sketch out ptr graph building data structures

src/ptr_graph_cache/ptr_graph_cache.c

@@ -191,6 +191,13 @@ ptg_builder_thread__entry_point(void *p)
       }
     }
     
+    //- rjf: do task
+    if(got_task)
+    {
+      
+    }
+    
+    
     //- rjf: commit results to cache
     if(got_task) OS_MutexScopeW(stripe->rw_mutex)
     {
@@ -255,8 +262,7 @@ ptg_evictor_thread__entry_point(void *p)
              n->is_working == 0)
           {
             DLLRemove(slot->first, slot->last, n);
-            arena_clear(n->node_arena);
-            arena_clear(n->link_arena);
+            arena_clear(n->arena);
             SLLStackPush(stripe->free_node, n);
           }
         }

src/ptr_graph_cache/ptr_graph_cache.h

@@ -31,13 +31,61 @@ struct PTG_Link
   U32 to;
 };
 
+typedef struct PTG_NodeChunkNode PTG_NodeChunkNode;
+struct PTG_NodeChunkNode
+{
+  PTG_NodeChunkNode *next;
+  PTG_Node *v;
+  U64 count;
+  U64 cap;
+};
+
+typedef struct PTG_NodeChunkList PTG_NodeChunkList;
+struct PTG_NodeChunkList
+{
+  PTG_NodeChunkNode *first;
+  PTG_NodeChunkNode *last;
+  U64 chunk_count;
+  U64 total_count;
+};
+
+typedef struct PTG_NodeArray PTG_NodeArray;
+struct PTG_NodeArray
+{
+  PTG_Node *v;
+  U64 count;
+};
+
+typedef struct PTG_LinkChunkNode PTG_LinkChunkNode;
+struct PTG_LinkChunkNode
+{
+  PTG_LinkChunkNode *next;
+  PTG_Link *v;
+  U64 count;
+  U64 cap;
+};
+
+typedef struct PTG_LinkChunkList PTG_LinkChunkList;
+struct PTG_LinkChunkList
+{
+  PTG_LinkChunkNode *first;
+  PTG_LinkChunkNode *last;
+  U64 chunk_count;
+  U64 total_count;
+};
+
+typedef struct PTG_LinkArray PTG_LinkArray;
+struct PTG_LinkArray
+{
+  PTG_Link *v;
+  U64 count;
+};
+
 typedef struct PTG_Graph PTG_Graph;
 struct PTG_Graph
 {
-  PTG_Node *nodes;
-  U64 nodes_count;
-  PTG_Link *links;
-  U64 links_count;
+  PTG_NodeArray nodes;
+  PTG_LinkArray links;
 };
 
 typedef struct PTG_GraphNode PTG_GraphNode;
@@ -58,8 +106,7 @@ struct PTG_GraphNode
   B32 is_working;
   
   // rjf: content
-  Arena *node_arena;
-  Arena *link_arena;
+  Arena *arena;
   PTG_Graph graph;
 };