initialize thread_delayed_free field atomically
@@ -122,7 +122,7 @@ mi_heap_t _mi_heap_main = {
&tld_main,
MI_SMALL_PAGES_EMPTY,
MI_PAGE_QUEUES_EMPTY,
- NULL,
+ ATOMIC_VAR_INIT(NULL),
0, // thread id
MI_INIT_COOKIE, // initial cookie
{ MI_INIT_COOKIE, MI_INIT_COOKIE }, // the key of the main heap can be fixed (unlike page keys that need to be secure!)
