add dbtempreleasecond that only releases if you have a single level lock

db/db.h

@@ -156,6 +156,29 @@ namespace mongo {
         }
     };
 
+    /**
+       only does a temp release if we're not nested and have a lock
+     */
+    struct dbtempreleasecond {
+        dbtemprelease * real;
+        int locktype;
+        
+        dbtempreleasecond(){
+            real = 0;
+            locktype = dbMutex.getState();
+            if ( locktype == 1 || locktype == -1 )
+                real = new dbtemprelease();
+        }
+        
+        ~dbtempreleasecond(){
+            if ( real ){
+                delete real;
+                real = 0;
+            }
+        }
+        
+    };
+
 } // namespace mongo
 
 #include "dbinfo.h"

db/query.cpp

@@ -155,7 +155,7 @@ namespace mongo {
                 cc->updateLocation();
                 cc->setDoingDeletes( false );
                 {
-                    dbtemprelease unlock;
+                    dbtempreleasecond unlock;
                 }
                 if ( ClientCursor::find( id , false ) == 0 ){
                     cc.reset( 0 );

jstests/remove8.js

@@ -0,0 +1,21 @@
+
+t = db.remove8;
+t.drop();
+
+N = 1000;
+
+function fill(){
+    for ( var i=0; i<N; i++ ){
+        t.save( { x : i } );
+    }
+}
+
+fill();
+assert.eq( N , t.count() , "A" );
+t.remove( {} )
+assert.eq( 0 , t.count() , "B" );
+
+fill();
+assert.eq( N , t.count() , "C" );
+db.eval( function(){ db.remove8.remove( {} ); } )
+assert.eq( 0 , t.count() , "D" );