pub const UMTX_OP = enum(c_int) {
    LOCK = 0,
    UNLOCK = 1,
    WAIT = 2,
    WAKE = 3,
    MUTEX_TRYLOCK = 4,
    MUTEX_LOCK = 5,
    MUTEX_UNLOCK = 6,
    SET_CEILING = 7,
    CV_WAIT = 8,
    CV_SIGNAL = 9,
    CV_BROADCAST = 10,
    WAIT_UINT = 11,
    RW_RDLOCK = 12,
    RW_WRLOCK = 13,
    RW_UNLOCK = 14,
    WAIT_UINT_PRIVATE = 15,
    WAKE_PRIVATE = 16,
    MUTEX_WAIT = 17,
    MUTEX_WAKE = 18, // deprecated
    SEM_WAIT = 19, // deprecated
    SEM_WAKE = 20, // deprecated
    NWAKE_PRIVATE = 31,
    MUTEX_WAKE2 = 22,
    SEM2_WAIT = 23,
    SEM2_WAKE = 24,
    SHM = 25,
    ROBUST_LISTS = 26,
}