rb_thread_sleep_forever 2526 ext/tk/tcltklib.c rb_thread_sleep_forever(); rb_thread_sleep_forever 448 include/ruby/intern.h void rb_thread_sleep_forever(void); rb_thread_sleep_forever 4412 process.c rb_thread_sleep_forever(); rb_thread_sleep_forever 3748 thread.c rb_thread_sleep_forever();