Merge #19966

19966: sys/event: add event_is_queued() r=benpicco a=fabian18



Co-authored-by: Fabian Hüßler <fabian.huessler@ml-pa.com>

sys/event/event.c

@@ -22,7 +22,7 @@
  */
 
 #include <assert.h>
-
+#include <stdbool.h>
 #include <string.h>
 
 #include "event.h"
@@ -60,6 +60,17 @@ void event_cancel(event_queue_t *queue, event_t *event)
     irq_restore(state);
 }
 
+bool event_is_queued(const event_queue_t *queue, const event_t *event)
+{
+    assert(queue);
+    assert(event);
+
+    unsigned state = irq_disable();
+    bool result = clist_find(&queue->event_list, &event->list_node);
+    irq_restore(state);
+    return result;
+}
+
 event_t *event_get(event_queue_t *queue)
 {
     unsigned state = irq_disable();

sys/include/event.h

@@ -97,6 +97,7 @@
 #define EVENT_H
 
 #include <stdint.h>
+#include <stdbool.h>
 #include <string.h>
 
 #include "assert.h"
@@ -276,6 +277,17 @@ void event_post(event_queue_t *queue, event_t *event);
  */
 void event_cancel(event_queue_t *queue, event_t *event);
 
+/**
+ * @brief   Check if an event is already queued
+ *
+ * @param[in]   queue   event queue to check
+ * @param[in]   event   event to check
+ *
+ * @returns true if @p event is in @p queue
+ * @returns false otherwise
+ */
+bool event_is_queued(const event_queue_t *queue, const event_t *event);
+
 /**
  * @brief   Get next event from event queue, non-blocking
  *