gistfile1.diff

diff -ur libevent-1.3b.original/event.c libevent-1.3b/event.c
--- libevent-1.3b.original/event.c      2007-02-16 09:49:06.000000000 +0900
+++ libevent-1.3b/event.c       2010-08-15 00:58:14.000000000 +0900
@@ -790,13 +790,13 @@
                docount = 0;
 
        if (docount)
-               base->event_count--;
+               __sync_sub_and_fetch(&(base->event_count), 1);
 
        ev->ev_flags &= ~queue;
        switch (queue) {
        case EVLIST_ACTIVE:
                if (docount)
-                       base->event_count_active--;
+                       __sync_sub_and_fetch(&(base->event_count_active), 1);
                TAILQ_REMOVE(base->activequeues[ev->ev_pri],
                    ev, ev_active_next);
                break;
@@ -832,13 +832,13 @@
                docount = 0;
 
        if (docount)
-               base->event_count++;
+               __sync_add_and_fetch(&(base->event_count), 1);
 
        ev->ev_flags |= queue;
        switch (queue) {
        case EVLIST_ACTIVE:
                if (docount)
-                       base->event_count_active++;
+                       __sync_add_and_fetch(&(base->event_count_active), 1);
                TAILQ_INSERT_TAIL(base->activequeues[ev->ev_pri],
                    ev,ev_active_next);
                break;