From 1fa403c16d9262ee9541bd969f372d00bd62b3e8 Mon Sep 17 00:00:00 2001
From: root <root>
Date: Sun, 1 Jun 2008 01:13:59 +0000
Subject: *** empty log message ***

---
 ev.pod | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'ev.pod')

diff --git a/ev.pod b/ev.pod
index 670f7ce..36c21e1 100644
--- a/ev.pod
+++ b/ev.pod
@@ -3376,6 +3376,15 @@ additional extensions:
 
 =over 4
 
+=item C<void (*)(ev_watcher_type *, int revents)> must have compatible
+calling conventions regardless of C<ev_watcher_type *>.
+
+Libev assumes not only that all watcher pointers have the same internal
+structure (guaranteed by POSIX but not by ISO C for example), but it also
+assumes that the same (machine) code can be used to call any watcher
+callback: The watcher callbacks have different type signatures, but libev
+calls them using an C<ev_watcher *> internally.
+
 =item C<sig_atomic_t volatile> must be thread-atomic as well
 
 The type C<sig_atomic_t volatile> (or whatever is defined as
-- 
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