tevent: optimize adding new zero timer events

Such events were used before we had immediate events.
It's likely that there're a lot of this events
and we need to add new ones in fifo order.

The tricky part is that tevent_common_add_timer()
should not use the optimization as it's used
by broken Samba versions, which don't use
tevent_common_loop_timer_delay() in source3/lib/events.c.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/tevent/tevent_internal.h b/lib/tevent/tevent_internal.h
index 8433333558..b239e7403a 100644
--- a/lib/tevent/tevent_internal.h
+++ b/lib/tevent/tevent_internal.h
@@ -263,6 +263,13 @@ struct tevent_context {
 		tevent_trace_callback_t callback;
 		void *private_data;
 	} tracing;
+
+	/*
+	 * an optimization pointer into timer_events
+	 * used by used by common code via
+	 * tevent_common_add_timer_v2()
+	 */
+	struct tevent_timer *last_zero_timer;
 };
 
 const struct tevent_ops *tevent_find_ops_byname(const char *name);
@@ -292,6 +299,13 @@ struct tevent_timer *tevent_common_add_timer(struct tevent_context *ev,
 					     void *private_data,
 					     const char *handler_name,
 					     const char *location);
+struct tevent_timer *tevent_common_add_timer_v2(struct tevent_context *ev,
+						TALLOC_CTX *mem_ctx,
+					        struct timeval next_event,
+					        tevent_timer_handler_t handler,
+					        void *private_data,
+					        const char *handler_name,
+					        const char *location);
 struct timeval tevent_common_loop_timer_delay(struct tevent_context *);
 
 void tevent_common_schedule_immediate(struct tevent_immediate *im,