    {-# LINE 1 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}
    {-# LANGUAGE CPP, CApiFFI, NumDecimals #-}

    module System.CPUTime.Posix.RUsage
        ( getCPUTime
        , getCpuTimePrecision
        ) where

    import Data.Ratio
    import Foreign
    import Foreign.C
    import System.CPUTime.Utils

    -- For struct rusage

    {-# LINE 18 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}

    {-# LINE 20 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}

    {-# LINE 22 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}

    getCPUTime :: IO Integer
    getCPUTime :: IO Integer
    getCPUTime = Int -> (Ptr CRUsage -> IO Integer) -> IO Integer
    forall a b. Int -> (Ptr a -> IO b) -> IO b
    allocaBytes (Int
    144) ((Ptr CRUsage -> IO Integer) -> IO Integer)
    -> (Ptr CRUsage -> IO Integer) -> IO Integer
    forall a b. (a -> b) -> a -> b
    $ \ Ptr CRUsage
    p_rusage -> do
    {-# LINE 25 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}
        throwErrnoIfMinus1_ "getrusage" $ getrusage (0) p_rusage
    {-# LINE 26 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}

        let ru_utime = ((\hsc_ptr -> hsc_ptr `plusPtr` 0)) p_rusage
    {-# LINE 28 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}
        let ru_stime = ((\hsc_ptr -> hsc_ptr `plusPtr` 16)) p_rusage
    {-# LINE 29 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}
        u_sec  <- ((\hsc_ptr -> peekByteOff hsc_ptr 0))  ru_utime :: IO CTime
    {-# LINE 30 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}
        u_usec <- ((\hsc_ptr -> peekByteOff hsc_ptr 8)) ru_utime :: IO CSUSeconds
    {-# LINE 31 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}
        s_sec  <- ((\hsc_ptr -> peekByteOff hsc_ptr 0))  ru_stime :: IO CTime
    {-# LINE 32 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}
        s_usec <- ((\hsc_ptr -> peekByteOff hsc_ptr 8)) ru_stime :: IO CSUSeconds
    {-# LINE 33 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}
        let usec = cTimeToInteger u_sec * 1e6 + csuSecondsToInteger u_usec +
                   cTimeToInteger s_sec * 1e6 + csuSecondsToInteger s_usec
        return (usec * 1e6)

    type CRUsage = ()
    foreign import capi unsafe "HsBase.h getrusage" getrusage :: CInt -> Ptr CRUsage -> IO CInt

    getCpuTimePrecision :: IO Integer
    getCpuTimePrecision :: IO Integer
    getCpuTimePrecision =
        Integer -> IO Integer
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Integer -> IO Integer) -> Integer -> IO Integer
    forall a b. (a -> b) -> a -> b
    $ Ratio Integer -> Integer
    forall b. Integral b => Ratio Integer -> b
    forall a b. (RealFrac a, Integral b) => a -> b
    round ((Integer
    1e12::Integer) Integer -> Integer -> Ratio Integer
    forall a. Integral a => a -> a -> Ratio a
    % CLong -> Integer
    forall a b. (Integral a, Num b) => a -> b
    fromIntegral CLong
    clk_tck)

    foreign import ccall unsafe clk_tck :: CLong

    {-# LINE 55 "libraries/base/System/CPUTime/Posix/RUsage.hsc" #-}