--- a/src/hotspot/share/oops/klass.cpp Mon Nov 25 12:32:40 2019 +0100
+++ b/src/hotspot/share/oops/klass.cpp Mon Nov 25 12:33:15 2019 +0100
@@ -436,7 +436,7 @@
// Note that the prev_first_subklass is always alive, meaning no sibling_next links
// are ever created to not alive klasses. This is an important invariant of the lock-free
// cleaning protocol, that allows us to safely unlink dead klasses from the sibling list.
- if (Atomic::cmpxchg(this, &super->_subklass, prev_first_subklass) == prev_first_subklass) {
+ if (Atomic::cmpxchg(&super->_subklass, prev_first_subklass, this) == prev_first_subklass) {
return;
}
}
@@ -451,7 +451,7 @@
return;
}
// Try to fix _subklass until it points at something not dead.
- Atomic::cmpxchg(subklass->next_sibling(), &_subklass, subklass);
+ Atomic::cmpxchg(&_subklass, subklass, subklass->next_sibling());
}
}