From 46888a1eaf769281d0e524e7bbf2e94e047f899f Mon Sep 17 00:00:00 2001
From: Hauke Petersen <hauke.petersen@fu-berlin.de>
Date: Thu, 19 Apr 2018 16:41:13 +0200
Subject: [PATCH] sys/event: allow calling event_post multiple times
---
sys/event/event.c | 7 ++++---
sys/include/event.h | 5 +++++
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/sys/event/event.c b/sys/event/event.c
index 570d7e232f..9e6ac213fe 100644
--- a/sys/event/event.c
+++ b/sys/event/event.c
@@ -23,11 +23,12 @@ void event_queue_init(event_queue_t *queue)
void event_post(event_queue_t *queue, event_t *event)
{
- assert(!event->list_node.next);
- assert(queue->waiter);
+ assert(queue && queue->waiter && event);
unsigned state = irq_disable();
- clist_rpush(&queue->event_list, &event->list_node);
+ if (!event->list_node.next) {
+ clist_rpush(&queue->event_list, &event->list_node);
+ }
irq_restore(state);
thread_flags_set(queue->waiter, THREAD_FLAG_EVENT);
diff --git a/sys/include/event.h b/sys/include/event.h
index 7072de41e6..0727459c91 100644
--- a/sys/include/event.h
+++ b/sys/include/event.h
@@ -149,6 +149,11 @@ void event_queue_init(event_queue_t *queue);
/**
* @brief Queue an event
*
+ * The given event will be posted on the given @p queue. If the event is already
+ * queued when calling this function, the event will not be touched and remain
+ * in the previous position on the queue. So reposting an event while it is
+ * already on the queue will have no effect.
+ *
* @param[in] queue event queue to queue event in
* @param[in] event event to queue in event queue
*/
--
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