initial commit

oscar64/include/opp/slab.h

@@ -0,0 +1,80 @@
+#ifndef OPP_SLAB_H
+#define OPP_SLAB_H
+
+template<class T, int N>
+class slabptr
+{
+public:
+	char	index;
+
+	slabptr(void)
+		: index(N)
+		{}
+
+	slabptr(char i)
+		: index(i)
+		{}
+
+	slabptr(const slabptr & i)
+		: index(i.index)
+		{}
+
+	auto operator-> ();
+	auto & operator* ();
+};
+
+template <class T, int N>
+class slab
+{
+protected:
+	static __striped	T	buffer[N];
+	static	char		head;
+	static	char		next[N];
+
+public:
+	typedef slabptr<T, N>	ptr;
+
+	static void init(void);
+	static auto alloc(void);
+	static void free(ptr p);
+};
+
+
+template<class T, int N>
+inline auto slabptr<T, N>::operator-> ()
+{
+	return slab<T, N>::buffer + index;
+}
+
+template<class T, int N>
+inline auto & slabptr<T, N>::operator* ()
+{
+	return slab<T, N>::buffer[index];	
+}
+
+
+template <class T, int N>
+void slab<T, N>::init(void)
+{
+	head = 0;
+	for(char i=0; i<N; i++)
+		next[i] = i + 1;
+}
+
+template <class T, int N>
+auto slab<T, N>::alloc(void)
+{
+	char i = head;
+	head = next[head];	
+	return slabptr<T, N>(i);	
+}
+
+template <class T, int N>
+void slab<T, N>::free(slabptr<T, N> p)
+{
+	next[p.index] = head;
+	head = p.index;
+}
+
+#endif
+