> if any c extension is loaded which is incompatible with running lockless? It'd be slightly magical to do. You'd probably have a giant RWLock, which is used

> if any c extension is loaded which is incompatible with running lockless? It'd be slightly magical to do. You'd probably have a giant RWLock, which is used for checking whether you're in the "lock free" mode. But at least almost all code could hit it only for read, and it could go away one day.