sync generic_ivtbl

generic_ivtbl is a process global table to maintain instance variables
for non T_OBJECT/T_CLASS/... objects. So we need to protect them
for multi-Ractor exection.

Hint: we can make them Ractor local for unshareable objects, but
      now it is premature optimization.

1 files changed, 1 insertions, 1 deletions

diff --git a/variable.h b/variable.h
index 2f010b6508..4d71f87bc5 100644
--- a/variable.h
+++ b/variable.h
@@ -16,6 +16,6 @@ struct gen_ivtbl {
     VALUE ivptr[FLEX_ARY_LEN];
 };
 
-struct st_table *rb_ivar_generic_ivtbl(VALUE obj);
+int rb_ivar_generic_ivtbl_lookup(VALUE obj, struct gen_ivtbl **);
 
 #endif /* RUBY_TOPLEVEL_VARIABLE_H */