nc 0.9.7

Access system calls directly
Documentation
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pub unsafe fn freebsd10__umtx_unlock(umtx: &mut umtx_t) -> Result<(), Errno> {
    let umtx_ptr = umtx as *mut umtx_t as usize;
    syscall1(SYS_FREEBSD10__UMTX_UNLOCK, umtx_ptr).map(drop)
}