avoid backend_modify call unless ev_io_set was used

[software/libev.git] / ev_kqueue.c

diff --git a/ev_kqueue.c b/ev_kqueue.c
index 4933270c1d2d893f8f7acec0a5db4fd97057237d..149455d609fd2f1ad320257f2743aef51cf76291 100644 (file)
--- a/ev_kqueue.c
+++ b/ev_kqueue.c
@@ -1,30 +1,32 @@
 /*
 /*

- * Copyright 2007      Marc Alexander Lehmann <libev@schmorp.de>
- * Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
+ * libev kqueue backend
+ *
+ * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>

  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without

- * modification, are permitted provided that the following conditions
- * are met:
+ * 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.

  *
  *

- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. 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.
- * 3. The name of the author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.
+ *     * 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 AUTHOR ``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 AUTHOR 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,
+ * 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
  * 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.
+ * (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/types.h>
  */
 
 #include <sys/types.h>


@@ -34,19 +36,15 @@
 #include <string.h>
 #include <errno.h>
 
 #include <string.h>
 #include <errno.h>
 

-static void
+void inline_speed

 kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
 {
   struct kevent *ke;
 
 kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
 {
   struct kevent *ke;
 

-  array_needsize (struct kevent, kqueue_changes, kqueue_changemax, ++kqueue_changecnt, );
+  ++kqueue_changecnt;
+  array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);

 
 

-  ke = &kqueue_changes [kqueue_changecnt - 1];
-  memset (ke, 0, sizeof (struct kevent));
-  ke->ident  = fd;
-  ke->filter = filter;
-  ke->flags  = flags;
-  ke->fflags = fflags;
+  EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0);

 }
 
 #ifndef NOTE_EOF
 }
 
 #ifndef NOTE_EOF


@@ -56,17 +54,20 @@ kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
 static void
 kqueue_modify (EV_P_ int fd, int oev, int nev)
 {
 static void
 kqueue_modify (EV_P_ int fd, int oev, int nev)
 {

-  /* to detect close/reopen reliably, we have to remove and re-add */
-  /* event requests even when oev == nev */
+  if (oev != nev)
+    {
+      if (oev & EV_READ)
+        kqueue_change (EV_A_ fd, EVFILT_READ , EV_DELETE, 0);

 
 

-  if (oev & EV_READ)
-    kqueue_change (EV_A_ fd, EVFILT_READ, EV_DELETE, 0);
+      if (oev & EV_WRITE)
+        kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0);
+    }

 
 

-  if (oev & EV_WRITE)
-    kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0);
+  /* to detect close/reopen reliably, we have to re-add */
+  /* event requests even when oev == nev */

 
   if (nev & EV_READ)
 
   if (nev & EV_READ)

-    kqueue_change (EV_A_ fd, EVFILT_READ, EV_ADD, NOTE_EOF);
+    kqueue_change (EV_A_ fd, EVFILT_READ , EV_ADD, NOTE_EOF);

 
   if (nev & EV_WRITE)
     kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF);
 
   if (nev & EV_WRITE)
     kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF);


@@ -82,16 +83,16 @@ kqueue_poll (EV_P_ ev_tstamp timeout)
   if (kqueue_changecnt > kqueue_eventmax)
     {
       ev_free (kqueue_events);
   if (kqueue_changecnt > kqueue_eventmax)
     {
       ev_free (kqueue_events);

-      kqueue_eventmax = array_roundsize (struct kevent, kqueue_changecnt);
-      kqueue_events = ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
+      kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_changecnt);
+      kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);

     }
 
   ts.tv_sec  = (time_t)timeout;
     }
 
   ts.tv_sec  = (time_t)timeout;

-  ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9;
-  res = kevent (kqueue_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
+  ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9);
+  res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);

   kqueue_changecnt = 0;
 
   kqueue_changecnt = 0;
 

-  if (res < 0)
+  if (expect_false (res < 0))

     { 
       if (errno != EINTR)
         syserr ("(libev) kevent");
     { 
       if (errno != EINTR)
         syserr ("(libev) kevent");


@@ -103,20 +104,10 @@ kqueue_poll (EV_P_ ev_tstamp timeout)
     {
       int fd = kqueue_events [i].ident;
 
     {
       int fd = kqueue_events [i].ident;
 

-      if (kqueue_events [i].flags & EV_ERROR)
+      if (expect_false (kqueue_events [i].flags & EV_ERROR))

         {
          int err = kqueue_events [i].data;
 
         {
          int err = kqueue_events [i].data;
 

-          /* 
-           * errors that may happen
-           *   EBADF happens when the file discriptor has been
-           *   closed,
-           *   ENOENT when the file descriptor was closed and
-           *   then reopened.
-           *   EINVAL for some reasons not understood; EINVAL
-           *   should not be returned ever; but FreeBSD does :-\
-           */
-

           /* we are only interested in errors for fds that we are interested in :) */
           if (anfds [fd].events)
            {
           /* we are only interested in errors for fds that we are interested in :) */
           if (anfds [fd].events)
            {


@@ -146,73 +137,52 @@ kqueue_poll (EV_P_ ev_tstamp timeout)
   if (expect_false (res == kqueue_eventmax))
     {
       ev_free (kqueue_events);
   if (expect_false (res == kqueue_eventmax))
     {
       ev_free (kqueue_events);

-      kqueue_eventmax = array_roundsize (struct kevent, kqueue_eventmax << 1);
-      kqueue_events = ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
+      kqueue_eventmax = array_nextsize (sizeof (struct kevent), kqueue_eventmax, kqueue_eventmax + 1);
+      kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);

     }
 }
 
     }
 }
 

-static int
+int inline_size

 kqueue_init (EV_P_ int flags)
 {
   struct kevent ch, ev;
 
   /* Initalize the kernel queue */
 kqueue_init (EV_P_ int flags)
 {
   struct kevent ch, ev;
 
   /* Initalize the kernel queue */

-  if ((kqueue_fd = kqueue ()) < 0)
+  if ((backend_fd = kqueue ()) < 0)

     return 0;
 
     return 0;
 

-  fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
-
-  /* Check for Mac OS X kqueue bug. */
-  ch.ident  = -1;
-  ch.filter = EVFILT_READ;
-  ch.flags  = EV_ADD;
-
-  /* 
-   * If kqueue works, then kevent will succeed, and it will
-   * stick an error in ev. If kqueue is broken, then
-   * kevent will fail.
-   */
-  if (kevent (kqueue_fd, &ch, 1, &ev, 1, 0) != 1
-      || ev.ident != -1
-      || ev.flags != EV_ERROR)
-    {
-      /* detected broken kqueue */
-      close (kqueue_fd);
-      return 0;
-    }
+  fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */

 
 

-  method_fudge  = 1e-3; /* needed to compensate for kevent returning early */
-  method_modify = kqueue_modify;
-  method_poll   = kqueue_poll;
+  backend_fudge  = 0.;
+  backend_modify = kqueue_modify;
+  backend_poll   = kqueue_poll;

 
 

-  kqueue_eventmax = 64; /* intiial number of events receivable per poll */
-  kqueue_events = ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
+  kqueue_eventmax = 64; /* initial number of events receivable per poll */
+  kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);

 
   kqueue_changes   = 0;
   kqueue_changemax = 0;
   kqueue_changecnt = 0;
 
 
   kqueue_changes   = 0;
   kqueue_changemax = 0;
   kqueue_changecnt = 0;
 

-  return EVMETHOD_KQUEUE;
+  return EVBACKEND_KQUEUE;

 }
 
 }
 

-static void
+void inline_size

 kqueue_destroy (EV_P)
 {
 kqueue_destroy (EV_P)
 {

-  close (kqueue_fd);
-

   ev_free (kqueue_events);
   ev_free (kqueue_changes);
 }
 
   ev_free (kqueue_events);
   ev_free (kqueue_changes);
 }
 

-static void
+void inline_size

 kqueue_fork (EV_P)
 {
 kqueue_fork (EV_P)
 {

-  close (kqueue_fd);
+  close (backend_fd);

 
 

-  while ((kqueue_fd = kqueue ()) < 0)
+  while ((backend_fd = kqueue ()) < 0)

     syserr ("(libev) kqueue");
 
     syserr ("(libev) kqueue");
 

-  fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC);
+  fcntl (backend_fd, F_SETFD, FD_CLOEXEC);

 
   /* re-register interest in fds */
   fd_rearm_all (EV_A);
 
   /* re-register interest in fds */
   fd_rearm_all (EV_A);