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dbEvent: try to detect possible "stall"

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event_read() should not return if the last callback
was delivered with eventsRemaining!=0
This commit is contained in:
Michael Davidsaver
2023-01-22 13:28:10 -08:00
parent e1c1bb8b1b
commit b6626e4f60
1 changed files with 8 additions and 0 deletions
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8
modules/database/src/ioc/db/dbEvent.c
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@@ -76,6 +76,7 @@ struct event_que {
unsigned short quota; /* the number of assigned entries*/
unsigned short nDuplicates; /* N events duplicated on this q */
unsigned short nCanceled; /* the number of canceled entries */
unsigned possibleStall;
};
struct event_user {
@@ -934,6 +935,7 @@ void db_post_single_event (dbEventSubscription event)
static int event_read ( struct event_que *ev_que )
{
db_field_log *pfl;
int notifiedRemaining = 0;
void ( *user_sub ) ( void *user_arg, struct dbChannel *chan,
int eventsRemaining, db_field_log *pfl );
@@ -1012,6 +1014,7 @@ static int event_read ( struct event_que *ev_que )
/* Issue user callback */
( *user_sub ) ( pevent->user_arg, pevent->chan,
eventsRemaining, pfl );
notifiedRemaining = eventsRemaining;
}
LOCKEVQUE (ev_que);
@@ -1038,6 +1041,11 @@ static int event_read ( struct event_que *ev_que )
db_delete_field_log(pfl);
}
if(notifiedRemaining && !ev_que->possibleStall) {
ev_que->possibleStall = 1;
errlogPrintf(ERL_WARNING " dbEvent possible queue stall\n");
}
UNLOCKEVQUE (ev_que);
return DB_EVENT_OK;