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<p>When used ignore_error it might get invoked on error. </p>
-<p>All <code class="computeroutput">on_exit</code> use one signal(SIGCHLD) on posix, which is only guaranteed to work when all use the same <code class="computeroutput">io_context</code>. </p>
+<p><code class="computeroutput">on_exit</code> uses <code class="computeroutput">boost::asio::signal_set</code> to listen for <code class="computeroutput">SIGCHLD</code> on posix, and so has the same restrictions as that class (do not register a handler for <code class="computeroutput">SIGCHLD</code> except by using <code class="computeroutput">boost::asio::signal_set</code>). </p>
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