I've also wondered what parts of syncing run inside a
transaction. ASDF compilation prevents async interruptions
at least but of course another thread could be in the middle
of some op when the sync happens.
Leslie
Synchronization in the sense of on-disk instance updates are all
degree-2 transactional as I recall. However the rub is the caching of
class schema references in the slots of persistent-metaclasses
instances. The transaction system doesn't help with side effects to
non-DB objects. Generally, schema updates are done by a single
thread, but they may interfere with other threads that, for instance,
are doing a lazy schema update on an access to a non-updated instance.
Ian
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