Re: [Libevent-users] Re: Infinite loop in libevent-1.4.14b-stable

[Nick Mathewson <nickm@xxxxxxxxxxxxx>]

On Fri, Mar 2, 2012 at 10:00 AM, Daniel Janzon <janzon@xxxxxxxxx> wrote:
> I found a similar report in the mailing list archive, where it was
> concluded that this can happen when event_set is called after
> event_add. In this case, however, the only place in the code where
> event_set is called, is on the line before even_add.

That isn't a guarantee unless you're *certain* that the memory that
you're calling event_set() on is not a currently added event.

Libevent 2.0's debug-mode feature would catch this case, if you have a
chance to build against 2.0 some time and turn on debug mode.

As a fail-safe mode, you can stop using event_set() and write your own
(forward-compatible!) event_new() and event_free(), so you don't need
to worry about accidentally re-assigning an event.

Alternatively, if the memory that you're calling event_set() on has a
known initial state (for example, you're getting it from calloc()),
you could check its ev_flags values before you call  event_set on it;
that might turn up the problem.

yrs,
-- 
Nick
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