rb_struct_define_without_accessor_under  889 include/ruby/intern.h VALUE rb_struct_define_without_accessor_under(VALUE outer, const char *class_name, VALUE super, rb_alloc_func_t alloc, ...);
rb_struct_define_without_accessor_under 1252 thread_sync.c      rb_cQueue = rb_struct_define_without_accessor_under(
rb_struct_define_without_accessor_under 1277 thread_sync.c      rb_cSizedQueue = rb_struct_define_without_accessor_under(
rb_struct_define_without_accessor_under 1297 thread_sync.c      rb_cConditionVariable = rb_struct_define_without_accessor_under(