added diagnostics

src/db/dbSubscriptionIO.cpp

@@ -89,3 +89,19 @@ int dbSubscriptionIO::begin ( struct dbAddr &addr, unsigned mask )
     }
 }
 
+void dbSubscriptionIO::show ( unsigned level ) const
+{
+    printf ( "Data base subscription IO at %p\n", this );
+    if ( level > 0u ) {
+        short tmpType;
+        if ( this->type < SHRT_MAX ) {
+            tmpType = static_cast < short > ( this->type );
+            printf ( "\ttype %s, count %lu, channel at %p\n",
+                dbf_type_to_text ( tmpType ), this->count, &this->chan );
+        }
+        else {
+            printf ("strange type !, count %lu, channel at %p\n",
+                this->count, &this->chan );
+        }
+    }
+}