From 2e973617d5c21aa162c0a3852efdfe2812c24e53 Mon Sep 17 00:00:00 2001 From: root Date: Thu, 2 Jun 2011 23:42:40 +0000 Subject: *** empty log message *** --- ev.pod | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) (limited to 'ev.pod') diff --git a/ev.pod b/ev.pod index 52d0c54..4ac1d12 100644 --- a/ev.pod +++ b/ev.pod @@ -501,19 +501,22 @@ forks then I parent and child process have to recreate the epoll set, which can take considerable time (one syscall per file descriptor) and is of course hard to detect. -Epoll is also notoriously buggy - embedding epoll fds I work, but -of course I, and epoll just loves to report events for totally -I file descriptors (even already closed ones, so one cannot -even remove them from the set) than registered in the set (especially -on SMP systems). Libev tries to counter these spurious notifications by -employing an additional generation counter and comparing that against the -events to filter out spurious ones, recreating the set when required. Last +Epoll is also notoriously buggy - embedding epoll fds I work, +but of course I, and epoll just loves to report events for +totally I file descriptors (even already closed ones, so +one cannot even remove them from the set) than registered in the set +(especially on SMP systems). Libev tries to counter these spurious +notifications by employing an additional generation counter and comparing +that against the events to filter out spurious ones, recreating the set +when required. Epoll also errornously rounds down timeouts, but gives you +no way to know when and by how much, so sometimes you have to busy-wait +because epoll returns immediately despite a nonzero timeout. And last not least, it also refuses to work with some file descriptors which work perfectly fine with C