WORKER_SIGNAL     838 server/mpm/worker/worker.c     unblock_signal(WORKER_SIGNAL);
WORKER_SIGNAL     839 server/mpm/worker/worker.c     apr_signal(WORKER_SIGNAL, dummy_signal_handler);
WORKER_SIGNAL    1101 server/mpm/worker/worker.c             pthread_kill(*worker_os_thread, WORKER_SIGNAL);