EventQueue: allow passing (0, NULL) on static queue creation

Author: maciejbocianski

events/source/EventQueue.cpp

@@ -24,9 +24,9 @@ namespace events {
 EventQueue::EventQueue(unsigned event_size, unsigned char *event_pointer)
 {
     if (event_size == 0) {
-        // As static queue (EventQueue(0)) won't perform any access to its dummy buffer
-        // set 1B dummy buffer as pointer to itself
-        equeue_create_inplace(&_equeue, 1, this);
+        // As static queue (EventQueue(0)) won't perform any access to its data buffer
+        // we can pass (0, NULL)
+        equeue_create_inplace(&_equeue, 0, NULL);
     } else {
         if (!event_pointer) {
             equeue_create(&_equeue, event_size);

events/source/equeue.c

@@ -22,7 +22,7 @@
 #include <string.h>
 
 // check if the event is allocaded by user - event address is outside queues internal buffer address range
-#define EQUEUE_IS_USER_ALLOCATED_EVENT(e) (((uintptr_t)(e) < (uintptr_t)q->buffer) || ((uintptr_t)(e) > ((uintptr_t)q->slab.data)))
+#define EQUEUE_IS_USER_ALLOCATED_EVENT(e) ((q->buffer == NULL) || ((uintptr_t)(e) < (uintptr_t)q->buffer) || ((uintptr_t)(e) > ((uintptr_t)q->slab.data)))
 
 // calculate the relative-difference between absolute times while
 // correctly handling overflow conditions