Attach, pull, registration, writes and deletes raise when started on a
thread already inside a mutation of the same cache (a store call,
decoder, encoder, extractor or updater), instead of running inside it
and corrupting the state being built. Reads stay reentrant. Internal
delegation (put_global, update, delete_global, register_registry,
add_backing_store) goes through private helpers so it is not re-entry.
A pull adopts a global persisted under a key other than __global__ as
that type's global without writing. The first write or delete of it
removes the legacy record in the same call; a failed removal takes the
new record back out. Two globals of one type on disk are still refused.
The lock and unlocked-read comments now state the per-call guarantee.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
5be87c7696