Moved dcb_hashtable_stats from hastable.c to dcb.c to break dependency between hashtable and the rest of the maxscale. Added check fields to hashtable structure.

utils/skygw_debug.h

@@ -113,7 +113,8 @@ typedef enum skygw_chk_t {
     CHK_NUM_FNAMES,
     CHK_NUM_LOGMANAGER,
     CHK_NUM_FILE,
-    CHK_NUM_BLOCKBUF
+    CHK_NUM_BLOCKBUF,
+    CHK_NUM_HASHTABLE
 } skygw_chk_t;
 
 # define STRBOOL(b) ((b) ? "TRUE" : "FALSE")
@@ -319,4 +320,10 @@ typedef enum skygw_chk_t {
                             "Block buf under- or overflow");    \
     }
 
+#define CHK_HASHTABLE(t) {                                  \
+    ss_info_dassert(t->ht_chk_top == CHK_NUM_HASHTABLE &&   \
+                    t->ht_chk_tail == CHK_NUM_HASHTABLE,    \
+                    "Hashtable under- or overflow");        \
+    }
+
 #endif /* SKYGW_DEBUG_H */