LOCK_EX 238 src/dps8/shm.c rc = flock(fd, LOCK_EX | LOCK_NB); LOCK_EX 358 src/dps8/shm.c rc = flock(fd, LOCK_EX | LOCK_NB); LOCK_EX 284 src/simh/sim_fio.c rc = flock (fileno(fsc), LOCK_EX | LOCK_NB);