GC_darwin_register_mach_handler_thread   20 gc/include/private/darwin_stop_world.h void GC_darwin_register_mach_handler_thread(mach_port_t thread);
GC_darwin_register_mach_handler_thread 3529 gc/os_dep.c        GC_darwin_register_mach_handler_thread(mach_thread_self());