From 618ec8b7a5fef3b1ac366d3b6e3961748a6a2533 Mon Sep 17 00:00:00 2001
From: root <root>
Date: Sun, 6 May 2012 13:42:10 +0000
Subject: *** empty log message ***

---
 Changes |  1 -
 ev.c    | 16 ++++++++++++----
 ev.pod  |  8 ++++++++
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/Changes b/Changes
index 3698cde..f7047cd 100644
--- a/Changes
+++ b/Changes
@@ -5,7 +5,6 @@ TODO: EV_STANDALONE == NO_HASSEL (do not use clock_gettime in ev_standalone)
 
 TODO: document WSA_EV_USE_SOCKET in win32 part
 TODO: ^ OR use WSASend/WSARecv on the handle, which always works
-TODO: assert on fd watcher linked list pointing to itself
 TODO: faq, process a thing in each iteration
 	- queueing pending watchers of higher priority from a watcher now invokes
           them in a timely fashion (reported by Denis Bilenko).
diff --git a/ev.c b/ev.c
index c1bd4a7..c2720a7 100644
--- a/ev.c
+++ b/ev.c
@@ -2556,8 +2556,8 @@ void ecb_cold
 ev_verify (EV_P) EV_THROW
 {
 #if EV_VERIFY
-  int i;
-  WL w;
+  int i, j;
+  WL w, w2;
 
   assert (activecnt >= -1);
 
@@ -2566,10 +2566,15 @@ ev_verify (EV_P) EV_THROW
     assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
 
   assert (anfdmax >= 0);
-  for (i = 0; i < anfdmax; ++i)
-    for (w = anfds [i].head; w; w = w->next)
+  for (i = j = 0; i < anfdmax; ++i)
+    for (w = w2 = anfds [i].head; w; w = w->next)
       {
         verify_watcher (EV_A_ (W)w);
+
+        if (++j & 1)
+          w2 = w2->next;
+
+        assert (("libev: io watcher list contains a loop", w != w2));
         assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
         assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
       }
@@ -3252,6 +3257,9 @@ ev_io_start (EV_P_ ev_io *w) EV_THROW
   array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
   wlist_add (&anfds[fd].head, (WL)w);
 
+  /* common bug, apparently */
+  assert (("libev: ev_io_start called with corrupted watcher", ((WL)w)->next != (WL)w));
+
   fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
   w->events &= ~EV__IOFDSET;
 
diff --git a/ev.pod b/ev.pod
index ad893f4..784a2fa 100644
--- a/ev.pod
+++ b/ev.pod
@@ -4240,6 +4240,14 @@ Brian Maher has written a partial interface to libev for lua (at the
 time of this writing, only C<ev_io> and C<ev_timer>), to be found at
 L<http://github.com/brimworks/lua-ev>.
 
+=item Javascript
+
+Node.js (L<http://nodejs.org>) uses libev as the underlying event library.
+
+=item Others
+
+There are others, and I stopped counting.
+
 =back
 
 
-- 
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