LOCK_EX 228 src/dps8/shm.c rc = flock(fd, LOCK_EX | LOCK_NB); LOCK_EX 348 src/dps8/shm.c rc = flock(fd, LOCK_EX | LOCK_NB); LOCK_EX 290 src/simh/sim_fio.c rc = flock (fileno(fsc), LOCK_EX | LOCK_NB);