* libguile/finalizers.h:
* libguile/finalizers.c (run_finalizers_async_thunk): Call the new
scm_run_finalizers helper.
(scm_set_automatic_finalization_enabled, scm_run_finalizers): New
functions.
(scm_init_finalizers): Only set a finalizer notifier if automatic
finalization is enabled.
* doc/ref/libguile-smobs.texi (Garbage Collecting Smobs): Add discussion
of concurrency.
* doc/ref/api-smobs.texi (Smobs): Document new functions.