cuberite/libevent
1
0
Fork 0
mirror of https://github.com/cuberite/libevent.git synced 2025-08-04 01:36:23 -04:00
Code Issues Packages Projects Releases Wiki Activity

Return from event_del() after the last event callback termination

Browse Source 
Delete the event from the queue before blocking for the current
event callback termination.

Ensures that no callback is being executed when event_del() returns,
hence making this function a secure mechanism to access data which is
handled in the event callack.

Fixes: #236
Fixes: #225
Refs: 6b4b77a
Fixes: del_wait
(cherry picked from commit 0b4b0efdb8ee710ccae5bad320fc24843fd428e5)
This commit is contained in:
José Luis Millán 2015-04-13 08:54:52 +02:00 committed by Azat Khuzhin
parent 23db747652
commit 876c7ac7ff
No known key found for this signature in database
GPG Key ID: B86086848EF8686D
1 changed files with 15 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
event.c
View File

@ -2780,21 +2780,7 @@ event_del_nolock_(struct event *ev, int blocking)
}
}
/* If the main thread is currently executing this event's callback,
* and we are not the main thread, then we want to wait until the
* callback is done before we start removing the event. That way,
* when this function returns, it will be safe to free the
* user-supplied argument. */
base = ev->ev_base;
#ifndef EVENT__DISABLE_THREAD_SUPPORT
if (blocking != EVENT_DEL_NOBLOCK &&
base->current_event == event_to_event_callback(ev) &&
!EVBASE_IN_THREAD(base) &&
(blocking == EVENT_DEL_BLOCK || !(ev->ev_events & EV_FINALIZE))) {
++base->current_event_waiters;
EVTHREAD_COND_WAIT(base->current_event_cond, base->th_base_lock);
}
#endif
EVUTIL_ASSERT(!(ev->ev_flags & ~EVLIST_ALL));
@ -2841,6 +2827,21 @@ event_del_nolock_(struct event *ev, int blocking)
event_debug_note_del_(ev);
/* If the main thread is currently executing this event's callback,
* and we are not the main thread, then we want to wait until the
* callback is done before returning. That way, when this function
* returns, it will be safe to free the user-supplied argument.
*/
#ifndef EVENT__DISABLE_THREAD_SUPPORT
if (blocking != EVENT_DEL_NOBLOCK &&
base->current_event == event_to_event_callback(ev) &&
!EVBASE_IN_THREAD(base) &&
(blocking == EVENT_DEL_BLOCK || !(ev->ev_events & EV_FINALIZE))) {
++base->current_event_waiters;
EVTHREAD_COND_WAIT(base->current_event_cond, base->th_base_lock);
}
#endif
return (res);
}