[Libevent-users] EV_PERSIST behavior

[Phil Oleson]

Christopher Layne wrote:
> I understand that EV_PERSIST basically means that one does not have to
> continually reschedule the event upon the event occuring.
> 
> Consider the following simple test case and my following question on it...
> 
<snip>
> Documentation for that is here:
>      The function event_add() schedules the execution of the ev event when
>      the event specified in event_set() occurs or in at least the time speci-
>      fied in the tv.  If tv is NULL, no timeout occurs and the function
>      will only be called if a matching event occurs on the file descriptor.
>      The event in the ev argument must be already initialized by event_set()
>      and may not be used in calls to event_set() until it has timed out or
>                        implies event_del() -->   ^^^^^^^^^^^^^^^^^^^^^
>      been removed with event_del().  If the event in the ev argument already
>      has a scheduled timeout, the old timeout will be replaced by the new one.
> 
> Just took a bit to find it in the manpage. It might want to be more explictly
> stated in the documentation.

Well, I've dealt with this before, so I'll give you the rundown.
libevent uses clock_gettime() and CLOCK_MONOTONIC within it's queues
to keep events happening across time changes on the system.

So..  To fix your implementation you will need to do something like I did.
I reimplemented libevents' gettime() function (because it's not exposed
via event.h) and use it instead of calling time(NULL);

-Phil.