MADVISE_MMAP_READ_LOCK
madv_behavior->lock_mode != MADVISE_MMAP_READ_LOCK);
madv_behavior->lock_mode = MADVISE_MMAP_READ_LOCK;
return MADVISE_MMAP_READ_LOCK;
case MADVISE_MMAP_READ_LOCK:
case MADVISE_MMAP_READ_LOCK:
case MADVISE_MMAP_READ_LOCK: