set?<p><pre><code>    https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Test-and-set
</code></pre>
Or the more efficient test and test and set?<p><pre><code>    https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Test_and_test-and-set</code></pre>