added kqeueue backend, completely untested

[software/libev.git] / ev_epoll.c

diff --git a/ev_epoll.c b/ev_epoll.c
index 42e4a8bd05615c0d1154b16a2362404171fdbeaf..4793212dccbc28adcdd9c45edc293727bdcf0856 100644 (file)
--- a/ev_epoll.c
+++ b/ev_epoll.c
@@ -1,52 +1,71 @@
+/*
+ * libev epoll fd activity backend
+ *
+ * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
 #include <sys/epoll.h>
 
 static int epoll_fd = -1;
 
 static void
-epoll_reify_fd (int fd)
+epoll_modify (int fd, int oev, int nev)
 {
-  ANFD *anfd = anfds + fd;
-  struct ev_io *w;
-
-  int wev = 0;
+  int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;
 
-  for (w = anfd->head; w; w = w->next)
-    wev |= w->events;
+  struct epoll_event ev;
+  ev.data.fd = fd;
+  ev.events =
+      (nev & EV_READ ? EPOLLIN : 0)
+      | (nev & EV_WRITE ? EPOLLOUT : 0);
 
-  if (anfd->wev != wev)
-    {
-      int mode = wev ? anfd->wev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;
-      struct epoll_event ev;
-      ev.events = wev;
-      ev.data.fd = fd;
-      fprintf (stderr, "reify %d,%d,%d m%d (r=%d)\n", fd, anfd->wev, wev, mode,//D
-      epoll_ctl (epoll_fd, mode, fd, &ev)
-      );//D
-      anfd->wev = wev;
-    }
+  epoll_ctl (epoll_fd, mode, fd, &ev);
 }
 
-void epoll_postfork_child (void)
+static void
+epoll_postfork_child (void)
 {
-  int i;
+  int fd;
 
   epoll_fd = epoll_create (256);
+  fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
 
-  for (i = 0; i < anfdmax; ++i)
-    epoll_reify_fd (i);
-}
-
-static void epoll_reify (void)
-{
-  int i;
-  for (i = 0; i < fdchangecnt; ++i)
-    epoll_reify_fd (fdchanges [i]);
+  /* re-register interest in fds */
+  for (fd = 0; fd < anfdmax; ++fd)
+    if (anfds [fd].events)//D
+      epoll_modify (fd, EV_NONE, anfds [fd].events);
 }
 
 static struct epoll_event *events;
 static int eventmax;
 
-static void epoll_poll (ev_tstamp timeout)
+static void
+epoll_poll (ev_tstamp timeout)
 {
   int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.));
   int i;
@@ -57,33 +76,35 @@ static void epoll_poll (ev_tstamp timeout)
   for (i = 0; i < eventcnt; ++i)
     fd_event (
       events [i].data.fd,
-      (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP | EPOLLPRI) ? EV_WRITE : 0)
-      | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP)           ? EV_READ  : 0)
+      (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
+      | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0)
     );
 
   /* if the receive array was full, increase its size */
-  if (eventcnt == eventmax)
+  if (expect_false (eventcnt == eventmax))
     {
       free (events);
-      eventmax += eventmax >> 1;
+      eventmax = array_roundsize (events, eventmax << 1);
       events = malloc (sizeof (struct epoll_event) * eventmax);
     }
 }
 
-int epoll_init (int flags)
+static void
+epoll_init (int flags)
 {
   epoll_fd = epoll_create (256);
 
   if (epoll_fd < 0)
-    return 0;
+    return;
+
+  fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
 
-  ev_method = EVMETHOD_EPOLL;
-  method_fudge = 1e-3; /* needed to compensate fro epoll returning early */
-  method_reify = epoll_reify;
-  method_poll  = epoll_poll;
+  ev_method     = EVMETHOD_EPOLL;
+  method_fudge  = 1e-3; /* needed to compensate for epoll returning early */
+  method_modify = epoll_modify;
+  method_poll   = epoll_poll;
 
   eventmax = 64; /* intiial number of events receivable per poll */
   events = malloc (sizeof (struct epoll_event) * eventmax);
-
-  return 1;
 }
+