module System.CPUTime.Posix.RUsage
( getCPUTime
, getCpuTimePrecision
) where
import Data.Ratio
import Foreign
import Foreign.C
import System.CPUTime.Utils
getCPUTime :: IO Integer
getCPUTime = allocaBytes (144) $ \ p_rusage -> do
throwErrnoIfMinus1_ "getrusage" $ getrusage (0) p_rusage
let ru_utime = ((\hsc_ptr -> hsc_ptr `plusPtr` 0)) p_rusage
let ru_stime = ((\hsc_ptr -> hsc_ptr `plusPtr` 16)) p_rusage
u_sec <- ((\hsc_ptr -> peekByteOff hsc_ptr 0)) ru_utime :: IO CTime
u_usec <- ((\hsc_ptr -> peekByteOff hsc_ptr 8)) ru_utime :: IO CSUSeconds
s_sec <- ((\hsc_ptr -> peekByteOff hsc_ptr 0)) ru_stime :: IO CTime
s_usec <- ((\hsc_ptr -> peekByteOff hsc_ptr 8)) ru_stime :: IO CSUSeconds
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 =
return $ round ((1e12::Integer) % fromIntegral clk_tck)
foreign import ccall unsafe clk_tck :: CLong