pthread_spin_init
int pthread_spin_init(pthread_spinlock_t *, int);
NOFAIL_ERRNO(pthread_spin_init(&rw->spin, PTHREAD_PROCESS_PRIVATE));
if (pthread_spin_init(&part->part_lck, PTHREAD_PROCESS_PRIVATE) == -1) {
pthread_spin_init(&fs->ukfs_spin, PTHREAD_PROCESS_SHARED);