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Make event_count maintainance branchless at the expense of an extra shift. Needs benchmarking

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This commit is contained in:
Nick Mathewson 2011-02-23 01:08:54 -05:00
parent efc4dc503a
commit d1cee3b1c7
1 changed files with 18 additions and 12 deletions
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30
event.c
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@ -2418,6 +2418,18 @@ timeout_process(struct event_base *base)
}
}
#if (EVLIST_INTERNAL >> 4) != 1
#error "Mismatch for value of EVLIST_INTERNAL"
#endif
/* These are a fancy way to spell
if (~ev->ev_flags & EVLIST_INTERNAL)
base->event_count--/++;
*/
#define DECR_EVENT_COUNT(base,ev) \
((base)->event_count -= (~((ev)->ev_flags >> 4) & 1))
#define INCR_EVENT_COUNT(base, ev) \
((base)->event_count += (~((ev)->ev_flags >> 4) & 1))
static void
event_queue_remove_inserted(struct event_base *base, struct event *ev)
{
@ -2427,8 +2439,7 @@ event_queue_remove_inserted(struct event_base *base, struct event *ev)
ev, ev->ev_fd, EVLIST_INSERTED);
return;
}
if (~ev->ev_flags & EVLIST_INTERNAL)
base->event_count--;
DECR_EVENT_COUNT(base, ev);
ev->ev_flags &= ~EVLIST_INSERTED;
TAILQ_REMOVE(&base->eventqueue, ev, ev_next);
}
@ -2441,8 +2452,7 @@ event_queue_remove_active(struct event_base *base, struct event *ev)
ev, ev->ev_fd, EVLIST_ACTIVE);
return;
}
if (~ev->ev_flags & EVLIST_INTERNAL)
base->event_count--;
DECR_EVENT_COUNT(base, ev);
ev->ev_flags &= ~EVLIST_ACTIVE;
base->event_count_active--;
TAILQ_REMOVE(&base->activequeues[ev->ev_pri],
@ -2457,8 +2467,7 @@ event_queue_remove_timeout(struct event_base *base, struct event *ev)
ev, ev->ev_fd, EVLIST_TIMEOUT);
return;
}
if (~ev->ev_flags & EVLIST_INTERNAL)
base->event_count--;
DECR_EVENT_COUNT(base, ev);
ev->ev_flags &= ~EVLIST_TIMEOUT;
if (is_common_timeout(&ev->ev_timeout, base)) {
@ -2513,8 +2522,7 @@ event_queue_insert_inserted(struct event_base *base, struct event *ev)
return;
}
if (~ev->ev_flags & EVLIST_INTERNAL)
base->event_count++;
INCR_EVENT_COUNT(base, ev);
ev->ev_flags |= EVLIST_INSERTED;
@ -2531,8 +2539,7 @@ event_queue_insert_active(struct event_base *base, struct event *ev)
return;
}
if (~ev->ev_flags & EVLIST_INTERNAL)
base->event_count++;
INCR_EVENT_COUNT(base, ev);
ev->ev_flags |= EVLIST_ACTIVE;
@ -2552,8 +2559,7 @@ event_queue_insert_timeout(struct event_base *base, struct event *ev)
return;
}
if (~ev->ev_flags & EVLIST_INTERNAL)
base->event_count++;
INCR_EVENT_COUNT(base, ev);
ev->ev_flags |= EVLIST_TIMEOUT;