1 files changed, 49 insertions, 0 deletions
diff --git a/src/mongo/db/memconcept.h b/src/mongo/db/memconcept.h
new file mode 100644
index 00000000000..737bbd17721
--- /dev/null
+++ b/src/mongo/db/memconcept.h
@@ -0,0 +1,49 @@
+#pragma once
+
+/* The idea here is to 'name' memory pointers so that we can do diagnostics.
+   these diagnostics might involve concurrency or other things.  mainly would
+   be for _DEBUG builds.  Experimental we'll see how useful.
+*/
+
+namespace mongo {
+    namespace memconcept {
+
+        /** these are like fancy enums - you can use them as "types" of things 
+             and see if foo.concept == bar.concept.
+            copyable.
+        */
+        class concept { 
+        public:
+            concept() { *this = err; }
+            const char * toString() const { return c; }
+            static concept err;
+            static concept something;
+            static concept database;
+            static concept other;
+            static concept memorymappedfile;
+            static concept nsdetails;
+            static concept datafileheader;
+            static concept extent;
+            static concept record;
+            static concept deletedrecord;
+            static concept btreebucket;
+        private:
+            const char * c;
+            concept(const char *);
+        };
+        
+        /** file was unmapped or something */
+        void invalidate(void *p, unsigned len=0);
+
+        /** note you can be more than one thing; a datafile header is also the starting pointer
+            for a file */
+        void is(void *p, concept c, std::string desc = "", unsigned len=0);
+
+#if 1
+//#if !defined(_DEBUG)
+        inline void invalidate(void *p, unsigned len) { }
+        inline void is(void *p, concept c, std::string, unsigned) { }
+#endif
+
+    }
+}