p;modif:float&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;interval_timer&nbsp;=<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Unix</span>.interval_timer&nbsp;=<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">ITIMER_REAL</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">ITIMER_VIRTUAL</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span clas