atomic_add: get old count atomically

moonlightsh · Nov 27, 2023 · 983932e · 983932e
1 parent ac73451
commit 983932e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/mman.c b/src/mman.c
@@ -43,7 +43,7 @@ s_allocator smalloc_allocator = {malloc, free};
 static CSPTR_INLINE size_t atomic_add(volatile size_t *count, const size_t limit, const size_t val) {
     size_t old_count, new_count;
     do {
-      old_count = *count;
+      old_count = __sync_fetch_and_add(count, 0);
       if (old_count == limit)
           abort();
       new_count = old_count + val;