LOCK_EX 255 src/dps8/shm.c rc = flock(fd, LOCK_EX | LOCK_NB); LOCK_EX 417 src/dps8/shm.c rc = flock(fd, LOCK_EX | LOCK_NB); LOCK_EX 282 src/simh/sim_fio.c rc = flock (fileno(fsc), LOCK_EX | LOCK_NB);