[Libevent-users] Callback after all events from the current batch have been cleared

[Zack Weinberg <zackw@xxxxxxxxx>]

I'm looking at a bug which appears to come down to: some of my event 
callbacks deallocate events, bufferevents, and/or their callback data. 
Under difficult-to-reproduce circumstances, libevent appears to queue up 
calls to my callbacks (possibly implicitly via internal control flow), 
and call them even though the associated events and data have been 
deallocated.  I wish to apply a large hammer to this problem: delay 
deallocations until after all queued-up callbacks have been processed, 
but before libevent asks the OS for the next batch of events.

I *think* this can be done with a timer event which is assigned a lower 
priority than all other events in the program, and which is 
event_add()ed with an immediate timeout whenever there are deallocations 
pending.

Will this work?

Is there a better way to do this?

Thanks,
zw
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