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-----------------------------------------------------------------------------
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-- Module : System.CPUTime
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-- Copyright : (c) The University of Glasgow 2001
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-- License : BSD-style (see the file libraries/base/LICENSE)
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-- Maintainer : libraries@haskell.org
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-- Stability : provisional
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-- Portability : portable
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-- The standard CPUTime library.
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-----------------------------------------------------------------------------
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getCPUTime, -- :: IO Integer
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cpuTimePrecision -- :: Integer
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import Hugs.Time ( getCPUTime, clockTicks )
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import CPUTime ( getCPUTime, cpuTimePrecision )
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#ifdef __GLASGOW_HASKELL__
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import Foreign hiding (unsafePerformIO)
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import System.IO.Unsafe (unsafePerformIO)
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#include "HsBaseConfig.h"
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#if !defined(mingw32_HOST_OS) && !defined(irix_HOST_OS)
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# if HAVE_SYS_RESOURCE_H
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# include <sys/resource.h>
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-- For FILETIME etc. on Windows
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#include <sys/times.h>
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#if !defined(mingw32_HOST_OS) && !defined(cygwin32_HOST_OS)
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realToInteger :: Real a => a -> Integer
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realToInteger ct = round (realToFrac ct :: Double)
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-- CTime, CClock, CUShort etc are in Real but not Fractional,
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-- so we must convert to Double before we can round it
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#ifdef __GLASGOW_HASKELL__
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-- -----------------------------------------------------------------------------
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-- |Computation 'getCPUTime' returns the number of picoseconds CPU time
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-- used by the current program. The precision of this result is
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-- implementation-dependent.
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getCPUTime :: IO Integer
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#if !defined(mingw32_HOST_OS) && !defined(cygwin32_HOST_OS)
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-- getrusage() is right royal pain to deal with when targetting multiple
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-- versions of Solaris, since some versions supply it in libc (2.3 and 2.5),
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-- while 2.4 has got it in libucb (I wouldn't be too surprised if it was back
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-- again in libucb in 2.6..)
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-- Avoid the problem by resorting to times() instead.
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#if defined(HAVE_GETRUSAGE) && ! irix_HOST_OS && ! solaris2_HOST_OS
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allocaBytes (#const sizeof(struct rusage)) $ \ p_rusage -> do
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throwErrnoIfMinus1_ "getrusage" $ getrusage (#const RUSAGE_SELF) p_rusage
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let ru_utime = (#ptr struct rusage, ru_utime) p_rusage
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let ru_stime = (#ptr struct rusage, ru_stime) p_rusage
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u_sec <- (#peek struct timeval,tv_sec) ru_utime :: IO CTime
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u_usec <- (#peek struct timeval,tv_usec) ru_utime :: IO CTime
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s_sec <- (#peek struct timeval,tv_sec) ru_stime :: IO CTime
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s_usec <- (#peek struct timeval,tv_usec) ru_stime :: IO CTime
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return ((realToInteger u_sec * 1000000 + realToInteger u_usec +
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realToInteger s_sec * 1000000 + realToInteger s_usec)
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foreign import ccall unsafe getrusage :: CInt -> Ptr CRUsage -> IO CInt
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# if defined(HAVE_TIMES)
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allocaBytes (#const sizeof(struct tms)) $ \ p_tms -> do
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u_ticks <- (#peek struct tms,tms_utime) p_tms :: IO CClock
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s_ticks <- (#peek struct tms,tms_stime) p_tms :: IO CClock
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return (( (realToInteger u_ticks + realToInteger s_ticks) * 1000000000000)
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`div` fromIntegral clockTicks)
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foreign import ccall unsafe times :: Ptr CTms -> IO CClock
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ioException (IOError Nothing UnsupportedOperation
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-- NOTE: GetProcessTimes() is only supported on NT-based OSes.
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-- The counts reported by GetProcessTimes() are in 100-ns (10^-7) units.
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allocaBytes (#const sizeof(FILETIME)) $ \ p_creationTime -> do
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allocaBytes (#const sizeof(FILETIME)) $ \ p_exitTime -> do
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allocaBytes (#const sizeof(FILETIME)) $ \ p_kernelTime -> do
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allocaBytes (#const sizeof(FILETIME)) $ \ p_userTime -> do
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pid <- getCurrentProcess
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ok <- getProcessTimes pid p_creationTime p_exitTime p_kernelTime p_userTime
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ut <- ft2psecs p_userTime
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kt <- ft2psecs p_kernelTime
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ft2psecs :: Ptr FILETIME -> IO Integer
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high <- (#peek FILETIME,dwHighDateTime) ft :: IO Word32
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low <- (#peek FILETIME,dwLowDateTime) ft :: IO Word32
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-- Convert 100-ns units to picosecs (10^-12)
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-- => multiply by 10^5.
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return (((fromIntegral high) * (2^(32::Int)) + (fromIntegral low)) * 100000)
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-- ToDo: pin down elapsed times to just the OS thread(s) that
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-- are evaluating/managing Haskell code.
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-- need proper Haskell names (initial lower-case character)
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foreign import stdcall unsafe "GetCurrentProcess" getCurrentProcess :: IO (Ptr HANDLE)
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foreign import stdcall unsafe "GetProcessTimes" getProcessTimes :: Ptr HANDLE -> Ptr FILETIME -> Ptr FILETIME -> Ptr FILETIME -> Ptr FILETIME -> IO CInt
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#endif /* not _WIN32 */
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#endif /* __GLASGOW_HASKELL__ */
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-- |The 'cpuTimePrecision' constant is the smallest measurable difference
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-- in CPU time that the implementation can record, and is given as an
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-- integral number of picoseconds.
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cpuTimePrecision :: Integer
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cpuTimePrecision = round ((1000000000000::Integer) % fromIntegral (clockTicks))
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#ifdef __GLASGOW_HASKELL__
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unsafePerformIO (sysconf (#const _SC_CLK_TCK) >>= return . fromIntegral)
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foreign import ccall unsafe sysconf :: CInt -> IO CLong
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#endif /* __GLASGOW_HASKELL__ */