[ViewVC] Diff of: cvs/libev/ev.pod

Comparing libev/ev.pod (file contents):
Revision 1.461 by root, Wed Jan 22 12:15:52 2020 UTC vs.
Revision 1.462 by root, Wed Jan 22 13:06:53 2020 UTC

 =item ev_io_init (ev_io *, callback, int fd, int events)
 =item ev_io_set (ev_io *, int fd, int events)
 Configures an C<ev_io> watcher. The C<fd> is the file descriptor to
-receive events for and C<events> is either C<EV_READ>, C<EV_WRITE> or
+receive events for and C<events> is either C<EV_READ>, C<EV_WRITE>, both
-C<EV_READ | EV_WRITE>, to express the desire to receive the given events.
+C<EV_READ | EV_WRITE> or C<0>, to express the desire to receive the given
+events.
+Note that setting the C<events> to C<0> and starting the watcher is
+supported, but not specially optimized - if your program sometimes happens
+to generate this combination this is fine, but if it is easy to avoid
+starting an io watcher watching for no events you should do so.
 =item ev_io_modify (ev_io *, int events)
 Similar to C<ev_io_set>, but only changes the event mask. Using this might
 be faster with some backends, as libev can assume that the C<fd> still

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