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    //! Helper module which helps to determine amount of threads to be used
    //! during tests execution.
    use std::env;

    #[allow(deprecated)]
    pub fn get_concurrency() -> usize {
        return match env::var("RUST_TEST_THREADS") {
            Ok(s) => {
                let opt_n: Option<usize> = s.parse().ok();
                match opt_n {
                    Some(n) if n > 0 => n,
                    _ => panic!("RUST_TEST_THREADS is `{}`, should be a positive integer.", s),
                }
            }
            Err(..) => num_cpus(),
        };

        #[cfg(windows)]
        #[allow(nonstandard_style)]
        fn num_cpus() -> usize {
            #[repr(C)]
            struct SYSTEM_INFO {
                wProcessorArchitecture: u16,
                wReserved: u16,
                dwPageSize: u32,
                lpMinimumApplicationAddress: *mut u8,
                lpMaximumApplicationAddress: *mut u8,
                dwActiveProcessorMask: *mut u8,
                dwNumberOfProcessors: u32,
                dwProcessorType: u32,
                dwAllocationGranularity: u32,
                wProcessorLevel: u16,
                wProcessorRevision: u16,
            }
            extern "system" {
                fn GetSystemInfo(info: *mut SYSTEM_INFO) -> i32;
            }
            unsafe {
                let mut sysinfo = std::mem::zeroed();
                GetSystemInfo(&mut sysinfo);
                sysinfo.dwNumberOfProcessors as usize
            }
        }

        #[cfg(target_os = "vxworks")]
        fn num_cpus() -> usize {
            // FIXME: Implement num_cpus on vxWorks
            1
        }

        #[cfg(target_os = "redox")]
        fn num_cpus() -> usize {
            // FIXME: Implement num_cpus on Redox
            1
        }

        #[cfg(target_os = "hermit")]
        fn num_cpus() -> usize {
            // FIXME: Implement num_cpus on HermitCore
            1
        }

        #[cfg(any(
            all(target_arch = "wasm32", not(target_os = "emscripten")),
            all(target_vendor = "fortanix", target_env = "sgx")
        ))]
        fn num_cpus() -> usize {
            1
        }

        #[cfg(any(
            target_os = "android",
            target_os = "cloudabi",
            target_os = "emscripten",
            target_os = "fuchsia",
            target_os = "ios",
            target_os = "linux",
            target_os = "macos",
            target_os = "solaris",
        ))]
        fn num_cpus() -> usize {
            unsafe { libc::sysconf(libc::_SC_NPROCESSORS_ONLN) as usize }
        }

        #[cfg(any(target_os = "freebsd", target_os = "dragonfly", target_os = "netbsd"))]
        fn num_cpus() -> usize {
            use std::ptr;

            let mut cpus: libc::c_uint = 0;
            let mut cpus_size = std::mem::size_of_val(&cpus);

            unsafe {
                cpus = libc::sysconf(libc::_SC_NPROCESSORS_ONLN) as libc::c_uint;
            }
            if cpus < 1 {
                let mut mib = [libc::CTL_HW, libc::HW_NCPU, 0, 0];
                unsafe {
                    libc::sysctl(
                        mib.as_mut_ptr(),
                        2,
                        &mut cpus as *mut _ as *mut _,
                        &mut cpus_size as *mut _ as *mut _,
                        ptr::null_mut(),
                        0,
                    );
                }
                if cpus < 1 {
                    cpus = 1;
                }
            }
            cpus as usize
        }

        #[cfg(target_os = "openbsd")]
        fn num_cpus() -> usize {
            use std::ptr;

            let mut cpus: libc::c_uint = 0;
            let mut cpus_size = std::mem::size_of_val(&cpus);
            let mut mib = [libc::CTL_HW, libc::HW_NCPU, 0, 0];

            unsafe {
                libc::sysctl(
                    mib.as_mut_ptr(),
                    2,
                    &mut cpus as *mut _ as *mut _,
                    &mut cpus_size as *mut _ as *mut _,
                    ptr::null_mut(),
                    0,
                );
            }
            if cpus < 1 {
                cpus = 1;
            }
            cpus as usize
        }

        #[cfg(target_os = "haiku")]
        fn num_cpus() -> usize {
            // FIXME: implement
            1
        }

        #[cfg(target_os = "l4re")]
        fn num_cpus() -> usize {
            // FIXME: implement
            1
        }
    }