rb_threadptr_add_event_hook  139 vm_trace.c         rb_threadptr_add_event_hook(thval2thread_t(thval), func, events, data, RUBY_EVENT_HOOK_FLAG_SAFE);
rb_threadptr_add_event_hook  152 vm_trace.c         rb_threadptr_add_event_hook(thval2thread_t(thval), func, events, data, hook_flags);
rb_threadptr_add_event_hook  514 vm_trace.c         rb_threadptr_add_event_hook(th, call_trace_func, RUBY_EVENT_ALL, trace, RUBY_EVENT_HOOK_FLAG_SAFE);