- {
- assert( pLeft != nullptr );
- node_scoped_lock l( m_Monitor, *pLeft );
- if ( pNode->m_pLeft.load( memory_model::memory_order_relaxed ) != pLeft )
- return pNode; // retry for pNode
-
- int hL = pLeft->height( memory_model::memory_order_relaxed );
- if ( hL - hR <= 1 )
- return pNode; // retry
-
- node_type * pLRight = child( pLeft, right_child, memory_model::memory_order_relaxed );
- int hLR = pLRight ? pLRight->height( memory_model::memory_order_relaxed ) : 0;
- node_type * pLLeft = child( pLeft, left_child, memory_model::memory_order_relaxed );
- int hLL = pLLeft ? pLLeft->height( memory_model::memory_order_relaxed ) : 0;
-
- if ( hLL > hLR ) {
- // rotate right
- return rotate_right_locked( pParent, pNode, pLeft, hR, hLL, pLRight, hLR );
- }
- else {
- assert( pLRight != nullptr );
- {
- node_scoped_lock lr( m_Monitor, *pLRight );
- if ( pLeft->m_pRight.load( memory_model::memory_order_relaxed ) != pLRight )
- return pNode; // retry
-
- hLR = pLRight->height( memory_model::memory_order_relaxed );
- if ( hLL > hLR )
- return rotate_right_locked( pParent, pNode, pLeft, hR, hLL, pLRight, hLR );
-
- node_type * pLRLeft = child( pLRight, left_child, memory_model::memory_order_relaxed );
- int hLRL = pLRLeft ? pLRLeft->height( memory_model::memory_order_relaxed ) : 0;
- int balance = hLL - hLRL;
- if ( balance >= -1 && balance <= 1 && !((hLL == 0 || hLRL == 0) && !pLeft->is_valued(memory_model::memory_order_relaxed))) {
- // nParent.child.left won't be damaged after a double rotation
- return rotate_right_over_left_locked( pParent, pNode, pLeft, hR, hLL, pLRight, hLRL );
- }
- }
+ assert( pLeft != nullptr );
+ node_scoped_lock l( m_Monitor, *pLeft );
+ if ( pNode->m_pLeft.load( memory_model::memory_order_relaxed ) != pLeft )
+ return pNode; // retry for pNode
+
+ assert( check_node_ordering( pNode, pLeft ) > 0 );