Hi! > Well, obviously, you need to call a function or macro every time you toggle > the flags. > > Apart from that, it doesn't matter whether you toggle once or many times per > event loop iteration - when libev polls for new events, it will tell the > backend about them. > > For select and poll, the overhead is trivial, for kqueue and epoll, its > nontrivial and even partially depends on outside events. In the worst > case, it is one extra syscall per fd with epoll, in the best case, the > overhead is trivial with epoll.
Thanks a lot! I am most interested in the epoll backend. Does libev issue a epoll_ctl() for every io watcher that changed mode in the last iteration or the behavior is somewhat more sophisticated (i.e. no epoll_ctl() when the ‘initial’ and ‘final’ modes were the same)? _______________________________________________ libev mailing list libev@lists.schmorp.de http://lists.schmorp.de/cgi-bin/mailman/listinfo/libev
