sys/event/timeout: add event_timeout_is_pending()

sys/include/event/timeout.h

@@ -107,6 +107,18 @@ void event_timeout_set(event_timeout_t *event_timeout, uint32_t timeout);
  */
 void event_timeout_clear(event_timeout_t *event_timeout);
 
+/**
+ * @brief   Check if a timeout event is scheduled to be executed in the future
+ *
+ * @param[in]   event_timeout   event_timout context object to use
+ * @return      true if the event is scheduled, false otherwise
+ */
+static inline bool event_timeout_is_pending(const event_timeout_t *event_timeout)
+{
+    return ztimer_is_set(event_timeout->clock, &event_timeout->timer)
+        || event_is_queued(event_timeout->queue, event_timeout->event);
+}
+
 #ifdef __cplusplus
 }
 #endif

tests/sys/events/main.c

@@ -70,7 +70,7 @@
     const char *text;
 } custom_event_t;
 
 static custom_event_t custom_event = { .super.handler = custom_callback, .text = "CUSTOM CALLBACK" };
 static event_callback_t* event_callback_ptr;
 static event_callback_t noevent_callback = EVENT_CALLBACK_INIT(forbidden_callback, 0);
 
@@ -94,7 +94,7 @@
     uint32_t now = xtimer_now_usec();
 #endif
     expect((now - before >= 100000LU));
     printf("triggered timed callback with arg 0x%08x after %" PRIu32 "us\n", (unsigned)arg, now - before);
     puts("[SUCCESS]");
 }
 
@@ -197,6 +197,7 @@
     before = xtimer_now_usec();
 #endif
     event_timeout_set(&event_timeout, (1 * US_PER_SEC));
+    expect(event_timeout_is_pending(&event_timeout));
 
     event_timeout_t event_timeout_canceled;
 
@@ -205,6 +206,7 @@
                        (event_t *)&noevent_callback);
     event_timeout_set(&event_timeout_canceled, 500 * US_PER_MS);
     event_timeout_clear(&event_timeout_canceled);
+    expect(!event_timeout_is_pending(&event_timeout_canceled));
 
     puts("launching event queue");
     event_loop(&queue);