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    <p>You should declare your flag</p> <pre><code> static volatile sig_atomic_t globalFlag = 0; </code></pre> <p>See e.g. <a href="http://www.cplusplus.com/reference/csignal/sig_atomic_t/" rel="nofollow noreferrer">sig_atomic_t</a>, <a href="https://stackoverflow.com/q/8488791/841108">this question</a> and don't forget the <code>volatile</code> qualifier. (It may have been spelled <code>sigatomic_t</code> for C).</p> <p>On Linux (specifically) you could use <a href="http://man7.org/linux/man-pages/man2/signalfd.2.html" rel="nofollow noreferrer">signalfd(2)</a> to get a filedescriptor for the signal, and that fd can be <a href="http://man7.org/linux/man-pages/man2/poll.2.html" rel="nofollow noreferrer">poll(2)</a>-ed by your event loop.</p> <p>Some event loop libraries (<a href="http://libevent.org/" rel="nofollow noreferrer">libevent</a>, <a href="http://software.schmorp.de/pkg/libev.html" rel="nofollow noreferrer">libev</a> ...) know how to handle signals.</p> <p>And there is also the trick of setting up a pipe (see <a href="http://man7.org/linux/man-pages/man2/pipe.2.html" rel="nofollow noreferrer">pipe(2)</a> for more) at initialization, and just <a href="http://man7.org/linux/man-pages/man2/write.2.html" rel="nofollow noreferrer">write(2)</a>-ing some byte on it in the signal handler. The event loop would poll and read that pipe.</p> <p>Read also <a href="http://man7.org/linux/man-pages/man7/signal.7.html" rel="nofollow noreferrer">signal(7)</a> (it explains what are the limited set of functions or syscalls usable inside a signal handler)....</p> <p>BTW, correctness is more important than efficiency. In general, you get few signals (e.g. most programs get a signal once every second at most, not every millisecond).</p>
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    1. COThe 'efficiency' requirement was because the flag will be tested in a fairly tight loop, set only occasionally (as you mentioned) in the signal handler. But you are right, generally correctness > performance, except in my case an occasional false negative is acceptable.
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