I don't know if std::condition_variable is async-signal safe, but an easy fix is...

		listeria 2 days ago \| parent \| context \| favorite \| on: Show HN: X11 tool to share a screen area in any vi... I don't know if std::condition_variable is async-signal safe, but an easy fix is to replace the sleeping with pause(2). There's also sigwait(3), which wouldn't need a signal handler.