I'm having trouble terminating event loops using event_base_loopexit().
The way it works, as I understand it, is by scheduling an event that
sets the event_gotterm flag, which will cause the loop to quit after
its current iteration. Here's the sequence of function calls:
event_base_loopexit()
event_once()
evtimer_set() /* this sets ev_base to current_base */
event_add()
This uses the event loop associated with current_base to run the
callback (event_loopexit_cb()) instead of the base that was passed to
event_base_loopexit(), which seems weird, but okay. However, if
there's no loop running with current_base, event_loopexit_cb() never
gets called so my loop never terminates. One could imagine this
happening if you do something like:
base_1 = event_init();
base_2 = event_init(); /* current_base is now base_2 */
event_base_loop(base_1, 0);
/* somehow call event_base_loopexit(base_1, 0) now */
Why do we schedule a callback to set event_gotterm? This is a boolean
flag and we only care if it's zero or non-zero, so why do we need to
synchronize access to it?
Harry
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