nc 0.9.8

Access system calls directly
Documentation
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pub unsafe fn freebsd10__umtx_lock(umtx: &mut umtx_t) -> Result<(), Errno> {
    let umtx_ptr = core::ptr::from_mut(umtx) as usize;
    unsafe { syscall1(SYS_FREEBSD10__UMTX_LOCK, umtx_ptr).map(drop) }
}