openflow build environment setup

openflow/include/click/bighashmap_arena.hh

@@ -0,0 +1,101 @@
+// -*- c-basic-offset: 4; related-file-name: "../../lib/bighashmap_arena.cc" -*-
+#ifndef CLICK_BIGHASHMAP_ARENA_HH
+#define CLICK_BIGHASHMAP_ARENA_HH
+CLICK_DECLS
+
+class HashMap_Arena { public:
+
+    HashMap_Arena(uint32_t element_size);
+
+    void use()			{ _refcount++; }
+    void unuse();
+
+    bool detached() const	{ return _detached; }
+    void detach()		{ _detached = true; }
+
+    void *alloc();
+    void free(void *);
+
+  private:
+
+    struct Link {
+	Link *next;
+    };
+    Link *_free;
+
+    enum { NELEMENTS = 127 };	// not a power of 2 so we don't fall into a
+				// too-large bucket
+    char *_cur_buffer;
+    int _buffer_pos;
+
+    uint32_t _element_size;
+
+    char **_buffers;
+    int _nbuffers;
+    int _buffers_cap;
+
+    uint32_t _refcount;
+    bool _detached;
+
+    HashMap_Arena(const HashMap_Arena &);
+    ~HashMap_Arena();
+    HashMap_Arena &operator=(const HashMap_Arena &);
+
+    void *hard_alloc();
+
+    friend struct Link;		// shut up, compiler
+
+};
+
+class HashMap_ArenaFactory { public:
+
+    HashMap_ArenaFactory();
+    virtual ~HashMap_ArenaFactory();
+
+    static void static_initialize();
+    static void static_cleanup();
+
+    static HashMap_Arena *get_arena(uint32_t, HashMap_ArenaFactory * =0);
+    virtual HashMap_Arena *get_arena_func(uint32_t);
+
+  private:
+
+    HashMap_Arena **_arenas[2];
+    int _narenas[2];
+
+    static HashMap_ArenaFactory *the_factory;
+
+};
+
+inline void
+HashMap_Arena::unuse()
+{
+    _refcount--;
+    if (_refcount <= 0)
+	delete this;
+}
+
+inline void *
+HashMap_Arena::alloc()
+{
+    if (_free) {
+	void *ret = _free;
+	_free = _free->next;
+	return ret;
+    } else if (_buffer_pos > 0) {
+	_buffer_pos -= _element_size;
+	return _cur_buffer + _buffer_pos;
+    } else
+	return hard_alloc();
+}
+
+inline void
+HashMap_Arena::free(void *v)
+{
+    Link *link = reinterpret_cast<Link *>(v);
+    link->next = _free;
+    _free = link;
+}
+
+CLICK_ENDDECLS
+#endif