Author :
Azat Khuzhin
Date :
2018-02-27 21:12:14
Hash :08a0d366 Message :Fix base unlocking in event_del() if event_base_set() runned in another thread
Image next situation:
T1: T2:
event_del_()
lock the event.ev_base.th_base_lock
event_del_nolock_() event_set_base()
unlock the event.ev_base.th_base_lock
In this case we will unlock the wrong base after event_del_nolock_()
returns, and deadlock is likely to happens, since event_base_set() do
not check any mutexes (due to it is possible to do this only if event is
not inserted anywhere).
So event_del_() has to cache the base before removing the event, and
cached base.th_base_lock after.
Azat Khuzhin