diff options
-rw-r--r-- | ev.pod | 3 | ||||
-rw-r--r-- | ev_epoll.c | 2 |
2 files changed, 5 insertions, 0 deletions
@@ -413,6 +413,9 @@ C<EV_WRITE> to C<POLLOUT | POLLERR | POLLHUP>. =item C<EVBACKEND_EPOLL> (value 4, Linux) +Use the linux-specific epoll(7) interface (for both pre- and post-2.6.9 +kernels). + For few fds, this backend is a bit little slower than poll and select, but it scales phenomenally better. While poll and select usually scale like O(total_fds) where n is the total number of fds (or the highest fd), @@ -161,6 +161,8 @@ epoll_poll (EV_P_ ev_tstamp timeout) ev->events = (want & EV_READ ? EPOLLIN : 0) | (want & EV_WRITE ? EPOLLOUT : 0); + /* pre-2.6.9 kernels require a non-null pointer with EPOLL_CTL_DEL, */ + /* which is fortunately easy to do for us. */ if (epoll_ctl (backend_fd, want ? EPOLL_CTL_MOD : EPOLL_CTL_DEL, fd, ev)) { postfork = 1; /* an error occured, recreate kernel state */ |