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     sigaddset (&block, SIGUSR1);
     sigprocmask (SIG_BLOCK, &block, &prev);

     while (queue_get (&data))
       process (data);

     if (sigismember (&prev, SIGUSR1)
       sigprocmask (SIG_UNBLOCK, &block, 0);
   }

(Note: pthreads in theory requires you to use C<pthread_setmask>
instead of C<sigprocmask> when you use threads, but libev doesn't do it
either...).

=item queueing from a thread context

The strategy for threads is different, as you cannot (easily) block
threads but you can easily preempt them, so to queue safely you need to
employ a traditional mutex lock, such as in this pthread example:

   static ev_async mysig;