foo

core/refcount.c

@@ -0,0 +1,17 @@
+#include <zinnia/refcount.h>
+#include <stdatomic.h>
+
+void refcount_init(struct refcount* rc) {
+    atomic_store_explicit(&rc->count, 1, memory_order_relaxed);
+}
+
+void refcount_inc(struct refcount* rc) {
+    atomic_fetch_add_explicit(&rc->count, 1, memory_order_relaxed);
+}
+
+bool refcount_dec(struct refcount* rc) {
+    if (atomic_fetch_sub_explicit(&rc->count, 1, memory_order_release) != 1)
+        return false;
+    atomic_thread_fence(memory_order_acquire);
+    return true;
+}