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watchlist: Allow watch CBs to call watchlist_destroy

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If during WATCHLIST_NOTIFY{,_MATCHES,_NO_ARGS} one of the watch
notify callback triggers a call to watchlist_destroy, give up calling
remaining watches and destroy the watchlist without crashing.  This is
useful in frame-xchg.c (P2P use case) where a frame watch may trigger
a move to a new state after receiving a specific frame, and remove one
group of frame watches (including its watchlist) to create a different
group.
This commit is contained in:
Andrew Zaborowski 2020-03-18 15:45:27 +01:00 committed by Denis Kenzior
parent a2006a3d29
commit 9e18552fe7
2 changed files with 23 additions and 4 deletions
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5
src/watchlist.c
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@ -127,6 +127,11 @@ static void __watchlist_clear(struct watchlist *watchlist)
void watchlist_destroy(struct watchlist *watchlist)
{
if (watchlist->in_notify) {
watchlist->pending_destroy = true;
return;
}
__watchlist_clear(watchlist);
l_queue_destroy(watchlist->items, NULL);
watchlist->items = NULL;

20
src/watchlist.h
View File

@ -38,6 +38,7 @@ struct watchlist {
struct l_queue *items;
bool in_notify : 1;
bool stale_items : 1;
bool pending_destroy : 1;
const struct watchlist_ops *ops;
};
@ -69,9 +70,13 @@ void __watchlist_prune_stale(struct watchlist *watchlist);
if (item->id == 0) \
continue; \
t(args, item->notify_data); \
if ((watchlist)->pending_destroy) \
break; \
} \
(watchlist)->in_notify = false; \
if ((watchlist)->stale_items) \
if ((watchlist)->pending_destroy) \
watchlist_destroy(watchlist); \
else if ((watchlist)->stale_items) \
__watchlist_prune_stale(watchlist); \
} while (false) \
@ -91,9 +96,14 @@ void __watchlist_prune_stale(struct watchlist *watchlist);
continue; \
\
t(args, item->notify_data); \
\
if ((watchlist)->pending_destroy) \
break; \
} \
(watchlist)->in_notify = false; \
if ((watchlist)->stale_items) \
if ((watchlist)->pending_destroy) \
watchlist_destroy(watchlist); \
else if ((watchlist)->stale_items) \
__watchlist_prune_stale(watchlist); \
} while (false)
@ -109,8 +119,12 @@ void __watchlist_prune_stale(struct watchlist *watchlist);
if (item->id == 0) \
continue; \
t(item->notify_data); \
if ((watchlist)->pending_destroy) \
break; \
} \
(watchlist)->in_notify = false; \
if ((watchlist)->stale_items) \
if ((watchlist)->pending_destroy) \
watchlist_destroy(watchlist); \
else if ((watchlist)->stale_items) \
__watchlist_prune_stale(watchlist); \
} while (false)