Initial community commit

Src/replicant/nu/lfitem.h

@@ -0,0 +1,23 @@
+#pragma once
+
+/* This data structure holds one item, and returns you the old item when you replace it 
+   it's sort of a "stack of 1" */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+	typedef struct lfitem_struct_t 
+	{
+		void * volatile item;
+	}  lfitem_value_t, *lfitem_t;
+
+
+	void lfitem_init(lfitem_t item);
+	void *lfitem_get(lfitem_t item);
+	void *lfitem_set(lfitem_t item, const void *value);
+	void *lfitem_set_if_zero(lfitem_t item, void *value);
+
+#ifdef __cplusplus
+}
+#endif