[ViewVC] Diff of: cvs/libev/ev

Comparing libev/ev_epoll.c (file contents):
Revision 1.62 by root, Sat Jun 4 05:25:03 2011 UTC vs.
Revision 1.68 by root, Fri Apr 25 13:05:39 2014 UTC

       int fd = (uint32_t)ev->data.u64; /* mask out the lower 32 bits */
       int want = anfds [fd].events;
       int got  = (ev->events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
                | (ev->events & (EPOLLIN  | EPOLLERR | EPOLLHUP) ? EV_READ  : 0);
+      /*
-      /* check for spurious notification */
+       * check for spurious notification.
+       * this only finds spurious notifications on egen updates
+       * other spurious notifications will be found by epoll_ctl, below
-      /* we assume that fd is always in range, as we never shrink the anfds array */
+       * we assume that fd is always in range, as we never shrink the anfds array
+       */
       if (expect_false ((uint32_t)anfds [fd].egen != (uint32_t)(ev->data.u64 >> 32)))
         {
           /* recreate kernel state */
           postfork = 1;
           continue;
       if (expect_false (got & ~want))
         {
           anfds [fd].emask = want;
+          /*
-          /* we received an event but are not interested in it, try mod or del */
+           * we received an event but are not interested in it, try mod or del
-          /* I don't think we ever need MOD, but let's handle it anyways */
+           * this often happens because we optimistically do not unregister fds
+           * when we are no longer interested in them, but also when we get spurious
+           * notifications for fds from another process. this is partially handled
+           * above with the gencounter check (== our fd is not the event fd), and
+           * partially here, when epoll_ctl returns an error (== a child has the fd
+           * but we closed it).
+           */
           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. */
       unsigned char events = anfds [fd].events & (EV_READ | EV_WRITE);
       if (anfds [fd].emask & EV_EMASK_EPERM && events)
         fd_event (EV_A_ fd, events);
       else
+        {
-        epoll_eperms [i] = epoll_eperms [--epoll_epermcnt];
+          epoll_eperms [i] = epoll_eperms [--epoll_epermcnt];
+          anfds [fd].emask = 0;
+        }
     }
 }
 int inline_size
 epoll_init (EV_P_ int flags)
 {
 #ifdef EPOLL_CLOEXEC
   backend_fd = epoll_create1 (EPOLL_CLOEXEC);
-  if (backend_fd <= 0)
+  if (backend_fd < 0 && (errno == EINVAL || errno == ENOSYS))
 #endif
     backend_fd = epoll_create (256);
   if (backend_fd < 0)
     return 0;
   fcntl (backend_fd, F_SETFD, FD_CLOEXEC);
-  backend_fudge  = 1./1024.; /* epoll does sometimes return early, this is just to avoid the worst */
+  backend_mintime = 1e-3; /* epoll does sometimes return early, this is just to avoid the worst */
-  backend_modify = epoll_modify;
+  backend_modify  = epoll_modify;
-  backend_poll   = epoll_poll;
+  backend_poll    = epoll_poll;
   epoll_eventmax = 64; /* initial number of events receivable per poll */
   epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax);
   return EVBACKEND_EPOLL;

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing libev/ev_epoll.c (file contents): Revision 1.62 by root, Sat Jun 4 05:25:03 2011 UTC vs. Revision 1.68 by root, Fri Apr 25 13:05:39 2014 UTC

Diff Legend

Comparing libev/ev_epoll.c (file contents):
Revision 1.62 by root, Sat Jun 4 05:25:03 2011 UTC vs.
Revision 1.68 by root, Fri Apr 25 13:05:39 2014 UTC