FUTEX_PRIVATE_FLAG
(i & 1) ? FUTEX_PRIVATE_FLAG : 0);
(i & 2) ? FUTEX_PRIVATE_FLAG : 0) == -1);
(i & 1) ? FUTEX_PRIVATE_FLAG : 0);
(i & 2) ? FUTEX_PRIVATE_FLAG : 0) == -1);
#define FT_PRIVATE FUTEX_PRIVATE_FLAG /* Futex is process-private. */
#define FUTEX_WAIT_PRIVATE (FUTEX_WAIT | FUTEX_PRIVATE_FLAG)
#define FUTEX_WAKE_PRIVATE (FUTEX_WAKE | FUTEX_PRIVATE_FLAG)
#define FUTEX_REQUEUE_PRIVATE (FUTEX_REQUEUE | FUTEX_PRIVATE_FLAG)